TY - JOUR
AR - DOBCR-2018-3-101
TI - The effect of glass transition on the bond strength at the interface between denture teeth and denture base
AU - Fengyuan , Zheng
AU - Mostafa  , Ibrahim
JO - Dental Oral Biology and Craniofacial Research
PY - 2018
DA - Thu 27, Sep 2018
SN - 2613-4950
DO - http://dx.doi.org/10.31487/j.DOBCR.2018.03.001
UR - https://www.sciencerepository.org/improved-denture-teeth-bonding-with-secondary-heat_DOBCR-3-101 
KW - Glass transition temperature, polymer blending, shear strength, polymethylmethacrylate
AB - 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.