Retentive force comparison between esthetic and metal clasps for removable partial denture

Authors

  • Eron Toshio Colauto Yamamoto Department of Prosthodontics – Universidade Nove de Julho Dental School – Sao Paulo – SP – Brazil.
  • Tabata Prado Sato São Paulo State University (Unesp) – Institute of Science and Technology – São José dos Campos – Department of Dental Materials and Prosthodontics – SP – Brazil.
  • João Mauricio Ferraz da Silva São Paulo State University (Unesp) – Institute of Science and Technology – São José dos Campos – Department of Dental Materials and Prosthodontics – SP – Brazil.
  • Alexandre Luiz Souto Borges São Paulo State University (Unesp) – Institute of Science and Technology – São José dos Campos – Department of Dental Materials and Prosthodontics – SP – Brazil. http://orcid.org/0000-0002-5707-7565
  • Eduardo Shigueyuki Uemura São Paulo State University (Unesp) – Institute of Science and Technology – São José dos Campos – Department of Dental Materials and Prosthodontics – SP – Brazil.

DOI:

https://doi.org/10.14295/bds.2017.v20i3.1431

Abstract

Objective: This study aimed to evaluate the retention of acetate resin clasp as when compared to metal clasp. Material and methods: For this purpose, we constructed 10 conventional Co-Cr metal clasps (Ackers) and 20 acetate resin clasps. The acetate resin clasps had the opposition, support and retaining arms made of Co-Cr. Of the 20 esthetic clasps, 10 had the thickness of the retention arm decreased to make it more esthetic. The initial retentive force of the specimens was tested in a universal testing machine through tensile test.  After that, the specimens were subjected to 7,000 cycles, each one, in an adapted machine, immersed into artificial saliva, for 36 months of simulated clinical use of a removable partial denture. Data were tabulated for statistical analysis of the retention effectiveness. Results: After cycling, 3-mm-thick and 2-mm-thick acetate resin clasps lost more retention than metal clasps. The material type (p=0.0000) and cycling (p=0.0039) showed a significant effect, but the material/cycling interaction (p=0.1436) did not. Conclusions: Therefore, esthetic clasps presented retention force lower than that of metal clasps. Notwithstanding, the esthetic clasps can be used in clinical cases requiring minimum retention.

 

Keywords

Removable partial denture; Esthetic clasp; Metal clasp.

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Published

2017-09-12

Issue

Vol. 20 No. 3 (2017): Jul. - Sep. / 2017 - Published September 2017

Section

Clinical or Laboratorial Research