Objectives

Dentine replacement materials are often placed over caries affected dentine (CAD). The aim of this study was to compare the bonding characteristics and interactions of selected hydraulic calcium silicate-based dentine replacement materials to CAD and sound dentine.

Methods

Three hydraulic calcium silicate-based dentine replacement materials were assessed: Retro MTA, Biodentine and Theracal LC. Material characterization was done by scanning electron microscopy and X-ray diffraction analyses. Blocks of sound and CAD were prepared and standardized by Vickers microhardness testing. Half of the affected and sound dentine blocks were pretreated with 5.25% NaOCl prior to material placement. The materials were stored either for 1 week or 24 weeks in 37 °C in fully saturated conditions. Shear bond strength was assessed at both time periods. Radiopacity of the interfacial dentine was also evaluated to assess the remineralization potential of the dentine replacement materials.

Results

The reaction of Theracal was slower than that of the water-based materials. The bond strengths of different materials did not differ after 1 week (P > 0.05). The bond strength of Biodentine and Retro MTA increased over time but no change was observed for Theracal. NaOCl pre-treatment deteriorated the bond strength to sound dentine but improvement was observed in affected dentine. Radiopacity changes were observed after 24 weeks.

Significance

Biodentine and Retro MTA showed better bonding to CAD. Pretreatment with NaOCl improved the bond strength of dentine replacement materials to CAD.

中文翻译：

---

结合龋齿受影响的牙本质

目标

牙本质替代材料通常放置在龋齿影响的牙本质（CAD）上。这项研究的目的是比较选定的基于水硅酸钙的牙本质替代材料与CAD和健全牙本质的粘合特性和相互作用。

方法

评估了三种基于水硅酸钙的牙本质替代材料：Retro MTA，Biodentine和Theracal LC。通过扫描电子显微镜和X射线衍射分析完成材料表征。声音和CAD块已通过维氏显微硬度测试制备并标准化。在放置材料之前，用5.25％NaOCl预处理一半的患牙和完好的牙本质块。将该材料在完全饱和的条件下于37°C储存1周或24周。在两个时间段均评估了剪切粘结强度。还评估了界面牙本质的射线不透性，以评估牙本质替代材料的再矿化潜力。

结果

Theracal的反应比水基材料的反应慢。1周后，不同材料的粘结强度没有变化（P> 0.05）。Biodentine和Retro MTA的结合强度随时间增加，但Theracal没有观察到变化。NaOCl预处理会使与健全的牙本质的粘合强度下降，但在受影响的牙本质中观察到了改善。24周后观察到射线不透性变化。

意义

Biodentine和Retro MTA与CAD的粘合性更好。用NaOCl预处理可提高牙本质替代材料与CAD的结合强度。