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CC BY 4.0 · Eur J Dent 2022; 16(02): 307-314
DOI: 10.1055/s-0041-1735433
Original Article

Effect of Stress Generated by Occlusal Cyclic Force on Class I Bulk-Fill Composite Restoration Microleakage

Apirat Ritthiti
1   Department of Conservative Dentistry, Faculty of Dentistry, Srinakharinwirot University, Bangkok, Thailand
,
Vanthana Sattabanasuk
2   Department of Operative Dentistry and Endodontic, Faculty of Dentistry, Mahidol University, Bangkok, Thailand
,
Kavin Karunratanakul
3   Biomedical Engineering Research Unit, National Metal and Materials Technology Center, Bangkok, Thailand
,
Pisol Senawongse
2   Department of Operative Dentistry and Endodontic, Faculty of Dentistry, Mahidol University, Bangkok, Thailand
› Author Affiliations Funding This study was supported by the Faculty of Dentistry, Mahidol University.
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Abstract

Objective This study aimed to evaluate the effects of different types and restorative techniques of Class I composite restorations with a single loading force on stress distribution and cyclic loading force on microleakage formation.

Materials and Methods Class I cavities were prepared in premolars with 4 mm depth and divided into six groups of different restorations with: (1) Filtek Z250; (2) a 3-mm-thick layer of Filtek Bulk Fill Flowable Restoration and covered with Z250; (3) a 1.5-mm-thick layer of flowable composite and covered with Z250; (4) lining all cavity with flowable composite and restored with Z250; (5) Filtek Bulk Fill Posterior Restoration; and (6) lining all cavity with flowable composite and restored with bulk-fill composite. The specimens with and without cyclic occlusal loading were subjected to microleakage observation. In addition, six different models of Class I restorations corresponding to the microleakage study were generated. Finite element analysis (FEA) was used to identify the stress distribution under a single loading force.

Statistical Analysis Data were statistically analyzed by two-way analysis of variance and multiple comparison. The significance level set at 0.05.

Results Cavity lining or restoration with flowable composite underneath conventional composite reduced stress on composite resin based on FEA (groups 2 and 3). The cyclic stress on composite increased microleakage. Restoration with flowable composite underneath conventional composite reduced the microleakage in Class I restoration (groups 2, 3, and 4).

Conclusion The most effective cavity lining with a flowable composite underneath conventional composite restoration was stress reduction under loading force resulting in microleakage reduction.

Keywords

composite restoration - cyclic loading - finite element - microleakage - occlusal force - stress


Publication History

Article published online:
21 October 2021

© 2021. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/)

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