J Korean Acad Prosthodont.  2015 Oct;53(4):310-317. 10.4047/jkap.2015.53.4.310.

A study on the validity of reference points for edentulous patient

• Park JJ
• Kim MJ

• KMID: 2118802
• DOI: http://doi.org/10.4047/jkap.2015.53.4.310

Abstract

PURPOSE
The purpose of this study was to evaluate the validity of reference points for edentulous patient by examining the correlation of teeth and face, and intraoral anatomic landmarks.
MATERIALS AND METHODS
We examined a facial outline, length, bizygomatic width, nasion - gnathion length, glabella - nasion distance in 270 men and 280 women satisfied with inclusion criteria from Seoul National School of Dentistry. The shape of maxillary central incisor, mesiodistal crown width and length of maxillary 6 incisors, distance from incisive papilla to labial surface of maxillary central incisor, and perpendicular distance from incisive papilla to intercanine line were measured in the stone model. We analyzed the ratio and relevant relation statistically.
RESULTS
The probability on having the same shape of face and the relative same shape maxillary incisor was 55.56% and 46.43% for men and women. The facial length proved to be a more valuable measurement in women in the tooth selection. The ratio of bizygomatic width to mesiodistal width of maxillary central incisor, and the ratio of bizygomatic width to width of maxillary 6 incisors were 16.8 : 1 and 3.0 : 1 and were positively correlated with each other. The distance of the canines from the maxillary incisal papilla was 1.33+/-1.28 mm. The distance between the center of the incisal papilla and the labial surface of their maxillary central incisor was 9.23+/-1.20 mm.
CONCLUSION
It was showed that anatomical reference points in tooth selection and arrangement for edentulous patient are useful and have validity in our limited study.

Keyword

Anatomic landmark; Facial outline; Clinical crown length & width; Correlation efficiency; Validity

MeSH Terms

Anatomic Landmarks
Crowns
Dentistry
Female
Humans
Incisor
Male
Palate
Seoul
Tooth

Figure

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  Fig. 1. Face measuring instrument.

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  Fig. 2. The subject distribution on the distance from the center of incisive papilla to labial surface of maxillary central incisor.

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  Fig. 3. The subject distribution on the perpendicular distance from the center of incisive papilla to intercanine line.

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  Fig. 4. The subject distribution on the ratio of bizygomatic width to mesiodistal width of maxillary central incisor.

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  Fig. 5. The subject distribution on the ratio of bizygomatic width to combined width of maxillary 6 anterior teeth.

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  Fig. 6. The subject distribution of the ratio of the facial length (trichion-gnathion) to crown length of the maxillary central incisor.

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