Journal article
Shear bond strength of porcelain to a new millable alloy and a conventional castable alloy
The Journal of prosthetic dentistry, Vol.113(4), pp.329-335
04/01/2015
DOI: 10.1016/j.prosdent.2014.09.016
PMID: 25681353
Abstract
A recently introduced presintered cobalt-chromium (Co-Cr) alloy for metal ceramic restorations can be efficiently processed with computer-aided design/computer-aided manufacturing (CAD/CAM) techniques. However, little or no reliable study data are available regarding the bonding ability of porcelain to milled Co-Cr alloys.
The purpose of this study was to evaluate the shear bond strength of veneering porcelain to the presintered Co-Cr alloy and to a conventional castable alloy.
Ninety-six cylindrical cores (6.8 mm in diameter, 9 mm in height) were made of millable alloy (Ceramill Sintron) and castable alloy (4-all) by means of CAD/CAM or casting, 48 cores for each alloy. Four types of veneering porcelain were fired or pressed to the cores; these specimens had dimensions of 4×4×3 mm. After firing, the specimens were put in resin molds, fixed in a universal testing machine, and subjected to a shear force test. Loading was applied to each specimen through the attached crosshead at a constant drive speed of 0.5 mm/min until fracture occurred. Shear bond strengths (MPa) were calculated by dividing the maximum failure force over the cross-sectional area of each specimen. Failure patterns of the specimens were also investigated and characterized as adhesive, cohesive, or mixed. One-way ANOVA and the Duncan post hoc test were used to analyze statistically significant differences between groups (α=.05).
The means of the shear bond strengths of (millable) Ceramill Sintron were similar to or higher than those of (castable) 4-all cores. The shear bond strength was significantly lower for Press-To-Metal veneer than for the other fired veneers in the test (P<.001). The pattern of failure in most specimens was mixed, except for Press-To-Metal veneer, where cohesive failure occurred.
The bonding ability of the traditional castable alloy was similar to that of the presintered millable Co-Cr alloy.
Details
- Title: Subtitle
- Shear bond strength of porcelain to a new millable alloy and a conventional castable alloy
- Creators
- Du-Hyeong Lee - Kyungpook National UniversityBeom-Jun Lee - Kyungpook National UniversitySung-Hun Kim - Seoul National UniversityKyu-Bok Lee - Kyungpook National University
- Resource Type
- Journal article
- Publication Details
- The Journal of prosthetic dentistry, Vol.113(4), pp.329-335
- DOI
- 10.1016/j.prosdent.2014.09.016
- PMID
- 25681353
- NLM abbreviation
- J Prosthet Dent
- ISSN
- 0022-3913
- eISSN
- 1097-6841
- Language
- English
- Date published
- 04/01/2015
- Academic Unit
- Prosthodontics
- Record Identifier
- 9984914145702771
Metrics
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