Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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The effect of preheating resin composites on surface hardness: a systematic review and meta-analysis

  • Elkaffas, Ali A. (Department of Operative Dentistry, Faculty of Dentistry, Mansoura University) ;
  • Eltoukhy, Radwa I. (Department of Operative Dentistry, Faculty of Dentistry, Mansoura University) ;
  • Elnegoly, Salwa A. (Department of Operative Dentistry, Faculty of Dentistry, Mansoura University) ;
  • Mahmoud, Salah H. (Department of Operative Dentistry, Faculty of Dentistry, Mansoura University)
  • Received : 2019.02.23
  • Accepted : 2019.10.04
  • Published : 2019.11.30
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Abstract

Objectives: This paper presents a systematic review and meta-analysis of the effect of preheating on the hardness of nanofilled, nanoceramic, nanohybrid, and microhybrid resin composites. Materials and Methods: An electronic search of papers on MEDLINE/PubMed, ScienceDirect, and EBSCOhost was performed. Only in vitro studies were included. Non-English studies, case reports, clinical trials, and review articles were excluded. A meta-analysis of the reviewed studies was conducted to quantify differences in the microhardness of the Z250 microhybrid resin composite using the Comprehensive Meta-Analysis software. Results: Only 13 studies met the inclusion criteria for this systematic review. The meta-analysis showed that there were significant differences between the non-preheated and preheated modes for both the top and bottom surfaces of the specimens (p < 0.05). The microhardness of the Z250 resin composite on the top surface in the preheated mode (78.1 ± 2.9) was higher than in the non-preheated mode (67.4 ± 4.0; p < 0.001). Moreover, the microhardness of the Z250 resin composite on the bottom surface in the preheated mode (71.8 ± 3.8) was higher than in the non-preheated mode (57.5 ± 5.7, p < 0.001). Conclusions: Although the results reported in the reviewed studies showed great variability, sufficient scientific evidence was found to support the hypothesis that preheating can improve the hardness of resin composites.

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References

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