树脂—牙本质作用机理与粘接强度影响因素的研究
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  • 英文题名:Investigation of Mechanism and Affecting Factors for Bond Strength between Resin and Dentin
  • 作者:郭良微
  • 论文级别:博士
  • 学科专业名称:口腔临床医学
  • 学位年度:2006
  • 导师:孙宏晨 ; 徐经伟
  • 学科代码:100302
  • 学位授予单位:吉林大学
  • 论文提交日期:2006-06-11
摘要
对牙硬组织的粘接包括对牙釉质和牙本质的粘接。粘接剂能够与牙釉质的羟基磷灰石形成坚固的微机械粘接;在牙本质粘接中,粘接力主要是由混合层和树脂突形成的机械固位,同时存在一定的化学作用。牙本质由于存在成牙本质细胞突起和牙本质小管等结构,易受到各种因素的影响而不易获得成功的粘接。本研究从以下方面对树脂-牙本质界面性能与结构进行表征:首次运用FT-Raman光谱技术,对粘接剂与牙本质的化学作用进行研究,证实它们之间存在氢键的作用。通过力学性能的测试,证实在短期内热循环对牙本质粘接强度无显著影响,同一颗牙的咬合面和邻面其牙本质的粘接强度无显著差异。率先对氟牙症牙本质粘接进行力学性能测试和CLSM观察,结果表明氟牙症的粘接强度显著低于正常牙;微形态学表现为,Single Bond2与氟牙症所形成的混合层和树脂突与正常牙相比存在一定的差异,讨论了粘接强度影响因素,阐述了粘接树脂-牙本质作用机理,为临床修复治疗提供一定的理论基础。
Adhesion to dental hard tissues is included to bonding to both enamel anddentin .Enamel is composed of 96% hydroxyapatite. Following acid etchingenamel, strong micromachanical bond can be achieved between adhesive resinand enamel. The dentin substrate is physiologically and morphologicallydifferent from enamel. Dentin contains 60% organic components and water,40% mineral components, and fluid liquid in dentin tubule. All these factorsmay compromise bond strength between resin adhesive and dentin, result inrestoration falling off and failure of therapy in clinical practice.
    The properties of resin-dentin interface are affected by many factors, suchas the structure and surface properties of dentin, treatment methods, choices ofadhesive, and environment of oral. This research is focus on four fields relatedclosely with clinical situation, and some uncertain and controversial argumentsalso exist in these fields. These investigations are: FT-Raman spectroscopicstudy of interaction between adhesive and dentin;effects of thermal cycles anddifferent locations on shear bonding strength;under the same treatment withdentin investigation the difference of microstructure and shear bondingstrength between sound dentin and dental fluorosis dentin using confocal laser
    scanning microscope. The purpose of this investigation is further to exploremechanism and affecting factors for interaction between resin and dentin.Interaction mechanism between resin and dentin is generally explained bymechanical theory or mechanical-chemical theory. The former consider thatbonding force comes from mechanical retention of resin with dentin. Themechanical-chemical theory thinks except the existence of mechanicalretention, chemical interaction between resin and dentin may also occur.Five adhesives in two bonding systems are applied on the dental surface.The disks absorbed adhesive are washed with solvent to remove extra adhesivefrom the surface. As a surface scattering technique, FT-Raman could detectsurface situation of samples without modification, so FT-Raman spectra wererecorded at each step to study the interaction between resin and dentin. It wasobserved that carbonyl stretching mode of HEMA was moved to 24cm-1 lower,considering effects of polymerization, actual shift of carbonyl was 26-34cm-1,which indicates that hydrogen bonding exist between adhesive and dentin.This conclusion supports that except the existence of mechanical retention,chemical interaction between resin and dentin may also occur.Temperature in oral often changes. Because of the different thermalexpansion coefficients between dental bonding agents and dental hard tissues,change of temperature will result in stress on the interface of resin and dentin.Thermal cycling machine is used to stimulate oral temperature change in vitro.In this paper, times of cycle is set no more than 1000. Two adhesives areapplied. Following shear bond test, the fracture surface of specimen is viewedusing scanning electron microscope to investigate the affecting factors ofthermal cycles on shear bond strength in short term . Applying Single Bond orAdper Prompt, no statistically significant differences were found in shearbonding strength based on different thermal cycles. Shear bond strength of
    each thermal treatment is significantly lower in Adper Prompt groups than inSingle Bond groups. Scanning electron microscope revealed that the quantitiesof resin tags are less in Adper Prompt groups than these in Single Bond groups.Gaps can be found between dentin tubule and resin tags in Adper Promptgroups. Resin tags are located in superfacial region of composite resin.Occlusal surface is the highest incidence of restoration and the less isproximal surface. And the restoration durability on occlusal surface aredifferent from restoration on proximal surface. Occlusal force imposingthroughout dentin is changed with the location of dentin. Structuralcomponents of dentin are not homology in different locations. The structure ofdentin is tubule, intertubular dentin, peritubular dentin. Fluid liquid within thetubule and odontoblastic are structural components of dentin tubule .Thesestructure of dentin directly affect bond strength. Studies confirmed that dentinwith tubules running parallel to dental surface has more amount of peritubulardentin than that in dentin with tubules running perpendicular, which will resultin a lesser area of intertubular dentin to form hybrid layer and a lower bondingstrength. To evaluate bonding strength of occlusal and proximal surface in thesame tooth, shear bond test is carried out. Morphology of resin-dentininterface was observed with scanning electron microscope. Shear bondstrength are no statistically significant difference between occlusal surface andproximal surface. Thickness of hybrid layer and resin tags in two locations ofdentin is homology. No statistically significant differences were observedbetween applying Primer & Bond and applying Xenon Ⅲ . Significantdifference of hybrid layer and morphology of resin tags was observed betweenPrimer & Bond and XenonⅢ. Thickness of hybrid layer was thinner andlength of resin tags was shorter in Primer & Bond. The results shown that the
    thickness of hybrid layer and morphology of resin tags are not basic factorsaffect bond strength, may be other mechanism. There are few reports on theinfluence of different location. This research compared bonding strength onocclusal surface with that on proximal surface while the microstructure onboth surfaces was observed by scanning electron microscope. Experimentalresults shown that there was no significant difference of bonding strengths onocclusal and proximal surface even some difference in hybrid layers and tagswere observed by scanning electron microscope on both surface. Thisexperimental result is consisted with conclusion that emphasizes that qualityof hybrid layer is a key factor for bonding strength.Researches so far have been carried out on sound dentin. However, fewstudies have been conducted to focus on dental fluorosis to gain a betterunderstanding of bonding to dental fluorosis dentin. Chronic fluoride ingestionon formation and mineralization stage, of which tooth formation andmineralization results in dysphasic enamel and abnormal mineralization.Lesion involves in both enamel and dentin with hypo calcified and hyperactivecalcified. Studies for aesthetic restoration to dental fluorosis were carried outon bonding to enamel instead of dentin. Micro tensile test and shear bondingtest was carried out on moderate dental fluorosis dentin, which is classified byDean's Index of Fluorosis, from same region with normal dentin as control.Two different adhesives were used. Microstructure of dental fluorosis wasobserved by confocal laser scanning microscope. And applying Single Bond2or XenoⅢ, experimental results shown that shear bond and microtensilestrength of dental fluorosis dentin were significantly lower than these ofnormal tooth. No statistically significant differences were found in eachadhesive group which bond to normal dentin or dental fluorosis dentin.The effects of thermal cycles and different locations of dentin on shear
    bonding strength were investigate, then scanning electron microscope is usedto analyze the affecting factors in this study. FT-Raman was firstly introducedto study mechanism of five adhesive systems bonding to dentin. Thenmicrostructure and shear bonding strength of dental fluorosis dentin werestudied. All these results could be a theory reference in clinical performance.
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