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Effect of cavity preparation instruments (oscillating or rotating) on the composite-dentin interface in primary teeth
Thomas Pioch1, Franklin García-Godoy, Heinz Duschner
1Department of Restorative Dentistry, University of Heidelberg, Im Neuenheimer Feld 400, D-69120 Heidelberg, Germany. thomas_pioch@me.uni-heidelberg.de
Summary
Cavity preparation using SonicSys, an ultrasonic system, showed no negative impact on the bond between tooth structure and composite fillings. This finding supports its use in dental restorations for maintaining interfacial integrity.
Area of Science:
- Restorative Dentistry
- Dental Materials Science
- Biomaterials
Background:
- Maintaining the integrity of the interface between tooth structure and dental restorations is crucial for long-term clinical success.
- Various cavity preparation methods exist, each potentially influencing this interfacial integrity.
Purpose of the Study:
- To assess the effect of SonicSys, an ultrasonic instrument, on the interfacial integrity between the cavity wall and composite resin restorations.
- To compare the hybrid layer thickness and marginal integrity of cavities prepared with SonicSys versus conventional burs.
Main Methods:
- Class II slot preparations were performed on primary teeth using either SonicSys or a conventional bur.
- Cavities were restored with an adhesive system, followed by a flowable and a condensable composite resin.
- Specimens were analyzed using confocal laser scanning microscopy to evaluate the hybrid layer and interfacial integrity.
Main Results:
- The mean hybrid layer thickness was comparable between the SonicSys group (6.12 ± 0.60 µm) and the conventional bur group (6.04 ± 0.63 µm), with no statistically significant difference.
- Minor enamel fractures were observed in one tooth from each group, indicating no specific disadvantage associated with SonicSys preparation.
Conclusions:
- Cavity preparation using SonicSys does not adversely affect the interfacial integrity between the cavity wall and composite restorations compared to conventional bur preparation.
- SonicSys is a viable alternative for cavity preparation, maintaining the quality of the tooth-composite interface.