Browse > Article

A study on treatment effects of Class III cases by second molar extraction  

Lee, Sung-Hee (Department of Orthodontics, Cllege of Dentistry, Kyung-Hee University)
Park, Young-Guk (Department of Orthodontics, Cllege of Dentistry, Kyung-Hee University)
Chung, Kyu-Rhim (Department of Orthodontics, Cllege of Dentistry, Kyung-Hee University)
Publication Information
The korean journal of orthodontics / v.34, no.2, 2004 , pp. 109-119 More about this Journal
Abstract
This study aimed at investigating the skeletal, dentoalveolar, and soft tissue changes of Class III malocclusion cases treated by second molar extraction. The lateral cephalograms of 15 subjects with moderate Class III malocclusion by average ANB $-1.4^{\circ}\;and\;IMPA\;85^{\circ}$ were traced and the computerized superimposition of average craniofacial change was made. The data was gathered and statistically analyzed. The results were as follows: 1 Lower anterior facial height/anterior facial height increased by 0.6%(P<0.01), mandibular plane increased by $1.5^{\circ}$(P<0.05). 2. There was a slightly downward & backward rotation of the mandible. 3. Lower first molar tipped distally by 4.nm(P<0.001), lower anterior teeth lingually tipped by $3.2^{\circ}$(P<0.05). 4. Retracted lower lip improved facial profile. This study may suggest that second molar extraction could be effective for a moderate Class III malocclusion to make distalization of the lower first molar easier and avoid severe lingual tipping of the lower incisor, if the lower third molar has a normal shape, good direction of eruption and adequate time for lower second molar extraction
Keywords
Class III malocclusion; Second molar extraction; Treatment effect; lateral cephalograms;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Graber TM, Vanarsdall Jr RL. Othodontic current principles and tec-hniques, 2ed., Mosby. 1994: 531-7
2 Osborne WH, Snyder AJ, Tempel TR. Attachment levels and crevi cular depths at the distal of mandibular second mol따s following removal of adjacent their molars. J Periodontol 1982 : 53 : 93-5
3 Quinn GW. Extraction of four Second molars. Angle orthod 1985 : 55 : 58-69
4 Angle EH. Malocclusion of the teeth, Philadelphia, S.S White, 1907
5 Shiller WR. Positonal changes in mesioangular impacted mandibular third molars during a year. J Am Dente Assoc 1979 : 99 : 460-4
6 Ngan P. Hagg U, Yiu C, Wei SH. Cephalometric comparisons of Chinese and Caucasian surgical Class III patents Int J Adult Orthodon Orthognath Surg 1997 : 12 : 177-88
7 김재우, 손병화 Angle씨 제 3 급 부정교합 환자 치료 전후의 안모 연조직 변화에 관한 두부방사선 계측학적 연구. 대치교정지 1983 : 13 : 177-82
8 Saadia M, Torres E. Sagittal changes after maxillary protraction with expansion in class III patients in the primary, mixed, and late mixed dentitions : a logitudinal retrospective study. Am J Orthod Dentofac-Orthop 2000 : 117 : 669-80   DOI
9 Ishii N, Deguchi T, Hunt NP. Craniofacial differences between Japenese and British Caucasian females with a skele때 Class III malocclusion. Eur J Orthod 2002 : 24 : 493-9
10 Chipman MR. Second and third molars: their role in orthodontic therapy. Am J Orthod 1961 : 47 : 498-520
11 Sakamoto T, Iwase I, Vka A, Nacamara S. A roentgenocephalometric study of skeletal changes during and after chin cup treatment, Am J Orthod 1984 : 85 : 341-50
12 Waters D, Harris EF. Cephalometric comparison of maxillary second molar extraction and nonextraction tratments in patients with Class II malocclusion Am J Orthod Dentofac Orthop 2001 : 120 : 608-13
13 Battagel JM, Orton HS. A comparative study of the effects of cus-tomized faceroask therapyor headgearto the lowerarch on the devel oping Class III face. Europ J Orthod 1995 : 17: 467-82
14 Hinds EC, Frey KF. Hazardof retained third molars in olderpersons report of 15 cases J Am Dente Assoc 1980 : 101 : 246-50
15 Mclaughlin RP, Bennett JC, Trevisi HJ. Systemized orthodontic treat-ment mechanics, led. Mosby. 2001 : 236-47
16 Case CS. Dental Orthopec1ia，Chicago, C.S. Case Co., 1908
17 Ast DB, Carlos JD, Cons NC. The prevelance and characteristics of malocclusion among senior high school students in upstate N.Y. Am J Orthod 1965 : 51 : 437-45
18 Walker GF. A new approach to the analysis of craniofacial morpho logy and growth. Am J Orthod 1972 : 61 : 221-30
19 Richardson ME. The early developmental position of the lower third molar relativeto certainjaw dimensions. Angle Orthod 1970 : 55 : 226-230
20 Thurow RC. A new drum. Angle Orthod 1985 : 55 : 4-5
21 Dacre JT. The criteriafor lower second molar exraction. Br J Orthod 1987: 14: 1-9
22 Richardson ME, Lower molar crowding in the early permanent den-tition. Angle Orthod 1985 : 55 : 51-7
23 Liddle DW. Second molar extraction in orthodontic treatment. Am J Orthod 1977 : 72 : 599-616
24 홍순창,유영규, 하악 제 2 대구치의 발치후 제 3 대구치의 변화에 관한연구. 대치교정지 1987 : 17 : 321-33
25 Cha KS. Skeletal changes of maxillary protraction in patients exth-biting skeletal class III malocclusion : a comparison of three skeletal maturation groups. Angle Orthod 2003 : 73 : 26-35   PUBMED
26 Wendell PD, Nanda R, Sakamoto J, Nakamura S. The effects of chin cup therapy on the mandible:a logitudinal study. Am J Orthod 1985 : 87: 265-72
27 Cavanaugh JJ. Third molar changes following second molar extrac tions. Angle Orthod 1985 : 55 : 70-6
28 정현수. 하악 제 2 대구치 발거를 시행한 앵글 제 3급 부정교합의 치험예, 대치협회지 1986 : 24 : 59-71
29 Romanides N, Servoss JM, Kleinrock S, Lohner J. Anterior and Posterior dental changes in second molarextraction cases. J Clin Orthod 1990 : 559- 63
30 유영규 연세 대학교 학생 2378명 을 대상으로 한 부정교합 빈도에 관한연구. 대치교정지 1971 : 2 : 35-40
31 Orton HS, Sullivan PG, Battagel JM, Orton S. The management of class III and class III tendency occlusions using headgear to the mandibular dentition. Br J Orthod 1983 : 10 : 2-12
32 정규렴. 한국아동의 안면골 성장에 관한 누년적 연구. 대치교정지 1981 : 11 : 85-100