The influence of dental operating microscobe on the microlakage of composite resin and glass carbomer restorations, an in vitro study

Objectives: To compare the microlakage of composite resin and glass carbomer restorations and to evaluate the influence of using a dental operating microscobe in the preparation of class V restorations.
Methods: 14 extracted human premolar teeth were randomly assigned to two groups. Standardized class V cavities were prepared on the buccal surfaces using a dental operating microscobe (OPMI pico, Carl Zeiss) and 14 cavities on the lingual surfaces were prepared conventionally in each group. After the preparation of cavities, each group of teeth were divided in two subgroups. Group MZ: 7 restorations completed under microscobe, using Clearfil SE Bond and Filtek Z250 as the restorative material. Group Z: 7 restorations completed with conventional method using the same materials as group MZ. Group MG: 7 restorations completed under microscobe, using glass carbomer cement (GCP Glass Fill) with surface coating. Grup G: 7 restorations completed with conventional method using the same materials as group MG. 24 hours after the curing of materials all specimens were subjected to thermocycling (5 ± 2°C-55 ± 2°C, dwell time 20 s, 1000×). Specimens were immersed in 0.5% basic fuchsin for 24 h, sectioned and evaluated for dye penetration under stereomicroscobe. The statistical analysis were carried out using chi-square test (p<0.05).
Results: The differences between the occlusal microleakage scores between the groups were found statistically significant (p=0.009). The number of samples scored as no microleakage in group MZ 4 (%57.14) were significantly higher than groups MG and G 0 (%0) (p=0.026, p=0.03). Also,
no microleakage score samples obtained in group Z 5 (%7.43) were found significantly higher than groups MG and G 0 (%0) (p=0.007, p=0.006). The differences between the gingival microleakage scores were not found statistically significant (p>0.05).
Conclusions: Composite resin material showed significantly less occlusal microleakage than glass carbomer regardless of dental operating microscobe utilization.