Comparison of marginal adaptation and internal fit of monolithic lithium disilicate crowns produced by 4 different CAD/CAM systems

Author(s)

Ferrairo, Brunna Mota ^[1] ; Piras, Fernanda Furtado ^[2] ; Lima, Feranda Ferruzzi ^{[3, 4]} ; Honorio, Heitor Marques ^[5] ; Hungaro Duarte, Marco Antonio ^[6] ; Sanches Borges, Ana Flavia ^[6] ; Rubo, Jose Henrique ^[1]

Affiliation

^[1] Univ Sao Paulo, Bauru Sch Dent, Dept Prosthodont & Periodont, Alameda Doutor Octavio Pinheiro Brisolla 9-75, BR-17012901 Bauru, SP - Brazil

^[2] Univ Marilia UNIMAR, Fac Dent, Dept Prosthodont & Periodontol, Ave Higino Muzi Filho 1001, BR-17525902 Marilia, SP - Brazil

^[3] Univ Estadual Maringa, Dept Dent, Maringa, Parana - Brazil

^[4] Inga Univ Ctr UNINGA, Sch Dent, Dept Restorat Dent & Prosthodont, Maringa, Parana - Brazil

^[5] Univ Sao Paulo, Bauru Sch Dent, Dept Pediat Dent Orthodont & Publ Hlth, Alameda Doutor Octavio Pinheiro Brisolla 9-75, BR-17012901 Bauru, SP - Brazil

^[6] Univ Sao Paulo, Bauru Sch Dent, Dept Operat Dent Endodont & Dent Mat, Alameda Doutor Octavio Pinheiro Brisolla 9-75, BR-17012901 Bauru, SP - Brazil

• Document type: Journal article
• Source: CLINICAL ORAL INVESTIGATIONS; v. 25, n. 4 AUG 2020.
• Web of Science Citations: 0

Abstract

Objectives To evaluate the marginal adaptation and internal space of crowns produced by 4 CAD/CAM systems using microcomputed tomography (mu CT) and replica technique (RT). Materials and methods Monolithic lithium disilicate crowns were milled (Ceramill, Cerec, EDG, and Zirkonzahn) (n= 10). The cement film obtained with low viscosity silicone was scanned by the mu CT system and captured by a stereomicroscope, according to RT. Two-way ANOVA followed by Tukey's test were used for statistical analysis (alpha= 0.05). A uniformity index (UI) was idealized to describe the distribution of crowns' internal space and submitted to the Kruskal-Wallis and Tukey's test (alpha= 0.05). The correlation between mu CT and RT was performed by Pearson's Correlation Coeficient (alpha = 0.05). Results Marginal adaptation and internal space were statistically significant different between the experimental groups for the mu CT and RT (p< 0.05). The medians of the 4 systems tested were within clinically acceptable range and the mean (+/- SD) highest marginal discrepancy was recorded in the Ceramill group at 133.0 +/- 71.5 mu m (mu CT) and 90.6 +/- 38.5 mu m (RT). For internal fit, the UI disclosed a better distribution of the internal space for the Zirkonzahn group (p< 0.001). There was a strong correlation between the methods (p= 0.01 andr= 0.69). (AU)

• FAPESP's process: 13/10021-5 - Reliability, failure modes and fit of prosthetic single crowns
• Grantee: José Henrique Rubo
• Support Opportunities: Regular Research Grants