简介：一个近似方法被建立了计算沿着一张化学契约的在僵绳点的在一个分子的在一个电子上的潜在的行动的深度，由Dpb表示了。是新指示物能被用于预言一张化学契约的力量。在这个工作，作为为表明这个方法的实际应用，我们用方法沿着所有CH和NH化学药品契约计算了deoxyribonucleosides和ribonucleosides的Dpb。结果在对那些结果的公平同意以前报导了试验性、理论的观察。

简介：Thepurposeofthisstudywastoevaluatethelongtimeantibacterialpropertiesandshearbondstrengthofexperimentalnanosilver-containingcements(NSC).Nanosilverbaseinorganicantibacterialpowderwasaddedtothereinforcedglassionomercementatfivedifferentweightratiostoobtainaseriesofnanosilver-containingcements,thentheantibacterialpropertiesofthreeorthodonticcementproductsandfiveNSCsampleswereevaluatedbythedirectcontacttest(DCT)andtheagardiffusiontest(ADT).TheDCT,whichwasbasedonturbidnessdeterminationofbacterialgrowthin96-wellmicrotiterplates,wasperformedinbothfreshandagedfor1day,1week,2weeks,3weeks,4weeks,6weeks,and8weekstestedmaterials.TheshearbondstrengthesofthreeorthodonticcementproductsandfiveNSCsampleswereexaminedusingauniversaltestingmachine.TheADTresultsindicatedthattherewerenosignificantdifferencesbetweenNSCsandORTHOLCfreshspecimens.IntheDCTexperiment,allfreshsilvernanoparticles-containingtestedsamplespresentedpowerfulantibacterialproperties,buttheygraduallylosttheeffectiveantimicrobialagentswiththeextensionofagingtime.Finally,noneofthetestedmaterialsmaintaineditsantibacterialpropertyafteragingfor8weeks.Agraduallydecreasingtrendofbondstrengthpresentedwiththeincreasingincorporationofnanosilverbaseinorganicantibacterialpowderintotheglassionomercement,eventhoughallthetestedmaterialspecimensreachedtheidealbondstrengthrange.WemayconcludethatNSCscancontributetodecreasethedemineralizationratearoundbracketswithoutcompromisingbondstrength.

简介：龋病是口腔疾病中的常见病、多发病,对牙齿的危害较大.如果能有效地预防和控制窝沟龋的发生,就能有效减少龋坏的发生.窝沟封闭术是临床上最常用的有效预防窝沟龋的办法之一.窝沟封闭术是使用窝沟封闭剂严密封闭牙冠表面的窝沟,防止链球菌对窝沟的侵害,从而有效地保护牙釉质,达到预防龋病的目的.而窝沟封闭剂的防龋效果主要取决于封闭剂的保留率,所以如何选择粘结剂增加封闭剂的保留率至关重要.本实验就是观察研究Prime＆BondNT粘接剂对封闭剂保留率的影响.