Journal of Prevention and Treatment for Stomatological Diseases ›› 2020, Vol. 28 ›› Issue (10): 635-640.doi: 10.12016/j.issn.2096-1456.2020.10.004

• Basic Study • Previous Articles     Next Articles

Typodont model study on double keyhole loop in mandibular extraction space closure

CAI Senxin1(),LIU Jiali1,CHEN Zexing1,XU Linyu2,SU Jiehua2()   

  1. 1. Fujian Key Laboratory of Oral Diseases & Fujian Provincial Engineering Research Center of Oral Biomaterial & Stomatological Key Lab of Fujian College and University, School and Hospital of Stomatology, Fujian Medical University, Fuzhou 350002, China
    2. Institute of Stomatology & Research Center of Dental and Research Center of Dental Esthetics and Biomechanics, School and Hospital of Stomatology, Fujian Medical University, Fuzhou 350002, China
  • Received:2020-01-09 Revised:2020-04-28 Online:2020-10-20 Published:2020-09-01
  • Contact: Jiehua SU E-mail:fjcsx@fjmu.edu.cn;sujiehua@126.com

Abstract:

Objective To analyze the impact of the activation mode on the results of space closure in the mandibular arch using a double keyhole loop (DKHL) with a typodont model and reverse engineering technique to provide guidance for clinical treatment. Methods Nine normal mandibular typodont models after leveling were randomly divided into 3 groups, which then underwent three types of DKHL activation for space closure. Each model was assessed at the initial stage and after the warm water bath, and the images were superimposed to measure the displacement of special crown and root mark points. All statistical analysis of the data was performed using SPSS 19.0. Results After equal activation times, the root retraction of anterior teeth and the crown forward position of posterior teeth in groups activated at the distal loop (conditions 2 and 3) were much greater than those in the group activated horizontally (condition 1). Activation between mesial and distal loops (condition 3) induced significant anterior tooth intrusion, together with elongation and buccal inclination of posterior teeth. The displacement of mark points among the three conditions showed a statistically significant difference. Conclusion The movement of mandibular anterior and posterior teeth could be flexibly controlled through different DKHL activation modes, which should be chosen carefully according to individual conditions.

Key words: double keyhole loop, typodont, reverse engineering, orthodontic treatment, orthodontic space closure, crown shape, three-dimensional move

CLC Number: 

  • R78

Figure 1

Schematic diagram of three loading conditions A: condition 1; B: condition 2; C: condition 3"

Figure 2

Three-dimensional model of the mandibular dentition a: coronal view of the original model; b: apical view of the original model; c: apical view of the model after adding root data"

Figure 3

Automatic superimposition of numerical model before and after water bath a: condition 1; b: condition 2; c: condition 3"

Table 1

Sagittal displacement of teeth in different loading conditions"

Teeth C1 C2 C3 F P Multiple comparison
L1 Crown 1.24 ± 0.03 0.69 ± 0.08 -0.17 ± 0.11 231.69 < 0.01 C1 > C2 > C3
Root 0.63 ± 0.07 1.56 ± 0.05 3.79 ± 0.16 737.83 < 0.01 C3 > C2 > C1
L2 Crown 1.29 ± 0.02 0.50 ± 0.13 -0.11 ± 0.02 274.54 < 0.01 C1 > C2 > C3
Root 0.56 ± 0.02 1.42 ± 0.02 3.61 ± 0.13 1 184.54 < 0.01 C3 > C2 > C1
L3 Crown 1.36 ± 0.06 0.33 ± 0.05 -0.23 ± 0.02 856.79 < 0.01 C1 > C2 > C3
Root 0.34 ± 0.02 1.72 ± 0.11 4.92 ± 0.27 574.08 < 0.01 C3 > C2 > C1
L5 Crown -0.86 ± 0.08 -1.40 ± 0.10 -2.41 ± 0.23 79.29 < 0.01 C1 > C2 > C3
Root -0.08 ± 0.02 -0.35 ± 0.03 -0.73 ± 0.02 629.01 < 0.01 C1 > C2 > C3
L6 Crown -0.84 ± 0.02 -1.65 ± 0.10 -2.59 ± 0.11 318.29 < 0.01 C1 > C2 > C3
Root -0.57 ± 0.08 -1.30 ± 0.03 -1.92 ± 0.03 537.07 < 0.01 C1 > C2 > C3
L7 Crown -1.04 ± 0.10 -1.96 ± 0.03 -2.98 ± 0.03 717.52 < 0.01 C1 > C2 > C3
Root -1.26 ± 0.06 -1.84 ± 0.08 -2.49 ± 0.08 222.26 < 0.01 C1 > C2 > C3

Table 2

Vertical displacement of teeth in different loading conditions"

Teeth C1 C2 C3 F P Multiple comparison
L1 Crown 0.82 ± 0.03 -1.10 ± 0.16 -2.59 ± 0.02 912.22 < 0.01 C1 > C2 > C3
Root 0.44 ± 0.02 -0.71 ± 0.13 -1.13 ± 0.03 308.97 < 0.01 C1 > C2 > C3
L2 Crown 0.89 ± 0.03 -0.90 ± 0.15 -2.23 ± 0.02 882.28 < 0.01 C1 > C2 > C3
Root 0.42 ± 0.04 -0.55 ± 0.14 -0.96 ± 0.02 190.90 < 0.01 C1 > C2 > C3
L3 Crown 1.02 ± 0.02 -0.02 ± 0.02 -0.90 ± 0.03 6 471.23 < 0.01 C1 > C2 > C3
Root 0.74 ± 0.02 1.17 ± 0.20 2.12 ± 0.03 105.20 < 0.01 C3 > C2 > C1
L5 Crown 1.14 ± 0.03 1.14 ± 0.43 1.90 ± 0.11 8.63 < 0.01 C3 > (C1, C2)
Root 1.09 ± 0.02 1.19 ± 0.40 2.18 ± 0.10 20.47 < 0.01 C3 > (C1, C2)
L6 Crown 0.99 ± 0.05 1.11 ± 0.36 2.07 ± 0.09 22.15 < 0.01 C3 > (C1, C2)
Root 0.98 ± 0.02 0.95 ± 0.31 1.94 ± 0.03 28.68 < 0.01 C3 > (C1, C2)
L7 Crown 0.72 ± 0.02 0.62 ± 0.21 1.31 ± 0.03 27.10 < 0.01 C3 > (C1, C2)
Root 0.60 ± 0.03 0.62 ± 0.21 1.41 ± 0.03 78.05 < 0.01 C3 > (C1, C2)

Table 3

Transverse displacement of teeth in different loading conditions"

Teeth C1 C2 C3 F P Multiple comparison
L1 Crown 0.02 ± 0.10 -0.10 ± 0.03 -0.08 ± 0.05 2.09 0.20
Root 0.03 ± 0.01 0.24 ± 0.02 0.50 ± 0.03 363.44 < 0.01 C3 > C2 > C1
L2 Crown -0.14 ± 0.10 -0.26 ± 0.10 -0.36 ± 0.09 3.30 0.11
Root 0.14 ± 0.02 0.28 ± 0.02 1.19 ± 0.04 1 503.69 < 0.01 C3 > C2 > C1
L3 Crown -0.25 ± 0.18 -0.35 ± 0.12 0.16 ± 0.07 12.07 < 0.01 C3 > (C1,C2)
Root 0.72 ± 0.03 1.39 ± 0.05 2.65 ± 0.02 2 317.19 < 0.01 C2 > C3 > C1
L5 Crown -0.80 ± 0.31 0.71 ± 0.06 0.99 ± 0.04 77.60 < 0.01 C3 > C2 > C1
Root -0.90 ± 0.02 -1.03 ± 0.02 -1.36 ± 0.03 349.02 < 0.01 C1 > C2 > C3
L6 Crown -0.66 ± 0.23 0.99 ± 0.04 1.25 ± 0.02 170.35 < 0.01 C3 > C2 > C1
Root -0.68 ± 0.05 -0.36 ± 0.09 -0.66 ± 0.06 18.42 < 0.01 C2 > (C1,C3)
L7 Crown 0.22 ± 0.07 2.18 ± 0.13 2.18 ± 0.03 523.51 < 0.01 (C2,C3) > C1
Root -0.22 ± 0.07 -0.55 ± 0.07 -0.84 ± 0.11 36.31 < 0.01 C1 > C2 > C3
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