J Adv Prosthodont.  2017 Aug;9(4):315-320. 10.4047/jap.2017.9.4.315.

Analysis of crown size and morphology, and gingival shape in the maxillary anterior dentition in Korean young adults

• Song JW
• Leesungbok R
• Park SJ
• Chang SH
• Ahn SJ
• Lee SW

• KMID: 2398080
• DOI: http://doi.org/10.4047/jap.2017.9.4.315

Abstract

PURPOSE
The aim of this investigation was to analyze the dimensions of clinical crowns and to classify the crown and the gingival type in the anterior teeth in Korean young adults.
MATERIALS AND METHODS
Casts were obtained from 50 subjects ranging in age from 24 to 32. Measurements of length and width were made on the casts using a pair of digital calipers on the entire dentition. Crown thickness and papilla height were also measured and MDW/CL (mesiodistal width to clinical length) and CW/CL (cervical width to clinical length) ratios of the maxillary anterior teeth were calculated. The K-clustering method was used for CW/CL to classify the anterior tooth shape into three groups (tapered, ovoid, and square), and one-way analysis of variance and Duncan's post-hoc comparison were used to evaluate statistical significance between the groups. Pearson's correlation analysis was performed between tooth shape and papillary height (PH) to demonstrate the correlation between tooth shape and gingival morphological characteristics.
RESULTS
The average length of the maxillary central incisors was 9.89 mm; the mesio-distal width was 8.54 mm; and the ratio of width/length was 0.86 in Korean young adults. The average bucco-palatal thickness of the central incisor was 3.14 mm at the incisal 1/3 aspect. Ovoid type was the most common tooth shape (48%), followed by square type (29%) and taper type (23%) in the central incisors of Korean young adults. Tooth shape and gingival type were correlated with each other.
CONCLUSION
New reference data were established for tooth size in Korean young adults and the data show several patterns of tooth shape and gingival type. Clinicians should diagnose and treat based on these characteristics for better results in the Korean population.

Keyword

Tooth size; Tooth shape; Anterior teeth; Gingival type; Korean adult

MeSH Terms

Crowns*
Dentition*
Humans
Incisor
Methods
Tooth
Young Adult*

Figure

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  Fig. 1 Schematic illustration of the distances measured in the study. MDW: Mesiodistal width, CL: Crown length, CW: Cervical width of the crown, PH: height of interdental papilla.

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  Fig. 2 The thickness of anterior incisors was measured at the border between the middle 1/3 and the incisal 1/3.

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