Effect of using bleaching materials on bovine enamel hardness
10.3760/cma.j.issn.1002-0098.2013.s1.029
- VernacularTitle:过氧化物漂白对牙釉质维氏硬度影响的实验研究
- Author:
Dian-Yun ZHANG
1
;
Hong LIN
;
Gang ZHENG
;
Jian-Min HAN
;
Rui ZHENG
Author Information
1. 100081,北京大学口腔医学院·口腔医院口腔材料研究室
- Keywords:
Tooth bleaching agents;
Peroxides;
Dental enamel;
Hardness
- From:
Chinese Journal of Stomatology
2013;48(z1):129-132
- CountryChina
- Language:Chinese
-
Abstract:
Objective To observe the change rate of tooth hardness after tooth bleaching materials being applied on tooth one time,and to investigated the relationship between peroxide concentration and the enamal hardness reduction as well as the relationship between prolonged whitening time and the enamal hardness reduction.Method Freshly extracted bovine teeth were ground to get flat surfaces in enamel,then the smooth enamel surface was divided into two equal parts,one part was the experimental area and the other part was blank control area.The bleaching material was applied once on the experimental area,then the Vickers hardness change rate of both the experimental and the control area was calculated.Result When bleaching materials were applied according to the manufacture's instructions,no significant decrease in the enamel hardness was detected after using bleaching materials with urea peroxide concentration of 10％,16％,22％,25％,30％,or bleaching materials with urea peroxide concentration of 10％,15％,20％ but contained 0.25 ％ sodium peroxied,or bleaching materials with hydrogen peroxide concentration of 10％ and 35 ％.But the enamal hardness change rate increased as the peroxide concentration increased,and also as the bleaching time increased.Conclusious There is no significant differences between the hardness of the unbleached and the bleached tooth when using the bleaching materials according to the manufacture's instructions.But with the increase of whitening time,the hardness will change.
