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Tooth preparations for complete crowns: an art form based on scientific principles.
C J Goodacre1, W V Campagni, S A Aquilino
1School of Dentistry, Loma Linda University, Loma Linda, Calif., 92350, USA. cgoodacre@sd.llu.edu
The Journal of Prosthetic Dentistry
|April 25, 2001
Summary
This review outlines scientific guidelines for complete coverage tooth preparations, focusing on optimal convergence angles, dimensions, and finish line selection for durable and aesthetic dental restorations.
Area of Science:
- Restorative Dentistry
- Dental Prosthodontics
- Biomaterials Science
Background:
- Current scientific knowledge on complete coverage tooth preparations lacks recent comprehensive review.
- Historical evolution of tooth preparation techniques requires updated scientific synthesis.
Purpose of the Study:
- To trace the historical development of complete coverage tooth preparations.
- To establish evidence-based guidelines for scientific tooth preparation.
Main Methods:
- Comprehensive literature review spanning 250 years of clinical practice.
- Focused analysis of scientific data from the last 50 years.
- Utilized MEDLINE and manual searches for English-language articles.
Main Results:
- Recommended preparation characteristics include 10-20 degrees total occlusal convergence, specific occlusocervical and faciolingual dimensions, and preservation of line angles.
- Auxiliary resistance features like axial grooves or boxes are advised for teeth lacking ideal geometry.
- Finish line selection depends on crown type, esthetics, and ease of formation, with supragingival placement often preferred.
Conclusions:
- Nine scientific principles have been formulated for successful complete coverage restorations.
- These principles address mechanical retention, biologic compatibility, and esthetic outcomes.
- Ensuring optimal tooth preparation is crucial for long-term restoration success.