Tags

Type your tag names separated by a space and hit enter

Change in maxillary incisor inclination during surgical-orthodontic treatment of skeletal Class III malocclusion: comparison of extraction and nonextraction of the maxillary first premolars.
Am J Orthod Dentofacial Orthop. 2013 Mar; 143(3):324-35.AJ

Abstract

INTRODUCTION

The purpose of this study was to investigate differences in preoperative decompensation and postoperative compensation of the maxillary incisors in patients with skeletal Class III malocclusion treated with 2-jaw surgery and extraction or nonextraction of the maxillary first premolars.

METHODS

The subjects consisted of 50 skeletal Class III patients who had a normal maxillary position, prognathic mandible, and mild crowding in the maxillary arch (≤4 mm). All patients were treated with 2-jaw surgery. They were divided into 2 groups: group 1 (n = 25) had extraction of the maxillary first premolars, and group 2 (n = 25) had no extractions. Lateral cephalograms were analyzed before treatment (T0), 1 month before surgery (T1), 1 day after surgery (T2), and after debonding (T3). After measurement of the skeletodental variables, statistical analyses were performed.

RESULTS

At T0, group 1 exhibited more compensated maxillary incisors compared with group 2 (U1-SN, P <0.001). Considerable preoperative decompensation in group 1 and negligible preoperative decompensation in group 2 occurred at T1 (ΔU1-SN, -9.1° vs 1.1°). Although maxillary incisor inclination significantly decreased with surgical movement of the maxilla at T2, this increased to compensate for the postsurgical skeletal relapse in both groups at T3. Although 24% of group 1 had a normal range of maxillary incisor inclination (U1-SN) at T0, it increased to 68% at T1. A dominant pattern of the subjects within the normal range of U1-SN was maintained in groups 1 and 2 (80% and 96% at T2, and 72% and 80% at T3, respectively). According to the achievement ratio, the U1-SN value became close to the norm mainly by preoperative decompensation in group 1 (95.5%) and by surgery in group 2 (130.2%).

CONCLUSIONS

The results of this study might provide effective guidelines for predicting the amount and pattern of preoperative decompensation and postoperative compensation of the maxillary incisors in skeletal Class III patients treated with 2-jaw surgery.

Authors+Show Affiliations

Postgraduate student, Department of Orthodontics, School of Dentistry, Seoul National University, Seoul, South Korea.No affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

23452966

Citation

Kim, Do-Keun, and Seung-Hak Baek. "Change in Maxillary Incisor Inclination During Surgical-orthodontic Treatment of Skeletal Class III Malocclusion: Comparison of Extraction and Nonextraction of the Maxillary First Premolars." American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, vol. 143, no. 3, 2013, pp. 324-35.
Kim DK, Baek SH. Change in maxillary incisor inclination during surgical-orthodontic treatment of skeletal Class III malocclusion: comparison of extraction and nonextraction of the maxillary first premolars. Am J Orthod Dentofacial Orthop. 2013;143(3):324-35.
Kim, D. K., & Baek, S. H. (2013). Change in maxillary incisor inclination during surgical-orthodontic treatment of skeletal Class III malocclusion: comparison of extraction and nonextraction of the maxillary first premolars. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 143(3), 324-35. https://doi.org/10.1016/j.ajodo.2012.10.014
Kim DK, Baek SH. Change in Maxillary Incisor Inclination During Surgical-orthodontic Treatment of Skeletal Class III Malocclusion: Comparison of Extraction and Nonextraction of the Maxillary First Premolars. Am J Orthod Dentofacial Orthop. 2013;143(3):324-35. PubMed PMID: 23452966.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Change in maxillary incisor inclination during surgical-orthodontic treatment of skeletal Class III malocclusion: comparison of extraction and nonextraction of the maxillary first premolars. AU - Kim,Do-Keun, AU - Baek,Seung-Hak, PY - 2012/06/01/received PY - 2012/10/01/revised PY - 2012/10/01/accepted PY - 2013/3/5/entrez PY - 2013/3/5/pubmed PY - 2013/4/25/medline SP - 324 EP - 35 JF - American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics JO - Am J Orthod Dentofacial Orthop VL - 143 IS - 3 N2 - INTRODUCTION: The purpose of this study was to investigate differences in preoperative decompensation and postoperative compensation of the maxillary incisors in patients with skeletal Class III malocclusion treated with 2-jaw surgery and extraction or nonextraction of the maxillary first premolars. METHODS: The subjects consisted of 50 skeletal Class III patients who had a normal maxillary position, prognathic mandible, and mild crowding in the maxillary arch (≤4 mm). All patients were treated with 2-jaw surgery. They were divided into 2 groups: group 1 (n = 25) had extraction of the maxillary first premolars, and group 2 (n = 25) had no extractions. Lateral cephalograms were analyzed before treatment (T0), 1 month before surgery (T1), 1 day after surgery (T2), and after debonding (T3). After measurement of the skeletodental variables, statistical analyses were performed. RESULTS: At T0, group 1 exhibited more compensated maxillary incisors compared with group 2 (U1-SN, P <0.001). Considerable preoperative decompensation in group 1 and negligible preoperative decompensation in group 2 occurred at T1 (ΔU1-SN, -9.1° vs 1.1°). Although maxillary incisor inclination significantly decreased with surgical movement of the maxilla at T2, this increased to compensate for the postsurgical skeletal relapse in both groups at T3. Although 24% of group 1 had a normal range of maxillary incisor inclination (U1-SN) at T0, it increased to 68% at T1. A dominant pattern of the subjects within the normal range of U1-SN was maintained in groups 1 and 2 (80% and 96% at T2, and 72% and 80% at T3, respectively). According to the achievement ratio, the U1-SN value became close to the norm mainly by preoperative decompensation in group 1 (95.5%) and by surgery in group 2 (130.2%). CONCLUSIONS: The results of this study might provide effective guidelines for predicting the amount and pattern of preoperative decompensation and postoperative compensation of the maxillary incisors in skeletal Class III patients treated with 2-jaw surgery. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/23452966/Change_in_maxillary_incisor_inclination_during_surgical_orthodontic_treatment_of_skeletal_Class_III_malocclusion:_comparison_of_extraction_and_nonextraction_of_the_maxillary_first_premolars_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(12)01109-2 DB - PRIME DP - Unbound Medicine ER -