Related Experiment Videos
Photoelastic stress analysis in a pier retainer of an anterior resin-bonded fixed partial denture
H M Ziada1, J F Orr, I C Benington
1University Dental School and Hospital, University College Cork, Cork, Ireland.
Statement Of Problem:
A clinical situation may arise with 2 edentulous spaces and a single intact pier tooth. A dentist may restore these edentulous spaces with a long span resin-bonded fixed partial denture using the pier and the 2 terminal abutments for bonding.
Purpose:
This study analyzed the stresses induced in a pier retainer of an anterior resin-bonded fixed partial denture and determined the effect on a pier abutment.
Material And Methods:
Photoelastic materials were selected to represent the relative stiffness of 3- and 5-unit resin-bonded fixed partial dentures. The models were scaled to x2.5 to enhance visual analysis of the stress pattern.
Results:
Isochromatic fringes indicated a stress magnitude at the proximolingual areas of the pontic in the 3-unit resin-bonded fixed partial denture. In the 5-unit resin-bonded prosthesis, the stress pattern appeared to involve the entire surface of the pier retainer.
Conclusion:
The use of pier abutments should be avoided and it is more favorable to use 3-unit resin-bonded fixed partial dentures.