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Necessity of bevels for box only Class II composite restorations
N J Opdam1, J J Roeters, R Kuijs
1University of Nijmegen, The Netherlands.
The Journal of Prosthetic Dentistry
|October 7, 1998
Summary
For small Class II composite restorations, beveling tooth preparations significantly reduces microleakage at the margins. This beveling technique ensures a better marginal seal for posterior composite restorations.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Clinical Research
Background:
- Beveling tooth preparations is a standard technique to enhance marginal quality in composite restorations.
- The specific benefit of beveling in minimal posterior Class II composite restorations regarding marginal fit remains unclear.
Purpose of the Study:
- To investigate how different tooth preparation designs influence microleakage in minimal posterior Class II composite restorations.
- To evaluate the impact of beveling on the marginal seal of small Class II composite restorations.
Main Methods:
- Maxillary premolars underwent box-shaped Class II preparations using a total etch technique.
- Preparations were either beveled or non-beveled, with variations in cervical angles and margin treatments.
- Teeth were subjected to thermocycling and dye immersion, followed by sectioning to assess dye penetration at facial and palatal margins.
Main Results:
- Beveling significantly reduced microleakage at both cervical and ascending walls.
- Enamel cracks were noted along specific unbeveled margins.
- Additional excavation of the box preparation did not yield a reduction in microleakage.
Conclusions:
- Beveling tooth preparations is recommended for achieving an optimal marginal seal in small, box-type Class II composite restorations.
- The findings support the use of bevels to improve the longevity and integrity of posterior composite restorations.