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Journal of Peking University(Health Sciences) ›› 2020, Vol. 52 ›› Issue (1): 124-128. doi: 10.19723/j.issn.1671-167X.2020.01.020

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Analysis of the relationship among maxillary anterior teeth width, anterior arch perimeter and anterior segment depth

Peng WANG1,2,Da-jun LI1,3,Jian-zhang LIU()   

  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. Department of Prosthodontics, Dalian Stomatological Hospital, Dalian 116021, Liaoning, China
    3. Yuhua Meinuo Dental Clinic, Shijiazhuang 050000, China
  • Received:2018-09-16 Online:2020-02-18 Published:2020-02-20
  • Contact: Jian-zhang LIU E-mail:liujianzhang@bjmu.edu.cn
  • Supported by:
    Supported by the National Key Clinical Specialty Construction Project of China(2011);the New Clinical Technology Program of Peking University Hospital and Stomatology(PKUSSNCT-16A11)

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Abstract:

Objective: To analyze the relationship between the width of the maxillary anterior teeth and the anterior arch perimeter, to analyze the change rule of the width of the anterior teeth and the anterior arch perimeter, when altered the convexity of the anterior arch, with the width of the maxillary anterior arch keeping constant, and to provide a reliable basis for later digitized and personalized aesthetic analysis of front teeth. Methods: In the study, 61 front teeth complete and well-arranged models had been selected from the working models after the prostheses in Department of Prosthodontics, Peking University School and Hospital of Stomatology, including 22 male models and 39 female models. A photograph was taken from the occlusal surface of each model using the fixed magnification with a single lens reflex camera. The width of anterior teeth, the width of anterior arch and the convexity of anterior arch had been measured using the Photoshop software. The ratio of the width of the anterior teeth to the width of the anterior arch was calculated. Keeping the width of anterior arch unchanged, the layer free transformation function used to add or decrease the curvature of the anterior arch from 1-5 mm, each circumfe-rence of the anterior arch was measured. According to the proportion of their anterior teeth in the anterior arch perimeter, the width of each anterior teeth crown under different convexities of anterior arch was calculated. SPSS 23.0 was used to analyze the ratio of the width anterior teeth to the anterior arch perimeter and correlation between the convexity of the anterior arch and the width of the anterior teeth. Results: The percentages of the median length of the anterior arch in the central incisor, lateral incisor and canine were 36.2%±1.3%, 30.2%±1.5%, and 33.6%±1.4%, respectively. The proportions were normal distributions and not related to the perimeter of the anterior arch. When the width of the anterior arch was constant, there was a positive correlation between the convexity of anterior arch in the range of 5 mm and the width of anterior teeth or the front arch circumference. With each increase or decrease of 1 mm of the convexity of anterior arch, the width of the middle incisor increased or decreased by about 0.18 mm, the half circumference of the anterior arch increased or decreased by about 0.50 mm. Conclusion: The width of the anterior teeth in the middle-distal direction remained stable in the anterior arch circumfe-rence. Within a certain range, when the width of the maxillary anterior arch remains unchanged, the width of the anterior teeth and the perimeter of the anterior teeth are positively correlated to the convexity of the anterior arch.

Key words: Maxilla, Odontometry, Esthetics, dental, Incisor, Cuspid

CLC Number: 

  • R783

Figure 1

Use the Polygonal Lasso Tool of the Photoshop software tracing the high point of anterior teeth and approximal point, measure the width of anterior teeth, the width of anterior arch and the convexity of anterior arch L1, width of central incisor; L2, width of lateral incisor; L3, width of canine; D, convexity of anterior arch; W, width of the anterior arch."

Figure 2

Keeping the width of anterior arch unchanged, use the layer free transformation function of the Photoshop software to add or decrease the convexity of the anterior arch from 1-5 mm"

Figure 3

The proportions of the width of central incisor in the half of the anterior arch perimeter were normal distribution SD, standard deviation."

Figure 4

There was a positive correlation between the convexity of anterior arch (D) in the range of 5 mm and the width of anterior teeth (L1) or the half of the anterior arch perimeter (R)"

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