Evaluation of occlusal rest seat depth in bicuspids: an experimental study

Authors

  • José Carlos Reis Campos Faculdade de Medicina Dentária da Universidade do Porto
  • André Ricardo Correia Faculdade de Medicina Dentária da Universidade do Porto
  • Maria Helena Figueiral Professor Auxiliar Convidado Departamento de Prótese Removível Faculdade de Medicina Dentária da Universidade do Porto
  • Patrícia Fonseca Faculdade de Medicina Dentária da Universidade do Porto
  • Filomena Rodrigues Médica Dentista. Clínica Privada no Porto.
  • Fernando Morais Branco Faculdade de Medicina Dentária da Universidade do Porto

Keywords:

Removable partial denture, dental abutments, bicuspid, dental enamel, dentin,

Abstract

Objective: Since premolars may be used as abutment teeth of removable partial dentures, the aim of this study was to evaluate the depth of occlusal rest seats in premolars and its relation with dentin and enamel. Methods: Twenty-nine premolar teeth (extracted for orthodontic reasons) were randomly selected from patients at a University Clinic. The mesio-distal and buccal-lingual dimensions were measured. Rest seats were prepared with round burs (1.0-1.5 mm) in premolar mesial and distal fossae. Rest seats were cut with a microtome and observed in a scanning electron microscope. Tooth abrasion was also evaluated using the Gourdon indice. Results: Significant differences were observed in the enamel thickness before and after rest seat preparations. Maximum enamel thickness in the deepest part of the rest seat was 625 μm in distal and 500 μm in mesial. In more than 50% of the teeth, dentin was reached. Almost 80% were not abraded. Conclusion: In most situations it is not possible to prepare a rest seat with 1.5 mm depth only in enamel. In teeth not abraded it is possible to prepare rest seats with 1.0 mm without reaching dentin. There are significant differences between enamel thickness in distal and mesial, before and after rest seat preparation.

Author Biographies

José Carlos Reis Campos, Faculdade de Medicina Dentária da Universidade do Porto

Professor Auxiliar com Agregação na Faculdade de Medicina Dentária da Universidade do Porto. Departamento de Prótese Removível.

André Ricardo Correia, Faculdade de Medicina Dentária da Universidade do Porto

Serviço de Anatomia Faculdade de Medicina Dentária da Universidade do Porto

Maria Helena Figueiral, Professor Auxiliar Convidado Departamento de Prótese Removível Faculdade de Medicina Dentária da Universidade do Porto

Professora Associada com Agregação na Faculdade de Medicina Dentária da Universidade do Porto. Departamento de Prótese Removível.

Patrícia Fonseca, Faculdade de Medicina Dentária da Universidade do Porto

Professora Auxiliar Convidada de Prótese Removível na Faculdade de Medicina Dentária da Universidade do Porto. Departamento de Prótese Removível.

Filomena Rodrigues, Médica Dentista. Clínica Privada no Porto.

Médica Dentista. Clínica Privada no Porto.

Fernando Morais Branco, Faculdade de Medicina Dentária da Universidade do Porto

Professor Catedrático da Faculdade de Medicina Dentária da Universidade do Porto.

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Published

2013-11-03

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Original Article