Comparison of two types of biomecanics for deep overbite correction

Ana De Lourdes Sá De Lira,Yarasmin Nolêto De Sousa Alexandrino

doi:10.1590/1677-3225v14n1a14

Ana De Lourdes Sá De Lira, Yarasmin Nolêto De Sousa Alexandrino

Open Access

https://doi.org/10.1590/1677-3225v14n1a14

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Abstract

Aim: To compare two types of treatment for Class II deep overbite malocclusion assessing maxillary and mandibular arches behavior in subjects submitted to full orthodontic treatment with standard edgewise appliance and those who used straight wire appliance. Methods: The sample consisted of 50 patients treated with full fixed appliances either with edgewise appliance (n=25, Group 1), or with straight wire appliance (n=25, Group 2). In both groups lateral cephalometric radiographs were compared with those done at the beginning of treatment and at its end, in order to quantify the cephalometric measures (8 linear and 6 angular) presenting the maxillary and mandibular arches behavior in the anteroposterior and vertical directions. All patients were treated without extraction or use of Class II intermaxillary elastics during the full orthodontic treatment. Results: In both groups the treatment of malocclusion contributed for mandibular forward displacement, reduction of deep overbite and overjet, reduction of mandibular plane with anti-clockwise rotation and labial projection of maxillary incisors. Conclusions: In both groups the sample showed favorable mandibular displacement, reduction of facial convexity, and profile improvement with anti-clockwise rotation. The correction of deep overbite was due to labial projection and intrusion of maxillary incisors.

Highlights

Received for publication: January 23, 2015 Accepted: March 23, 2015Deep overbite is a malocclusion with skeletal dental and neuromuscular implications characterized by the excessive vertical trespass of incisors[1]
Excessive overlapping of the maxillary incisors over mandibular incisors is noted when values above of 40% by vertical trespass of upper incisors are observed[2]. It can be found in Class I and Class II malocclusions, in Class II division 2 malocclusion[3], and be associated with incisors’ wear, palatal lesions and damaged esthetics[4], periodontal disease, functional deviations, inadequate mastication, occlusal trauma, teeth grinding and temporomandibular joint dysfunction[5]
Several etiologic factors have been associated with the occurrence of deep overbite[6,7] and they may be of genetic or dentofacial development source origin[2], involving change of maxillomandibular growth, modification of labial and lingual functions and dentoalveolar alterations[8]

Summary

Introduction

Received for publication: January 23, 2015 Accepted: March 23, 2015Deep overbite is a malocclusion with skeletal dental and neuromuscular implications characterized by the excessive vertical trespass of incisors[1]. Several etiologic factors have been associated with the occurrence of deep overbite[6,7] and they may be of genetic or dentofacial development source origin[2], involving change of maxillomandibular growth, modification of labial and lingual functions and dentoalveolar alterations[8]. Among these factors are overstated incisors eruption, excessive overjet, incisor mesiodistal width, incisor inclination, canine position, molars infraocclusion, molar cusp height, mandibular rami height and vertical facial type[6]. It may be observed mandibular displacement difficulty, faulty mandibular functional movement, masticatory cycle alteration, Braz J Oral Sci. 14(1):[71-77]

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