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Preventive and interceptive orthodontics


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Preventive and interceptive orthodontics

  2. 2. Orthodontic procedures can be divided as: Preventive Interceptive comprehensive
  3. 3. Preventive orthodontics Preventive procedures are undertaken in anticipation of development of a problem Patient and parent education , supervision of growth and development of dentition and craniofacial structures , the diagnostic procedures undertaken to predict the appearance of malocclusion and treatment procedures instituted to prevent the onset of malocclusion
  4. 4. Interceptive orthodontics Procedure are undertaken when the problem has already manifested.
  5. 5. Orthodontic problems in children can bedivided conveniently intonon skeletal (dental) and skeletalproblems , which are treated by toothmovement and by growth modification, respectively.
  6. 6. Preventive orthodontics Natal teeth Occlusal relationship problems Eruption Problems Space maintainence
  7. 7. Natal teeth Present at birth or erupt shortly after birth Most frequent in lower incisor region Only 10% are supernumerary therefore removed only when interfere with feeding or causing tongue ulceration
  8. 8. Occlusal relationship problemsa)Cross bites of Dental Originb) Oral Habits and Open Bites
  9. 9. Occlusal relationship problemsCross bites of Dental Origin: Correction of dental crossbites in the mixed dentition is recommended because it eliminates functional shifts
  10. 10. Minor canine interferenceleading to mandibular shift
  11. 11. Non skeletal anterior CrossbitesThe most common etiologic factor for non skeletal anterior Crossbites is lack of space for the permanent incisors, and it is important to focus the treatment plan on management of the total space situation, not just the crossbite.If the developing crossbite is discovered before eruption is complete and overbite has not been established the adjacent primary teeth can be extracted to provide the necessary space
  12. 12. Non skeletal anterior Crossbites Dental anterior crossbites typically develop as the permanent incisors erupt. Those diagnosed after overbite is established require appliance therapy for correction. The first concern is adequate space for tooth movement, which usually requires: 1: Bilateral disking, 2: Extraction of the adjacent primary teeth, 3: Or opening space for tooth movement.
  13. 13. Non skeletal anterior Crossbites
  14. 14. Non skeletal anterior Crossbites
  15. 15. Dental posterior cross bite early loss of a second deciduous molar causing a second premolar to erupt palatally/lingually retention of a primary tooth can deflect the eruption of the permanent successor leading to a cross bite.
  16. 16. Dental posterior cross bite
  17. 17. Dental posterior cross bite
  18. 18. Dental posterior cross bite
  19. 19. Oral Habits and Open BitesOpen bite in a preadolescent child has several possible causes:1: The normal transition as primary teeth are replaced by the permanent teeth2: A habit like finger sucking3: Tooth displacement by resting soft tissues
  20. 20. Open bite observed during thetransitional dentition years
  21. 21. Effects of Sucking HabitsThe effect of such a habit on the hard and soft tissues depends on its :1: Frequency(hours per day)2: Duration (months/years) With frequent and prolonged sucking, maxillary incisors are tipped facially, mandibular incisors are tipped lingually , and eruption of some incisors is impeded
  22. 22. Effects of Sucking Habits
  23. 23. Effects of Sucking Habits As long as the habit stops before the eruption of the permanent incisor, most of the changes resolve spontaneously.
  24. 24. Effects of Sucking HabitsNon-dental Intervention: As the time of eruption of the permanent incisors approaches, the simplest approach to habit therapy is a straightforward discussion between the child and the dentist that expresses concern and includes an explanation by the dentist.
  25. 25. Eruption problems Over-Retained Primary Teeth Supernumerary teeth Delayed Incisor eruption Ankylosed Primary Teeth Ectopic eruptions Transposition Primary failure of eruption Roots shortened by radiation therapy
  26. 26. Over-Retained Primary Teeth A permanent tooth should replace its primary predecessor when approximately three fourths of the root of the permanent tooth has formed, whether or not resorption of the primary roots is to the point of spontaneous exfoliation. A primary tooth that is retained beyond this point should be removed. An over-retained primary tooth leads to: Gingival inflammation Hyperplasia that causes pain and bleeding And sets the stage for deflected eruption paths that can result in: (a) irregularity, (b) crowding, (c) crossbite
  27. 27. Over-Retained Primary TeethOnce the primary tooth isout, if space is adequate,moderately abnormal facialor lingual positioning willusually be corrected by theequilibrium forces of the lip,cheeks and tongue
  28. 28. Supernumerary teeth Supernumerary teeth can disrupt both the normal eruption of other teeth and their alignment and spacing. The most common location for supernumerary teeth is the anterior maxilla . Treatment is aimed at: Extraction of the supernumeraries before problems arise OR at minimizing the effect if other teeth have already been displaced
  29. 29. Supernumerary teeth
  30. 30. Delayed Incisor EruptionSometimes incisors fail to erupt even when there is noretained or overlying primary tooth or supernumerary teeth present. Changes in the overlying keratinized tissue occur in long-standing edentulous region If the delayed incisor is located superficially it can be exposed with a simple soft tissue excision and usually will erupt rapidly . When the tooth is more deeply positioned, the overlying and adjacent tissue can be repositioned apically and the crown exposed, which usually leads to normal eruption or the tooth can have an attachment placed and repositioned orthodontically
  31. 31. Delayed Incisor Eruption
  32. 32. Delayed Incisor Eruption
  33. 33. Ankylosed Primary Teeth Appropriate management of an ankylosed primary molar consists of: maintaining it until an interference with eruption or drift of other teeth begins to occur, then extracting it and placing a lingual arch or other appropriate fixed appliance if needed
  34. 34. Ankylosed Primary TeethThis radiograph demonstrates both anterior andposterior teeth tipping over adjacent ankylosedprimary molars. The ankylosed teeth should beremoved if significant tipping and space loss areoccurring
  35. 35. Ectopic eruption Eruption is ectopic when a permanent tooth causes either: Resorption of a primary tooth other than the one it is supposed to replace OR resorption of an adjacent permanent tooth.
  36. 36. Ectopic eruption of Lateralincisors Loss of one or both primary canines from ectopic eruption usually indicates lack of enough space for all the permanent incisors, but occasionally may result solely from an aberrant eruption path of the lateral incisor. When one primary canine is lost, treatment is needed to prevent or correct a shift of the midline. Depending on the overall assessment ;the dentist can either: remove the contralateral canine or maintain the position of the lateral incisor on the side of the canine loss, using a lingual arch with a spur
  37. 37. If both mandibular primary canines are lost, the permanent incisors tip lingually, which reduces the arch circumference and increases the apparent crowding. A passive lingual arch to prevent the lingual tipping, or an active lingual arch for expansion may be indicated.
  38. 38. Ectopic eruption of MaxillaryFirst Molars When only small amounts of resorption are observed, a period of watchful waiting is indicated because self- correction is possible. If the blockage of eruption persists for 6 months or if resorption continues to increase, treatment is indicated. Lack of timely intervention may cause loss of the primary molar and space loss as the permanent molar erupts mesially.
  39. 39. A 20mil brass wire looped and tightened around the contact between the primary second molar and the permanent molar is suggested.The brass wire should be tightened approximately every 2 weeks
  40. 40. Some other options: A steel spring clip separator, available commercially, may work if only a small amount of resorption of the primary molar roots exists. A simple fixed appliance can be fabricated to move the molar distally.
  41. 41. An Arkansas spring
  42. 42. Ectopic eruption of MaxillaryCaninesEctopic eruption of maxillary canines occurs relatively frequently and can lead to either or both of two problems:( I )impaction of the canine and/or (2) resorption of permanent lateral incisor roots.There appears to be a genetic basis for this eruption phenomenon, and in some cases it is related to small or missing maxillary lateral incisors
  43. 43. At age 10, if the primary canine is not mobile andthereis no observable or palpable facial canine bulge,apanoramic,occlusal,or periapical radiograph isindicated
  44. 44. Ericson and Kurol found that if the permanent canine crown was overlapping less than halfof the root of the lateral incisor extract the overlying primary canine there was an excellent chance(91%) of normalization of the path of eruption. When more than half of the lateral incisor root was overlapped, Early Extraction of the primary tooth resulted in a 64% chance of normal eruption and likely improvement in the position of the canine even if it was not totally corrected
  45. 45. If the canine is not redirected by this procedure,it most likely will remain unerupted in a palatal position or erupt lingual to the maxillary incisors, but another consequence can be the beginning of resorption of the permanent incisor roots.If that occurs, usually it is necessary to surgically expose the permanent canine and use orthodontic force to bring it to its correct position
  46. 46. TranspositionTransposition is a positional interchange of two adjacent teeth.Often the best approach is to move a partially transposed tooth to a total transposed position, or to leave fully transposed teeth in that position
  47. 47. Transposition
  48. 48. Primary failure of eruption Diagnosis of primary failure of eruption often occurs in the late mixed dentition period when some or all the permanent first molars still have not erupted there is a genetic component to this problem. The affected teeth are not ankylosed, but do not erupt and do not respond normally to orthodontic force.
  49. 49. Roots shortened byradiotherapy Some of the irradiated teeth fail to develop, others fail to erupt, and some may erupt even though they have extremely limited root development. Although the roots are short, light forces can be used to reposition these teeth and achieve better occlusion without fear of tooth loss
  50. 50. Space maintenance Early loss of a primary tooth presents a potential alignment problem because drift of permanent or other primary teeth is likely unless it is prevented
  51. 51. IDEAL REQUIREMENTS OFSPACE MAINTAINERS Should maintain the desired mesiodistal dimensions of the space. Should not interfere with the eruption of the permanent teeth. Maintenance of functional movement (physiological) of the teeth. Should allow for space regainence, when required
  52. 52. Different types of spacemaintainers Band and Loop Space Maintainers Partial Denture Space Maintainers Distal Shoe Space Maintainers Lingual Arch Space Maintainers
  53. 53. Different types of spacemaintainers
  54. 54. Different types of spacemaintainers
  55. 55. Interceptive orthodontics Procedure are undertaken when the problem has already manifested.
  56. 56. Traumatic displacement ofteeth Prior to treatment, multiple radiographs at numerous vertical and horizontal angulations should be obtained to rule out vertical, and horizontal root fractures that may make it impossible to save the tooth.
  57. 57.  Vertical displacement of teeth is a major indication for post-trauma orthodonticsAll severely intruded teeth with mature apices become nonvital and fail to erupt. Early repositioning is critical to reduce the chance of ankylosis, improve access forendodontic
  58. 58. Traumatic displacement ofteeth Vertical displacement of teeth is a major indication for post-trauma orthodontics . All severely intruded teeth with mature apices become nonvital and fail to erupt. Early repositioning is critical to reduce the chance of ankylosis, improve access for
  59. 59. Traumatic displacement ofteeth Within 2 weeks of the injury, the intruded toothshould have been moved enough to allow endodonticaccess-ideally, it would be at or near the pre-trauma position.
  60. 60. Traumatic displacement ofteethPulp therapy is best instituted within 2 weeks to reduce the possibility of resorption. if further tooth movement of an endodontically-treated tooth will be needed during a second stage of comprehensive treatment, calcium hydroxide can be retained in the pulp chamber until active tooth movement is completed, as a hedge against root resorption
  61. 61. Traumatic displacement ofteeth
  62. 62. Traumatic displacement ofteeth The prognosis for pulp vitality is better in teeth that were not intruded when they were displaced, and in teeth with open apices follow-up periapical radiographs should be taken at 2 to 3 weeks, 6 to 8 weeks, and 1 year post-injury to check for pathologic changes
  63. 63. Traumatic displacement ofteethTeeth that were extruded at the time of injury and not immediately reduced pose a difficult problem. These teeth have reduced bony support and a poor crown root ratio.Attempts to intrude them result in bony defects between the teeth, so orthodontic intrusion is not a good plan. When the discrepancy is minor to moderate, reshaping the elongated tooth by crown reduction may be the best plan
  64. 64. Space related problemsExcess space:Midline diastema: A small maxillary midline diastema, which is present in many children, is not necessarily an indication for orthodontic treatment.The unerupted permanent canines often lie superior and distal to the lateral incisor roots, which forces the lateral and central incisor roots toward the midline of dental development
  65. 65. Ugly duckling stageThe spaces between the incisors, including the midline diastema, decrease and often completely disappear when the canines erupt . while their crowns diverge distally this condition of flared and spaced incisors is called the "ugly duckling" stage of developmentThese spaces tend to close spontaneously when the canines erupt and the incisor root and crown positions change
  66. 66. The ugly duckling phase
  67. 67. Midline diastema A small but unesthetic diastema (2 mm or less) can be closed in the early mixed dentition by tipping the central incisors together.
  68. 68. Midline diastema(2mm/less)
  69. 69. When a larger diastema(>2mm) is presentCauses can be:1. A midline supernumerary tooth2. Missing permanent lateral incisors3. digit-sucking habits What to do: Maxillary occlusal or periapical radiograph Bodily mesiodistal movement, an anterior segmental archwire from central to central incisor or the classic 2 x 4 appliance
  70. 70. Permanent retentionA fixed retainer to maintain diastema closure.A bonded 17.5mil multistrand wire with loops bent into the endsis bonded to the lingual surfaces of anterior teeth to serve as aPermanent retainer. This flexible wire allows physiologic mobilityOf the teeth and reduces bond failure but can be used onlv whenthe overbite is not excessive.
  71. 71. Maxillary Dental Protrusion andSpacing Treatment for maxillary dental protrusion during the early mixed dentition is indicated only when the maxillary incisors protrude with spaces between them and are esthetically objectionable or in danger of traumatic injury : it is often a sequel to prolonged thumb sucking
  72. 72. Maxillary Dental Protrusion andSpacing If there is adequate vertical clearance and space within the arch, maxillary incisors that have been displaced by a sucking habit can be tipped lingually with a removable or a fixed appliance
  73. 73. Maxillary Dental Protrusion andSpacing
  74. 74. Missing Permanent TeethMissing Second Premolars: If the patient has an ideal or an acceptable occlusion, maintaining the primary second molars is a reasonable plan if the space profile and jaw Relationships are good or some what protrusive,i t is possible to extract primary second molars that have no successor at age 7 to 9 and allow the first molars to drift mesially
  75. 75. Retention of primary molar
  76. 76. Extraction of primary molar toallow mesial drift of permanentmolar
  77. 77. Missing Maxillary LateralIncisors two sequelae usually is observed:1)the erupting permanent canine resorbs the primary lateral incisor and spontaneously substitutes for the missing lateral incisor.2) the primary lateral is retained when the permanent canine erupts in its normal position Long-term retention of primary laterals, in contrast to primary molars, is almost never an acceptable plan
  78. 78. Missing Maxillary LateralIncisors ultimate treatment is substitution of the canine for the lateral or opening space for a prosthetic replacement
  79. 79. Missing Maxillary LateralIncisors
  80. 80. Auto transplantation. In patients with a congenitally missing tooth or teeth in one area but crowding in another ,autotransplantation also is a possible solution. Teeth can be transplanted from one position to another in the same mouth with a good prognosis for long-term success if this is done when the transplanted tooth has approximately one half of its root formed."
  81. 81. Auto transplantation Transplantation is most commonly used to move premolars into the location of missing incisors. It can also be used to replace missing first molars with third molars
  82. 82. Space Regaining After premature loss of a primary tooth, space may be lost from drift of other teeth Up to 3 mm of space can be reestablished in a localized area with relatively simple appliances and a good prognosis
  83. 83. Maxillary Space Regaining Generally, space is easier to regain in the maxillary than in the mandibular arch, because of the increased anchorage for removable appliances afforded by the palatal vault and the possibility for use of extraoral force (headgear)
  84. 84. Maxillary Space Regaining
  85. 85. Maxillary Space Regaining A removable appliance retained with Adams clasps and incorporating a helical fingerspring adjacent to the tooth to be moved is very effective. This appliance is the ideal design for tipping one molar . One posterior tooth can be moved up to 3 mm distally during 3 to 4 months of full-time appliance wear. The spring is activated approximately 2 mm to produce I mm of movement per month
  86. 86.  For unilateral bodily space regaining, a fixed intra-arch appliance is preferred
  87. 87. Maxillary Space Regaining If bodily movement of both permanent maxillary first molars is necessary in regaining space this can be accomplished by using a banded and bonded fixed appliance or headgear Sometimes both molars need to be moved distally but one requires substantially more movement than the other. To accomplish this, an asymmetric facebow with a neckstrap attachment can be used
  88. 88. Maxillary Space Regaining
  89. 89. Mandibular Space Regaining For unilateral mandibular space regaining, the best choice is a fixed appliance and an archwire a lingual arch can be used to support the tooth movement and provide anchorage when used in conjunction with a segmental archwire and coil spring
  90. 90. Mandibular Space Regaining
  91. 91. Mandibular Space Regaining If space has been lost bilaterally there are two choice:1) an adjustable lingual arch and2) a lip bumper.
  92. 92. Mandibular Space Regaining
  93. 93. Mandibular Space Regaining
  94. 94. Serial extractionIndications:1.Straight profile2.Class I malocclusion3.Arch length discrepency in maxilla should be 11 mm while in mandibular arch 10.5 mm
  95. 95. Serial extractionContraindications:1. Convex profile2. Class II malocclusion3. Low angle case4. High angle case
  96. 96. Advantages of serial extraction Reduces the severity of malocclusion Reduces the extent of mechanotherapy Reduces the duration of treatment
  97. 97. Disadvantages of serialextraction Chances of increasing overbite Canines may fail to migrate distally Anterior teeth may tip lingually
  98. 98. Methods of serial extractionDewel’s method (cd4)Tweed’s method (d4c)
  99. 99. Q&A