Suresh Nandini, Chandrasekaran Sooriaprakas, Ashritha M C V, Raoufe Mohammed Abdul, Vasudevan Aishwarya, Natanasabapathy Velmurugan
Department of Conservative Dentistry and Endodontics, Faculty of Dentistry, Meenakshi Ammal Dental College and Hospital, Meenakshi Academy of Higher Education and Research, Chennai, Tamil Nadu, India.
Dent Res J (Isfahan). 2023 Jul 25;20:84. eCollection 2023.
This study evaluated the interface between fresh eugenol/bioceramic sealer-conditioned coronal dentin and high-viscous glass-ionomer cement (HVGIC), treated with various dentin conditioners (saline, 10% polyacrylic acid, and 37% phosphoric acid).
Standard endodontic access preparation and instrumentation were done in 21 freshly extracted mandibular molar teeth in this study. Teeth were divided into two interventional groups ( = 9/group), based on the type of sealer (zinc oxide eugenol [ZOE]/bioceramic [BioRoot RCS] sealer) used for obturation. Samples were further subdivided based on the type of dentin-conditioning procedures performed (saline/10% polyacrylic acid/37% phosphoric acid). Post dentin conditioning, the access cavity was sealed with HVGIC. Later, material-dentin interfacial analysis and elemental analysis were done using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy.
The interfacial SEM images of HVGIC layered over B-RCS/ZOE sealer-conditioned dentin, treated with saline, showed predominantly adhesive debonding failures, whereas cohesive debonding was observed with polyacrylic and phosphoric acid. In the elemental analysis, the intensity of zirconium (depicting the residue of B-RCS)/zinc (depicting ZOE sealer) was very high on the dentin side treated with saline, in comparison to the dentin treated with polyacrylic and phosphoric acid. Furthermore, the intensity of elements from HVGIC was low on the dentin side of the groups with saline, whereas these elements showed maximum penetration into the dentin when treated with phosphoric acid.
Conditioning of the endodontic access cavity using 37% phosphoric acid immediately postobturation resulted in higher penetration of HVGIC into the dentin, in comparison to the other dentin conditioners.
本研究评估了用不同牙本质调节剂（生理盐水、10%聚丙烯酸和37%磷酸）处理后的新鲜丁香酚/生物陶瓷封闭剂预处理的冠部牙本质与高粘性玻璃离子水门汀（HVGIC）之间的界面。
本研究对21颗新鲜拔除的下颌磨牙进行标准的根管治疗开髓预备和器械操作。根据用于根管充填的封闭剂类型（氧化锌丁香酚[ZOE]/生物陶瓷[BioRoot RCS]封闭剂），将牙齿分为两个干预组（每组 = 9颗）。样本再根据所进行的牙本质调节程序类型（生理盐水/10%聚丙烯酸/37%磷酸）进一步细分。牙本质调节后，用HVGIC封闭开髓腔。随后，使用扫描电子显微镜（SEM）和能量色散X射线光谱进行材料-牙本质界面分析和元素分析。
在经生理盐水处理的用B-RCS/ZOE封闭剂预处理的牙本质上覆盖HVGIC的界面SEM图像显示，主要为粘结性脱粘失败，而用聚丙烯酸和磷酸处理时观察到内聚性脱粘。在元素分析中，与用聚丙烯酸和磷酸处理的牙本质相比，在用生理盐水处理的牙本质一侧，锆（代表B-RCS的残留物）/锌（代表ZOE封闭剂）的强度非常高。此外，在生理盐水处理组的牙本质一侧，来自HVGIC的元素强度较低，而在用磷酸处理时，这些元素显示出最大程度地渗入牙本质。
与其他牙本质调节剂相比，根管充填后立即用37%磷酸处理根管开髓腔可使HVGIC更高程度地渗入牙本质。
