各种修复技术对活髓切断术治疗的恒前磨牙抗折性能的影响。

The Effects of Various Restorative Techniques on the Fracture Resistance of Pulpotomized Permanent Premolars.

作者信息

Ghahramani Yasamin, Shafiei Fereshteh, Jowkar Zahra, Kazemian Sepideh

机构信息

Department of Endodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.

Oral and Dental Disease Research Center, Department of Operative Dentistry, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.

出版信息

Int J Dent. 2021 May 8;2021:5590911. doi: 10.1155/2021/5590911. eCollection 2021.

DOI:10.1155/2021/5590911

PMID:34046063

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8128608/

Abstract

AIM

This study aimed to evaluate the effects of various restorative techniques on the fracture resistance of pulpotomized premolars with mesioocclusodistal (MOD) cavities treated with mineral trioxide aggregate (MTA) or calcium enriched mixture (CEM) cement.

MATERIALS AND METHODS

One hundred and eight sound extracted maxillary premolars were randomly assigned to nine experimental groups ( = 12). The teeth in group 1 did not receive any preparation. Class II MOD cavities were prepared in the other experimental groups. In groups 2, 4, 6, and 8, tooth-colored MTA was used for pulpotomy. In groups 3, 5, 7, and 9, CEM cement was used for pulpotomy. Groups 2 and 3 were left unrestored. Groups 4 and 5 were restored with amalgam. Groups 6 and 7 were restored with a conventional composite resin, and groups 8 and 9 were restored with bulk-fill giomers. Fracture resistance was measured, the fracture pattern of each specimen was assessed, and the results were statistically analyzed.

RESULTS

The fracture resistance of group 1 was significantly higher than those of the other groups ( < 0.05). The fracture resistance of group 2 (MTA + amalgam) was statistically lower than those of all experimental groups ( values < 0.05) except groups 3, 4, and 5 ( values > 0.05). No statistically significant differences were found between the groups restored with amalgam, conventional composite resin, and bulk-fill giomer (groups 4, 5, 6, 7, 8, and 9) ( values < 0.05). The highest rate of mode 1 fracture (restorable fracture) was observed in group 1 followed by groups 8 and 9.

CONCLUSION

No significant differences were found among the fracture resistances of the restored teeth using various restorative techniques. Bulk-fill giomers followed by conventional composite resin were better able to prevent unfavorable fractures compared to amalgam. Therefore, they seem to be more reliable for the restoration of pulpotomized teeth with MOD cavities.

摘要

目的

本研究旨在评估各种修复技术对用三氧化矿物凝聚体（MTA）或富钙混合物（CEM）粘结剂治疗的近中咬合远中（MOD）洞型活髓切断术的前磨牙抗折性能的影响。

材料与方法

108颗完好的拔除上颌前磨牙随机分为9个实验组（每组12颗）。第1组牙齿未做任何预备。其他实验组制备Ⅱ类MOD洞型。在第2、4、6和8组中，使用牙色MTA进行活髓切断术。在第3、5、7和9组中，使用CEM粘结剂进行活髓切断术。第2组和第3组未进行修复。第4组和第5组用银汞合金修复。第6组和第7组用传统复合树脂修复，第8组和第9组用大块充填聚酸改性复合树脂修复。测量抗折性能，评估每个标本的骨折模式，并对结果进行统计分析。

结果

第1组的抗折性能显著高于其他组（P<0.05）。第2组（MTA+银汞合金）的抗折性能在统计学上低于除第3、4和5组外的所有实验组（P值<0.05）（第3、4和5组P值>0.05）。用银汞合金、传统复合树脂和大块充填聚酸改性复合树脂修复的组（第4、5、6、7、8和9组）之间未发现统计学上的显著差异（P值<0.05）。在第1组中观察到最高的模式1骨折（可修复骨折）发生率，其次是第8组和第9组。