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Odontology

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Comparative evaluation of the mechanical properties of CAD/CAM dental blocks

  • Ruizhi Yin
  • Yu-Kyoung Kim
  • Yong-Seok Jang
  • Jung-Jin Lee
  • Min-Ho Lee
  • Tae-Sung Bae
Original Article
  • 62 Downloads

Abstract

This study compares the mechanical properties of commercially available CAD/CAM (Computer-Aided Design/Computer-Aided Manufacturing) millable dental blocks including Vita Enamic, Lava Ultimate, and MAZIC Duro. All the discs were cut in dimension of 1.2 mm in thickness and 12 mm in diameter, ground up to #1200 Sic papers and polished. The biaxial flexure strength of the ceramic discs was measured after thermocycling treatment and the broken surfaces were observed using scanning electron microscopy (SEM). The discs were brushed using a toothbrush testing machine under a 150 g load. Surface roughness and morphology were determined after toothbrushing cycles. Finally, the friction and wear behavior of the materials against an opposing tooth were studied using a reciprocating pin-on-plate test configuration. The vertical loss of dental cusp was measured, and the surface image was examined using field emission scanning electron microscopy (FE-SEM). The biaxial flexural strength data were subjected to Weibull analysis. To compare the significance between the groups, all data were analyzed by one-way analysis (ANOVA). The biaxial flexural strength of the Lava Ultimate and MAZIC Duro materials is significantly higher than that of Vita Enamic. In addition, Lava Ultimate and MAZIC Duro exhibited significantly smoother surfaces than that of Vita Enamic after toothbrushing. Lava Ultimate and MAZIC Duro also showed less wear to the opposing tooth than that of Vita Enamic. In addition, Lava Ultimate possesses more suitable mechanical properties than the Vita Enamic and Mazic Duro for use in oral clinical prosthesis.

Keywords

Hybrid ceramic Nano-composite resin Biaxial flexural strength Surface roughness Wear test 

Notes

Acknowledgements

This research did not receive any specific Grant from funding agencies in the public, commercial, or not-for-profit sectors.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest.

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Copyright information

© The Society of The Nippon Dental University 2019

Authors and Affiliations

  1. 1.Department of Dental Biomaterials, School of DentistryChonbuk National UniversityJeonjuRepublic of Korea
  2. 2.Department of Prosthodontics, Institute of Oral Bio-Science, School of DentistryChonbuk National University and Research Institute of Clinical Medicine of Chonbuk National University-Biomedical Research Institute of Chonbuk National UniversityJeonjuRepublic of Korea

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