| Summary: | The study aimed to compare shrinkage displacements of fully and partially bonded resin composite restorations (RCRs). Two groups (n=5) Class-I RCR evaluated: Group 1 (G1) fully bonded and Group 2 (G2) debonded at the floor. Experimental results were compared with predictions from simple theory and finite element analysis (FEA). The experimental linear surface displacement (LSD) was G1 62.5 +/- 5.2 mu m and G2 32.8 +/- 4.0 mu m. Theoretically-predicted LSD for G1 60.1 +/- 7.4 mu m and G2 31.3 +/- 7.5 mu m. FEA-predicted LSD were G1 65.2 mu m and G2 34.6 mu m. The experimental volumetric surface displacement (VSD) was G1 1.22 +/- 0.2 mm(3) and G2 0.63 +/- 0.2 mm(3). Theoretically-predicted VSD for G1 1.36 +/- 0.2 mm(3) and G2 0.67 +/- 0.2 mm(3). No significant difference (p > 0.05) was found in LSD and VSD among the experimental, theoretical and FEA in the same group. Significant differences (p < 0.05) were noted between the two groups, with LSD and VSD of G2 values being almost half of G1. This pattern gave an insight of a debond restoration characteristics.
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