Biofilm composition and secondary caries in situ and in vivo

描述(申请人提供)：继发性或复发性龋病被认为是在修复体附近形成的一种龋损。龋病的基本病因被认为存在于菌斑生物膜中。这种生物膜，由于经常摄入可发酵的碳水化合物，从与牙齿组织的平衡状态变化到脱矿促进状态。虽然复发性龋病的基本病因与原发龋病没有什么不同，但有几个因素使复发性龋病变得特殊。在该过程的部位处非生物材料的存在可能以几种方式影响该过程：1)材料和牙齿之间的界面/间隙可能产生新的生物膜部位和/或改变扩散行为；2)诸如缺乏缓冲能力的材料特性可能影响生物膜和/或化学过程的发展和组成。在这个项目中，我们主要关注生物膜与体内和原位复发龋损发展的关系。关于生物膜，我们最感兴趣的特征是它的组成和产酸。将使用传统的培养方法和最现代的基于DNA的分子微生物学技术：焦磷酸测序来研究生物膜的组成。体内研究将使我们能够看到原发和继发性病变生物膜之间的差异，对于最常见的修复材料复合材料和银汞合金。两项现场研究将使我们能够评估修复材料特性对生物膜组成和功能以及病变发展的影响。此外，还可以根据生物膜的组成和功能以及病变的发展来评估复合修复体和牙齿之间的间隙的作用。含有抗细菌和/或防龋齿成分的材料将被纳入研究范围。通过这种方式，我们希望阐明材料特性和修复界面条件在复发性龋病中的作用，有望为提高复合修复性能指明方向。

DESCRIPTION (provided by applicant): Secondary or recurrent caries is considered to be a caries lesion developing adjacent to a restoration. The basic etiology of caries is recognized to lie within the plaque biofilm. This biofilm, due to the frequent ingestion of fermentable carbohydrates, changes from a state of equilibrium with the tooth tissue to a demineralization promoting state. Although the basic etiology of recurrent caries is no different from that of primary caries, there are several factors that make recurrent caries special. The presence of a non-biological material at the site of the process may influence this process in several ways: 1) the interface / gap between the material and the tooth may create a new biofilm site and/or change the diffusion behavior; 2) the material properties, such as a lack in buffering capacity, may influence the development and composition of the biofilm and/or the chemical process. In this project we focus on the biofilm in relation to recurrent caries lesion development both in vivo and in situ. The characteristics we are most interested in regarding the biofilm are its composition and acid production. Biofilm composition will be studied both using traditional culturing methods, and using the most modern DNA-based molecular microbiology technique: pyrosequencing. The in vivo study will allow us to look at differences between primary and secondary lesion biofilm, for the most common restorative materials composite and amalgam. Two in situ studies will allow us to evaluate the effect of restorative material properties on biofilm composition and function and lesion development. Also, the role of gaps between composite restoration and tooth can be evaluated, again with respect to both biofilm composition and function and lesion development. Materials with anti-bacterial and/or anti- caries components will be included in the studies. In this way we hope to elucidate the role of material properties and restoration interface conditions on recurrent caries, hopefully pointing the way towards improving composite restoration performance.