Abstract
BackgroundStress relieving corticoto mies during the treatment of maxillary expansion are needed in adult patients.MethodsThree-dimensional (3D) finite element model was prepared, and finite element analysis was processed to evaluate the stress distributions within the skull and maxillary teeth during surgically assisted rapid maxillary expansion (SARME) treatment.ResultsExpansion forces generated more stress on the corticotomy-applied part of the maxilla. The stress levels decreased dramatically above the corticotomy line.ConclusionAsymmetric transveral maxillary expansion might be achieved from a symmetric force generating screw during SARME treatment. SARME osteotomies may concentrate the stress in the expanding maxilla and reduce the pain in other parts of the cranium.
Highlights
Stress relieving corticoto mies during the treatment of maxillary expansion are needed in adult patients
The material consisted of computerized tomography (CT) images of a skeletal class 1 adult patient with normal vertical cephalometric values and without any craniofacial anomalies except for unilateral cross bite
A stress magnitude of 0.40 GPa was recorded below the corticotomy line and stress was dramatically declined to 0.18 GPa above this line (Fig. 7)
Summary
Stress relieving corticoto mies during the treatment of maxillary expansion are needed in adult patients. Posterior cross-bite, which may be occurred by skeletal, dental, or functional reasons, is one of the most common craniofacial disorders in transversal direction [1]. Unilateral posterior cross-bite is a specific subtype of this disorder characterized by an arch deficiency. It may alter the mandibular growth pattern of the growing subjects and form asymmetric condylar height resulting in facial asymmetry [2]. Assisted rapid maxillary expansion (SARME) was one of the most effective methods in the treatment of unilateral cleft palate problem [4]. Hemorrhage, pain, deviation of the nasal septum, periodontal diseases, and relapse of the treatment were shown among the possible problems which might occur during maxillary expansion without surgical corticotomies [5]
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