Adl Alireza, Sobhnamayan Fereshte, Kazemi Omid
Department of Endodontics and Biomaterials Research Center, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
Dentist, Student Research Committee, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
Dent Res J (Isfahan). 2014 Sep;11(5):564-7.
The purpose of this study was to compare the push-out bond strength of mineral trioxide aggregate (MTA) and calcium enriched mixture (CEM) as root end filling materials.
A total of 40 root dentin slices (1 ± 0.2 mm) were prepared from freshly extracted human maxillary central teeth and their lumens were enlarged to 1.3 mm. The slices were randomly divided into two groups (n = 20). MTA and CEM cement were mixed according to manufacturer's instruction and introduced into the lumens. The specimens were wrapped in pieces of wet gauze soaked in distilled water and incubated at 37°C for 3 days. The push-out bond strength was measured using a universal testing machine. The slices were then examined under a light microscope at ×10 magnification to determine the nature of bond failure. The data were analyzed using Mann-Whitney test (P < 0.001).
The mean push-out bond strength for CEM cement and MTA were 1.68 ± 0.9 and 5.94 ± 3.99 respectively. The difference was statistically significant (P < 0.001). The bond failure was predominantly of adhesive type in MTA group and cohesive type in CEM group.
CEM cement showed significantly lower bond strength to the dentinal wall compared to MTA.
本研究的目的是比较作为根尖充填材料的三氧化矿物凝聚体（MTA）和富钙混合物（CEM）的推出粘结强度。
从新鲜拔除的人上颌中切牙制备40个牙根牙本质切片（1±0.2毫米），并将其管腔扩大至1.3毫米。将切片随机分为两组（n = 20）。按照制造商的说明混合MTA和CEM水门汀，并将其引入管腔。将标本用浸泡在蒸馏水中的湿纱布包裹，并在37°C下孵育3天。使用万能试验机测量推出粘结强度。然后在光学显微镜下以×10放大倍数检查切片，以确定粘结失败的性质。使用曼-惠特尼检验分析数据（P < 0.001）。
CEM水门汀和MTA的平均推出粘结强度分别为1.68±0.9和5.94±3.99。差异具有统计学意义（P < 0.001）。MTA组的粘结失败主要为粘结型，CEM组为内聚型。
与MTA相比，CEM水门汀对牙本质壁的粘结强度明显较低。
