Bimaxillary surgery in Class III malocclusion: Soft and hard tissue changes

OBJECTIVE: To evaluate the stability of bimaxillary surgery in patients with skeletal malocclusion, with the use of rigid internal fixation. METHODS: Lateral cephalograms from 20 patients, 11 males and 9 females, mean age of 26 years and 1 month, were evaluated before surgery, immediately post-operative and at least 6 months after surgery. Nineteen cephalometric measurements were evaluated, and the results were statistically analyzed by means of the Student's t test and the Kruskal-Wallis test. RESULTS: The Le Fort I maxillary advancement surgery showed almost no relapse. There was lack of stability of mandibular setback, with relapse of 37.33% on point B, due to counterclockwise rotation of the mandible between post-operative periods, occurred by better intercuspation after surgery and muscle adaptation. The results showed the same tendencies for both genders. CONCLUSION: It was concluded that on the bimaxillary surgery treatment of Class III malocclusion, the maxillary surgery was very stable, but the mandibular setback recurred. No statistical differences were found in surgical stability between genders.

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Case Report: Orthosurgical Management of Skeletal Class III Malocclusion

The Journal of Indian Orthodontic Society ◽

10.1177/0301574220919219 ◽

2020 ◽

Vol 54 (2) ◽

pp. 150-156

Author(s):

Sanjeev Verma

Keyword(s):

Case Report ◽

Class Iii ◽

Class Iii Malocclusion ◽

Skeletal Class ◽

Comprehensive Management ◽

Mandibular Setback ◽

Lower Jaw ◽

History Of ◽

Bimaxillary Surgery ◽

Type 3

VG, 25-year-old male, presented with c/c of forwardly placed lower jaw and history of unsatisfactory previous orthodontic treatment. Extraorally, the patient had asymmetrical face and concave profile, competent lips, positive lip step, and chin deviated toward left side by 2 mm. Intraorally, the patient had Angle’s class III type 3 malocclusion with an overjet of (–1) mm, overbite of 0%, and cross-bite wrt 12, 21. The patient was skeletal class III due to macrognathic and prognathic mandible with hypodivergent growth pattern, and proclined upper and retroclined lower incisors. The patient was managed orthosurgically with bimaxillary surgery (maxillary advancement 3 mm + mandibular setback 7 mm) after presurgical decompensation. The case report discusses in detail the diagnosis and comprehensive management of the skeletal class III case.

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Skeletal, Dental and Soft Tissue Changes in Postural Class III Malocclusion Treated with a Maxillary Removable Appliance

Journal of Clinical Pediatric Dentistry ◽

10.17796/jcpd.31.2.u286433up81kt472 ◽

2007 ◽

Vol 31 (2) ◽

pp. 149-152

Author(s):

Elham Abu Alhaija

Keyword(s):

Soft Tissue ◽

Treated Patient ◽

Treated Group ◽

T Test ◽

Class Iii ◽

Class Iii Malocclusion ◽

Soft Tissue Profile ◽

Tissue Changes ◽

Soft Tissue Changes ◽

Removable Appliance

Objective: This longitudinal retrospective cephalometric study was undertaken in an attempt to evaluate the effect of upper removable appliances on the hard and soft tissue structures in subjects with postural Class III. Methods: The material consisted of cephalometric films of 17 Class III patients (8 females and 9 males, with a mean age of 10.10 ± 1.63). Each treated patient was matched before treatment with Class III subject for sex and age. Differences in treated group at T1 and T2 and between treated and untreated groups were examined using paired t-test and independent t-test respectively. Results: Treated and untreated Class III subjects differed in mandibular prognathism (SNB, P<0.01). Upper incisors proclined and inter-incisal angle reduced during treatment (P<0.001). Soft tissue A point moved anteriorly as maxillary incisors were proclined (P<0.05). Soft tissue profile was improved (NNP, P<0.05; NAP, P<0.01). Conclusion: Skeletal, dental and soft tissue changes were found in patients treated by upper removable appliance in postural Class III patients. Clinical relevance: upper removable appliance is an efficient method to procline upper incisors in postural Class III malocclusion and may be of greater influence in improving soft tissue profile.

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