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Objective: to investigate the Hunan Province, more than 15-year-old resident wedge-shaped defects (wedge-shaped defect) Prevalence and betel nut chewing to understand the distribution of the wedge-shaped defects and chewing betel nuts and dental wedge-shaped defects relations . Method: In accordance with the requirements of the third national oral health epidemiological survey , taken grading quota random cluster sampling method , hierarchical sample household as a unit random cluster sampling , conducted house-to-house survey . Survey to investigate the residents and betel nut chewing , and oral examination in order to observe the wedge-shaped defect occurrence , analysis of the wedge-shaped defect distribution characteristics of different gender , age, education level , and residents comparative survey of residents and long-term the incidence of betel nut chewing with non - betel nut chewing wedge-shaped defect . Results: 2123 cases of residents in Hunan Province , 767 cases of patients with wedge-shaped defects , wedge-shaped defect prevalence was 36.1% ; prevalence rate for male 423 / 1098 (38.5 %) , 344 / 1025 (33.6 % ) females , both comparison, P lt ; 0.05 , with a statistically significant difference , the male prevalence was significantly higher than that of women ; 10 -year-old age group , wedge-shaped defect prevalence increases with age , there is a significant difference ( P lt ; 0.05 ) ; affected by the level of primary education by wedge-shaped defect prevalence rate of 45.7% , by the level of secondary education and 34.3% by the University level of education (31.6%) , the former compared to the latter two have significant differences ( P lt ; 0.05 ) , the latter two was no statistical difference ( P gt ; 0.05) : The residents of betel nut chewing rate of 313 / 2123 ( 14.8% ), betel nut chewing by wedge-shaped defects prevalence ( 99 / 313 ) (31.6% ) The wedge-shaped defect prevalence ( 668 / 1810 ) ( 36.9% ) non - betel nut chewing , no significant differences ( P gt ; 0.05 ) . Conclusion: The prevalence of Hunan Province, residents of the wedge-shaped defect rate was 36.1% , wedge-shaped defect incidence , gender , age, educational level . Men than women ; older wedge-shaped defects higher prevalence ; lower level of education , the higher the prevalence of the wedge-shaped defects ; However, chewing betel nut no apparent impact on the prevalence of the wedge-shaped defects .
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