CAJ | 학술논문

目的通过观察过氧化物漂白后牙齿的硬度变化,探讨过氧化物浓度、漂白时间对牙釉质维氏硬度的影响,以期为临床提供参考.方法取新鲜牛牙制成牙釉质平面,按近远中对称分为漂白区和对照区,使用不同质量分数(10％、16％、22％、25％、30％)的过氧化脲、含0.25％氟化钠的过氧化脲(过氧化脲质量分数分别为10％、15％、20％)对漂白区进行漂白处理或使用10％过氧化氢(漂白20 min,1、3、5、16h)和35％过氧化氢(漂白8、30 min,1、2、5h)漂白不同时间,每种处理的样本量均为5.测定牙釉质维氏硬度,计算硬度变化率.使用单因素方差分析进行统计学分析.结果不同质量分数过氧化脲或不同质量分数含氟化钠过氧化脲漂白后牙釉质维氏硬度与对照区的差异均无统计学意义(P＞0.05).10％过氧化氢漂白处理16 h后牙釉质维氏硬度(248±21)与对照区(299±32)的差异有统计学意义(P＜0.05).牙釉质硬度变化率随过氧化物浓度增加而增大.结论按使用说明对牙齿进行漂白不会造成牙釉质硬度显著降低.
목적 통과관찰과양화물표백후아치적경도변화,탐토과양화물농도、표백시간대아유질유씨경도적영향,이기위림상제공삼고.방법 취신선우아제성아유질평면,안근원중대칭분위표백구화대조구,사용불동질량분수(10％、16％、22％、25％、30％)적과양화뇨、함0.25％불화납적과양화뇨(과양화뇨질량분수분별위10％、15％、20％)대표백구진행표백처리혹사용10％과양화경(표백20 min,1、3、5、16h)화35％과양화경(표백8、30 min,1、2、5h)표백불동시간,매충처리적양본량균위5.측정아유질유씨경도,계산경도변화솔.사용단인소방차분석진행통계학분석.결과 불동질량분수과양화뇨혹불동질량분수함불화납과양화뇨표백후아유질유씨경도여대조구적차이균무통계학의의(P＞0.05).10％과양화경표백처리16 h후아유질유씨경도(248±21)여대조구(299±32)적차이유통계학의의(P＜0.05).아유질경도변화솔수과양화물농도증가이증대.결론 안사용설명대아치진행표백불회조성아유질경도현저강저.
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.