| Objective:Through the investigation of the situation of the tooth abrasion and betel nut chewing of the over 15 years-old and 15 years-old people, so as to study the relationship between the tooth abrasion and the situation of the age, sex, betel nuts chewing. Provide scientific basis for the cause and prevention of tooth abrasion.Methods:According to the standard of the third national oral health epidemiological investigation, the use of quota random sampling method classification of samples taken, then taken Hunan east, west, south, north, central five cities:Changsha, Hunan Tujia and Miao Autonomous Prefecture, Yongzhou City, Changde City, Loudi City area a total of 2200 residents. By way of questionnaire survey was chewing betel nut extract the object, and to conduct oral examination, tooth abrasion using Smith and Knight TWI indexing method, records of respondents in the mouth tooth abrasion.Results:①In the 2200 residents,a total of 1790 questionnaires were completed, the completion rate was 81.36%, male 946, female 844. Male to female ratio 1.1:1, a total of 44,584 tooth was checked. In the 1790 residents,286 residents have chewing betel and betel nut chewing was 16.0%.②Hunan adult prevalence of tooth abrasion is (1743/1790) 97.60%, per persion has 24.91 worn tooth. The number of worn tooth aboveⅡ°are 18,729, accounting for 38.55%, per persion has 10.46 worn tooth,Ⅲ°worn tooth is 1106, accounting for 2.28%, per persion has 0.62.③There is a linear relationship between tooth abrasion and age. (P <0.05). In theⅡ°worn tooth,56 age group have the highest prevalence was 55.34%. In theⅢ°worn tooth,66 age group have the highest prevalence of 9.65%.④The men's tooth abrasion is higher than the women's (P<0.05). Men'sⅡ°,Ⅲ°abrasion prevalence rates were 39.55%,3.03%. Women'sⅡ°,Ⅲ°abrasion prevalence rates were 32.6% and 1.43% respectively.⑤286 people,who have the habit of betel nut chewing, the minimum age of 15, maximum 81 years, mean age 36.22 years, the average frequency of chewing betel nut is 9.97 mouth/ day, chewing capacity of≤20 and 76, accounting for 26.57%, the highest percentage. Tooth abrasion increased with the amount of chewing betel nut heavier (P<0.05).⑥The abrasion of people who chew betel nut is higher than the people who don't(P<0.05). Chewing betel nutⅡ°wear prevalence rate (42.80%) than those who did not chew betel nut (35.16%), P<0.05.Ⅲ°chewing betel nut wear prevalence rate (4.55%) higher than that chewing betel quid (2.09%), P<0.05.⑦Different teeth has the different abrasion is mandibular central incisors, mandibular first molar> first molar, mandibular lateral incisor, mandibular canine> mandibular second molar> second molar, maxillary canine> lower first premolars and mandibular second premolar> upper first premolars, maxillary second premolars> maxillary incisors> maxillary lateral incisor. Molars, canines> incisor> premolars.Conclusion:①Tooth abrasion with age and heavier.②The male's tooth abrasion higher than the female's.③Betel nut chewing related tooth abrasion, tooth abrasion increased with the amount of chewing betel nut and worse.④Different teeth of different tooth abrasion, mandibular first molar and mandibular incisor the abrasion are the most.
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