Influence of Surface Modifications of Acrylic Resin Teeth on Shear Bond Strength with Denture Base Resin-An Invitro Study.
BACKGROUND
Debonding of artificial teeth from the denture base is an important issue for edentulous patients rehabilitated with conventional or implant supported complete dentures.


OBJECTIVE
The purpose of this study was to evaluate shear bond strength between denture base resin and acrylic resin denture teeth subjected to three different surface modifications on the ridge lap area as compared to unmodified denture teeth.


METHODS
Forty acrylic resin central incisor denture teeth were selected and randomly divided into four test groups. The teeth in each group were subjected to one of the three different surface modifications, namely, chemical treatment, sandblasting and placement of retentive grooves on the ridge lap area respectively, prior to packing of the denture base resin. The group with unmodified teeth served as control. Forty acrylic resin test blocks thus obtained were tested for shear bond strength between acrylic resin teeth and denture base resin in Universal Testing Machine. Data obtained was statistically analysed using one-way ANOVA and Student- Newman- Keul's test (p< 0.05).


RESULTS
Analysis of shear bond strength revealed that retentive grooves on the ridge lap area showed highest bond strength values followed by sandblasting and both were statistically significant compared to the control and chemically treated groups. Unmodified surface of the resin teeth showed the least bond strength.


CONCLUSIONS
Within the limitations of this invitro study the placement of retentive grooves or sandblasting of the ridge lap area showed highly significant improvement in shear bond strength compared to the unmodified surface. Chemical treatment did not result in any significant improvement in the shear bond strength compared to the unmodified surface.
Reader, Department of Prosthodontics & Implantology, Ragas Dental College & Hospital , Chennai, India .
Vallabh
V
Mahadevan
Professor, Department of Prosthodontics & Implantology, Ragas Dental College & Hospital , Chennai, India .
Madhusudan
M
Krishnan
Professor, Department of Prosthodontics & Implantology, Ragas Dental College & Hospital , Chennai, India .
Chitra Shankar
CS
Krishnan
Professor and HOD, Department of Prosthodontics & Implantology, Ragas Dental College & Hospital , Chennai, India .
N S
NS
Azhagarasan
Professor, Department of Prosthodontics & Implantology, Ragas Dental College & Hospital , Chennai, India .
Jayakrishnakumar
J
Sampathkumar
Reader, Department of Prosthodontics & Implantology, Ragas Dental College & Hospital , Chennai, India .
Hariharan
H
Ramasubramanian
Artificial teeth; Denture teeth; Removable prostheses; Surface properties; Surface treatment