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. 2021 Sep 12;14(18):5242.
doi: 10.3390/ma14185242.

Base Materials' Influence on Fracture Resistance of Molars with MOD Cavities

Gabriela Ciavoi  1 , Ruxandra Mărgărit  2 , Liana Todor  1 , Dana Bodnar  2 , Magdalena Natalia Dina  3 , Daniela Ioana Tărlungeanu  4 , Denisa Cojocaru  5 , Cătălina Farcaşiu  6 , Oana Cella Andrei  4
Affiliations

Base Materials' Influence on Fracture Resistance of Molars with MOD Cavities

Gabriela Ciavoi et al. Materials (Basel). .

Abstract

The aim of this study was to compare fracture resistance of teeth presenting medium-sized mesial-occlusal-distal (MOD) cavities using different base materials. Thirty-six extracted molars were immersed for 48 h in saline solution (0.1% thymol at 4 °C) and divided into six groups. In group A, the molars were untouched, and in group B, cavities were prepared, but not filled. In group C, we used zinc polycarboxylate cement, in group D-conventional glass ionomer cement, in group E-resin modified glass ionomer cement, and in group F-flow composite. Fracture resistance was tested using a universal loading machine (Lloyd Instruments) with a maximum force of 5 kN and a crosshead speed of 1.0 mm/min; we used NEXYGEN Data Analysis Software and ANOVA Method (p < 0.05). The smallest load that determined the sample failure was 2780 N for Group A, 865 N for Group B, 1210 N for Group C, 1340 N for Group D, 1630 N for Group E and 1742 N for Group F. The highest loads were 3050 N (A), 1040 N (B), 1430 N (C), 1500 N (D), 1790 N (E), and 3320 N (F), the mean values being 2902 ± 114 N (A), 972 ± 65 N (B), 1339 ± 84 N (C), 1415 ± 67 N (D), 1712 ± 62 N (E), and 2334 ± 662 N (F). A p = 0.000195 shows a statistically significant difference between groups C, D, E and F. For medium sized mesial-occlusal-distal (MOD) cavities, the best base material regarding fracture resistance was flow composite, followed by glass ionomer modified with resin, conventional glass ionomer cement and zinc polycarboxylate cement. It can be concluded that light-cured base materials are a better option for the analyzed use case, one of the possible reasons being their compatibility with the final restoration material, also light-cured.

Keywords: base materials; fracture resistance; mesial-occlusal-distal (MOD) cavities.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
(a) Group of six molars unprepared; (b) group of six molars with MOD cavities; (c) group of samples prepared for testing; (d) universal loading machine; and (e) specimen before testing.
Figure 2
Figure 2
The maximum value of the force at which the most resistant molar from Group A failed.
Figure 3
Figure 3
The maximum value of the force at which the most resistant molar from Group B failed.
Figure 4
Figure 4
The maximum value of the force at which the most resistant molar from Group C failed.
Figure 5
Figure 5
The maximum value of the force at which the most resistant molar from Group D failed.
Figure 6
Figure 6
The maximum value of the force at which the most resistant molar from Group E failed.
Figure 7
Figure 7
The maximum value of the force at which the most resistant molar from Group F failed.
Figure 8
Figure 8
Result comparison for Groups C–F.
See this image and copyright information in PMC

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