Compomers adaptation to Class I and V cavities in permanent teeth

Area of Science:

• Dental Materials Science
• Restorative Dentistry
• Biomaterials

Background:

• Compomers are widely used in dental restorations.
• Understanding their marginal adaptation is crucial for clinical success.
• The effect of cavity preparation and surface treatment on adaptation requires further investigation.

Purpose of the Study:

• To evaluate the marginal and internal adaptation of Compoglass, Dyract, and Hytac in Class I and V cavities.
• To determine the influence of etching on the adaptation of these compomers.
• To compare the adaptation of compomers between Class I and V preparations.

Main Methods:

• Sixty molars were prepared with Class I and V cavities.
• Cavities were restored with Compoglass, Dyract, or Hytac, with or without etching.
• Adaptation was assessed at cavosurface margins and internal interfaces using light microscopy and SEM.
• Hybrid layer formation was also examined.

Main Results:

• Good adaptation was observed for all compomers, except non-etched Dyract in Class V cavities.
• Class V cavities generally showed better adaptation than Class I cavities.
• Compoglass and Dyract exhibited superior internal adaptation compared to Hytac.
• Etched cavities consistently formed a hybrid layer, unlike non-etched ones with poor resin penetration.

Conclusions:

• Compomer adaptation varies by material, cavity class, and etching treatment.
• Etching significantly enhances hybrid layer formation and restorative material adaptation.
• Class V cavities offer better adaptation potential for these compomers compared to Class I.