ANATOMICAL LANDMARKS

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ANATOMICAL LANDMARKS AND THEIR CLINICAL SIGNIFICANCE.:

ANATOMICAL LANDMARKS AND THEIR CLINICAL SIGNIFICANCE. INDIAN DENTAL ACADEMY www.indiandentalacademy.com Leader in continuing dental education www.indiandentalacademy.com

PowerPoint Presentation:

Labial frenum: Fold of mucous membrane at the median line. Moves with muscles of lip. Adequate relief for muscle activity. Proper denture seal. Excessive relief weakens denture base. Maxillary arch A- correct contour B –incorrect contour. C- area should have been covered. Labial notch www.indiandentalacademy.com

Buccal frenum: :

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. Maxillary buccal frenum area. Denture border contour in buccal frenum area. Buccal notch www.indiandentalacademy.com

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Labial vestibule Labial-buccal frenum. Muco-gingival line-limits upper border. Record adequate depth/width. Overextension causes instability/soreness. Proper contouring gives optimal esthetics. Labial flange www.indiandentalacademy.com

Buccal vestibule:

Buccal vestibule Buccal frenum to hamular notch. Record adequate depth/width. Improper extension causes instability/soreness. Buccal flange www.indiandentalacademy.com

Maxillary tuberosity.:

Maxillary tuberosity. Distal end of denture must have Coverage-stability/retention. Gross enlargement(fibrous or bony –surgical correction. Area of tuberosity www.indiandentalacademy.com

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Distal to maxillary tuberosity Aids in locating posterior palatal seal. Overextension causes soreness. Hamular notch . Area of hamular notch www.indiandentalacademy.com

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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. Aids in retention. . www.indiandentalacademy.com

Fovea Palatinae.:

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:

Hard palate Support for the maxillary denture. Primary stress bearing area- horizontal portion of hard palate lateral to midline. Secondary stress bearing area –rugae. www.indiandentalacademy.com

Alveloar ridge :

Alveloar ridge Residual bone with mucous membrane. Primary stress bearing area. Alveolar groove www.indiandentalacademy.com

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Elevation of soft tissue over the incisive foramen or nasopalatine canal. Location : on or labial to ridge. Impingement –burning sensation, parasthesia and pain. Relief necessary. Incisive papilla. Incisive fossa www.indiandentalacademy.com

Rugae.:

Rugae. Irregular shaped rolls of soft tissue. Secondary stress bearing area. Should not be distorted in the impression. www.indiandentalacademy.com

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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 raphae. Median palatine groove www.indiandentalacademy.com

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Labial frenum. Shorter and wider than the maxillary frenum. Adequate relief for muscle activity (mentalis). Proper fit around it maintains seal without soreness. Mandibular arch. Labial notch . www.indiandentalacademy.com

Buccal frenum. :

Buccal frenum. Adequate relief for muscle activity. Proper denture seal. Buccal notch. www.indiandentalacademy.com

PowerPoint Presentation:

Labial vestibule. 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. Labial flange www.indiandentalacademy.com

Buccal vestibule. :

Buccal vestibule. Buccal frenum-retromolar pad. Record adequate depth and width. Impression is widest in this area. Buccal flange www.indiandentalacademy.com

Buccal shelf:

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.:

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:

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.:

Retromolar pad . Triangular soft pad of 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. Retromolar fossa www.indiandentalacademy.com

Alveolo-Lingual sulcus.:

Alveolo-Lingual sulcus. Between lingual frenum to retromylohyoid curtain. Anterior region- lingual frenum to mylohyoid ridge. Premylohyoid fossa- premylohyoid 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. Lingual flange Premylohyoid eminence www.indiandentalacademy.com

PowerPoint Presentation:

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

PowerPoint Presentation:

Posterior region. The flange passes into the retromylohyoid fossa. Proper recording gives typical S –form of the lingual flange. www.indiandentalacademy.com

Retromylohyoid space.:

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.:

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.:

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.:

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.:

Lingual frenum. Fold of mucous membrane. Base of tongue to supragenial tubercle. Registered in function. Lingual notch www.indiandentalacademy.com

PowerPoint Presentation:

Thank you. For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com

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