Effects of bonding after microabrasion with normal acid etching time on losing ratio of orthodontic brackets to dental fluorosis
10.3760/cma.j.issn.2095-4255.2016.10.017
- VernacularTitle:磨除后酸蚀对氟斑牙正畸托槽脱落率的影响
- Author:
Jing DONG
;
Zhezhan ZHANG
- Publication Type:Journal Article
- Keywords:
Dental fluorosis;
Orthodontic treatment;
Bonding;
Losing ratio of brackets
- From:
Chinese Journal of Endemiology
2016;35(10):772-775
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the effects of losing ratio of orthodontic brackets bonding after prolonged etching time (prolonged etching time method) and microabrasion with normal acid etching time (etching after microabrasion method) to different degree of dental fluorosis.Methods A total of 30 patients with dental fluorosis were selected from the cases treated in the Department of Stomatology,Lianyungang Hospital of Traditional Chinese Medicine.They were classified as 3 groups from mild to severe degree according to Dean's criteria,10 people per group.Patients within each group were randomly assigned to 2 subgroups,5 people per subgroup;prolonged etching time method and etching after microabrasion method were used,respectively,in each subgroup.The total and first losing ratios of brackets at five time points (1,2,4,12 and 24 weeks) were observed.The losing ratio differences of orthodontic brackets between the two disposing measures bonding to different degree of dental fluorosis were analyzed.Resuts The total bracket loss rates were 38.3％ (46/120) and 21.4％ (25/117),respectively,in severe dental fluorosis disposed by prolonged etching time method and etching after microabrasion method.It was significantly higher than that of the same processing method of mild and moderate dental fluorosis groups,in which the total bracket loss rates were 12.5％ (15/120),18.1％ (21/116),7.6％ (9/118) and 5.8％ (7/120),respectively,and the differences were statistically significant (x2 =21.12,11.87,8.96,12.24,all P ＜ 0.01).The total loss rate of etching after microabrasion method was lower than that of prolonged etching time method in mild dental fluorosis group,the difference was not statistically significant (x2 =1.56,P ＞ 0.05).The total loss rates of etching after microabrasion method were lower than that of prolonged etching time method in moderate and severe dental fluorosis groups,and the differences were statistically significant (x2 =8.49,8.13,all P ＜ 0.05).The medians of first bracket loss rates were 8.3％ and 4.3％,respectively,in severe dental fluorosis disposed by prolonged etching time method and etching after microabrasion method.They were significantly higher than that of the same processing method of mild and moderate dental fluorosis groups,in which the medians of first bracket loss rates were 2.5％,4.3％,1.7％ and 0.8％,respectively,and the differences were statistically significant (U =2.619,2.627,2.312,2.627,all P ＜ 0.05).The average percentage of first bracket loss rates of etching after microabrasion method was lower than that of prolonged etching time method in mild dental fluorosis group,the difference was not statistically significant (U =-0.949,P ＞ 0.05).The average percentages of first bracket loss rates of etching after microabrasion method were lower than those of prolonged etching time method in moderate and severe dental fluorosis groups,and the differences were statistically significant (U =-2.214,-2.410,all P＜ 0.05).Conclusions Whether in prolonged etching time method subgroup or etching after microabrasion method subgroup,the more serious injury of dental fluorosis is,the higher loss rate of orthodontic bracket will be.For the clinical treatment of mild and severe dental fluorosis,the effect of etching after microabrasion method is better than prolonging etching time method.
