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Comparison of the Marginal Fit of Pressable Ceramic to Metal Ceramic Restorations
Author(s) -
Holden Jason E.,
Goldstein Gary R.,
Hittelman Eugene L.,
Clark Elizabeth A.
Publication year - 2009
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/j.1532-849x.2009.00497.x
Subject(s) - ceramic , dentistry , post hoc , materials science , chamfer (geometry) , finish line , magnification , dental porcelain , orthodontics , significant difference , composite material , mathematics , medicine , geology , computer science , geometry , computer vision , statistics , paleontology , race (biology)
Purpose: The aim of this in vitro study was to compare the marginal adaptation of a pressed ceramic material, when used with and without a metal substructure, to a traditional feldspathic porcelain‐fused‐to‐metal restoration with a porcelain butt margin. Materials and Methods: A maxillary central incisor typodont tooth was prepared with a 1.5 mm 360° shoulder with rounded internal line angle, and 30 polyether impressions were made. Dies were poured in type IV dental stone, and 30 restorations were fabricated: 10 metal ceramic restorations (MCR) with porcelain butt joints, 10 pressed to metal restorations (PTM), and 10 all‐ceramic restorations (PCR). All restorations were evaluated on their respective dies at 45× magnification using an Olympus SZX‐12, measurements of the marginal openings were made, and ANOVA and Scheffé post hoc tests were used to evaluate the data. Results: The mean marginal opening was 72.2 ± 5.9 μm for MCR, 49.0 ± 5.9 μm for PTM, and 55.8 ± 5.9 μm for PCR. The post hoc tests showed that there was a statistical difference between the marginal adaptation of the PTM and MCR groups ( p < 0.05). There was no significant difference in marginal adaptation between the PTM and the PCR groups, or the PCR and the MCR groups. Conclusions: The PTM group demonstrated a smaller mean marginal opening than the MCR group. The mean marginal openings of all three groups were within a clinically acceptable range.