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Effect of Resin Cement Mixing Method on the Retention Strength of a CAD/CAM Zirconia Crowns

  • Original Article
  • Published:
The Journal of Indian Prosthodontic Society

Abstract

Several treatments have been suggested to improve the retention of zirconia-based restorations luted with different cements. Resin cements are believed to improve crown retention under certain circumstances. The aim of the present study was to examine the effect of three cements with different mixing methods on the retention of CAD/CAM zirconia crowns. Thirty extracted human molars were randomly divided into three groups and prepared for all-ceramic crowns (6° taper, 4-mm height and a 1.2 mm rounded shoulder finish line). A zirconia crown (Tizian CAD/CAM) was fabricated for each tooth. The crowns were air-abraded using airborne particles, adjusted, and cemented to the corresponding tooth with one of the following cements: Panavia F2 (PAN group), RelyX Unicem (UNH group) or RelyX Unicem Aplicap (UNA group). After 3,000 rounds of thermal cycling, retention was measured using a specific retentive jig and a universal testing machine. The retention strength was measured by dividing the retention force by the surface area of each tooth. The means of the pull-out test results for each group were compared using analysis of variance and Tukey’s HSD test (α = 0.05). The mode of failure was examined using a stereomicroscope. The mean retention value was 6.45 (0.34) MPa for the UNA group, 4.99 MPa (0.47) for the UNH group, and 4.45 (0.39) for the PAN group; the differences among the three test groups were significant. A mixed failure was observed in 83.3 % of specimens, while no cohesive failure occurred in the crowns. Within the limitations of the present study, of the three tested cements, Relyx Unicem Aplicap cement was associated with the highest retention force for Tizian zirconia crowns.

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Acknowledgments

This research was an undergraduate dissertation and partly funded by Vice Chancellor for Research at Tehran University off Medical Sciences.

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Authors and Affiliations

  1. Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, Kargar Shomali, Hakim Hwy, 143995991, Tehran, Iran

    Leyla Sadighpour, Akbar Fazel & Mahdi Allahdadi

  2. Dental Implant Research Center, Tehran University of Medical Sciences, Kargar Shomali, Hakim Hwy, 143995991, Tehran, Iran

    Farideh Geramipanah

Authors
  1. Leyla Sadighpour
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  2. Akbar Fazel
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  3. Farideh Geramipanah
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  4. Mahdi Allahdadi
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Correspondence to Farideh Geramipanah.

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Sadighpour, L., Fazel, A., Geramipanah, F. et al. Effect of Resin Cement Mixing Method on the Retention Strength of a CAD/CAM Zirconia Crowns. J Indian Prosthodont Soc 14 (Suppl 1), 31–36 (2014). https://doi.org/10.1007/s13191-014-0355-1

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  • DOI: https://doi.org/10.1007/s13191-014-0355-1

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