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Indirect composite preparation width and depth and tooth fracture resistance
D C Watts1, N H Wilson, F J Burke
1Department of Restorative Dentistry, University Dental Hospital of Manchester, United Kingdom.
American Journal of Dentistry
|February 1, 1995
Summary
Preparation depth and width significantly impact tooth fracture resistance with indirect composite restorations. Shallower preparations and narrower widths may reduce severe tooth fractures, guiding clinical decisions for durable restorations.
Area of Science:
- Restorative Dentistry
- Biomaterials Science
- Dental Mechanics
Background:
- Indirect composite restorations are widely used for tooth restoration.
- Understanding preparation parameters is crucial for restoration longevity and tooth integrity.
- Fracture resistance is a key factor in evaluating restorative treatment success.
Purpose of the Study:
- To investigate how preparation width and depth affect the fracture resistance of teeth.
- To analyze the influence of these parameters on teeth restored with a specific indirect composite material.
Main Methods:
- Controlled variations in preparation depth (3-4 mm) and width (one-third vs. one-half bucco-lingual) were applied to dentin preparations.
- Indirect composite restorations were fabricated and cemented following manufacturer guidelines.
- Restored teeth underwent compressive loading tests using a universal testing machine until fracture occurred.
Main Results:
- Preparation depths between 3 to 4 mm were generally preferable for fracture resistance.
- However, shallower preparation depths were indicated when minimizing severe tooth fractures.
- Narrower cavity widths (one-third bucco-lingual) resulted in statistically lower fracturing forces compared to wider preparations.
Conclusions:
- Preparation dimensions critically influence the fracture resistance of indirectly restored teeth.
- A balance between preparation depth and width is necessary to optimize fracture resistance and minimize catastrophic tooth failure.
- Clinical recommendations should consider these findings for improved indirect composite restoration outcomes.