An examination of cingulum rest seats in incisor and canine teeth

This study examined rest seats prepared in the cingula of incisor and canine teeth in terms of their form and their ability to offer denture support. Fifty rest seats prepared in vivo were examined and the fit of the denture framework was assessed at the trial insertion stage. Twenty two of the rests investigated showed no approximation (within 0.1 mm) between the casting and the floor of the rest seat. Investigations in vitro showed the provision of rest seats reduced the labial displacement of incisor and canine abutments under transmitted load compared to the same teeth without preparations.