Cast rest joint used as a movable connector between single restoration and adjacent pontic

Atsushi Mikami, DDS,(a) Hiroyasu Koizumi, DDS, PhD,(a,b) Yumi Ishikawa, DDS, PhD,(a) Naomi Tanoue, DDS, PhD,(c) and Hideo Matsumura, DDS, PhD(a,b)

(a)Department of Fixed Prosthodontics, and (b)Division of Advanced Dental Treatment, Dental Research Center, Nihon University School of Dentistry, Tokyo, and (c)Department of Specialized Dentistry, Nagasaki University Hospital of Medicine and Dentistry, Nagasaki, Japan

This clinical report describes the application of a cast rest for movable connection between a pre-existing restoration and an adjacent pontic. A rest seat was prepared intraorally at the occluso-proximal marginal ridge of a premolar porcelain-fused-to-metal (PFM) restoration. A fixed partial denture (FPD) with a pontic and an extended cast rest was fabricated. Two different FPDs with rest seats were placed and clinically evaluated. After observation periods of one and four years respectively, both FPDs were functioning satisfactorily. Combination of a rest seat sunk into an intraoral restoration and a cast rest adjacent to a pontic can be applied as one of the options of semi-fixed partial dentures, if properly designed. (Int Chin J Dent 2007; 7: 65-68.)

Key Words: movable connector, non-rigid connector, semi-fixed partial denture, rest seat.