Journal of Prevention and Treatment for Stomatological Diseases ›› 2017, Vol. 25 ›› Issue (8): 523-529.doi: 10.12016/j.issn.2096-1456.2017.08.011

• Cinical Study • Previous Articles     Next Articles

Clinical application of new mandibular molar intruding appliance

Feng WU1(), Junfang LI1, Zhen WANG1, Zhenyu NI2, Hong HE3   

  1. 1. Department of Orthodontics, The Affiliated Huizhou Stomatological Hospital, Jinan University & Huizhou Stomatological Hospital, Huizhou 516001, China
    2. Department of Orthodontics, School of Stomatology, Wenzhou Medical University, Wenzhou 325000, China
    3. Department of Orthodontics, the 1st Division, School of Stomatology, Wuhan University, Wuhan 430079, China
  • Received:2016-11-19 Revised:2017-01-10 Online:2017-08-20 Published:2018-09-03

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Abstract:

Objective To evaluate the effects and clinical application of molar intrusion with a new mandibular molar intrusion appliance.Methods 7 patients who needed mandibular molars intrusion to correct open-bite were selected. To evaluate effects of molar intrusion, clinical examination, dental model analysis and aphalometric analysis by Winceph 7.0 software were used before and after intrusion treatment, SPSS 17.0 software was used for data analysis. Results All the mandibular molars were intruded successfully in an average time of 4.0 months. Cephalometric analysis before and after treatment showed that the average amount of mandibular first molars intrusion were (1.92 ± 0.44) mm．The vertical distance to the reference plane (MP plane) per and post treatment was statistically significant (P < 0.05). The average amount of maxillary first molar intrusion was (0.36 ± 0.25) mm, with no significant difference in vertical distances to reference plane (PP plane) (P > 0.05). No signs of root resorption was obsersed in radiograph of the intruded mandibular molars. Conclusion The new mandibular molar intrusion appliance has a remarkable clinical effect in correcting anterior open bite without obvious periodontal tissue damage and root resorption. teeth intrusion with the new appliance has a significant effect without apparent destruction of the periodontal tissue and root resorption.

Key words: New appliance, Extraoral anchorage, Molars instrusion, Orthodontics

CLC Number: 

  • R783.5

Figure 1

NMIA’s finished product"

Table 1

Comparison of the vertical distance between the Mandibular first molar to MP plane before and after the treatment （mm, n=7）"

病例 矫治前 矫治后 差值 t值 P值
1 22.27 20.92 1.35 10.25 0.000
2 22.50 19.90 2.60
3 21.91 21.00 0.91
4 23.35 21.96 1.39
5 22.76 19.21 3.55
6 22.83 21.05 1.78
7 20.94 19.01 1.93

Table 2

Comparison of the vertical distance between the maxillary first molar to MP plane before and after the treatment （mm, n=7）"

病例 矫治前 矫治后 差值 t值 P值
1 12.93 12.60 0.33 2.13 0.650
2 11.75 11.37 0.32
3 12.60 12.18 0.42
4 10.96 10.96 0.00
5 13.27 13.20 0.07
6 9.89 9.90 -0.01
7 12.59 12.03 0.56

Figure 2

Pre-treatment intra-oral image and X-ray"

Figure 3

Mid-treatment extra oral image, intra-oral image"

Figure 4

Post-treatment intra-oral image and X-ray"

Figure 5

Two years after Post-treatment intra-oral image and X-ray"

Table 3

Comparison of the Cephalometric data before and after the treatment"

测量项目 治疗前 治疗后 变化值
SNA（dgree） 78.1 78.1 0.0
SNB（dgree） 75.0 75.5 0.5
ANB（dgree） 2.8 2.6 0.2
U1-SN（dgree） 98.9 99.0 0.1
L1-MP（dgree） 95.6 95.2 0.4
U1-NA（mm） 4.4 4.9 0.5
L1-NB（mm） 8.1 7.4 0.7
U1-L1（dgree） 124.4 127.6 3.2
MP-SN（dgree） 40.9 40.0 0.9
N-ANS（mm） 52.8 52.5 0.3
ANS-Me（mm） 71.9 70.0 1.9
N-Me（mm） 124.7 122.5 2.2
UMoR-PP（mm） 12.5 12.1 0.4
LMoR-MP（mm） 22.9 21.0 1.9
Overjet（mm） 2.0 1.1 0.9
Overbite（mm） -4.9 0.3 5.2
wits -3.5 -1.2 2.3
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