The effect of thermocycling on microleakage of several commercially available composite Class V restorations in vitro

Wahab, Fouad K; Shaini, Firas J; Morgano, Steven M

doi:10.1016/S0022-3913(03)00300-7

« Previous Next »Journal of Prosthetic Dentistry
Volume 90, Issue 2 , Pages 168-174, August 2003

The effect of thermocycling on microleakage of several commercially available composite Class V restorations in vitro☆

Fouad K Wahab, BDS, MScD, PhD
- Associate Professor of Conservative Dentistry and Dental Materials Science, Head of Department of Conservative Dentistry and Prosthodontics, University of Jordan, Amman, Jordan
- Reprint requests to: Dr Fouad K. Wahab, The University of Jordan, Faculty of Dentistry, Department of Conservative Dentistry and Prosthodontics, Amman, Jordan, Fax: 962 6 535 5511
Firas J Shaini, BDS, MDentSc, PhD
- Assistant Professor of Conservative Dentistry and Dental Materials Science, Department of Conservative Dentistry and Prosthodontics, University of Jordan, Amman, Jordan
Steven M Morgano, DMD
- Professor and Director, Division of Postdoctoral Prosthodontics, Department of Restorative Sciences and Biomaterials, Boston University, Boston, Mass., USA

Abstract

Statement of the problem

Microleakage is a major factor contributing to the occurrence of secondary carious lesions around composite restorations.

Purpose of study

This in vitro study investigated the effect of thermocycling on microleakage of several composite Class V restorations.

Material and methods

One hundred twenty molars were randomly distributed into 6 groups of 20 teeth. Class V preparations were made in the buccal and lingual surfaces of each tooth and restored in bulk by use of 6 composites (Arabesk, Silux-Plus, Solitaire 2, Durafill VS, Charisma, and Renew) according to the manufacturers’ recommendations. The teeth were stored in distilled water at room temperature for 24 hours. The teeth in each group were divided randomly into 2 subgroups: (a) thermocycled for 500 cycles between 5° and 55°C with a dwell time of 30 seconds, (b) no thermocycling treatment. All restored teeth were immersed in 1% methylene blue dye for 4 hours and sectioned buccolingually with a diamond wheel. Dye penetration was scored by use of a stereomicroscope at original magnification ×4. The generalized linear models statistical analysis was used (α=.05).

Results

The preparation margins (enamel/dentin) and thermocycling had a significant effect on microleakage (P=.0351, P<.0001, respectively); the type of material had no significant effect (P=.1689).

Conclusions

Thermocycling significantly increased the microleakage (P<.0001). The overall microleakage at the enamel margins was significantly less than at the dentinal margins (P=.0351).