Quick White美白胶漂白氟斑牙的临床效果

目的:临床观察QuickWhite美白胶对氟斑牙患者的漂白治疗效果。方法:选取63例I￣III级不同程度的氟斑牙患者,采用QuickWhite美白胶进行漂白治疗,分别于治疗前及治疗后用Vita比色板对牙齿比色并记录,评价治疗效果。评价标准:治疗后无改变为无效,变白2个色阶为有效,变白3个色阶以上为显效。结果:使用QuickWhite美白胶治疗后,I级患者显效率为95.6%,II级患者显效率为50%。结论:QuickWhite美白胶可为氟斑牙患者提供可靠的漂白治疗效果。     

Graded changes in enamel component volumes resulted from a short tooth bleaching procedure

AimTo test the hypothesis that changes in enamel component volumes (mineral, organic, and water volumes, and permeability) are graded from outer to inner enamel after a short bleaching procedure.Materials and methodsExtracted unerupted human third molars had half of their crowns bleached (single bleaching session, 3 × 15 min), and tooth shade changes in bleached parts were analyzed with a spectrophotometer. Ground sections were prepared, component volumes and permeability were quantified at histological points located at varying distances from the enamel surface (n = 10 points/location), representing conditions before and after bleaching.ResultsTooth shade changes were significant (p < 0.001; 95% CI = −1/−8; power = 99%), and most of the enamel layer was unaffected after bleaching, except at the outer layers. Multiple analysis of covariances revealed that most of the variance of the change in enamel composition after bleaching was explained by the combination of the set of types of component volume (in decreasing order of relevance: mineral loss, organic gain, water gain, and decrease in permeability) with the set of distances from the enamel surface (graded from the enamel surface inward) (canonical R² = 0.97; p < 0.0001; power > 99%).ConclusionsChanges in enamel composition after a short bleaching procedure followed a gradient within component volumes (mineral loss > organic gain > water gain > decrease in permeability) and decreased from the enamel surface inward.     

渗透树脂对树脂充填体釉质边缘漂白后微渗漏的影响研究#br#

目的    研究渗透树脂对树脂充填体釉质边缘漂白后微渗漏的影响。方法    选择由郑州大学第一附属医院口腔颌面外科门诊提供的因阻生而拔除的第三磨牙45颗,并在其颊面颈部制备V类洞。将所有离体牙随机分为3组,每组15颗,根据操作方法分别记为树脂充填组、树脂充填+冷光美白组和树脂充填+冷光美白+渗透树脂组。3组离体牙充填后进行500次冷热温度循环,然后在2%的碱性品红溶液中浸泡24 h,把离体牙沿颊舌向纵向剖开,用体式显微镜观察,并用S-EYE软件测量染料渗透深度。结果    3组染料渗透深度总的比较,差异有统计学意义（H = 10.182,P < 0.05）。其中,树脂充填+冷光美白组染料渗透深度大于树脂充填组和树脂充填+冷光美白+渗透树脂组,差异均有统计学意义（P < 0.05）;树脂充填+冷光美白+渗透树脂组染料渗透深度与树脂充填组相比,差异无统计学意义（P > 0.05）。结论    漂白剂加重了树脂充填体边缘的微渗漏,同时渗透树脂的应用能有效减少漂白剂对树脂充填体边缘微渗漏的影响。     

漂白剂对玻璃离子水门汀类材料充填Ⅴ类洞边缘微渗漏的影响

目的评估漂白凝胶和洁白牙贴对3种不同的玻璃离子水门汀类材料边缘微渗漏的影响。方法在45颗离体健康前磨牙的颊舌侧制备Ⅴ类洞,随机分为A、B、C组,分别使用加强型玻璃离子水门汀KetacTM Molar Easymix、复合体F2000、复合体Dyract AP充填,每个大组再分为3个亚组,第1组和第2组分别使用质量分数14％过氧化氢（HP）洁白牙贴和10％过氧化脲（CP）凝胶进行漂白,第3组为对照组。所有样本置入37 ℃蒸馏水中保存7 d后冷热循环500次,然后进行漂白。漂白21 d后置于碱性品红溶液中染色24 h,沿牙体长轴通过充填体中央颊舌向剖开牙齿,体视显微镜下观察并测量染料渗入窝洞壁的深度。结果2种漂白方式对充填体边缘微渗漏的影响没有明显差异（P>0.05）;与对照组相比,2种漂白方式对B、C组的微渗漏均没有产生明显影响（P>0.05）,但均可使A组的微渗漏增加（P<0.05）。结论10％CP凝胶和14％HP洁白牙贴对充填体边缘微渗漏的影响无明显差异;漂白不会影响复合体的微渗漏,但会增加加强型玻璃离子水门汀的微渗漏。