The effect of glass transition on the bond strength at the interface between denture teeth and denture base

Author Info

Fengyuan Zheng Mostafa Ibrahim

Corresponding Author

Fengyuan Zheng
Advanced Prosthodontics Program, College of Dentistry, The Ohio State University, Columbus, Ohio

A B S T R A C T

The bond strength at the interface between denture teeth and denture base was studied under conventional processing and additional secondary heat above glass transition temperature. Twenty denture teeth were processed with heat activated denture base material with conventional compression molding technique. 10 specimens were exposed to the additional secondary heat treatment above the glass transition temperature, at 120°C for 45 minutes, while other 10 specimens were stored in the water at room temperature. All specimens were retrieved from the flasks and subjected to oblique shear force to fracture and the load of failure was reported as the bond strength. Data were analyzed by one-way ANOVA. The secondary heat treatment above glass transition temperature resulted in a significantly increased bond strength between the denture teeth and the denture base (p<0.05). The load to failure of conventionally processed group was 259±40 N and the secondary heat-treated group was 313±33 N. In addition, the failure mode on the denture teeth-base interface with conventional processing was adhesive failure while cohesive failure within the denture base was observed on the secondary heat-treated group. Within limitations of this study, it can be concluded that secondary heat treatment above glass transition temperature can significantly increase the bond strength of conventionally processed denture teeth-base interface.

Article Info

Article Type

Research Article

Publication history

Received: Sun 12, Aug 2018
Accepted: Mon 03, Sep 2018
Published: Thu 27, Sep 2018

Copyright

© 2023 Fengyuan Zheng. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Hosting by Science Repository.
DOI: 10.31487/j.DOBCR.2018.03.001