表面活性剂与氟化钠涂料对牙骨质表面显微硬度的体外研究

目的观察表面活性剂与氟化钠涂料防治根面龋与单独用氟化钠涂料或洗必泰涂料防龋效果的比较.方法测定离体牙釉-牙骨质界下4×4 mm开窗区分别经洗必泰与氟化钠涂料(简称氟泰涂料)、洗必泰涂料、氟化钠涂料等处理,观察进行矿化试验和抗龋试验后牙骨质表面的显微硬度.结果试验前后牙骨质表面硬度相比,氟泰涂料组、氟化钠涂料组均有显著差异,且氟泰组比氟化钠组硬度值显著增加.抗龋试验前后牙骨质表面显微硬度值相比,氟泰组、氟化钠组无显著差异.洗必泰组及对照组均有显著差异.结论用氟泰涂料可增强牙骨质表面硬度,与氟化钠组效果相同,但优于氟化钠组.     

表面活性剂加氟化钠涂料对牙骨质表面显微硬度的体外研究

目的 :探讨表面活性剂加氟化钠涂料防治根面龋是否优于单独用氟化钠涂料或洗必泰涂料。方法 :在离体牙釉 -牙骨质界下开窗 4mm× 4mm ,分别经洗必泰加氟化钠涂料 (简称氟泰涂料 )、洗必泰涂料、氟化钠涂料等处理后进行矿化实验和抗龋实验 ,然后测定各组牙骨质表面的显微硬度。结果 :3组矿化实验前、后牙骨质表面硬度相比 ,氟泰涂料组和氟化钠涂料组较洗必泰组均有显著差异 ,且氟泰组比氟化钠组硬度值显著增加。抗龋实验前、后牙骨质表面显微硬度值相比 ,氟泰组、氟化钠组无显著差异 ,洗必泰组、对照组均有显著差异。结论 :用氟泰涂料改善牙骨质表面硬度与氟化钠组具相同效果 ,且优于氟化钠组。     

氟化钠薄膜,氟化钠溶液对牛牙釉质表面显微硬度影响的对比 …

目的：探讨氟化钠薄膜防龋的可行性，方法：测量鲜鲜牛牙釉质块在经钠薄膜、氟化钠溶液中进行矿化试验和抗龋试验后的表面显微硬度。结果：矿化试验前、后的釉持表面显微硬度相比，用氟化钠薄膜组织增另率为２７．５％，用氟化钠溶液组增加率为２２．６％，抗龋试验前、后的釉质表面显微硬度相比，用氟化钠薄膜组降低率为２４．７％，用氟化钠溶液组降低率为２２．１％，空白对照组降低率６０．７％。结论：用氟化钠薄改善釉质表面显     

氟化钠薄膜、氟化钠溶液对牛牙釉质表面显微硬度影响的对比研究

目的：探讨氟化钠薄膜防龋的可行性。方法：测量新鲜牛牙釉质块在氟化钠薄膜、氟化钠溶液中进行矿化试验和抗龋试验后的表面显微硬度。结果：矿化试验前、后的釉质表面显微硬度相比，用氟化钠薄膜组增加率为２７．５％，用氟化钠溶液组增加率为２２．６％。抗龋试验前、后的釉质表面显微硬度相比，用氟化钠薄膜组降低率为２４．７％，用氟化钠溶液组降低率为２２．１％，空白对照组降低率为６０．７％。结论：用氟化钠薄膜改善釉质表面显微硬度，与氟化钠溶液具有相同效果，有可能作为一种便于使用的防龋的氟化物保护方法     

氟化钠泡沫和凝胶对牛牙釉质表面显微硬度的影响

目的：评价氟化钠泡沫和氟化钠凝胶对牛牙釉质表面显微硬度的影响。方法：采用新鲜牛牙釉质块为标本,应用显微硬度计测量分别采用氟化钠泡沫、氟化钠凝胶进行矿化试验和抗龋试验后的釉质块表面显微硬度。结果：试验前和矿化试验后的釉质表面显微硬度相比,使用氟化钠泡沫组增加率为54．41％－21．32％,使用氟化钠凝胶组增加率为47．26％－25．36％。试验前和抗龋试验后的釉质表面显微硬度相比,使用氟化钠泡沫组降低率为24．88％－33．19％,使用氟化钠凝胶组降低率为30．97％－38．66％,而空白对照组降低率为41．26％。结论：氟化钠泡沫对釉质表面显微硬度的影响和氟化钠凝胶相比无显著差异,用氟化钠泡沫改善釉质表面显微硬度与氟化钠凝胶具有相同效果。     

脉冲Nd:YAG激光加氟化钠液对人牙骨质抗酸性能影响的实验研究

1 .资料与方法 :将 2 4颗离体人恒前磨牙的牙骨质标本随机分成 4组 (每组 6颗 ) :①激光 +氟化钠组 :脉冲Nd :YAG激光治疗仪 (FriendlyA 4 0型 ,意大利 ) (激光参数 :能量密度 0 2 2J/mm2 )照射后 ,2 %NaF液处理 4min ;②激光组 :激光照射 ;③氟化钠组 :2 %NaF液处理 ;④空白组 :不作处理。每组各取 5个标本进行人工脱矿实验 ,钙离子选择性电极 (PCa 1型 ,罗素 ,上海 )测脱矿液中Ca2 + 溶出量。已脱矿的标本中每组各取 1个与未经脱矿的标本用扫描电镜(Amray 10 0 0B型 ,美国 )观察牙骨质表面形态。统计学处理 :采用单因素方差分析…     

慢性牙周炎患者前磨牙牙骨质的显微硬度分析

目的分析牙齿在慢性牙周炎症过程中牙骨质的物理性状变化情况。方法收集重度慢性牙周炎患者的10颗前磨牙作为牙周炎组,非牙周炎患者拔除的10颗前磨牙作为对照组。应用显微硬度分析技术比较两组牙颊侧牙骨质表面根尖、根中和根颈1/3显微硬度。结果牙周炎组牙骨质根颈1/3区段、根中1/3区段和根尖1/3区段的表面平均显微硬度分别为（0.342±0.019）GPa（、0.322±0.013）GPa和（0.311±0.016）GPa,对照组对应区域的平均显微硬度分别为（0.393±0.014）GPa（、0.338±0.015）GPa和（0.327±0.011）GPa。牙周炎组对应区段的牙骨质表面平均显微硬度均低于对照组,差异均有统计学意义（P〈0.05）。两组由冠至根向牙骨质表面显微硬度均呈现下降趋势。结论慢性牙周炎症可能会影响受累牙齿牙骨质的表面硬度。     

牙釉质表面经中性氟化钠处理后的扫描电镜观察和硬度改变

用扫描电镜和显微硬度计研究经中性氟化钠处理后釉质的表现和显微硬度,结果表明釉质表面有CaF_2颗粒沉积,其形成与氟浓度,处理时间,氟化纳剂型及釉质表面状况有关。氟化纳使经乳酸脱矿的釉质的硬度明显上升,再次脱矿后,其硬度虽有下降却无统计学意义。说明F~-不仅使Ca~(2+)、PO_4~(3-)等沉积于釉质表面使其再矿化,且能降低其溶解速度,在抑制釉质再脱矿方面发挥作用。     

不同氟浓度涂膜对牙釉质表面显微硬度的影响

作者观察应用含不同浓度氟化钠涂膜后牙釉质表面显微硬度值的改变情况。实验将釉质随机分为A、B、C三组。先测出实验之前的显微硬度值。然后在这三组釉质表面分别涂上0．5％、1．5％、2．7％的氟化钠涂膜24小时．再测显微硬度。结果；三组不同浓度氟化钠涂膜均使牙釉质显微硬度值有显著提高。与处理前比较，具高度显著性差异。A组含0.5%氟化钠涂膜其显微硬度值的增加率仅是其它两组的一半，而B、C两组高浓度氟化钠涂膜之间其硬度值的增加率又几乎相同。这表明，在达到一定的氟浓度后，其硬度值不再增加。作者认为，使用含1.5%氟化钠涂腹对预防龋齿较为理想。     

脉冲Nd:YAG激光结合氟化钠对人牙本质、牙骨质人工龋的影响

目的 :探讨脉冲Nd :YAG激光结合氟化钠对离体人牙牙本质、牙骨质人工龋的影响。方法 :将 2 0个健康离体人牙分别制成 2 0个牙本质和牙骨质标本。偏光显微镜观察激光加氟化钠组、激光组、氟化钠组和空白组 (不处理 )人工致龋实验后 ,牙本质、牙骨质标本纵面人工龋形态 ,并测量龋损深度。结果 :1)人工龋形态 :在牙本质和牙骨质标本中 ,激光加氟化钠组表层致密 ,脱矿区比空白组、激光组和氟化钠组浅。 2 )人工龋深度 :在牙本质和牙骨质标本中 ,激光加氟化钠组龋损深度不仅小于空白组 (P <0 .0 0 1) ,也小于激光组 [P <0 .0 0 1(牙本质 )、P <0 .0 1(牙骨质 ) ],氟化钠组〔P <0 .0 1(牙本质 )、P <0 .0 5 (牙骨质 )〕。结论 :脉冲Nd :YAG激光结合氟化钠能有效阻止离体人牙牙本质、牙骨质人工龋的形成和发展 ,促进早期龋再矿化 ,因而具有抗龋性能。     

洗必泰氟化钠涂料治疗老年人早期根面龋的临床应用

目的:观察表面活性剂洗必泰与氟化钠涂料防治老年人早期根面龋与单独使用氟化钠涂料防龋效果的比较.方法:选择临床60岁以上老年人早期根面龋患者98例共169颗患牙,分别应用洗必泰加氟化钠涂料(简称氟泰涂料)、氟化钠涂料涂布龋损区,3个月、6个月、12个月复查,比较其防龋效果.结果:3个月治疗效果,氟泰组与氟化钠组差异无显著性(P＞0.05),6个月、12个月疗效,氟泰组明显优于NaF组.12个月治愈率,氟泰涂料组为83.75%,氟化钠组为51.85%,统计学处理差异有显著性(P＜0.01).结论:氟泰涂料治疗早期根面龋操作简单,疗效肯定,抗龋效果时间长,是一种临床治疗早期根面龋的较好方法.     

含多肽因子牙膏对牙釉质抗酸蚀作用的体外研究

目的观察含多肽因子牙膏对牙釉质抗酸饮作用的效果。方法在体外pH循环环境中.用含多肽因子的牙膏处理28枚正常离体牙釉质片.通过显微硬度测定和偏光显微镜等.分析多肽因子牙膏对牙釉质的抗酸蚀作用效果。结果徐用多肽因子牙膏组的牙釉质硬度较对照组高（P＜0.0001）。偏光显微镜观察.其实验组总的脱矿程度小于对照组。结论含多肽因子牙膏对牙釉质具有一定的抗酸蚀作用。     

Effect of denture cleansers on surface hardness of resilient denture liners at various time intervals- an in vitro study

PURPOSE

This study was aimed to determine the effect of two chemically distinct denture cleansers and water on the surface hardness of acrylic and silicone based soft denture liners at various time intervals.

MATERIALS AND METHODS

Two commonly used commercial resilient liner material were selected based on their chemical composition (silicone- and acrylic-based soft liners) for this investigation. 120 cylindrical specimens were made of 15 mm × 10 mm dimensions (according to ASTM: D-2240-64T) in a custom made metal mold. All specimens were stored in artificial saliva throughout the study. Forty specimens were cleansed daily in 0.5% sodium hypochlorite solution; forty were cleansed in sodium perborate and remaining forty specimens were daily rinsed in water. Testing was done at 1 week, 1 month, 3 months and 6 months for surface hardness using a Shore A Durometer. A mean of 3 reading for each sample was subjected to one-way ANOVA, Post Hoc test and pair-t test for statistical analysis. P values of less than 0.05 were taken as statistically significant.

RESULTS

Surface hardness of all the samples was significantly higher after a period of 6 months irrespective of the cleansing treatment. Minor changes were observed between control, sodium hypochlorite and sodium perborate groups with time. Greater change was observed in surface hardness of acrylic-based soft denture liners as compared to silicone-based soft liners for all groups, as time progressed.

CONCLUSION

Silicone-based soft denture liners performed significantly better in all cleansing treatments than acrylic-based soft denture liners.     

氟化牛奶再矿化及抗龋作用的体内观察

目的：探索氟化牛奶在口腔局部的防龋作用机制。方法：利用口内装置,采用交叉对照的试验方法,观察氟化牛奶在口腔局部的再矿化作用和搞龋作用,结果：氟化牛奶有明显的再矿化作用,本试验条件下未观察到抗龋作用,结论氟化牛奶在口腔局部的作用机制主要是再矿化。     

The effects of the combination of chlorhexidine/thymol- and fluoride-containing varnishes on the severity of root caries lesions in frail institutionalised elderly people

Objectives. To compare the clinical effects of a fluoride-containing varnish (Fluor-Protector) in combination with a chlorhexidine-containing varnish (Cervitec) on existing root caries lesions in a group of frail elderly subjects.

Methods. A randomised double blind longitudinal study was utilised. Subjects (n=102) were randomly allocated to a Test or Placebo group. All leathery and soft root caries lesions in all subjects were coated with Fluor-Protector while the lesions in the Test group were also coated with Cervitec and the lesions in the Placebo group were coated with a Placebo varnish. Treatments were repeated five times in a 12-month period. Clinical parameters associated with root caries, measurements of individual lesions and salivary levels of caries associated bacteria were made at intervals.

Results. The clinical severity of the lesions in the Test group did not change significantly during the 12-month study period. In the Placebo group the mean lesion width and lesion height and length of exposed root increased significantly and the lesions were significantly closer to the gingival margin. There were no significant changes in the salivary levels of caries-associated microorganisms after 12 months although, in both groups, there was initially a significant reduction in the salivary levels of mutans streptococci.

Conclusions. The combination of Fluor-Protector and Cervitec is a useful, simple, quick and non-invasive method for the control and management of existing root caries lesions. The procedure could be performed by a dental hygienist and may be usefully applied in other high-risk groups including persons with Parkinson's disease, debilitating neuromuscular conditions and dry mouth from whatever cause.     

The effect of disinfectant solutions on the hardness of acrylic resin denture teeth

This investigation studied the effects of disinfectant solutions on the hardness of acrylic resin denture teeth. The occlusal surfaces of 64 resin denture teeth were ground flat with abrasives up to 400-grit silicon carbide paper. Measurements were made after polishing and after the specimens were stored in water at 37 degrees C for 48 h. The specimens were then divided into four groups and immersed in chemical disinfectants (4% chlorhexidine; 1% sodium hypochlorite and sodium perborate) for 10 min. The disinfection methods were performed twice to simulate clinical conditions and hardness measurements were made. Specimens tested as controls were immersed in water during the same disinfection time. Eight specimens were produced for each group. After desinfection procedures, testing of hardness was also performed after the samples were stored at 37 degrees C for 7, 30, 60, 90 and 120 days. Data were analysed using two-way analysis of variance (anova) and Tukey's test at 95% confidence level. According to the results, no significant differences were found between materials and immersion solutions (P > 0.05). However, a continuous decrease in hardness was noticed after ageing (P < 0.05). It was conclude that the surfaces of both acrylic resin denture teeth softened upon immersion in water regardless the disinfecting solution.