齒顎矯正協會-TJO

Issue Highlights

Case Report

Vo1. 31 No. 2 June 2019

Combined Multi-segmental Surgical-orthodontic Treatment in Skeletal Class III with Facial Asymmetry and Gummy Smile: Two-year Stability

Rouh-Hwai Wang, Hui-Ling Chen

This is a case of skeletal class III malocclusion with facial asymmetry, gummy smile, and maxillary canting, treated with bimaxillary surgery and orthodontic treatment. The two-jaw surgery was performed including a 3-pieces LeFort I segmental osteotomy, anterior segment impaction with clockwise rotation, and bilateral sagittal split osteotomies with genioplasty. Through the 2-year-4-month treatment procedure, the skeletal and occlusal relationship turned to be normal with esthetically pleasing smile and profile. Furthermore, in the two-year follow-up, we found the treatment results were quite stable no matter in skeletal or dental aspects.
Case Report

Vo1. 31 No. 2 June 2019

A Modified Surgery-first Approach for Mandibular Prognathism with Proclined Maxillary Incisor and Mandibular Spacing

Jutharath Chanruangvanich, Ellen Wen-Ching Ko, Ying-An Chen

This case report describes the management of an adult patient presenting with a skeletal Class III malocclusion, mandibular protrusion, upper incisor proclination and mandibular arch spacing by a modified surgery-first approach. A 26-year-old man had skeletal Class III and dental Class III malocclusion with concave facial profile, midface deficiency and mandibular prognathism with chin deviation to left. His dental manifestation presented anterior crossbite, upper incisors proclination and spacing in his mandibular arch. Treatment was performed with a modified surgery-first approach, which included a short presurgical alignment phase. In the maxilla, the significant maxillary crowding was relieved by 14 and 24 extractions while partially retracting the maxillary incisors to reduce the incisal proclination. Then, the upper incisors inclination was furtherly corrected more by a 2-pieces LeFort I osteotomy and closure of the 14, 24 residual dental space during surgery. In the mandible, the lower dental spacing was caused by general tooth size/ jaw bone discrepancy with relative upright incisal inclination. The presurgical preparation included consolidation the dental space distal to the bilateral mandibular canines. The bilateral sagittal split osteotomies were conducted for mandible setback and asymmetry correction. Additionally, the subapical osteotomy with Köle procedure was applied to close the dental space in the mandibular arch while keeping the anterior teeth in relative normal inclination. The excessive chin prominence caused by the Köle procedure was reduced by reduction genioplasty and surface contouring. Post-operative orthodontic treatment included overbite control and detailing of the occlusion. After treatment, the maxillary incisors proclination was corrected and all the dental spaces were closed. Patient’s profile was dramatically improved with well teeth alignment, angulation and interdigitation. The 2-pieces LeFort I and Köle osteotomy are the surgical procedures to address the correction in the dentoalveolar portion for efficiently control the inclination of the anterior teeth. Moreover, it also provides benefits for patients who require large amount of jaw setback with minimal effect at the posterior airway space. The treatment goals of the dentoalveolar portion and facial proportion should be contemplated for the staged procedures to improve the efficiency and effectiveness of the treatment outcome.
Case Report

Vo1. 31 No. 2 June 2019

Orthodontic Treatment of Class II Malocclusion with Single Maxillary Incisor

Chien-cheng Chen, Yi-horng Chen

Orthodontic treatment of a Class II malocclusion case with single maxillary central incisor was presented in the case report. The treatment plan consisted of removing one maxillary central incisor instead of premolars. Bilateral maxillary lateral incisors were mesialized for space closure and substitution for maxillary central incisors. The morphology of maxillary lateral incisors was modified to mimic the maxillary central incisors. After treatment, both occlusion and esthetics was improved, and the patient was satisfied with the results.
Case Report

Vo1. 31 No. 2 June 2019

To do or not to do? Slow orthodontic extrusion for implant site development in esthetic zone at the anterior maxilla

Hui-chen Tasi, Chung-Chen Jane Yao,2, 3 Cheing-Meei Liu1, 3

Slow orthodontic extrusion (SOE) for implant site development, was introduced in 1991. It has been more than 20 years since this treatment was applied in our clinical practice. In this paper, we investigate surgeon’s expectation of SOE for special requirements of immediate implantation by a clinical case. We also review case reports/case series searched from PubMed and inspect the power of evidence of these reports from the integration of data collection, and try to define the value of SOE. If the SOE cannot eliminate at least one surgical procedure, we need to consider the necessity of SOE before implant surgery.
Case Report

Vo1. 31 No. 2 June 2019

Orthodontic Correction of Bimaxillary Protrusion with Mini-screws in Class II Hyperdivergent Patient

Shih-Ying Lin, Kai-Wen Yu, Tai-ting Lai, Chung-Ji Liu, Li-Fang Hsu

To achieve a harmonious profile with pleasant smile arc in Class II hyperdivergent adult cases has been a clinical challenge. Adequate retraction and intrusion of maxillary dentition as well as vertical control are the key factors to improve the smiling appearance and the facial profile. A 19-year-old female initially presented with lip protrusion, convex profile, retrusive chin, and a Class II malocclusion. The cephalometric analysis showed a Class II skeletal pattern (ANB = 9°) with high mandibular plane angle (SN-MP = 38°). The treatment plan included extraction of four first premolars for anterior teeth retraction as well as installation of three miniscrews in the maxilla as bony anchorage. Two miniscrews were placed into the infrazygomatic crest of the maxilla and one was inserted in the sub-apical region of maxillary incisors for retraction, intrusion, and torque control of anterior teeth. Bimaxillary protrusion was improved and a stable occlusal relationship was established after treatment. The total treatment duration was 24 months. Cephalometric analysis showed significant intrusion and retraction of maxillary incisors as well as a slight counterclockwise rotation of the mandible. This case demonstrated that the combined use of upper posterior and anterior miniscrews could be an effective manner to treat Class II hyperdivergent adult case with dentoalveolar protrusion.

Vo1. 31 No. 2 June 2019

The Effects of Low Intensity Light Emitted Diode on Human Periodontal Ligament Cell and Mouse Cementoblast Cell Line

Yu-Ting Wu, Yun-Ting Huang, Chun-Yu Chen, Chien-Wei Chao, Chia Tze Kao

Objectives:
The prevention of external root resorption caused by orthodontic tooth movement was endeavored by many researches. The photobiomodulation with low level dose light emitted diode (LED) is reported. The purpose of this study was to investigate the LED effects on the OCCM-30 and PDL cells proliferation.

Editorial Board

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Editor-in-Chief

KO, ELLEN WEN-CHING

Associate Editors

YAO, CHUNG-CHEN LU, TAI-LIANG WANG, YU-CHIH

Editorial Committee

KAO, CHIA-TZE LIU, JIA-KUANG TSAI, CHI-YANG YU, JIAN-HONG LI, CHUNG-HSING TSENG, YU-CHUAN WU, TZU-YING
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