J Korean Acad Conserv Dent.  2010 Nov;35(6):429-435. 10.5395/JKACD.2010.35.6.429.

Study of endodontic working length of Korean posterior teeth

• Kim JY
• Lee SH
• Lee GH
• Park SH

• KMID: 2176464
• DOI: http://doi.org/10.5395/JKACD.2010.35.6.429

Abstract

OBJECTIVES
The aim of this study was to investigate average working lengths of Korean posterior teeth and evaluate validity of endodontic file length.
MATERIALS AND METHODS
The endodontic working length of the posterior teeth of 670 Korean patients were measured than each mean value and standard deviation were investigated than the frequency deviation and standard deviation per each length were calculated.
RESULTS
Among the canals of premolar, 66.5% of canal length was marked under 20 mm by endodontic working length and 95.4% could be measured under 22 mm and Among the canals of molars, 95.5% of canal length was marked under 20 mm endodontic working length.
CONCLUSIONS
With the result of measurement of endodontic working length of premolars of Korean, it suggested that 23 mm endodontic file is more proper than the 21 mm and 25 mm file on the market.

Keyword

Molar; Ni-Ti file; Premolar; Working length

MeSH Terms

Bicuspid
Humans
Molar
Tooth

Figure

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  Figure 1 The number of canals classified by length in premolar. Frequency distribution and normal distribution.

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  Figure 2 The number of canals classified by length in molar. Frequency distribution and normal distribution.

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