Abstract
Objective The objective of this study was to investigate the effects of cavity configuration on the shrinkage vectors of a flowable resin-based composite (RBC) placed in occlusal cavities. Materials and methods Twenty-seven human molars were divided into three groups (n = 9) according to cavity configuration: "adhesive," "diverging," and "cylindrical." The "adhesive" cavity represented beveled enamel margins and occlusally converging walls, the "diverging" cavity had occlusally diverging walls, and the "cylindrical" cavity had parallel walls (diameter = 6 mm);all cavities were 3 mm deep. Each prepared cavity was treated with a self-etch adhesive (Adper Easy Bond, 3 M ESPE) and filled with a flowable RBC (Tetric EvoFlow, Ivoclar Vivadent) to which had been added 2 wt% traceable glass beads. Two micro-CT scans were performed on each sample (uncured and cured). The scans were then subjected to medical image registration for shrinkage vector calculation. Shrinkage vectors were evaluated three-dimensionally (3D) and in the axial direction. Results The "adhesive" group had the greatest mean 3D shrinkage vector lengths and upward movement (31.1 +/- 10.9 mu m;- 13.7 +/- 12.1 mu m), followed by the "diverging" (27.4 +/- 12.1 mu m;- 5.7 +/- 17.2 mu m) and "cylindrical" groups (23.3 +/- 11.1 mu m;- 3.7 +/- 13.6 mu m);all groups differed significantly (p < 0.001 for each comparison, one-way ANOVA, Tamhane's T2). Conclusion The values and direction of the shrinkage vectors as well as interfacial debonding varied according to the cavity configuration.
| Item Type: | Journal article |
|---|---|
| Faculties: | Medicine |
| Subjects: | 600 Technology > 610 Medicine and health |
| ISSN: | 1432-6981 |
| Language: | English |
| Item ID: | 65154 |
| Date Deposited: | 19. Jul 2019, 12:16 |
| Last Modified: | 04. Nov 2020, 13:45 |
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