Journal of Shandong University (Health Sciences) ›› 2019, Vol. 57 ›› Issue (7): 108-113.doi: 10.6040/j.issn.1671-7554.0.2019.406

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Analysis of dental and basal arch forms of 16 individual normal occlusions using three-dimensional evaluation

LI He1, LU Lu2, GUO Jing2   

  1. 1. Department of Stomatology, Beijing Jishuitan Hospital, Beijing 100035, China;
    2. Department of Orthodontics, School of Stomatology, Shandong University, Jinan 250012, Shandong, China
  • Published:2022-09-27

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Abstract: Objective To investigate the relationship between dental and basal arch forms in individual normal occlusion, and to establish the normal value between the facial-axis(FA)point and Will Andrews and Larry Andrews(WALA)point in Shandong population. Methods A total of 16 individual normal occlusions were selected. The FA points and WALA points were marked on the plaster casts, which were then scanned to obtain the digital data. Curves of dental arch and basal arch forms were illustrated. The distance between the FA points and WALA points was measured. Results The FA and WALA curves were sporadic, which could not be described with same curve. The dispersion degree of the molar area was large. The correlation between the FA and the WALA points in the intercanine width (r=0.700), intermolar width (r=0.805), and intercanine width to intermolar width (r=0.625)were highly significant. In our sample, the mean value of the distance between the FA points and WALA points from central incisor to second molar were(-1.53±0.92)mm,(-0.97±1.11)mm,(0.65±0.90)mm,(1.17±0.64)mm,(2.13±0.93)mm,(3.12±0.72)mm, and(3.55±0.54)mm. Conclusion Both the FA and WALA point-derived arch forms are unique and can not be defined by a generalized shape. The WALA points can be a useful predictor of the dental arch form.

Key words: Individual normal occlusion, Three-dimensional measurement, Will Andrews and Larry Andrews Ridge, Dental arch form, Basal arch form

CLC Number: 

  • R783.5
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