This high-yield revision note on Fixed Partial Denture: Tooth Preparation Principles & Failures covers everything examiners typically test under Prosthodontics — structured as quick-reference tables, clinical correlations, mnemonics and previous-year-style high-yield points. It's built for last-mile revision before NEET MDS, INI-CET MDS and INBDE, so you can scan it in minutes instead of re-reading a whole textbook chapter.
| Principle | Detail |
|---|---|
| Preparation principles (Shillingburg) | Biologic (preserve tooth structure/pulp vitality, supragingival margins where possible, adequate finish-line design), Mechanical (retention and resistance form, sufficient structural durability for the material chosen), Esthetic |
| Retention form | Prevents dislodgement along the path of insertion - determined by preparation taper (ideally around 6° total occlusal convergence), preparation height, and surface area |
| Resistance form | Prevents dislodgement from oblique/lateral forces - determined by taper, and by preparation height-to-width ratio (shorter/wider preparations offer LESS resistance form) |
| Connector design | A rigid connector is ideal for a fixed partial denture; minimum recommended dimensions are approximately 3mm occlusogingivally by 3mm mesiodistally, to prevent connector fracture |
| Pontic designs | Ridge lap (best esthetics but hygiene concerns), Modified ridge lap (MOST COMMONLY used - balances esthetics and hygiene), Ovate pontic (best esthetics, requires shaping of the extraction socket), Sanitary/hygienic pontic (posterior, non-esthetic zones, best hygiene access) |
| Most common FPD failure cause (long-term) | Secondary caries at the restoration margins |
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