Ji-Hee Park1, Sangwon Park2, Kwangmin Lee3, Kwi-Dug Yun4, Hyun-Pil Lim5. 1. Graduate student, Department of Prosthodontics, School of Dentistry, Chonnam National University, Gwangju, Korea. 2. Professor, Department of Prosthodontics, School of Dentistry, Dental 4D Research Institute, Chonnam National University, Gwangju, Korea. 3. Professor, Department of Materials Science and Engineering, College of Engineering, Chonnam National University, Gwangju, Korea. 4. Assistant Professor, Department of Prosthodontics, School of Dentistry, Dental 4D Research Institute, Chonnam National University, Gwangju, Korea. 5. Assistant Professor, Department of Prosthodontics, School of Dentistry, Dental 4D Research Institute, Chonnam National University, Gwangju, Korea. Electronic address: mcnihil@jnu.ac.kr.
Abstract
STATEMENT OF PROBLEM: Little clinical information exists on the antagonist wear of anatomic contour zirconia crowns. PURPOSE: The purpose of this in vitro study was to evaluate the 2-body wear of antagonists for 3 computer-aided design and computer-aided manufacturing (CAD/CAM) anatomic contour zirconia ceramics and veneering porcelain when opposing natural human enamel. MATERIAL AND METHODS: Zirkonzahn Y-TZP (polished zirconia, zirconia with staining, zirconia with staining and glazing), Acucera Y-TZP, Wieland Y-TZP, and Noritake feldspathic ceramic were tested (6 groups). Eight disk-shaped specimens 15 mm in diameter and 5 mm thick were prepared for each group. Forty-eight specimens were fabricated for a wear test against maxillary premolars without caries or previous restorations with 240 000 masticatory cycles in a masticatory simulator. Before the experiment, the surface roughness of each ceramic was measured with a nanosurface 3-dimensional (3D) optical profiler. The surface of the specimens was observed at 50× and 1000× magnification with a field emission scanning electron microscope (FE-SEM) before and after the experiment. The data obtained were statistically analyzed by 1-way ANOVA and the Tukey test for post hoc analysis (α=.05). RESULTS: The SEM observations of each group revealed fine bubbles and porous surfaces in the Noritake feldspathic ceramic group, whereas the polished Zirkonzahn Y-TZP group, Acucera Y-TZP group, and Wieland Y-TZP group had smooth surfaces. The surface roughness of Zirkonzahn Y-TZP after staining and glazing was significantly greater than that of any other groups (P<.01). The tooth opposing the polished Zirkonzahn Y-TZP group demonstrated the least wear (1.11 ± 0.51 mm³), while Zirkonzahn Y-TZP with staining and glazing produced the greatest enamel wear (3.07 ± 0.98 mm³) among the zirconia groups. The Noritake feldspathic ceramic group showed significantly more antagonistic tooth wear than other groups (P<.05). CONCLUSIONS: The antagonist wear of 3 CAD/CAM anatomic contour zirconia ceramics was significantly less than the Noritake veneering ceramic because the surface character of Y-TZP is relatively uniform and homogeneous. Zirkonzahn Y-TZP with staining and glazing was significantly more abrasive than the other zirconia specimens tested. However, it was less abrasive than the Noritake veneering ceramic.
STATEMENT OF PROBLEM: Little clinical information exists on the antagonist wear of anatomic contour zirconia crowns. PURPOSE: The purpose of this in vitro study was to evaluate the 2-body wear of antagonists for 3 computer-aided design and computer-aided manufacturing (CAD/CAM) anatomic contour zirconia ceramics and veneering porcelain when opposing natural human enamel. MATERIAL AND METHODS:Zirkonzahn Y-TZP (polished zirconia, zirconia with staining, zirconia with staining and glazing), Acucera Y-TZP, Wieland Y-TZP, and Noritake feldspathic ceramic were tested (6 groups). Eight disk-shaped specimens 15 mm in diameter and 5 mm thick were prepared for each group. Forty-eight specimens were fabricated for a wear test against maxillary premolars without caries or previous restorations with 240 000 masticatory cycles in a masticatory simulator. Before the experiment, the surface roughness of each ceramic was measured with a nanosurface 3-dimensional (3D) optical profiler. The surface of the specimens was observed at 50× and 1000× magnification with a field emission scanning electron microscope (FE-SEM) before and after the experiment. The data obtained were statistically analyzed by 1-way ANOVA and the Tukey test for post hoc analysis (α=.05). RESULTS: The SEM observations of each group revealed fine bubbles and porous surfaces in the Noritake feldspathic ceramic group, whereas the polished Zirkonzahn Y-TZP group, Acucera Y-TZP group, and Wieland Y-TZP group had smooth surfaces. The surface roughness of Zirkonzahn Y-TZP after staining and glazing was significantly greater than that of any other groups (P<.01). The tooth opposing the polished Zirkonzahn Y-TZP group demonstrated the least wear (1.11 ± 0.51 mm³), while Zirkonzahn Y-TZP with staining and glazing produced the greatest enamel wear (3.07 ± 0.98 mm³) among the zirconia groups. The Noritake feldspathic ceramic group showed significantly more antagonistic tooth wear than other groups (P<.05). CONCLUSIONS: The antagonist wear of 3 CAD/CAM anatomic contour zirconia ceramics was significantly less than the Noritake veneering ceramic because the surface character of Y-TZP is relatively uniform and homogeneous. Zirkonzahn Y-TZP with staining and glazing was significantly more abrasive than the other zirconia specimens tested. However, it was less abrasive than the Noritake veneering ceramic.
Authors: J F Esquivel-Upshaw; M J Kim; S M Hsu; N Abdulhameed; R Jenkins; D Neal; F Ren; A E Clark Journal: J Dent Date: 2017-10-16 Impact factor: 4.379
Authors: Marina R Kaizer; Petra C Gierthmuehlen; Mateus Bf Dos Santos; Sergio S Cava; Yu Zhang Journal: Ceram Int Date: 2017-05-19 Impact factor: 4.527
Authors: Hafiz Muhammad Arshad; Amir Shahzad; Sammia Shahid; Sadaqat Ali; Abdul Rauf; Shahzad Sharif; Muhammad Ehsan Ullah; Muhammad Inam Ullah; Muhammad Ali; Hafiz Ishfaq Ahmad Journal: Biomed Res Int Date: 2022-09-13 Impact factor: 3.246