Modified rotation joint connection unite versus double akerclasp used forbracing of maxillary unilateral free end removable partial dentures (in vitro analysis of stresses on principle abutments and edentulous ridge)‎

الملخص EN

This study aimed to evaluate the stresses transmitted to the principal abutment teeth and residual ridge.

In maxillary class II Kennedy classification removable partial denture (RPD) using two different bracing designs on the tooth supported side used in conjunction with extra coronal attachment on the tooth tissue supported side.

Material and methods : Twenty duplicates of educational casts of maxillary class II Kennedy classification RPD were constructed.

According to the bracing design used, the casts were classified into two equal groups, each group consists of ten casts, Group I design with extra coronal attachment toward the tissue side and double Akers clasp on the tooth supported side.

Group II with extra coronal attachment toward the tooth tissue side and modified rotation joint in the intact side.

Strain gauges were used to record the micro stresses when a load of 60 N applied for both groups.

Results : the results showed that there was statistically highly significant differences for the recorded micro stresses for group II than group I on the principle abutments and the residual ridge from the buccopalatal and mesiodistal directions.

Conclusion : modified rotation joint connection unites is a promising bracing approach in the management of unmodified unilateral free end saddles.