Stiffness of different designs and cross-sections of maxillary and mandibular major connectors of removable partial dentures.

Z. Ben-Ur*, E. Mijiritsky, C. Gorfil, T. Brosh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


STATEMENT OF PROBLEM: Major connectors of removable partial dentures must distribute forces bilaterally without damaging the supporting tissues. PURPOSE: This study investigated which design and cross-sectional shape of major connectors most favorably influence rigidity and flexibility. METHODS AND MATERIAL: Five designs for maxillary removable partial denture major connectors and 5 lingual bar major connectors of different cross-sectional forms were cast in chrome cobalt alloy on a master cast. Points M and P, which represented the position of the first premolar and second molar teeth, were positioned 20 mm apart on the casting. Vertical and horizontal forces were applied to each point while the opposite side was gripped in an Instron testing machine. A force-deflection curve was obtained for each loading point. Mean stiffness values were obtained for loading in compression and torsion. RESULTS: Values for torsional loading simulating vertical forces were lower when compared with values obtained for compression loading that simulated horizontal occlusal forces. Differences in stiffness were greater in mandibular major connectors loaded at M and P. The half pear-shaped cross section was the stiffest. CONCLUSIONS: In the maxillary arch, the most rigid major connector was the anteroposterior palatal bar combination placed on different horizontal and vertical planes. The most flexible was the U-shaped design. In the mandibular arch, the most important factor in achieving rigidity was the cross-sectional shape of the major connector. The half pear-shaped cross section proved to be the most rigid.

Original languageEnglish
Pages (from-to)526-532
Number of pages7
JournalJournal of Prosthetic Dentistry
Issue number5
StatePublished - May 1999


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