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Journal of Peking University (Health Sciences) ›› 2021, Vol. 53 ›› Issue (3): 594-597. doi: 10.19723/j.issn.1671-167X.2021.03.026

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Three-dimensional movement of posterior teeth after losing the interproximal and occlusal contacts in adults

LIU Xiao-qiang1,YANG Yang1,ZHOU Jian-feng1,LIU Ming-yue2,Δ(),TAN Jian-guo1,Δ()   

  1. 1. Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
    2. First Clinical Division, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
  • Received:2019-04-09 Online:2021-06-18 Published:2021-06-16
  • Contact: Ming-yue LIU,Jian-guo TAN E-mail:815liumingyue@163.com;tanwume@vip.sina.com
  • Supported by:
    National Nature Science Foundation of China(81701001);Program for New Clinical Techniques and Therapies of Peking University School and Hospital of Stomatology(PKUSSNCT-19A03)

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Abstract:

Objective: To observe the movement of posterior teeth after losing the interproximal and occlusal contacts in adults from the amount and speed of mesial-distal, buccal-lingual, occlusal-gingival and three-dimensional movements. Methods: Twenty cases of metal post-core restoration from the Department of Prosthodontics, Peking University School and Hospital of Stomatology were recruited into this study, which was an observational study. The restored teeth had complete mesial, distal, and occlusal contacts before treatment. All the interproximal and occlusal contacts were removed during the preparation for the post-core. The three-dimensional positions of the post-core preparation were obtained by the intraoral scanner at the day of tooth preparation and that of post-core placement. The amounts of mesial-distal, buccal-lingual and occlusal-gingival tooth movement were measured in the software. On this basis, the amount of three-dimensional tooth movement was calculated. The speed of tooth movement was calculated based on the elapsed time between the two scans. Results: Ten females and ten males with an average age of (29.5±4.9) years were recruited. The average elapsed time was (10.9±2.7) days. The amount of the mesial-distal tooth movement was (134.8±61.2) μm, of the buccal-lingual tooth movement was (110.3±39.5) μm, of the occlusal-gingival tooth movement was (104.8±57.5) μm, and of the three-dimensional tooth movement was (211.4±71.0) μm, respectively. The amounts of mesial-distal, buccal-lingual and three-dimensional tooth movements were larger in female than in male (P<0.05). The speed of the mesial-distal tooth movement was (13.1±7.8) μm/d, of the buccal-lingual tooth movement was (10.6±4.5) μm/d, of the occlusal-gingival tooth movement was (10.1±6.8) μm/d, and of the three-dimensional tooth movement was (20.5±9.7) μm/d, respectively. The speed of mesial-distal and buccal-lingual tooth movements were larger in female than in male (P<0.05). The speed of three-dimensional tooth movement was slightly larger in female than in male, while there was no significant difference between different genders (P>0.05). Conclusion: The three-dimensional position of posterior teeth changed after losing the interproximal and occlusal contacts in adults. The female had more significant and faster tooth movement than the male.

Key words: Adult, Dental arch, Tooth, Movement

CLC Number: 

  • R783

Figure 1

Measurement of buccal-lingual tooth movement A, two dimensional cross section; B, black lines indicate the distances of tooth movement."

Table 1

Main characteristics of the cases"

Items Value
Gender, n Female 10
Male 10
Age/years, $\bar{x} \pm s$ Female 27.9±5.0
Male 31.0±4.6
Average 29.5±4.9
Elapsed time /d, $\bar{x} \pm s$ Female 11.4±3.2
Male 10.4±2.0
Average 10.9±2.7

Table 2

The amount of tooth movement after losing interproximal and occlusal contacts ($\bar{x} \pm s$)/μm"

Item Mesial-distal Buccal-lingual Occlusal-gingival Three-dimensional
Female 170.1±37.1a 136.8±26.4a 114.3±68.3a 251.7±61.5a
Male 99.4±61.3b 83.8±32.3b 95.2±45.9a 171.1±57.1b
Average 134.8±61.2 110.3±39.5 104.8±57.5 211.4±71.0
P 0.006 0.001 0.472 0.007

Table 3

The speed of tooth movement after losing interproximal and occlusal contacts ($\bar{x} \pm s$)/(μm/d)"

Item Mesial-distal Buccal-lingual Occlusal-gingival Three-dimensional
Female 16.5±8.0a 12.8±4.1a 10.8±8.4a 24.0±11.2a
Male 9.6±6.2b 8.4±4.0b 9.5±5.2a 16.9±6.7a
Average 13.1±7.8 10.6±4.5 10.1±6.8 20.5±9.7
P 0.045 0.025 0.685 0.102
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