Prosthodontics

Impression making is a critical step in prosthodontics and orthodontics, as it captures the details of the oral cavity for the fabrication of dental prostheses. There are several techniques for making impressions, each with its own principles and applications. Here, we will discuss three primary impression-making techniques: Mucostatic, Mucocompressive, and Selective Pressure Impression Techniques. 1. Mucostatic or Passive Impression Technique Propose…

 Bite Registration Thin medium, no tooth contact Use low-viscosity materials (e.g., waxes, elastomers) to record occlusal relationships without interference from tooth contact. Ensures accurate centric relation or maximum intercuspation records. Gingival Management & Impression Protocols Impression after cord removal Take impressions only after bleeding has stopped to avoid voids and distortion. Gingival Sulcu…

Clasp Type Key Features Indications Circumferential (Akers) Cast, engages undercut from opposite side Common in tooth-supported RPDs Bar (Roach) Approaches undercut from gingival direction Used when esthetics are a concern Ring Clasp Encircles nearly the entire tooth Useful for tipped molars Combination Clasp Wrought wire retentive arm + cast reciprocal arm Offers flexibility and adaptability …

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…

Muscle Function Clinical Relevance Masseter Elevates mandible (closes jaw) Key in mastication; affects occlusal forces Temporalis Elevates and retracts mandible Guides centric relation; helps in CR recording Medial Pterygoid Elevates and protrudes mandible Assists in lateral movements Lateral Pterygoid Protrudes and depresses mandible Controls orbito…