The Journal of Advanced Prosthodontics

The Korean Academy of Prosthodonitics (대한치과보철학회)
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Assessment of effect of accelerated aging on interim fixed dental materials using digital technologies

  • Omar, Alageel (Dental Health Department, College of Applied Medical Sciences, King Saud University) ;
  • Omar, Alsadon (Dental Health Department, College of Applied Medical Sciences, King Saud University) ;
  • Haitham, Almansour (Dental Health Department, College of Applied Medical Sciences, King Saud University) ;
  • Abdullah, Alshehri (Dental Health Department, College of Applied Medical Sciences, King Saud University) ;
  • Fares, Alhabbad (Dental University Hospital, King Saud University Medical City) ;
  • Majed, Alsarani (Dental Health Department, College of Applied Medical Sciences, King Saud University)
  • Received : 2022.08.22
  • Accepted : 2022.11.18
  • Published : 2022.12.31
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Abstract

PURPOSE. This study assessed the physical and mechanical properties of interim crown materials fabricated using various digital techniques after accelerated aging. MATERIALS AND METHODS. Three groups of interim dental restorative materials (N = 20) were tested. The first group (CO) was fabricated using a conventional manual method. The second group (ML) was prepared from prefabricated resin blocks for the milling method and cut into specimen sizes using a cutting disc. The third group (3D) was additively manufactured using a digital light-processing (DLP) 3D printer. Aging acceleration treatments using toothbrushing and thermocycling simulators were applied to half of the specimens corresponding to three years of usage in the oral environment (N = 10). Surface roughness (Ra), Vickers microhardness, 3-point bending, sorption, and solubility tests were performed. A 2-way analysis of variance (ANOVA) and Fisher's multiple comparison test were used to compare the results among the groups. RESULTS. The mean surface roughness (Ra) of the resin after accelerated aging was significantly higher in the CO and ML groups than that before aging, but not in the 3D group. All groups showed reduced hardness after accelerated aging. The flexural strength values were highest in the 3D group, followed by the ML and CO groups after accelerated aging. Accelerated aging significantly reduced water sorption in the ML group. CONCLUSION. According to the tested material and 3D printer type, both 3D-printed and milled interim restoration resins showed higher flexural strength and modulus, and lower surface roughness than those prepared by the conventional method after accelerated aging.

Keywords

Acknowledgement

The authors extend their appreciation to the Deputyship for Research & Innovation, Ministry of Education in Saudi Arabia for funding this research work through the project no. (IFKSURG-2-072). We would also like to extend our gratitude to the Almeswak Digital Laboratory, Riyadh, Saudi Arabia, for preparing the 3D-printed specimens used in this study.

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