The effect of immediate dentin sealing on fracture resistance and failure modes of resin composite onlay restorations
DOI:
https://doi.org/10.5577/intdentres.510Keywords:
Onlays, fracture strength, immediate dentin sealing, composite resinAbstract
Aim: This study aimed to investigate the fracture resistance, failure modes, and reparability of molars restored with laboratory-processed resin composite (Ceramage, SHOFU Inc., Kyoto, Japan) onlays above or below the cemento-enamel junction (CEJ) in the presence or absence of immediate dentin sealing (IDS).
Methodology: Forty extracted sound human molars were selected and divided into four groups: 1) Below CEJ with IDS, 2) Below CEJ without IDS, 3) Above CEJ with IDS, and 4) Above CEJ without IDS. Standardized mesio-occlusal (MO) onlay preparations were made with the reduction of mesio-buccal and mesio-palatinal cusps. Butt-joint preparation was used in the proximal box area extending 1 mm below the CEJ (Groups 1 and 2) or 1 mm above the CEJ (Groups 3 and 4). In Groups 1 and 3, IDS was applied immediately after tooth preparation. After cementation (Variolink N, Ivoclar Vivadent AG, Schaan, Liechtenstein), the specimens were thermally aged (20000 cycles, 5–55 ºC) and then subjected to load to failure (1 mm/min). The failure types and reparability of the onlays were recorded, and the data were analyzed using two-way ANOVA and Fisher’s exact tests.
Results: The restorations in Group 4 showed the highest mean fracture strength compared to Group 1 (p=0.038), Group 2 (p=0.008), and Group 3 (p=0.019). The interaction between the level of proximal extension and the presence of IDS did not influence fracture mode or reparability (p>0.05).
Conclusion: No difference in the fracture strength of resin composite onlays below CEJ with or without IDS was found; however, not using IDS for resin composite onlays above CEJ appears to be preferable.
How to cite this article:
Gözetici Çil B, Köymen SS, Ünal S, Dönmez N. The effect of immediate dentin sealing on fracture resistance and failure modes of resin composite onlay restorations. Int Dent Res 2024;14(1):27-33. https://doi.org/10.5577/intdentres.510
Downloads
Published
Issue
Section
Categories
License
Copyright © 2024 International Dental Research
This work is licensed under a Creative Commons Attribution 4.0 International License.
This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
