PMID- 28319205 OWN - Quintessenz Verlags-GmbH CI - Copyright Quintessenz Verlags-GmbH OCI - Copyright Quintessenz Verlags-GmbH TA - Int J Prosthodont JT - The International Journal of Prosthodontics IS - 1942-4426 (Electronic) IS - 0893-2174 (Print) IP - 3 VI - 30 PST - ppublish DP - 2017 PG - 242-244 LA - en TI - Support Ratio Between Abutment and Soft Tissue Under Overdentures: A Comparison Between Use of Two and Four Abutments LID - 10.11607/ijp.5104 [doi] FAU - Abe, Manami AU - Abe M FAU - Yang, Tsung-Chieh AU - Yang T FAU - Maeda, Yoshionobu AU - Maeda Y FAU - Ando, Takanori AU - Ando T FAU - Wada, Masahiro AU - Wada M CN - AB - Purpose: 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. AID - 849879