Chutima Asavapanumas1, Chalermpol Leevailoj. 1. Esthetic Restorative and Implant Dentistry, Faculty of Dentistry, School of Dentistry, Chulalongkorn University, Bangkok 10330, Thailand. chutimayyy@hotmail.com
Abstract
STATEMENT OF PROBLEM: As a result of natural tooth anatomy or gingival recession, anterior teeth are more likely to present increased abutment finish line curvature. PURPOSE: The purpose of this study was to investigate the influence of the curvature of the finish line on the marginal gap widths of ceramic copings. MATERIAL AND METHODS: An ivorine maxillary central incisor was prepared for 3 different abutment finish line curvatures (1, 3, and 5 mm). Thirty-six copings were fabricated for each of these curvatures by using Cercon, IPS e.max, and Lava systems. The marginal gap width was measured by using a stereomicroscope, and the data were subsequently analyzed by means of a 2-way ANOVA and a 1-way ANOVA (α=.05). RESULTS: A significantly higher mean marginal gap width was found for the 5-mm curvature group (Cercon, 76.59 ±23.01 µm; IPS e.max, 106.44 ±18.48 µm; Lava, 128.34 ±20.79 µm) than for both the 3-mm curvature group (Cercon, 60.18 ±9.74 µm; IPS e.max, 81.79 ±16.20 µm; Lava, 99.19 ±15.32 µm) and the 1-mm curvature group (Cercon, 38.3 ±6.85 µm; IPS e.max, 52.22 ±10.66 µm; Lava, 69.99 ±6.77 µm). CONCLUSIONS: The greater the finish line curvature, the wider the marginal gap widths for the 3 ceramic systems.
STATEMENT OF PROBLEM: As a result of natural tooth anatomy or gingival recession, anterior teeth are more likely to present increased abutment finish line curvature. PURPOSE: The purpose of this study was to investigate the influence of the curvature of the finish line on the marginal gap widths of ceramic copings. MATERIAL AND METHODS: An ivorine maxillary central incisor was prepared for 3 different abutment finish line curvatures (1, 3, and 5 mm). Thirty-six copings were fabricated for each of these curvatures by using Cercon, IPS e.max, and Lava systems. The marginal gap width was measured by using a stereomicroscope, and the data were subsequently analyzed by means of a 2-way ANOVA and a 1-way ANOVA (α=.05). RESULTS: A significantly higher mean marginal gap width was found for the 5-mm curvature group (Cercon, 76.59 ±23.01 µm; IPS e.max, 106.44 ±18.48 µm; Lava, 128.34 ±20.79 µm) than for both the 3-mm curvature group (Cercon, 60.18 ±9.74 µm; IPS e.max, 81.79 ±16.20 µm; Lava, 99.19 ±15.32 µm) and the 1-mm curvature group (Cercon, 38.3 ±6.85 µm; IPS e.max, 52.22 ±10.66 µm; Lava, 69.99 ±6.77 µm). CONCLUSIONS: The greater the finish line curvature, the wider the marginal gap widths for the 3 ceramic systems.
Authors: Peter Gehrke; Simon Burg; Ulrike Peters; Thomas Beikler; Carsten Fischer; Frank Rupp; Ernst Schweizer; Paul Weigl; Robert Sader; Ralf Smeets; Sogand Schäfer Journal: Clin Oral Investig Date: 2021-08-16 Impact factor: 3.573