| Objective To analyze the incidence of the first molar caries in children aged from 7 to9 years old in Tangshan and factors related, so that we could provide basis for the prevention and treatment of dental caries.Methods Based on the economic and effective principle and the method which had been used in the Third National Oral Health Investigation, 1794 students aged from 7 to 9were selected stochastically. Oral status was examined according to the oral health investigation(4th edition) and the Third National Oral Health Investigation. The first molar was examined with instruments, such as the mirror and probe. The results of examination was recorded. At the same time, a questionnaire was designed refered to Third National Oral Health Investigation. Questionnaire documents of 1794 children were collected in this study. Epidata3.1 was adopted to establish the database, employing SPSS 17.0 analysis. x2 test and Logistic regression analysis were separately carried on the statistical analysis.Results 1 First molar: Caries in first molar was found in 852 of 1794 children. The total prevalence of caries was 47.49%, the mean DMFT(decayed,missing and filled teeth)value was 1.30±1.59, the mean DMFS(decayed, missing and filled surfaces) value was1.84±2.55. In the 450 with caries of 899 female children, the prevalence of caries was50.06%, the mean DMFT value was 1.38±1.60 and the mean DMFS value was 1.90±2.47. While in 402 of 895 male children, the prevalence of caries was 44.92%, the mean DMFT value was 1.22±1.57 and the mean DMFS value was 1.78±2.62. The prevalence of first molar caries and the mean DMFT value of male was significantly lower than that of female. There was significant difference of the prevalence of first molar caries, the mean DMFT value and the mean DMFS value among different age groups. Missing rate of the first molar was 0.45%. Missing rate among different age groups had statistical significance. Filling rate of first molar was 2.35%,Filling rate among different age and gender groups haven’t statistical significance. 2 Primary tooth: The number of caries of1794 samples was 1491, the prevalence of caries was 83.11%, the mean dmft value was4.82±3.55, the mean dmfs value was 6.51±5.61. There was also significant difference of the mean dmft value and the mean dmfs value among different age groups.3 The correlation of the first molar and primary tooth caries: primary tooth caries was the risk factor of first molar caries. Noted correlation was found between the primary teeth caries and first molar. 4 Single factor analysis results: The factors below were related to first molar caries: the number of brushing teeth every day, technique of brushing teeth, replace toothbrush time, toothbrush placement method, toothpaste with fluoride, eating fresh fruit,eating sodas, sweets increase the risk of a dental decay occurrence, bacterial infections lead to teeth decay occurrence, brushing teeth remove plaque, PFS(Pit and Fissure Sealant) prevent dental caries, interval of oral examination, regular oral examination, the function of brushing teeth, parents’ education and household income. 5 Multiple factors analysis results: Risk factors of first molar caries included the number of brush teeth every day, eating sodas, toothpaste with fluoride, parents’ education and household income.Conclusions 1 The prevalence of caries in first molar was 47.49% in children aged from 7 to 9 years old in Tangshan. The prevalence of female was higher than male. The prevalence was increasing along with the growth of the age. The filling rate was low. 2Primary tooth caries was a risk factor of first molar caries. Noted correlation was found between the primary teeth caries and the first molar. 3 Risk factors of first molar caries included brushing teeth every day the number, eating sodas, toothpaste with fluoride,parents’ education and household income. |
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