Prosthodontics

Incisal Reduction All ceramic crowns: Minimum 2 mm reduction required Ensures adequate material thickness for strength and aesthetics Margin Design Specifications Porcelain crowns: Shoulder finish line Ceramic crowns (gingival): Shoulder finish line Veneer margins: Chamfer finish line Metal-ceramic crowns (lingual): Chamfer finish line Reduction Requirements Facial reduction for veneers: Minimum 0.5 mm Provides space for adequate…

Type Design Features Indications Lingual Bar Half pear-shaped cross-section; requires ≥7 mm vertical space Most common; when space permits Lingual Plate Covers lingual surfaces of teeth; extends to cingula Used when vertical space is inadequate or teeth are periodontally compromised Double Lingual Bar (Kennedy Bar) Lingual bar + secondary bar near cingula; creates window Enhances indirect retention; …

Component Function Major Connector Unites components on one arch; distributes forces across the arch. Examples: palatal strap, lingual bar. Minor Connector Connects major connector to other components (e.g., clasps, rests). Direct Retainer (Clasp Assembly) Provides retention by engaging undercuts on abutment teeth. Indirect Retainer Prevents rotation of the denture around the fulcrum line; supports stab…

LIMITING STRUCTURES A) Labial, lingual & buccal frenum - It is fibrous band extending from the labial aspect of the residual alveolar ridge to the lip containing a band of the fibrous connective tissue the that helps in attachment of the orbicularis oris muscle. - It is quite sensitive hence the denture should have an appropriate labial notch. - The fibers of buccinator are attached to the buccal frenum. - Should be relieved to prevent displacement of t…