Zygomatic-maxillary cortical bone thickness in hyper, normo and hypodivergent patients

Julyano Vieira Da Costa,Liogi Iwaki Filho,Adilson L Ramos

doi:10.1590/2177-6709.26.1.e211965.oar

Julyano Vieira Da Costa, Liogi Iwaki Filho + Show 1 more

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https://doi.org/10.1590/2177-6709.26.1.e211965.oar

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Abstract

ABSTRACTObjective: The aim of this study was to evaluate the thickness of the zygomatic-maxillary cortical bone using computed tomography in different skeletal patterns. Methods: A total of 54 patients of both sexes, divided into three groups according to the vertical skeletal pattern, were evaluated for cortical bone thickness of the anterior slope of the zygomatic process of the maxilla, using cone beam computed tomography. Measurements were made at 2mm, 4mm, 6mm, 8mm and 10mm above from first molar mesial root apex. Vertical skeletal pattern was determined by Frankfurt mandibular angle (FMA).Results: The hyperdivergent pattern had the lowest cortical thickness value, nevertheless, no patient in the hyperdivergent group presented cortical thickness exceeding 2mm, and no patient in the hypodivergent group presented cortical thickness less than 1mm. However, the correlation between cortical thickness and mandibular plane angle was weak and not significant. Conclusion: Although higher prevalence of thick cortical was observed in the hypodivergent patients, and thin cortical groups in the hyperdivergent group, the vertical skeletal pattern could not be used as determinant of the zygomatic-maxillary cortical thickness.

Highlights

The use of miniplates and other temporary anchorage devices (TADs), have increased the possibilities of orthodontic movement, such as intrusion and distalization of anterior and posterior teeth.[1,2]Some studies have demonstrated success in the treatment of patients considered borderline for the indication of orthognathic surgery, when treated with the aid of these devices
Conclusion: higher prevalence of thick cortical was observed in the hypodivergent patients, and thin cortical groups in the hyperdivergent group, the vertical skeletal pattern could not be used as determinant of the zygomatic-maxillary cortical thickness
The stability of TADs depends on the quality and thickness of the cortical bone, which may be related to the skeletal pattern of the patient.[3,4]

Summary

Introduction

The use of miniplates and other temporary anchorage devices (TADs), have increased the possibilities of orthodontic movement, such as intrusion and distalization of anterior and posterior teeth.[1,2]Some studies have demonstrated success in the treatment of patients considered borderline for the indication of orthognathic surgery, when treated with the aid of these devices. The use of miniplates and other temporary anchorage devices (TADs), have increased the possibilities of orthodontic movement, such as intrusion and distalization of anterior and posterior teeth.[1,2]. The stability of TADs depends on the quality and thickness of the cortical bone, which may be related to the skeletal pattern of the patient.[3,4]. Miniplate fixation is obtained by mechanical retention in the cortical bone, justifying the dependence on adequate bone thickness[5]. Studies have suggested that patients with a vertical growth pattern tend to present lower thickness values of the buccal and lingual bone plates at the level and above the apex of permanent teeth, when compared with patients with a horizontal growth pattern. There are few studies evaluating the area of the zygomatic pillar.[4,5,6,7]

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