Profile changes in premolar extraction

Authors

  • Susiane Allgayer
  • Eduardo Martinelli Santayana de Lima
  • Susana Maria Deon Rizzatto
  • Carlos Alberto Estevanell Tavares
  • Luciane Macedo de Menezes
  • Mauricio Barbieri Mezzomo

Keywords:

Dental extraction, premolar tooth, corrective orthodontics

Abstract

Purpose: This retrospective study assessed patients treated with extraction of premolars by analysis of lateral cephalograms, comparing the effect of different tooth extraction protocols on the profile. Methods: Eighty-seven patients were selected from the private practices of three orthodontists certified by the Brazilian Board of Orthodontics and Facial Orthopedics. These patients were treated with fixed edgewise appliances and divided into three groups according to the sequence in which premolars were extracted: “Group 40”, maxillary first premolars (22 patients); “Group 44”, both maxillary and mandibular first premolars (43 patients); and “Group 45”, maxillary first and mandibular second premolars (22 patients). The Z angle and the Burstone line were used to quantify and compare the profiles before and after treatment. Results: Student’s t-test showed profile improvement in all groups, as the Z angle value was higher at treatment completion and the lip measurements were in agreement with the values recommended by Burstone. Analysis of treatment changes by the ANOVA did not reveal significant differences between groups. Conclusion: the protocols produced similar facial appearance at treatment completion.

Author Biographies

Susiane Allgayer

DDS., MSc. Private Practice and Graduate PhD Student, Department of Orthodontics, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, RS, Brazil.

Eduardo Martinelli Santayana de Lima

MSc., PhD. Private Practice and Coordinator of the Specialization Course in Orthodontics at PUCRS and MSc Program in Orthodontics at PUCRS, Porto Alegre, RS, Brazil. Orthodontists certified by the Brazilian Board of Orthodontics and Dentofacial Orthopedics (BBO)

Susana Maria Deon Rizzatto

DDS., MSc. Private Practice and Professor, Department of Orthodontics, Pontifícia Universidade Católica do Rio Grande do Sul, RS, Brazil. Orthodontists certified by the Brazilian Board of Orthodontics and Dentofacial Orthopedics (BBO)

Carlos Alberto Estevanell Tavares

MSc, PhD. Private Practice and Orthodontists certified by the Brazilian Board of Orthodontics and Dentofacial Orthopedics (BBO) and Professor, Department of Orthodontics, ABO, Porto Alegre, RS, Brazil.

Luciane Macedo de Menezes

DDS, MSc, PhD. Private Practice and Professor, Department of Orthodontics, PUCRS. Coordinator of the Specialization Course in Orthodontics at ABORS and PhD Program in Orthodontics at PUCRS, Porto Alegre, RS, Brazil.

Mauricio Barbieri Mezzomo

DDS, MSc. Private Practice and, Professor, Department of Orthodontics, UNIFRA, Santa Maria, RS, Brazil.

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Published

2011-11-15

Issue

Vol. 26 No. 4 (2011)

Section

Original Article

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