Journal of Prevention and Treatment for Stomatological Diseases ›› 2016, Vol. 24 ›› Issue (5): 288-292.doi: 10.12016/j.issn.2096-1456.2016.05.006

• Clinical Study • Previous Articles     Next Articles

Influence of impacted maxillary central incisor on craniofacial structure and its orthodontic treatment

LEI Lang,KE Xiao-jing,LI Hou-xuan(),LI Huang,YAN Fu-hua   

  1. Nanjing Stomatological Hospital & the Affiliated Stomatological Hospital of Medical School of Nanjing University, Nanjing 210008, China
  • Received:2015-08-30 Revised:2015-11-04 Online:2016-05-20 Published:2016-05-20
  • Contact: Hou-xuan LI E-mail:lihouxuan3435_0@163.com

Abstract:

Objective To explore the influence of impacted maxillary central incisor on craniofacial structure and its orthodontic treatment. Methods A total of 63 subjects with impacted upper central incisors were selected and categorized into the mixed (n=32) and permanent dentition group (n=31). By using the lateral cephalograms of each subject, 15 angular and 6 linear measurements were made. The cephalometric data were analyzed and compared to data of its corresponding control group with normal occlusion. Results Among the etiological factors of all 63 cases with impacted upper incisors, supernumerary teeth, dentigerous cyst or odontoma, mechanical trauma and idiopathic factors comprise of 6.3%, 6.3%, 12.4% and 73% respectively. Cephalometric analysis demonstrated a more retruded position of "A" point with decreased SNA and ANB angle in incisor impaction group. Dental compensations followed the decreased ANB angle with more proclined upper incisor and more upright lower incisor. In early stage of root development (stage 7 and 8 of Nolla's method), 12 out of 13 incisors were tracted successfully, whereas in late stage( stage 9 and 10), 7 out of 15 incisors were extracted. Conlusions Upper central incisor impaction adversely influences maxillary development. Early orthodontic treatment can improve successful rate and gain a better root morphology.

Key words: Impacted tooth, Central incisor, Orthodontics, Cephalometry, Dental age

CLC Number: 

  • R783.5

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项目 混合牙列 恒牙列
埋伏组 对照组 埋伏组 对照组
数量(例) 32(男13,女19) 72(男36,女36) 31(男9,女22) 70(男30,女40)
年龄(岁) 9.61±1.37 9.60±1.15 15.83±3.77 20.30±1.56

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项目 总数 囊肿和牙瘤 多生牙 外伤 不明原因
病例数 63 4(6.3) 4(6.3) 9(14.2) 46(73.0)

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项目 混合牙列 恒牙列
阻生组 对照组 阻生组 对照组
骨骼矢状向 SNA(°) 78.61±3.30 1) 81.00±3.90 82.13±3.29 1) 83.21±2.80
SNB(°) 76.98±3.53 77.50±3.60 79.67±3.80 80.40±2.82
ANB(°) 1.62±2.52 1) 3.50±1.80 2.48±2.32 1) 3.86±1.74
NPog-FH(°) 83.55±2.86 83.50±3.60 84.97±3.39 85.59±2.33
面突角(°) 4.03±5.74 1) 7.60±4.20 5.52±6.17 1) 7.67±4.06
骨骼垂直向 MP-FH(°) 29.81±4.30 29.50±5.50 28.64±6.37 26.99±3.90
MP-SN(°) 34.56±4.27 # 32.47±5.99 31.37±3.32
OP-FH(°) 17.58±6.93 15.60±4.30 15.40±6.65 11.61±4.11
Y-axis(°) 64.12±2.76 65.20±3.80 63.92±3.74 62.52±2.65
牙性指标 U1-SN(°) 106.94±5.99 1) 104.80±5.30 109.87±7.70 1) 106.90±5.50
U1-NA(°) 37.15±7.16 1) 22.40±5.20 35.47±7.42 1) 32.34±5.48
U1-NA长(mm) 5.38±1.94 # 5.59±1.81 5.05±2.34
L1-NB(°) 35.87±6.46 # 35.17±5.65 1) 39.49±6.94
L1-NB长(mm) 5.62±1.97 # 6.05±1.89 6.12±2.12
L1-MP(°) 95.86±6.90 96.20±5.80 95.29±5.63 1) 100.03±6.36
U1-L1(°) 122.63±7.93 122.70±7.80 122.43±9.34 124.68±7.53
覆盖(mm) 1.26±2.75 # 2.62±2.28 2.90±1.20
覆牙合(mm) 0.32±1.46 # 2.06±1.44 1.62±1.27
软组织 Ls-E线(mm) 0.54±2.85 1) 2.50±1.33 0.40±3.44 -0.10±2.18
Li-E线(mm) 2.14±3.00 3.00±1.74 2.45±2.48 1.23±2.15
Z角(°) 74.87±6.05 1) 69.77±5.17 75.97±7.41 74.24±4.22

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