Marginal adaptation of different monolithic zirconia crowns with horizontal and vertical finish lines: A comparative in vitro study

Marginal adaptation of different monolithic zirconia crowns with horizontal and vertical finish lines: A comparative in vitro study

This study evaluated the influence of different tooth preparation techniques and zirconia materials on marginal adaptation. Forty-eight healthy human maxillary first premolars were divided into two primary groups based on preparation design: group A (chamfer) and group B (vertical). Within each main...

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Bibliographic Details
Published in:Journal of dental research, dental clinics, dental prospects Vol. 17; no. 4; pp. 235 - 241
Main Authors: Nasir, Mohammed Qasim, Kadhim, Alaa Jawad
Format: Journal Article
Language:English
Published: Iran Tabriz University of Medical Sciences 2023
Subjects:
Adaptation
chamfer
Dehydration
Dental crowns
Dental restorative materials
Dentistry
Fractures
marginal gap
monolithic
Original
Sample size
Teeth
Thymol
Variance analysis
vertical
Zirconia
Germany
Liechtenstein
Vertical
Zirconia
Chamfer
Marginal gap
Monolithic
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Summary:This study evaluated the influence of different tooth preparation techniques and zirconia materials on marginal adaptation. Forty-eight healthy human maxillary first premolars were divided into two primary groups based on preparation design: group A (chamfer) and group B (vertical). Within each main group, there were three subgroups, comprising eight teeth each, distinguished by the type of zirconia material employed (Zircad LT, MT, and Prime by Ivoclar Vivadent). All the samples were prepared by the same operator using a dental surveyor. Intraoral scanning was performed on the prepared teeth. SironaInLab CAD 20.0 software was used to design crowns, which were subsequently generated using a 5-axis milling machine. The crowns were cemented to their respective teeth with self-adhesive resin cement. Marginal gap measurements were taken in micrometers (μm) before and after cementation at 16 sites per sample using a digital microscope at×230 magnification. The collected data were evaluated using statistical analysis using the independent t-test, paired t-test, and ANOVA at an 0.05 significance level. The vertical preparation group exhibited the smallest marginal gap, while the chamfer group displayed the largest. This disparity was statistically significant ( <0.05) for pre- and post-cementation measurements across all materials. There were no significant differences between the different monolithic zirconia crowns. The vertical preparation design illustrated significantly better marginal adaptation than the chamfer preparation design. Comparisons between materials showed comparable marginal gaps. The mean values of the marginal gaps in all groups increased significantly after cementation.
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content type line 23
ISSN:2008-210X
2008-2118
DOI:10.34172/joddd.2023.40589