Surgical orthodontics ii /certified fixed orthodontic courses by Indian dental academy

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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.

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Surgical orthodontics ii /certified fixed orthodontic courses by Indian dental academy

  1. 1. Surgical Orthodontics II INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  2. 2. Surgical Orthodontics II Maxillary Surgery www.indiandentalacademy.com
  3. 3. Introduction  Surgery to the maxilla is carried out at three levels named after a French Surgeon René Le Fort.  The Le Fort I osteotomy involves separating the maxilla and the palate from the skull above the roots of the upper teeth through an incision inside the upper lip. www.indiandentalacademy.com
  4. 4. LeFort I Osteotomy  Proceeding from the lateral nasal wall across the anterior maxillary wall and through the posterior-lateral maxillary wall horizontal maxillary osteotomy is completed. Separation of the nasal septum and vomer from the maxillary crest is carried out with a septal osteotome directed downward and posteriorly. www.indiandentalacademy.com
  5. 5. LeFort I Osteotomy  Finally, a curved osteotome is used to separate the pterygoid plate from the maxillary tuberosity. Pterygopalatine dysjunction osteotome is positioned parallel to the occlusal plane and below the maxillary osteotomy to avoid injuring the internal maxillary artery. www.indiandentalacademy.com
  6. 6. LeFort II Osteotomy www.indiandentalacademy.com
  7. 7. LeFort III Osteotomy www.indiandentalacademy.com
  8. 8. Maxillary Anteroposterior Deficiency  Maxillary anteroposterior deficiency has often been misdiagnosed as mandibular anteroposterior excess because of the similarity in appearance. Therefore, the clinician must carefully distinguish between the two deformities. In the majority of Class III cases, the deformity is due to a combination of the two. As many as 75% of Class III patients have some degree of maxillary skeletal deficiency. If there is any doubt about which jaw should undergo surgery, the maxilla should be advanced. www.indiandentalacademy.com
  9. 9. Profile view     Sunken cheeks Chin and lower lip in balance with nose Sunken or flat appearance of upper lip. Upper lip length reduced and vermillion thin. Frequently, an acute nasolabial angle with the Columella of the nose oriented more horizontally www.indiandentalacademy.com
  10. 10. Frontal view  Flat and relatively short upper lip Often narrow alar base.  Often, sclera seen inferiorly of the iris of the eye.  Sunken cheeks .  Normal to deficient maxillary tooth-to-lip relationship  Less vermillion of the upper lip showing.  Paranasal flattening www.indiandentalacademy.com
  11. 11. Dental characteristics  Class III malocclusion .Often, crowding in the maxillary arch  Normal inclination of mandibular incisors in comparison with the lingual inclination seen in mandibular anteroposterior excess .  Tendency of the maxillary arch to be narrow and often in lingual crossbite with the mandibular arch. www.indiandentalacademy.com
  12. 12. Treatment Presurgical orthodontics The treatment of maxillary anteroposterior deficiency has the same basic goals as does the treatment of mandibular anteroposterior excess: 1. Eliminate compensations. 2. Establish ideal incisor position (indicated by the orthodontic visual treatment objective). 3. Establish arch compatibility, 4. level and align arches. www.indiandentalacademy.com
  13. 13.  It is important to keep in mind that the transverse discrepancy that often accompanies the maxillary anteroposterior deficiency may have to be corrected by surgical expansion of the maxilla. If this is contemplated, the arch should be aligned accordingly and the roots of the teeth next to the interdental osteotomy deviated. www.indiandentalacademy.com
  14. 14.  Two-jaw surgery may be indicated in severe Class III cases. Here the orthodontist should adopt the "two-patient" concept, in which the mandibular and maxillary arches are treated independently, almost as if they belong to two different patients. www.indiandentalacademy.com
  15. 15.  The objective is to align the maxillary and mandibular incisors in both vertical and anteroposterior planes of space so the surgeon can achieve optimal skeletal and esthetic correction without the limitations of dental interference. www.indiandentalacademy.com
  16. 16. Maxillary advancement and Mandibular set back www.indiandentalacademy.com
  17. 17.  Cases of maxillary deficiency often involve crowding in the maxilla, and retraction of incisors is indicated.  The most common extraction pattern in Class III cases is extraction of maxillary first premolars and, when extraction in both arches is indicated, extraction of maxillary first premolars and mandibular second premolars. www.indiandentalacademy.com
  18. 18. Surgical treatment  The maxilla is advanced by means of a Le Fort I osteotomy. This versatile procedure enables the surgeon to correct discrepancies in the vertical, transverse, and occlusal planes. Grafting is recommended both in cases with large advancements and cases with expansion of the palate. www.indiandentalacademy.com
  19. 19.  Various grafting materials are available, including bone harvested from local or distant sites, including the chin or iliac crest; allogenic freezedried bone; and artificial bone substitutes such hydroxyapatite blocks. www.indiandentalacademy.com
  20. 20. Soft tissue changes  Undesirable soft tissue changes may occur, including widening of the alar base, tipping up of the tip of the nose, thinning and lateral retraction of the lip, accentuation of the nasolabial groove, reduced vermilion exposure, and an increase in the nasolabial angle. The patient should be informed about expected soft tissue changes. These changes, however, can be controlled. www.indiandentalacademy.com
  21. 21. Postsurgical orthodontics  Postsurgical orthodontic treatment is very similar to that of mandibular setback cases. A splint is used only when a multi piece Le Fort I maxillary osteotomy is performed. In two-jaw surgery, an intermediate splint is always used to accurately position the maxilla. The patient would be able to function with the occlusal splint until adequate healing has taken place and active orthodontics can be resumed. www.indiandentalacademy.com
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  26. 26. LeFort I maxillary advancement: 3-year stability and risk factors for relapse. Dowling PA, Espeland L, Sandvik L, Mobarak KA, Hogevold HE(AJODO Nov2005) The objectives of this retrospective cephalometric study were to assess the amount, direction, and timing of postoperative changes after LeFort I maxillary advancement, and to identify risk factors for skeletal relapse.  The material was selected from the files at the Department of Orthodontics, University of Oslo, and comprised 43 patients who underwent 1piece LeFort I advancement as the only surgical procedure from 1990 to 1998.  www.indiandentalacademy.com
  27. 27.  All patients were followed for 3 years by using a strict data collection protocol. Lateral cephalograms were obtained before surgery and at 5 times after surgery. www.indiandentalacademy.com
  28. 28.  RESULTS: A mean relapse of 18% of the surgical advancement occurred. In 14% of the patients, clinically significant skeletal relapse (> or = 2 mm) was observed.  Most (89%) postoperative change occurred during the first 6 months after surgery. Skeletal relapse increased significantly with degree of surgical advancement (P = .001) and degree of inferior repositioning of the anterior maxilla (P = .004) (linear regression analysis). At the end of follow-up, overjet and overbite were within clinically acceptable ranges for all patients. www.indiandentalacademy.com
  29. 29.  CONCLUSIONS: Maxillary advancement with a 1-piece LeFort I osteotomy is a relatively stable procedure. Identified risk factors for horizontal relapse were degree of surgical advancement and degree of inferior repositioning of anterior maxilla. www.indiandentalacademy.com
  30. 30. Maxillary Anteroposterior Excess  Maxillary anteroposterior excess is certainly not as common as was implied when Class II malocclusions were classified strictly according to the Angle dental classification. According to McNamara (1981), only approximately 10% of a group of 277 patients with Class I malocclusions had true maxillary anteroposterior excess. www.indiandentalacademy.com
  31. 31. Profile view  General protrusion of the middle third of the face.  Nose that often appears large and has a dorsal hump.  Prominent infraorbital rims and cheekbones. www.indiandentalacademy.com
  32. 32.  Upper lip often short and everted.  Deep labiomental sulcus due to the fact that the lower lip curls under the maxillary incisors.  Lip incompetence.  Acute nasolabial angle www.indiandentalacademy.com
  33. 33. Frontal view  Noticeable prominence of the middle third of the face .  Often, a long lower facial height .  Short, curled upper lip .  Curled lower lip under maxillary incisors www.indiandentalacademy.com
  34. 34. Dental characteristics .  Tendency toward an open bite .  Tendency toward a narrow, constricted maxillary arch .  High, arched palatal vault www.indiandentalacademy.com
  35. 35.  In the growing child, orthodontic correction is certainly most effective. It usually involves the use of headgear and multibanded fixed appliance therapy. Depending on the severity and crowding, it also may involve the extraction of four premolars.  In the nongrowing patient, surgery that sets back the total maxilla or anterior maxillary segment hastens treatment and avoids headgear therapy. Total maxillary setback is performed at the Le Fort I level. www.indiandentalacademy.com
  36. 36. Surgical treatment  Three surgical techniques for repositioning the anterior maxilla have been described by Wassmund (1935), Cupar (1954), and Wunderer (1963). When posterior movement of the anterior maxillary segment is the main objective, the technique described by Wunderer is the most practical approach. www.indiandentalacademy.com
  37. 37.  An anterior segmental osteotomy of the maxilla is often performed as part of a multisegment Le Fort I procedure because patients who need anterior maxillary correction often need additional corrections to the maxilla (eg, superior repositioning and/or expansion of the posterior maxilla). www.indiandentalacademy.com
  38. 38. In the presurgical phase, the roots of the teeth on either side of the osteotomy cut must be deviated sufficiently. Inadequate deviation of the roots of these teeth will: 1. Limit the surgical setback 2. Increase the risk of damage to the tooth roots at surgery 3. Force the surgeon to rotate the segment, thereby either elevating' the canines out of occlusion or tipping the incisors inferiorly www.indiandentalacademy.com
  39. 39. www.indiandentalacademy.com
  40. 40.  Adequate deviation of the roots allows setback of the anterior maxillary segment, A small area of interproximal bone should be maintained and the crowns of the teeth not forced together. www.indiandentalacademy.com
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  46. 46. Maxillary Vertical Deficiency  Maxillary vertical deficiency is very often associated with maxillary anteroposterior deficiency in which the maxilla did not develop in a forward and downward direction. It is common in patients with cleft lip and cleft palate, where early surgery often curtails normal development of the maxilla. www.indiandentalacademy.com
  47. 47.  Because overclosure of the mandible makes patients with maxillary vertical deficiency appear clinically similar to those with mandibular anteroposterior excess, the clinician should differentiate between the two. www.indiandentalacademy.com
  48. 48. Profile view  The lower and middle thirds of the face are proportionally reduced in height when the patient's teeth are in occlusion.  The nasolabial angle is acute. www.indiandentalacademy.com
  49. 49.  Overclosure causes the chin to appear excessive.  The profile improves when the mandible is in the rest position.  The maxillary incisors are not visible under the upper lip. www.indiandentalacademy.com
  50. 50. www.indiandentalacademy.com
  51. 51. Frontal view  The face appears short and square, with strong, exaggerated masseter muscles.  The maxillary incisors are often not visible with the mouth open, creating an edentulous appearance,and the incisors are only partially exposed when the patient smiles. www.indiandentalacademy.com
  52. 52.  When the mandible is closed, the corners of the mouth are turned down, and skin folds are apparent lateral to the oral commissure.  Nasal base may be broad and the nostrils large.  Mandible appears excessive. www.indiandentalacademy.com
  53. 53. Dental characteristics  The heavy musculature and overclosed occlusion frequently predispose the patient bruxism and resulting attrition.  Interocclusal freeway space is often increased.  There is a Class III dental relationship. www.indiandentalacademy.com
  54. 54. Differential diagnosis www.indiandentalacademy.com
  55. 55. Treatment  The surgical treatment objective in cases of maxillary vertical deficiency is to reposition the maxilla forward and downward. The mandible will rotate clockwise, and the vertical height of the face will increase. Patients with maxillary vertical deficiency invariably have an increased interocclusal freeway space, which should be carefully evaluated. The increase in vertical height achieved by downgrafting the maxilla should be less than the "available" interocclusal freeway space www.indiandentalacademy.com
  56. 56.  The extent of the vertical deficiency can be measured only with the patient's lips in repose and almost touching. Pretreatment cephalometric radiographs should be taken with the mandible in the rest position and the lips barely touching. This can be facilitated by the use of a wax splint. The cephalometric visual treatment objective should be created on a radiograph taken with the mandible rotated open and the lips barely apart. www.indiandentalacademy.com
  57. 57.  This radiograph will give the surgeon a good indication of (1) the required amount of maxillary downgrafting to achieve an ideal lip-tooth relationship and (2) the mandibular anteroposterior position following clockwise rotation. www.indiandentalacademy.com
  58. 58.  Where larger maxillary advancement is needed in cases with crowding, the first maxillary premolars and second mandibular premolars are extracted to create a large crossbite. www.indiandentalacademy.com
  59. 59.  If a transverse deficiency of the maxilla is present, it is best to correct it surgically. The maxillary arch can often be coordinated in two halves to "fit" the mandibular arch and the archwire cut in the center. A stabilizing palatal arch should be placed as soon as possible after surgery. www.indiandentalacademy.com
  60. 60. Surgical Treatment  The maxilla can be repositioned inferiorly by a Le Fort I downgrafting procedure. This procedure was unstable in the past, and as high as a 70% loss of vertical height has been reported. However, rigid fixation has substantially improved the stability of the procedure. Definitive presurgical planning of the exact amount of maxillary inferior repositioning is critical. The clinician should be guided by both the amount of interocclusal rest space and the maxillary incisor-upper lip relationship. www.indiandentalacademy.com
  61. 61.  After the maxilla is mobilized on the Le FortI level, intermaxillary fixation is placed. The condyles are seated in the glenoid fossae, and with gentle backward and upward pressure at the mandibular angles, the maxilla is rotated closed until the desired, preplanned interosseous distance is achieved. Four bone plates-two at the zygomatic buttresses and two at the piriform rims-are placed. www.indiandentalacademy.com
  62. 62.  Patients with a combination of vertical and anteroposterior deficiency may be candidates for the Le Fort I downsliding osteotomy design.  The surgical plan for these patients should include maxillary advancement in addition to correction of the vertical discrepancy. In these cases, the osteotomy is angled to provide an inclined plane that will increase the vertical dimension as the maxilla slides forward. www.indiandentalacademy.com
  63. 63.  The horizontal length from the piriform rim to the lateral aspect of the zygoma is measured on a lateral cephalogram. This measurement is used to calculate the downward angulation of the osteotomy and the position of the vertical steps. www.indiandentalacademy.com
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  69. 69. The long-term stability of LeFort I maxillary downgrafts with rigid fixation to correct vertical maxillary deficiency  Marianne. Perez, Glenn T. Sameshima, and Peter M. Sinclair  This study evaluated the long-term stability of LeFort I maxillary downgrafts with rigid fixation in 28 patients with vertical maxillary deficiency. Preorthodontic, presurgical, immediate postsurgical, and an average of 16 months postsurgical cephalometric radiographs were evaluated. www.indiandentalacademy.com
  70. 70.  The results indicated that overall vertical maxillary stability after downgraft was good with 80%of the cases showing superior relapse of 2 mm or less. The mean amount of postoperative relapse represented 28% of the surgical downgraft. No correlation was found between the amount of the maxillary downgraft and the subsequent postsurgical vertical stability of the maxilla. No difference was found in the vertical stability of the maxilla comparing one-jaw and two-jaw procedures www.indiandentalacademy.com
  71. 71.  It was also found that there was no difference in the vertical stability of the maxilla between single-segment and multiple-segment maxillary procedures, and also when comparing standard and high LeFort I osteotomy techniques. In addition, occlusal plane rotation of surgery, as well as the type of presurgical orthodontic movement, were both found to have no influence on postoperative stability of the maxilla. www.indiandentalacademy.com
  72. 72. Maxillary Vertical Excess  Approximately 30% of patients seeking treatment have a vertical increase in the lower third of the face. The main complaints of patients with vertical maxillary excess are a gummy smile and/or functional problems due to the anterior open bite, the hallmarks of Long face deformity. www.indiandentalacademy.com
  73. 73. Profile view  Increased total facial height due to an increased lower facial height.  Mandible rotated downward and backward  Increased interlabial distance (greater than 4mm) www.indiandentalacademy.com
  74. 74.  Increased maxillary incisor exposure (except in some open bite cases).  Sunken cheeks.  Often, a welldeveloped, almost excessive, curled lower lip. www.indiandentalacademy.com
  75. 75. Frontal view  Narrow alar base width.  Excessive maxillary incisor exposure (except in some open bite cases).  Increased interlabial distance. www.indiandentalacademy.com
  76. 76.  Often, increased vermillion exposure of the lower lip.  Increased lower-third facial heigh.  Gummy smile.  Depressed paranasal areas with a tendency to flat cheeks www.indiandentalacademy.com
  77. 77. Dental characteristics. Often, an anterior bite High, arched palate with a large distance between the root apices and the nasal floor. V-shaped maxilla and teeth often in palatal crossbite. Mandibular incisors that tend to become more upright and therefore more crowded. www.indiandentalacademy.com
  78. 78. Differential diagnosis www.indiandentalacademy.com
  79. 79. Differential diagnosis www.indiandentalacademy.com
  80. 80.  Because of the excessive vertical growth of the maxilla, the mandible tends to rotate downward and backward. These patients, therefore, often also have problems in the anteroposterior plane.  Patients with long faces can be described as being skeletal Class I rotated to Class II or as Class III rotated to Class I. www.indiandentalacademy.com
  81. 81.  It can be concluded that excessive vertical growth of the maxilla will make mandibular anteroposterior deficiencies appear worse and mandibular anteroposterior excesses appear better. Frequently there is an accentuated curve of Spee due to overeruption of mandibular incisors, especially in cases without open bites. www.indiandentalacademy.com
  82. 82.  There is a tendency for anterior open bites in two thirds of these patients. The clinician should note that some diagnostic characteristics may be camouflaged in patients with vertical maxillary excess and deep bites. www.indiandentalacademy.com
  83. 83.  First, because of the deep bite, the lower facial height may not be increased. Second, the maxillary incisors may be excessively exposed under the upper lip; however, this exposure is covered by lower lip. www.indiandentalacademy.com
  84. 84.  The vertical height of the maxilla cannot be assessed because of the overclosed bite. The vertical excess (excessive tooth exposure under the upper lip) is evident when the mandible is rotated into the correct interincisal overbite. Vertical excess is disguised by the deep bite. www.indiandentalacademy.com
  85. 85.  The combination of three main characteristics may be considered diagnostic for vertical maxillary excess: 1. Increased mandibular plane angle 2. Increased total anterior facial height 3. Decreased percentage contribution of upper facial height to total facial height www.indiandentalacademy.com
  86. 86. Treatment  The two most important rules in the treatment of vertical maxillary excess follow: 1. Never treat the smile. 2. Always plan the treatment with the lips in repose. www.indiandentalacademy.com
  87. 87.  There is no alternative to surgery for adult patients with vertical maxillary excess. Attempts to close the open bite by orthodontic extrusion of anterior teeth or intrusion of posterior teeth are not a solution, for two reasons: (1) relapse into open bite almost always occurs, and (2) extrusion of the maxillary incisors will worsen the esthetics. www.indiandentalacademy.com
  88. 88.  It is preferable to level the mandibular arch before surgery (in contrast to the approach in patients with short faces).  Patients with vertical maxillary excess and severe open bites often have an excessive reverse curve in the maxillary arch. In these cases it is advantageous to level the arch in segments and deviate the roots of teeth to allow interdental osteotomies. Therefore, level within the segments. Do not attempt to close the open bite; rather, open the bite further. www.indiandentalacademy.com
  89. 89.  A similar principle applies in the decision to expand a narrow maxilla orthodontically. The teeth should not be expanded beyond their bony base. Any relapse of an expanded maxillary arch will tend to open the bite anteriorly.  Surgical expansion is recommended, especially in more severely narrowed maxillae and in older patients. www.indiandentalacademy.com
  90. 90.  Teeth adjacent to the proposed interdental osteotomies (eg, between maxillary canines and premolars or between maxillary lateral incisors and canines) are bonded with brackets that will "diverge" the roots away from the surgical site to prevent accidental surgical insult to the roots. For example, a maxillary left canine bracket is placed on the right canine and vice versa. www.indiandentalacademy.com
  91. 91.  Leveling is accomplished using sectional Nitinol wires or similar wires. Stabilization is then undertaken with sectional finishing archwires bent to conform to the arch form for each segment. www.indiandentalacademy.com
  92. 92.  If no vertical segmental discrepancies exist, the maxillary arch is leveled with a continous archwire, taking care that the maxillary incisors do not level forward; nightly headgear use may be required. www.indiandentalacademy.com
  93. 93.  Intrusive posterior mechanics, such palatal bars or high-pull headgear, should be avoided.  Mandibular molars should be brought upright to encourage bite opening. This will accentuate the vertical problem and introduce less chance of relapse. www.indiandentalacademy.com
  94. 94. Surgical treatment  To correct the vertical discrepancy, the maxilla must be superiorly repositioned by a Le Fort I osteotomy. Two critical elements must be considered in the final treatment planning: 1. How far must the maxilla be superiorly repositioned? 2. After straight vertical repositioning of the maxilla, where will the mandible be? www.indiandentalacademy.com
  95. 95.  Extent of superior repositioning: The amount of superior repositioning is critical, because moving the maxilla too far superiorly is more detrimental to facial esthetics than leaving the vertical excess uncorrected.  Consider the following points when planning superior repositioning of the maxille: 1. Patients with short upper lips show more teeth than patients with long upper lips. www.indiandentalacademy.com
  96. 96. 2. Younger patients tolerate (esthetically and psychologically) more upward movement of the maxilla than do older patients. Remember that the upper lip will lengthen with age. 3. Exposure of 30% to 40% of the clinical crowns of the maxillary incisors beneath the upper lip is esthetically pleasing. 4. During superior repositioning of the maxilla the upper lip will shorten. www.indiandentalacademy.com
  97. 97. 5. Plan, in general, for a 4-mm tooth exposure after surgery. 6. It is not mandatory to elevate the maxilla until the lips make contact. A few millimeters of lip incompetence is acceptable and, in many cases, attractive. 7. Large movements, if not controlled, may lead to widening of the alar base of the nose and tipping up of the nasal tip. Because both effects are controllable, take them into consideration in treatment planning and surgical technique. www.indiandentalacademy.com
  98. 98. 8. Moving the maxilla too far superiorly gives poor esthetic results, but moving it posteriorly at the same time yields even worse results. 9. Consider the upper lip shape. Patients with an extreme Cupid's bow may only have excessive exposure of the two central incisors. If surgery is planned using the lateral cephalometric radiograph without considering the lip shape, treatment may result in only the tips of the two central incisors being visible under the upper lip. www.indiandentalacademy.com
  99. 99.  Anteroposterior position of the mandible. The mandible will autorotate counterclockwise around a point at the condyle. As a consequence, the mandibular incisors will rotate forward (more so in high-angle cases than in low angle cases). When the extent of maxillary superior repositioning has been decided, the anteroposterior position of the mandibular incisor should be considered. It may be necessary to advance the maxilla slightly to achieve a Class I malocclusion. www.indiandentalacademy.com
  100. 100.  If the mandible is anteroposteriorly deficient, a maxillary setback may be considered to achieve a Class I malocclusion  In Class III cases, the Class III dental relationship will worsen as the mandible is autorotated, necessitating either maxillary advancement or mandibular setback. www.indiandentalacademy.com
  101. 101.  It is often necessary to surgically expand the posterior maxilla through parasagittal osteotomies in the palate, A bone graft or hydroxyapatite blocks should be grafted into the defect and the segments stabilized by a splint with a palatal bar. Grafting should be used for any expansions greater than 3mm. www.indiandentalacademy.com
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  106. 106. The predictability of maxillary repositioning in LeFort I orthognathic surgery.  Jacobson R, Sarver DM AJODO 2002  The purpose of this retrospective study was to evaluate the surgical accuracy of maxillary repositioning by comparing the objectives obtained from cephalometric prediction tracings with the actual skeletal changes achieved during maxillary and maxillomandibular procedures. The sample consisted of 46 patients from the files of 1 orthodontist. www.indiandentalacademy.com
  107. 107.  Presurgical and immediately postsurgical cephalometric radiographs were digitized, and the original surgical prediction was reproduced with Dentofacial Planner (Dentofacial Software, Toronto, Ontario, Canada) software.  Vertical and horizontal measurements to several skeletal landmarks were used to assess the differences between the predicted maxillary position and the actual maxillary postsurgical position. Statistical differences were found for some measurements, particularly those related to the vertical placement of the posterior maxilla. www.indiandentalacademy.com
  108. 108.  Significant differences were also found when evaluating surgical complexity (single-jaw vs bimaxillary procedures) and the direction of movement (impaction vs advancement) in direction only. www.indiandentalacademy.com
  109. 109.  To assess the overall fit of individual predictions, authors calculated an average discrepancy for each patient; 80% of the actual results fell within 2 mm of the prediction, and 43% fell within 1 mm of the prediction. www.indiandentalacademy.com
  110. 110. Surgically assisted palatal expansion  Surgically assisted palatal expansion is a form of distraction osteogenesis. This form of expansion is recommended in patients younger than 25 years who would not require any other orthognathic surgical procedures. The surgical technique involves reducing the skeletal resistance to orthodontic expansion by performing osteotomies at the lateral maxillary buttress and/or in the palate. www.indiandentalacademy.com
  111. 111.  Surgically assisted expansion is not recommended in patients older than 30 years because of the increased interdigitation of the remaining suture lines. The expansion appliance should remain in place at least 2 months after expansion has stopped, and a fixed retainer should remain in place after removal of the distraction device for another 6 to 12 weeks. www.indiandentalacademy.com
  112. 112.  Surgical expansion can be accomplished by either posterior segmental osteotomies or a Le Fort I osteotomy, segmenting the maxilla in the down-fractured position. Where a large amount of expansion is required, bilateral palatal osteotomies should be performed. The osteotomy should be made just lateral to the nasal septum, where the palatal bone is thin and the mucosa thick. www.indiandentalacademy.com
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  114. 114.  Soft tissue release may be helpful for large expansion and should b performed off the osteotomy line. Grafting and appropriate rigid fixation should be used in palatal expansions of more than 3 mm.  Postsurgical orthodontic control of the expanded segments is paramount for optimal postsurgical stability. www.indiandentalacademy.com
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  116. 116. www.indiandentalacademy.com
  117. 117. Perception of facial esthetics: a comparison of similar class II cases treated with attempted growth modification or later orthognathic surgery  Shell TL, Woods MG Angle Orthod Dec 2003  In this study, it was the authors' intent to determine the esthetic outcomes for 60 Class II division 1 patients: 28 patients treated during the active growth phase with an activator and fixed appliances and 32 patients treated at the completion of growth with fixed appliances and by orthognathic surgery. www.indiandentalacademy.com
  118. 118.  Using a visual analogue scale, a mixed panel of 14 judges scored the pre- and posttreatment attractiveness of these patients from frontal and lateral facial photographs. Statistical analysis by twosample t-tests indicated that, on average, esthetic scores improved with treatment, regardless of the treatment modality. There was, however, considerable individual variation in the degree of improvement, even to the point that there was a decline in esthetics for some patients. www.indiandentalacademy.com
  119. 119.  Despite somewhat different modes of treatment, it was found that neither the average pre- and posttreatment esthetic scores nor the change in esthetic score with treatment was significantly different for the two groups. www.indiandentalacademy.com
  120. 120.  Although clinical planning decisions should still be made on an individual basis, the findings of this study suggest that the perceived esthetic outcome in many Class II division 1 patients may well be just as favorable, regardless of whether they are managed early during the growth phase or later, at the completion of growth by orthognathic surgery. www.indiandentalacademy.com
  121. 121. Long-term follow-up of Class II adults treated with orthodontic camouflage: a comparison with orthognathic surgery outcomes.  Mihalik CA, Proffit WR, Phillips C. AJODO 2003  Thirty-one adults who had been treated with orthodontics alone for Class II malocclusions were recalled at least 5 years posttreatment to evaluate cephalometric and occlusal stability and also their satisfaction with treatment outcomes. The data were compared with similar data for long-term outcomes in patients with more severe Class II problems who had surgical correction with mandibular advancement, maxillary impaction, or a combination of those. www.indiandentalacademy.com
  122. 122.  In the camouflage patients, small mean changes in skeletal landmark positions occurred in the long term, but the changes were generally much smaller than in the surgery patients. The percentages of patients with a long-term increase in overbite were almost identical in the orthodontic and surgery groups, but the surgery patients were nearly twice as likely to have a long-term increase in overjet. The patients' perceptions of outcomes were highly positive in both the orthodontic and the surgical groups. www.indiandentalacademy.com
  123. 123.  The orthodontics-only (camouflage) patients reported fewer functional or temporomandibular joint problems than did the surgery patients and had similar reports of overall satisfaction with treatment, but patients who had their mandibles advanced were significantly more positive about their dentofacial images. www.indiandentalacademy.com
  124. 124. Factors influencing postoperative satisfaction of orthognathic surgery patients.  Chen B, Zhang ZK, Wang X. IJAOOS 2002  The purpose of this study was to investigate the postoperative satisfaction of orthognathic surgery patients and related factors. The authors assessed 108 orthognathic surgery patients using the Minnesota Multiphasic Personality Inventory and the Symptom Checklist 90 preoperatively. The degree of deformity, expectations for surgery, and support of significant others were also evaluated before surgery. www.indiandentalacademy.com
  125. 125.  The patients were given questionnaires at 4 time points, from 10 days to 1 year after surgery. A multiple regression test was used to analyze the relative importance of psychologic factors and other variables in explaining the degree of patients'satisfaction with surgery. Postoperative satisfaction was high and increased with time. Patients with more education and more severe deformities reported greater satisfaction. www.indiandentalacademy.com
  126. 126.  During the early stage after surgery, patients with a high degree of interpersonal sensitivity, whose close relatives did not support surgery, or who accepted surgery passively tended to be more dissatisfied. Patients who had realistic expectations were more satisfied in the long term. Complications such as pain and swelling influenced patients' satisfaction soon after surgery, whereas the responses of people around the patients influenced their satisfaction at all stages postoperatively. www.indiandentalacademy.com
  127. 127. Temporomandibular dysfunction and orthognathic surgery.  Functional disturbances, together with esthetic considerations, are important reasons for patients to seek orthognathic surgical treatment. Functional disorders may include signs and symptoms of temporomandibular disorders (TMD), such as joint pain, chewing problems, joint noises, headaches, etc. Westermark A, Shayeghi F, Thor.A(Int J Adult Orthodon Orthognath Surg. 2001) reported on TMD before and after orthognathic surgery in 1,516 patients. It was based upon the patients' own evaluations as recorded 2 years after surgery. www.indiandentalacademy.com
  128. 128.  Preoperatively 43% and postoperatively 28% of the patients reported subjective symptoms of TMD. This difference indicates an overall beneficial effect of orthognathic surgery on TMD signs and symptoms. Patients with mandibular retrognathia did not improve as much as patients with mandibular prognathia. Sagittal ramus osteotomy was less effective than vertical ramus osteotomy in relieving TMD symptoms when performed on similar diagnoses. www.indiandentalacademy.com
  129. 129. Temporomandibular dysfunction in patients treated with orthodontics in combination with orthognathic surgery.  Egermark I, Blomqvist JE, Cromvik U, Isaksson S . EJO Oct 2000  Fifty-two patients with malocclusions underwent orthodontic treatment in combination with orthognathic surgery involving a Le Fort I and/or sagittal split osteotomy. Approximately 5 years after surgery, the patients were examined for signs and symptoms of temporomandibular disorders (TMD). The frequencies were found to be low in comparison with epidemiological studies in this field. The aesthetic outcome and chewing ability were improved in most patients (about 80 per cent). www.indiandentalacademy.com
  130. 130.  Some of the patients had reported recurrent and daily headaches before treatment. At examination, only two patients had reported having a headache once or twice a week, while all the others suffered from headaches less often or had no headache at all. Eighty-three per cent of the patients reported that they would be prepared to undergo the orthodontic/surgical treatment again with their present knowledge of the procedure. www.indiandentalacademy.com
  131. 131.  This study shows that orthodontic/surgical treatment of malocclusions not only has a beneficial effect on the aesthetic appearance and chewing ability, but also results in an improvement in signs and symptoms of TMD, including headaches. www.indiandentalacademy.com
  132. 132. Hierarchy of stability for Orthognathic surgery  Proffit WR, Turvey TA, Phillips C. IJAOOS 1996  The stability and predictability of orthognathic surgical procedures varies by the direction of surgical movement, the type of fixation, and the surgical technique employed, largely in that order of importance. www.indiandentalacademy.com
  133. 133.  The most stable orthognathic procedure is superior repositioning of the maxilla, closely followed by mandibular advancement in patients in whom anterior facial height is maintained or increased. (If facial height is decreased by upward rotation of the chin, stability is compromised). The combination of moving the maxilla upward and the mandible forward is significantly more stable when rigid internal fixation is used in the mandible. www.indiandentalacademy.com
  134. 134.  Forward movement of the maxilla is reasonably stable, with or without rigid internal fixation, but mandibular setback often is not stable, and downward movement of the maxilla that creates downward rotation of the mandible is unstable. For mandibular setback, the inclination of the ramus at surgery appears to be an important influence on stability. www.indiandentalacademy.com
  135. 135.  It has been suggested that both interpositional synthetic hydroxyapatite grafting and simultaneous ramus osteotomy improve the stability of downward movement of the maxilla, but this has not been well documented. www.indiandentalacademy.com
  136. 136.  In two-jaw Class III surgery, the stability of each jaw appears to be quite similar to that of isolated maxillary advancement or mandibular setback. The least stable orthognathic procedure is transverse expansion of the maxilla. Although surgically assisted rapid palatal expansion has been suggested as a more stable alternative to segmental Le Fort I osteotomy, the patterns of movement resulting from the two procedures are different, and differences in stability have not been established. www.indiandentalacademy.com
  137. 137. Postoperative skeletal stability following clockwise and counter-clockwise rotation of the maxillomandibular complex compared to conventional orthognathic treatment.  Reyneke JP, Bryant RS, Suuronen R, Becker PJ. (BJOMS Feb 2006)  Rotation of the maxillomandibular complex (MMC) and the consequent alteration of the occlusal plane (OP) angulation is a well documented orthognathic surgical design. This study compared the long-term postoperative skeletal stability following clockwise rotation (CR), and counter-clockwise rotation (CCR) of the MMC with the skeletal stability of patients treated according to conventional treatment planning principles. www.indiandentalacademy.com
  138. 138.  The long-term postoperative skeletal stability of the (CR) group and the (CCR) group of patients were found to compare favorably with the group of patients treated by conventional treatment (CT) planning. The long-term postoperative stability of all three groups also compared well with skeletal stability reported in the literature following double jaw surgery. www.indiandentalacademy.com
  139. 139. References  Graber, Vanarsdall. Orthodontics: Current Principles & Techniques. 4th Edition. Elsevier Mosby 2005  Proffit, Fields. Contemporary Orthodontics. 3rd Edition. Mosby 2000  David M. Sarver. Esthetic Orthodontics & Orthognathic Surgery. Mosby 1998 www.indiandentalacademy.com
  140. 140.  Shell TL, Woods MG Perception of facial esthetics: a comparison of similar class II cases treated with attempted growth modification or later orthognathic surgery.Angle Orthod. 2003 Aug;73(4):365-73.  Wolford LM, Reiche-Fischel O, Mehra P. Changes in temporomandibular joint dysfunction after orthognathic surgery. J Oral Maxillofac Surg. 2003 Jun;61(6):655-60; www.indiandentalacademy.com
  141. 141.  Mihalik CA, Proffit WR, Phillips C. Long-term follow-up of Class II adults treated with orthodontic camouflage: a comparison with orthognathic surgery outcomes.Am J Orthod Dentofacial Orthop. 2003 Mar;123(3):266-78  Jacobson R, Sarver DM. The predictability of maxillary repositioning in LeFort I orthognathic surgery.Am J Orthod Dentofacial Orthop. 2002 Aug;122(2):142-54. www.indiandentalacademy.com
  142. 142.  Aghabeigi B, Hiranaka D, Keith DA, Kelly JP, Crean SJ Effect of orthognathic surgery on the temporomandibular joint in patients with anterior open bite.Int J Adult Orthodon Orthognath Surg. 2001;16(2):153-60.  Westermark A, Shayeghi F, Thor A. Temporomandibular dysfunction in 1,516 patients before and after orthognathic surgery. Int J Adult Orthodon Orthognath Surg. 2001;16(2):145-51 www.indiandentalacademy.com
  143. 143.  Proffit WR, Turvey TA, Phillips C Orthognathic surgery: a hierarchy of stabilityInt J Adult Orthodon Orthognath Surg. 1996;11(3):191-204  Van Butsele BL, Mommaerts MY, Abeloos JS, De Clercq CA, Neyt LF. Creating lip seal by maxillo-facial osteotomies. A retrospective cephalometric study. J Craniomaxillofac Surg. 1995 Jun;23(3):165-74 www.indiandentalacademy.com
  144. 144.  Kahnberg KE, Vannas-Lofqvist L, Zellin G. Complications associated with segmentation of the maxilla: a retrospective radiographic follow up of 82 patients.Int J Oral Maxillofac Surg. 2005 Dec;34(8):840-5.  Kramer FJ, Baethge C, Swennen G, Teltzrow T, Schulze A, Berten J, Brachvogel P. Intra- and perioperative complications of the LeFort I osteotomy: a prospective evaluation of 1000 patients. J Craniofac Surg. 2004 Nov;15(6):971-7; discussion 978-9 www.indiandentalacademy.com
  145. 145.  Bailey LJ, Cevidanes LH, Proffit WR. Stability and predictability of orthognathic surgery. Am J Orthod Dentofacial Orthop. 2004 Sep;126(3):273-7.  Conley RS, Legan HL. Correction of severe vertical maxillary excess with anterior open bite and transverse maxillary deficiency. Angle Orthod. 2002 Jun;72(3):265-74 www.indiandentalacademy.com
  146. 146.  Costa F, Robiony M, Politi M. Stability of Le Fort I osteotomy in maxillary inferior repositioning: review of the literature. Int J Adult Orthodon Orthognath Surg. 2000 Fall;15(3):197204.  Costa F, Robiony M, Politi M.Stability of Le Fort I osteotomy in maxillary advancement: review of the literature.Int J Adult Orthodon Orthognath Surg. 1999;14(3):207-13. www.indiandentalacademy.com
  147. 147. Thank you For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com

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