Influence of firing conditions and production methods on fracture strength of titanium-based metal ceramic crowns
Journal article, 2018

Objectives: This study evaluated the effect of argon atmosphere compared with vacuum during porcelain firing on the fracture strength of crowns made of porcelain and electron beam melted (EBM) Ti-6Al-4 V, cast commercially pure titanium or milled commercially pure titanium. Methods: Sixty crown copings of c. p. titanium, Ti-6Al-4 V alloy and porcelain were fabricated using three production techniques. The copings were fired either under vacuum or in an argon gas atmosphere. Specimens were subdivided into groups of cast c. p. titanium, milled c. p. titanium and EBM Ti-6Al-4 V which were further subdivided according to firing modes employing either vacuum or argon gas. The 60 specimens were subjected to cyclic preloading and thermocycling, and were then individually loaded until interface fractured. Differences between the group mean values were calculated using the one-way ANOVA and Tukey's range test. Two fractured samples from each group were cut with a diamond blade and examined using SEM and EDS for visualization and chemical composition analysis of the fractured interface. Results: The highest mean fracture strength values, though not significant, were recorded for the groups fired in argon atmosphere, and the lowest mean fracture strength values were recorded for the groups fired in vacuum, with one exception. Comparing the two main groups of firing atmosphere, no significant difference could be documented. SEM and EDS analysis indicated clear differences in composition and structure between the groups included in the study. Conclusions: Firing in argon atmosphere does not significantly improve the fracture strength of porcelain bonded to titanium.

argon

bond strength

dental ceramics

Titanium

dental porcelain

Author

P. Haag

Malmö university

F. Khan

Commercial Dental Laboratory

Martin Andersson

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

P. Vult von Steyern

Malmö university

Journal of Adhesion Science and Technology

0169-4243 (ISSN) 1568-5616 (eISSN)

Vol. 32 3 225-238

Subject Categories

Physiotherapy

Other Materials Engineering

Medical Materials

DOI

10.1080/01694243.2017.1352119

More information

Latest update

12/2/2021