Abstract
This research aimed to evaluate the effects of presurgical mandibular incisor decompensation on long-term outcomes of Class III surgical orthodontic treatment. Thirty-five patients with skeletal Class III malocclusion who received conventional surgical orthodontic treatment were included. Mandibular incisor brackets with −6° of inclination were placed normally in 18 patients (NB group) and inversely in 17 patients (RB group). Between-group differences and relationships between incisal and skeletal variables were analyzed based on lateral cephalograms at pretreatment, presurgery, postsurgery, posttreatment, and retention. Mandibular incisors were more labially inclined in the RB group than in the NB group from presurgery to retention. No significant between-group differences were observed in presurgical and postsurgical skeletal relationships. The NB group exhibited a larger overjet with deficient interincisal contact at postsurgery than the RB group. Skeletal Class III relationship was also more severe in the NB group at retention. More lingually inclined mandibular incisors at presurgery and larger overjet at postsurgery were correlated with a more severe skeletal Class III relationship at retention. Thus, establishing appropriate postsurgical overjet by sufficient presurgical mandibular incisor decompensation may play a significant role in postsurgical stability of Class III surgical orthodontic treatment.
Highlights
Published: 28 June 2021Patients with skeletal malocclusion generally exhibit dentoalveolar compensation to adapt their craniofacial skeletal patterns [1]
Patients were divided into two groups according to the manner in which brackets were placed relative to the mandibular incisors: (1) in the normal bracketing group (NB), mandibular incisor brackets (MBT prescription [16]) were placed in the normal way with inclination set to −6◦ ; (2) in the reverse bracketing group (RB), brackets were placed inversely with inclination of the mandibular incisors set to +6◦ [17]
This study analyzed the effects of presurgical mandibular incisor decompensation on long-term outcomes of skeletal Class III surgical orthodontic treatment
Summary
Published: 28 June 2021Patients with skeletal malocclusion generally exhibit dentoalveolar compensation to adapt their craniofacial skeletal patterns [1]. Camouflage treatment using dentoalveolar compensation is a treatment option for patients with skeletal Class III malocclusion; when this approach is esthetically and functionally inappropriate, surgical orthodontic treatment should be considered [4]. During presurgical orthodontic treatment of skeletal Class III malocclusion, elimination of dentoalveolar compensation including proclination of the mandibular incisors and retroclination of the maxillary incisors should be performed to ensure a desirable inclination of incisors to the basal bone and to expose the original skeletal discrepancy [4]. Such decompensation determines the degree of surgery
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