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Lee, Ju, Park, Oh, and Lee: Dental health capacity of the first permanent molars among children and adolescents in Korea for the year 2010
Original Article

J Korean Acad Oral Health 2013;37(2):103-109.

Published online: 12 June 2013

DOI: https://doi.org/10.11149/jkaoh.2013.37.2.103

Dental health capacity of the first permanent molars among children and adolescents in Korea for the year 2010

Sun-Ho Lee1, Hyun-Jeong Ju1, So-Young Park1, Hyo-Won Oh1, 2, Heung-Soo Lee1, 2

1Department of Preventive and Public Health Dentistry, Wonkwang University College of Dentistry, Iksan, Korea

2Institute of Wonkwang Dental Research, Wonkwang University, Iksan, Korea

Corresponding Author: Heung-Soo Lee Department of Preventive and Public Health Dentistry, Wonkwang University College of Dentistry, 460 Iksandae-ro, Iksan 570-749, Korea Tel: +82-63-850-6851 Fax: +82-63-850-6851 E-mail: smagn@wonkwang.ac.kr

Received 30 May 2013       Revised 20 June 2013       Accepted 20 June 2013

Copyright © 2013 Journal of Korean Academy of Oral Health

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objectives

The purpose of this study was to estimate the dental health capacity of the first permanent molars among children and adolescents in Korea and to assess its related factors.

Methods

Cross-sectional data were obtained from the Korea National Oral Health Survey (2006 and 2010). The subjects of the present study included a total of 34,975 people aged 6, 8, 10, 12, and 15 years (5,347 in 2006 and 29,628 in 2010). The dental health capacity of the first permanent molars was calculated using Clune’s methods. Changes in dental health capacity were analyzed according to year, age, sex, and region. We used a multiple regression model to identify relevant factors for dental health capacity of the first permanent molars.

Results

The dental health capacity values were calculated according to age group as follows: 6 years, 99.66%; 12 years, 96.50%; and 15 years, 95.24%. The dental health capacity in 2010 was estimated to be higher than that in the year 2006. The increment rate of dental health capacity was higher for girls than for boys. The dental health capacity of the first permanent molars was related to the following factors: year, age, sex, region, perceived oral health status, frequency of tooth brushing per day, frequency of cariogenic snack intake per day, and number of teeth with pit and fissure sealant. Among these factors, number of teeth with pit and fissure sealant had the greatest effect on the dental health capacity of the first permanent molars.

Conclusions

The dental health capacity of the first permanent molars was higher in rural areas than in the metropolis and cities. Therefore, the pit and fissure sealant program, apart from the health insurance coverage, must be revitalized for children and adolescents in rural areas.

Keywords: Dental caries, Epidemiology, Korea National Oral Health Survey, Molar

References

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Table 1.
Change of dental health capacity of the first permanent molars
Age (yrs) 2006 year 2010 year Rate of increase P-value
N (%) Mean±SD* N (%) Mean±SD* (%P)
6 925 (17.3) 99.52±1.75 5,786 (19.5) 99.66±1.43 0.14 0.022
8 875 (16.4) 98.50±3.05 5,732 (19.3) 98.74±2.71 0.24 0.027
10 888 (16.6) 97.40±4.44 5,759 (19.4) 97.49±3.98 0.09 0.564
12 1,754 (32.8) 95.95±6.19 6,252 (21.1) 96.50±4.82 0.57 0.001
15 905 (16.9) 94.45±7.43 6,099 (20.6) 95.24±5.98 0.84 0.002
Total 5,347 (100) 96.97±5.49 29,628 (100) 97.49±4.43 0.54 <0.001

*Values mean %, P-value determined by independent sample t-test.

Table 2.
Change of dental health capacity of the first permanent molars according to gender
Gender 2006 year 2010 year Rate of increase P-value
N (%) Mean±SD* N (%) Mean±SD* (%P)
Male 2687 (50.3) 97.40±4.98 15632 (52.8) 97.73±4.24 0.34 0.001
Female 2660 (49.7) 96.54±5.94 13996 (47.2) 97.21±4.62 0.69 <0.001

*Values mean %, P-value determined by independent sample t-test.

Table 3.
Change of dental health capacity of the first permanent molars according to region
Region 2006 year 2010 year Rate of increase P-value
N (%) Mean±SD* N (%) Mean±SD* (%P)
Metropolis 2,441 (45.6) 97.13±5.05 13,098 (44.2) 97.49±4.20 0.37 0.001
Cities 2,395 (44.8) 96.98±5.66 12,281 (41.5) 97.57±4.39 0.61 <0.001
Rural area 511 (9.6) 96.21±6.59 4,249 (14.3) 97.21±5.18 1.04 0.001

*Values mean %, P-value determined by independent sample t-test.

Table 4.
Change of dental health capacity of the first permanent molars according to location
Tooth type 2006 year 2010 year Rate of increase P-value
N Mean±SD* N Mean±SD* (%)
Maxillary right first molars (#16) 5,348 9.75±0.63 29,629 9.79±0.50 0.41 <0.001
6 925 9.97±0.20 5,782 9.98±0.14 0.10 0.080
8 875 9.88±0.39 5,732 9.90±0.32 0.20 0.232
10 887 9.78±0.56 5,759 9.79±0.46 0.10 0.465
12 1,751 9.67±0.69 6,253 9.70±0.56 0.31 0.041
15 900 9.54±0.91 6,099 9.58±0.70 0.42 0.193
Maxillary left first molars (#26) 5,347 9.75±0.66 29,630 9.78±0.54 0.31 0.001
6 925 9.97±0.21 5,782 9.98±0.15 0.10 0.046
8 875 9.88±0.36 5,732 9.91±0.31 0.30 0.019
10 887 9.79±0.47 5,760 9.79±0.48 0.00 0.639
12 1,750 9.67±0.73 6,253 9.69±0.58 0.21 0.190
15 900 9.52±0.99 6,099 9.57±0.80 0.53 0.102
Mandibular left first molars (#36) 5,348 9.64±0.84 29,629 9.71±0.65 0.73 <0.001
6 925 9.94±0.24 5,782 9.95±0.24 0.10 0.136
8 875 9.81±0.49 5,732 9.84±0.37 0.31 0.075
10 887 9.70±0.61 5,760 9.71±0.56 0.10 0.645
12 1,751 9.51±1.00 6,252 9.60±0.74 0.95 0.001
15 900 9.37±1.17 6,099 9.47±0.92 1.07 0.012
Mandibular right first molars (#46) 5,348 9.65±0.81 29,630 9.72±0.62 0.73 <0.001
6 925 9.94±0.25 5,782 9.95±0.23 0.10 0.061
8 875 9.83±0.43 5,732 9.85±0.37 0.20 0.216
10 887 9.69±0.60 5,760 9.71±0.54 0.21 0.261
12 1,751 9.53±0.95 6,253 9.61±0.68 0.84 0.001
15 900 9.35±1.14 6,099 9.48±0.89 1.39 0.001

*Values mean score, P-value determined by independent sample t-test.

Table 5.
Multiple regression model for dental health capacity of the first permanent molars
Independent variables Model 1 Model 2 Model 3
β P-value β P-value β P-value
Socio-demographic factors
Year (2010) 0.036 <0.001 0.031 <0.001 - -
Age ―0.178 <0.001 ―0.145 <0.001 ―0.115 <0.001
Gender (male) 0.088 <0.001 0.068 <0.001 0.061 <0.001
Region (rural)* ―0.042 <0.001 ―0.032 <0.001 ―0.053 <0.001
Oral health behavior factors
Perceived oral health status 0.206 <0.001 0.181 <0.001
Frequency of tooth brushing per day ―0.030 <0.001 ―0.033 <0.001
Frequency of cariogenic snack intake per day ―0.022 0.003 ―0.017 0.013
Preventive treatment
Number of sealant teeth applied on the pit and fissure 0.286 <0.001
Adjusted R2 0.041 0.081 0.160

*Criteria variable is cities region. P-value determined by multiple regression. ‘-’ is not statistically significant.

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