DOI: 10.11607/ijp.5104, PubMed ID (PMID): 28319205Pages 242-244, Language: EnglishAbe, Manami / Yang, Tsung-Chieh / Maeda, Yoshionobu / Ando, Takanori / Wada, MasahiroPurpose: The purpose of this preliminary in vivo study was to compare force distribution on abutments (tooth or implant) and tissues supporting overdentures with two or four abutments.
Materials and Methods: A convenience sample of five subjects with tooth and/or implantsupported overdentures was enrolled. Recordings were completed on each subject using a forcemeasuring system mounted on a metal framework with four anteroposterior spread abutments (A), four abutments with denture bases (B), and on two anterior abutments with denture bases (C). The tissue-support ratio (TSR) was calculated as (A−B)/A or (A−C)/A.
Results: TSR values changed 1.5 to 2 times when the number of abutments was reduced from four to two.
Conclusion: The amount of tissue strain on the posterior residual ridge increased when the number of abutments was reduced.
