Parts of Fixed Dental Prosthesis Dr Muhammad Rizwan
- Slides: 18
Parts of Fixed Dental Prosthesis Dr. Muhammad Rizwan Memon F. C. P. S Assistant Professor
Parts of FDP Retainers 2. Pontic 3. Connectors 1.
Connector Pontic Retainer Abutment Preparation Abutment Edentulous Ridge
Retainer A part of FDP which unites the abutments to the remainder of the restoration (GPT 8 -2005) Abutment: A tooth, a portion of a tooth, or that portion of a dental implant that serves to support and/or retain a prosthesis.
Types of Retainers Major retainers • FVC, PVC Minor retainers • Inlay, onlay Conservative retainers Telescopic retainers All metal, Metal Ceramic, All ceramic, All acrylic retainers
Pontic: An artificial tooth on a FDP that replaces a missing tooth, restores function and usually fills the space previously filled by a natural crown (GPT 8 -2005).
Ideal Pontic �Biologic • Can maintain healthy tissues • Cleansable �Mechanical • Strong enough to withstand functional forces • Rigid & resistant to deformation • Provides normal function �Esthetic • Looks like the tooth it replaces • Tissue contacts appear as normal tooth
Types of Pontics/ Classification With mucosal contact • • • Saddle pontic Ridge lap pontic Modified ridge lap pontic Ovate pontic Bullet shaped/ conical/ heart shaped/dome shape pontic Without mucosal contact • Sanitary/hygienic pontic
Saddle Pontic Overlaps the ridge Most natural feeling Most difficult to clean Used for • Limited occlusal-gingival space • Patients who object to lingual space
Ridge Lap Pontic � Resembles natural tooth � Like saddle on buccal � Convex on the lingual � Forms a large concave contact with ridge � Non-cleansable � Tissue inflammation � Do not use
Modified Ridge Lap � Aesthetic � Convex tissue surface � Used routinely in aesthetic zone � Contacts tissue only on most facial surface of the pontic � Most cleansable � Least tissue irritation � Space between pontic and tissue on lingual can be unacceptable to some patient
Conical � Rounded and cleansable � Triangular embrasures may trap debris � Suited for thin mandibular ridges � Non-esthetic regions
Ovate � Highly aesthetic � Bluntly rounded pontic tip set into concavity in the ridge � Pontic appears to be “growing” from ridge � Difficulty in cleaning � Potential for tissue irritation
Hygienic � No contact with ridge � Most cleansable � Used in non-aesthetic areas � Used primarily in posterior regions � Convex in all directions � O-G thickness no less than 3 mm � Amount of space under 1 - 1. 5 mm
Connectors: The portion of FDP that unites the retainers and pontics (GPT 8 -2005).
Types of Connectors Rigid Connectors a cast, soldered, or fused union between the retainer and pontic (GPT-8 -2005)
Non Rigid Connectors any connector that permits limited movement between otherwise independent members of a fixed dental prosthesis (GPT-8 -2005) • • Tenon- Mortise Connectors Loop Connectors Split Pontic Connectors Cross Pin and Wing connectors
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