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Volume 30 , Issue 3
May/June 2017

Pages 242244

Support Ratio Between Abutment and Soft Tissue Under Overdentures: A Comparison Between Use of Two and Four Abutments

Manami Abe, DDS/Tsung-Chieh Yang, DDS, PhD/Yoshionobu Maeda, DDS, PhD/Takanori Ando, DDS, PhD/Masahiro Wada, DDS, PhD

PMID: 28319205
DOI: 10.11607/ijp.5104

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 implant-supported overdentures was enrolled. Recordings were completed on each subject using a force-measuring 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.

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