The affects of cement space thickness and material type with application of micro-CT scanner on marginal discrepancy of restoration

Authors

Mosharraf Mosharraf Professor, Dental Materials Research Center and Department of Prosthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran. https://orcid.org/0000-0002-2100-5754
Amir Azizi Department of Prosthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran https://orcid.org/0000-0001-7280-5500
Babak Naziri Department of Prosthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran https://orcid.org/0000-0003-1084-7558
Majid Abolhasani Associate Professor, Department of Prosthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran https://orcid.org/0000-0001-6764-6242

DOI:

https://doi.org/10.14295/bds.2021.v24i1.1968

Abstract

Objective: Studies demonstrated that as one of the newly developed restorative materials, monolithic zirconia resolved several issues of zirconia restoration. Therefore, marginal accuracy and internal fit are necessary for clinical success and quality of restorations, and cement space may influence the marginal fit. Thus, the present research aimed to investigate the effects of the cement thickness and kind of restoration on the marginal discrepancy. Material and methods: In this study, 20 maxillary left first molars, prepared by DRSK Co., were used to fabricate a full crown. Two types of material included monolithic zirconia (Zolid) and Sintron were used to make a full crown. Samples from each group were scanned by dental laboratory 3D scanner and designed and processed using CAD-CAM. The samples were divided into four groups of five with 30- and 50- µm cement spaces. In order to assess the vertical marginal discrepancy, the crowns were fitted on their respective teeth without using any mediator and examined by a micro-CT scanner. Data were analyzed by SPSS software. Results: It has been found that marginal discrepancy in Sintron is higher than the discrepancy of monolithic zirconia. In fact, monolithic zirconia with 50-micron cement space exhibited the least marginal discrepancy and the cement space in Sintron did not significantly influence the marginal discrepancy. Conclusion: It has been concluded that the material kinds and cement space influence the restoration marginal discrepancy constructed by digital workflow.

KEYWORDS
Dental cements; Dental marginal adaptation; X-Ray
microtomography.

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The affects of cement space thickness and material type with application of micro-CT scanner on marginal discrepancy of restoration

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