Journal of Prevention and Treatment for Stomatological Diseases ›› 2016, Vol. 24 ›› Issue (2): 94-97.doi: 10.12016/j.issn.2096-1456.2016.02.006

Special Issue: 11

• Clinical Study • Previous Articles     Next Articles

The investigation of the perpendicular occlusal condition of the mesially impacted mandibular third molars and its relationship with TMD

Hai-tao WANG1,Min YU2,Zeng-quan WANG3(),Shao-qin TU3,Si-yuan WU3   

  1. 1General dentistry of South Branch of Foshan Stomatological Hospital, Foshan 528000, China
  • Received:2015-09-02 Revised:2015-09-21 Online:2016-02-20 Published:2016-02-20
  • Contact: Zeng-quan WANG E-mail:gelingzf3343@163.com

Abstract:

Objective To investigate the perpendicular occlusal condition of the mesially impacted mandibular third molars and its relationship with temporomandibular joint disorders (TMD). Methods Thirty-seven cases of mesially impacted mandibular wisdom teeth were selected as the observation group, and 20 cases of other oral diseases without the mesially impacted third molars were selected as the control group from Jun 2012 to Sep 2014. Occlusion in the vertical, buccal-lingual and mesial-distal directions were analyzed with occlusion index.Depth of Spee curve was measured by AutoCAD software. Results Prevalence of TMD of observation group (51.4%) was significantly higher than the control group (15.0%), the difference between the two groups was statistically significant (χ 2=7.24, P=0.007). Observation group's vertical abnormal occlusion rate (40.5%) was significantly higher than the control group (10.0%), the difference between the two groups was statistically significant (P<0.05). Average depth of Spee curve in observation group and control group were (2.41±0.26) mm and (2.05±0.18) mm respectively, the difference was statistically significant (t=4.51, P=0.009). Conclusion Incidence of TMD in patients with mesially impacted mandibular wisdom tooth is higher than that of patients without mesially impacted mandibular wisdom tooth. Mandibular impacted wisdom tooth may cause vertical abnormal occlusion. TMD is related to vertical abnormal occlusion.

Key words: Mesially impacted mandibular third molar, Temporomandibular joint disorders, Spee curve, Vertical abnormal occlusion, Occlusion index

CLC Number: 

  • R782.6

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"

组别 n(例) 垂直向 颊舌向 近远中向
正常 异常 正常 异常 正常 异常
观察组 37 22(59.5) 15(40.5) 28(75.7) 9(24.3) 31(83.8) 6(16.2)
对照组 20 18(90.0) 2(10.0) 16(80.0) 4(20.0) 18(90.0) 2(10.0)
t 5.79 0.14 0.42
P 0.016 0.710 0.519

"

组别 n(例) 垂直向 颊舌向 近远中向
观察组 37 32.15±2.16 29.68±3.26 29.82±3.76
对照组 20 23.12±2.07 27.65±2.92 27.56±3.61
t 8.37 0.56 0.28
P 0.001 0.812 0.861

"

组别 n(例) 下颌第二磨牙
近中颊尖
下颌第一磨牙
远中颊尖
下颌第一磨牙
近中颊尖
下颌第二前磨牙
颊尖
下颌第一前磨牙
颊尖
下颌尖牙
牙尖
观察组 37 0.91±0.16 1.82±0.40 2.33±0.30 1.47±0.08 0.50±0.06 0.04±0.24
对照组 20 0.74±0.14 1.42±0.35 1.92±0.28 1.46±0.06 0.52±0.07 0.08±0.26
t 4.02 5.21 5.16 0.26 0.37 0.45
P 0.039 0.015 0.017 0.869 0.791 0.716

"

组别 n(例) 下颌第二磨牙
近中颊尖
下颌第一磨牙
远中颊尖
下颌第一磨牙
近中颊尖
下颌第二前磨牙
颊尖
下颌第一前磨牙
颊尖
下颌尖牙
牙尖
观察组 37 0.91±0.17 1.86±0.43 2.32±0.31 1.47±0.09 0.52±0.06 0.05±0.22
对照组 20 0.74±0.15 1.43±0.36 1.93±0.30 1.46±0.07 0.51±0.05 0.10±0.25
t 4.09 5.25 5.17 0.29 0.39 0.49
P 0.037 0.014 0.019 0.832 0.782 0.712
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