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Anatomical landmarks  /certified fixed orthodontic courses by Indian dental academy
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Anatomical landmarks /certified fixed orthodontic courses by Indian dental academy

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  • Anatomical landmarks and their clinical significance in complete Denture Impressions. <br /> Dr N.S.Azhagarasan. <br /> Dept of prosthodontics <br /> Ragas dental college and hospital. <br />
  • Labial frenum: <br /> Fold of mucous membrane at the median line. <br /> Moves with muscles of lip. <br /> Adequate relief for muscle activity. <br /> Proper denture seal. <br /> Excessive relief weakens denture base. <br />
  • Single or double folds of mucous membrane. <br /> Broad and fan shaped. <br /> Moves with muscles of cheek during speech and mastication. <br /> Adequate relief for muscle activity-more clearence. <br />
  • Labial vestibule <br /> Labial-buccal frenum. <br /> Muco-gingival line-limits upper border. <br /> Record adequate depth/width. <br /> Overextension causes instability/soreness. <br /> Proper contouring gives optimal esthetics. <br />
  • Buccal frenum to hamular notch. <br /> Record adequate depth/width. <br /> Improper extension causes instability/soreness. <br />
  • Distal end of denture must have Coverage-stability/retention. <br /> Gross enlargement(fibrous or bony –surgical correction. <br />
  • Distal to maxillary tuberosity <br /> Aids in locating posterior palatal seal. <br /> Overextension causes soreness. <br />
  • Vibrating line: <br /> Junction of movable and immovable part of soft palate. <br /> 2mm ant to fovea palatinae. <br /> Aids to establish PPS. <br /> Distal end of denture at least to vibrating line. <br /> Post palatal seal area. <br /> From hamular notch to hamular notch. <br /> Anterior to vibrating line. <br /> Aids in retention. <br />
  • Bilateral indentations near the midline of palate. <br /> Formed by coalescence of several mucous gland ducts. <br /> Posterior to junction of hard and soft palate. <br /> Aids in determining vibrating line. <br />
  • Support for the maxillary denture. <br /> Primary stress bearing area- horizontal portion of hard palate lateral to midline. <br /> Secondary stress bearing area –rugae. <br />
  • Residual bone with mucous membrane. <br /> Primary stress bearing area. <br />
  • Elevation of soft tissue over the incisive foramen or nasopalatine canal. <br /> Location : on or labial to ridge. <br /> Impingement –burning sensation, parasthesia and pain. <br /> Relief necessary. <br />
  • Irregular shaped rolls of soft tissue. <br /> Secondary stress bearing area. <br /> Should not be distorted in the impression. <br />
  • Extends from incisive papilla to distal end of hard palate. <br /> Thin mucosal covering and non-resilient.. <br /> Relieve adequately to avoid trauma from denture base. <br />
  • Labial frenum. <br /> Shorter and wider than the maxillary frenum. <br /> Adequate relief for muscle activity (mentalis). <br /> Proper fit around it maintains seal without soreness. <br />
  • Adequate relief for muscle activity. <br /> Proper denture seal. <br />
  • Labial vestibule. <br /> Labial-buccal frenum. <br /> Overextension causes instability/soreness. <br /> Muscles attachment close to the crest of the ridge- limits the denture flange extension. <br /> Mucolabial fold limits the depth of the flange. <br /> Record adequate depth and width. <br /> Proper contouring gives optimal esthetics. <br />
  • Buccal frenum-retromolar pad. <br /> Impression is widest in this area. <br /> Record adequate depth and width. <br />
  • Extends from buccal frenum to retromolar pad. <br /> Between external oblique ridge and crest of alveolar ridge. <br /> Primary stress bearing area- lies at right angles to vertical occlusal forces. <br />
  • A bony ridge runs antero-posteriorly outside the buccal shelf. <br /> Denture border 1-2 mm beyond this ridge. <br /> Shows as Groove in impression. <br />
  • Residual bone with mucous membrane. <br /> Crest to be relieved. <br /> Buccal and lingual slopes are secondary stress bearing areas. <br />
  • Triangular soft pad of tissue. <br /> Posterior end of lower edentulous ridge. <br /> Limiting landmark of distal extension of complete denture upto ant 2/3 rd of retro molar pad. <br /> Determines height and width of the occlusal table. <br />
  • Between lingual frenum to retromylohyoid curtain. <br /> Anterior region- lingual frenum to mylohyoid ridge. <br /> Premylohyoid fossa- premylohyoid eminence in impression. <br /> Border of Impression to make contact with the mucosa of the floor of the mouth when tongue touches the upper incisor. <br /> Overextension causes soreness and instability. <br />
  • Middle region. <br /> From pre-mylohyoid fossa to the distal end of the mylohyoid ridge. <br /> Lingual flange extends below the level of the mylohyoid ridge- tongue rests on the top of flange and aids in stabilizing the lower denture. <br />
  • Posterior region. <br /> The flange passes into the retromylohyoid fossa. <br /> Proper recording gives typical S –form of the lingual flange. <br />
  • Distal end of lingual sulcus. <br /> Area posterior to the mylohyoid muscle. <br /> Good seal aids in retention and stability. <br />
  • Attachment for the mylohyoid muscle. <br /> Sharp or irregular covered by the mucous membrane. <br /> Trauma from denture base –relief necessary. <br />
  • Floor of the mouth is formed by mylohyoid muscle. <br /> Lies deep to the sublingual gland in the anterior region- does not affect the border of denture. <br /> Posterior region –affects the lingual border in swallowing and tongue movements. <br />
  • Area of muscle attachment (Genioglossus and Geniohyoid). <br /> Lies away from the crest of the ridge. <br /> Prominent in Resorbed ridges. <br /> Adequate relief to be provided. <br />
  • Fold of mucous membrane. <br /> Base of tongue to supragenial tubercle. <br /> Registered in function. <br />

Anatomical landmarks  /certified fixed orthodontic courses by Indian dental academy Anatomical landmarks /certified fixed orthodontic courses by Indian dental academy Presentation Transcript

  • ANATOMICAL LANDMARKS AND THEIR CLINICAL SIGNIFICANCE. INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  • Maxillary arch Labial frenum: • Fold of mucous membrane at • • •A- correct contour • • the median line. Moves with muscles of lip. Adequate relief for muscle activity. Proper denture seal. Excessive relief weakens denture base. •B –incorrect contour. •C- area should have been covered. www.indiandentalacademy.com Labial notch
  • Buccal frenum:  Single or double folds of mucous membrane.  Broad and fan shaped.  Moves with muscles of cheek during speech and mastication.  Adequate relief for muscle activity-more clearence. Buccal notch •Maxillary buccal frenum area. •Denture border contour in buccal frenum area. www.indiandentalacademy.com
  • Labial vestibule • Labial-buccal frenum. • Muco-gingival linelimits upper border. • Record adequate depth/width. •Labial flange • Overextension causes instability/soreness. • Proper contouring gives optimal www.indiandentalacademy.com
  • Buccal vestibule • Buccal frenum to • • hamular notch. Record adequate depth/width. Improper extension causes instability/soreness. Buccal flange www.indiandentalacademy.com
  • Maxillary tuberosity. • Distal end of denture must have Coveragestability/retention. • Gross Area of tuberosity enlargement(fibrous or bony –surgical correction. www.indiandentalacademy.com
  • Hamular notch. •Distal to maxillary tuberosity •Aids in locating posterior palatal seal. •Overextension causes soreness. Area of hamular notch www.indiandentalacademy.com
  • Vibrating line: • Junction of movable and • • • immovable part of soft palate. 2mm ant to fovea palatinae. Aids to establish PPS. Distal end of denture at least to vibrating line. Post palatal seal area. • From hamular notch to hamular notch. • Anterior to vibrating line. www.indiandentalacademy.com • Aids in retention.
  • Fovea Palatinae. • Bilateral indentations • • • near the midline of palate. Formed by coalescence of several mucous gland ducts. Posterior to junction of hard and soft palate. Aids in determining vibrating line. www.indiandentalacademy.com
  • Hard palate • Support for the maxillary denture. • Primary stress bearing areahorizontal portion of hard palate lateral to midline. • Secondary stress bearing area – rugae. www.indiandentalacademy.com
  • Alveloar ridge • Residual bone with • mucous membrane. Primary stress bearing area. Alveolar groove www.indiandentalacademy.com
  • Incisive papilla. • Elevation of soft tissue • •Incisive fossa • • over the incisive foramen or nasopalatine canal. Location : on or labial to ridge. Impingement –burning sensation, parasthesia and pain. Relief necessary. www.indiandentalacademy.com
  • Rugae. • Irregular shaped rolls • • of soft tissue. Secondary stress bearing area. Should not be distorted in the impression. www.indiandentalacademy.com
  • Median palatine raphae. • Extends from incisive • • papilla to distal end of hard palate. Thin mucosal covering and non-resilient.. Relieve adequately to avoid trauma from denture base. Median palatine groove www.indiandentalacademy.com
  • Mandibular arch. Labial frenum. • Shorter and wider than the maxillary frenum. • Adequate relief for muscle activity (mentalis). • Proper fit around it maintains seal Labialwithout soreness. notch. www.indiandentalacademy.com
  • Buccal frenum. • Adequate relief for muscle activity. • Proper denture seal. Buccal notch. www.indiandentalacademy.com
  • Labial vestibule. • • • • • • Labial flange Labial-buccal frenum. Overextension causes instability/soreness. Muscles attachment close to the crest of the ridge- limits the denture flange extension. Mucolabial fold limits the depth of the flange. Record adequate depth and width. Proper contouring gives optimal esthetics. www.indiandentalacademy.com
  • Buccal vestibule. • Buccal frenum• • retromolar pad. Record adequate depth and width. Impression is widest in this area. Buccal flange www.indiandentalacademy.com
  • Buccal shelf • Extends from buccal frenum • • to retromolar pad. Between external oblique ridge and crest of alveolar ridge. Primary stress bearing area(cortical bone)- lies at right angles to vertical occlusal forces. www.indiandentalacademy.com
  • External oblique ridge. • A bony ridge runs antero-posteriorly outside the buccal shelf. • Denture border 1-2 mm beyond this ridge. • Shows as Groove in impression. www.indiandentalacademy.com
  • Alveolar ridge • Residual bone with • • mucous membrane. Crest to be relieved. Buccal and lingual slopes are secondary stress bearing areas. www.indiandentalacademy.com
  • Retromolar pad. • Triangular soft pad of • • • Retromolar fossa tissue. Posterior end of lower edentulous ridge. Limiting landmark of distal extension of complete denture upto ant 2/3 rd of retro molar pad. Determines height and width of the occlusal table. www.indiandentalacademy.com
  • Alveolo-Lingual sulcus. • Between lingual frenum to • • • Premylohyoid eminence Lingual flange • retromylohyoid curtain. Anterior region- lingual frenum to mylohyoid ridge. Premylohyoid fossapremylohyoid eminence in impression. Border of Impression to make contact with the mucosa of the floor of the mouth when tongue touches the upper incisor. Overextension causes soreness and instability. www.indiandentalacademy.com
  • Middle region. • From pre-mylohyoid fossa to the distal end of the mylohyoid ridge. • Lingual flange extends below the level of the mylohyoid ridge- tongue rests on the top of flange and aids in stabilizing the lower denture. www.indiandentalacademy.com
  • Posterior region. • The flange passes into the retromylohyoid fossa. • Proper recording gives typical S – form of the lingual flange. www.indiandentalacademy.com
  • Retromylohyoid space. • Distal end of lingual • • sulcus. Area posterior to the mylohyoid muscle. Good seal aids in retention and stability. Retromylohyoid eminence www.indiandentalacademy.com
  • Mylohyoid ridge. • Attachment for the mylohyoid muscle. • Sharp or irregular covered by the mucous membrane. • Trauma from denture base –relief necessary. www.indiandentalacademy.com
  • Mylohyoid muscle. • Floor of the mouth is formed by mylohyoid muscle. • Lies deep to the sublingual gland in the anterior region- does not affect the border of denture. • Posterior region –affects the lingual border in swallowing and tongue movements. www.indiandentalacademy.com
  • Genial tubercle. • Area of muscle • • • attachment (Genioglossus and Geniohyoid). Lies away from the crest of the ridge. Prominent in Resorbed ridges. Adequate relief to be provided. www.indiandentalacademy.com
  • Lingual frenum. • Fold of mucous • • membrane. Base of tongue to supragenial tubercle. Registered in function. Lingual notch www.indiandentalacademy.com
  • www.indiandentalacademy.com Leader in continuing dental education www.indiandentalacademy.com