J Korean Acad Oral Health.  2015 Jun;39(2):88-94. 10.11149/jkaoh.2015.39.2.88.

Logistic regression analysis of factors affecting the survival of first molars in Korean adults

• Chung SS
• Kim JB
• Kim YS
• Jung YR
• Hong JS
• Kim JY
• Chang KW

• KMID: 2321513
• DOI: http://doi.org/10.11149/jkaoh.2015.39.2.88

Abstract

OBJECTIVES
This study aimed to analyze the variables affecting the survival of the four permanent first molars in an adult Korean population using logistic regression analysis.
METHODS
The Korean government has been collecting oral health data at the national level at 3-year intervals since 2000. In addition, a national survey was conducted in 2006 among 15,777 persons aged 2-95 years who were stratified by age, gender, and region. The relationship between each of nine objective variables and tooth survival was analyzed by frequency, cross-tabulation, and logistic regression analysis, with age, gender, and economic status as functional variables. The inclusion level was alpha=0.05 and the exclusion level was alpha=0.10. The nine variables were age, occupational status, monthly family income, gender, frequency of brushing the teeth, snack intake per day, presence of diabetes, education level, and smoking (packs per year).
RESULTS
The survival rate of the molars decreased with increased age. In individuals who engaged in farming, stock breeding, and fishing, the rate was 2-5 times lower than that of individuals in higher positions in terms of jobs and society. Furthermore, the survival rate for smokers was 5-10 percent lower, compared with non-smokers.
CONCLUSIONS
The most significant predictor of the survival rate of the four permanent molars in Korean adults was age, followed by jobs, smoking, and gender.

Keyword

first molar; Korean; logistic regression; tooth survival rate

MeSH Terms

Adult*
Breeding
Education
Employment
Humans
Logistic Models*
Molar*
Oral Health
Smoke
Smoking
Snacks
Survival Rate
Tooth
Smoke

Figure

• 

  Fig. 1. Survival rate of 4 molars. #16: maxillary right first molar, #26: maxillary left first molar, #36: mandibular left first molar, #46: mandibular right first molar. Survival rate= No. of all the present teeth /No. of examined teeth including any absent teeth×100 (%).

Reference

References

1. Lee SK, Lee KW, Chang KW. Reasons of extracted permanent teeth in Korean population. J Korean Acad Oral Health. 2001; 25:139–163.

2. Klock KS. Patients’ perceptions of the decision-making process leading to extraction of permanent teeth in Norway. Community Dent Oral Epidemiol. 1995; 23:165–169.

3. Eckerbom M, Magnusson T, Martinsson T. Reasons for and incidence of tooth mortality in a Swedish population. Endodont Dent Traumatol. 1992; 8:230–234.

4. Klock KS, Haugejorden O. Primary reasons for extraction of permanent teeth in Norway: changes from 1968 to 1988. Community Dent Oral Epidemiol. 1991; 19:336–341.

5. Morita M, Kimura T, Kanegae M, Ishikawa A, Watanabe T. Reasons for extraction of permanent teeth in Japan. Community Dent Oral Epidemiol. 1994; 22:303–306.

6. Reich E, Hiller KA. Reasons for tooth extraction in the western states of Germany. Community Dent Oral Epidemiol. 1993; 21:379–383.

7. Murray H, Locker D, Kay EJ. Patterns of and reasons for tooth extractions in gerneral dental practice in Ontario, Canada. Community Dent Oral Epidemiol. 1996; 24:196–200.

8. Ong G. Periodontal reasons for tooth loss in an Asian population. J Clin Periodontol. 1995; 23:307–309.

9. Angelillo IF, Nobile CGA, Pavia M. Survey of reasons for extraction of permanent teeth in Italy. Community Dent Oral Epidemiol. 1996; 24:336–340.

10. Choi SH, Shin SC, Kwon JH, Lyoo YJ, Kim IS, Chang YS, Cho JW. Dental health capacity of the first permeanent molars among Koreans. J Korean Acad Oral Health. 2005; 29:430–440.

11. Choi YH, Suh I, Nam JM, Oh DK, Son HK, Kwon HK. Associations of missing teeth with medical status. J Korean Acad Oral Health. 2002; 26:169–180.

12. Woo HB. Differences in healthy life expectancy by gender and education for middle-aged and older Koreans. Korean J Sociol. 2009; 43:165–187.

13. Lee SE. Differential life expectancy and the progressivity of the national pension system in Korea. Korean Soc Secur Stud. 2006; 22:217–240.

14. Lee HK, Shon KH. A Study on the causes of death that contributed the gaps of life expectancy among Korean and Japanese elderly. J Korean Gerontol Soc. 2005; 25:133–147.

15. Kim GS, Lee HJ, Kim YS, Jeon JG, Chang KW. Logistic regression analysis of factors affecting survival of permanent second molars in Korean adults. J Korean Acad Oral Health. 2013; 37:232–240.

16. Kim JB, Chung SS, Lee HJ, Kim YS, Jeon JG, Chang KW. Logistic regression analysis of factors affecting the survival of central incisors in Korean adults. J Korean Acad Oral Health. 2014; 87:263–269.

17. Kim YS, Lee CH, Kim SG, Chang KW. Dental Aesthetic Index (DAI) of Adolescent in Chollabukdo. J Korean Acad Oral Health. 2002; 26:303–312.

18. Han DH, Kim JB. The association between smoking and periodontitis: findings from the Korean National Oral Health Survey 2006. J Korean Acad Oral Health. 2009; 33:634–643.

19. Kim HY. Evaluation of effects of health behaviors and dental service use on the association between socioeconomic status and unmet dental treatment needs. J Korean Acad Oral Health. 2006; 30:85–94.

20. Bergstrom J. Periodontitis and smoking: an evidence-based appraisal. J Evid Based Dent Pract. 2009; 6:33–41.

21. Burt B. Research, science, and therapy committee of the American Academy of Periodontology. Position Paper: epidemiology of periodontal diseases. J Periodontol. 2005; 76:1406–1419.

22. Han GS, Kim YS, Kang JK, Hwang YS, Han DH, Bae KH. Dental hygiene and dental education: Relation of smoking and periodontal status among 30s-50s adults in metropolitan area. J Korean Acad Oral Health. 2008; 32:250–260.

23. Mun SJ, Chung WG, Kim NH. Changes in daily toothbrushing frequency among Korean adults from 2000 to 2006. J Korean Acad Oral Health. 2009; 33:183–191.

24. Koivusilta L, Honkala S, Honkala E, Rimpelae A. Toothbrushing as part of the adolescent lifestyle predicts education level. J Dent Res. 2003; 82:361–366.