Sheykhrezae Mohammad S, Meraji Naghmeh, Ghanbari Fatemeh, Nekoofar Mohammad H, Bolhari Behnam, Dummer Paul M H
Department of Endodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
General Dentist, Private practice, Tehran, Iran.
Aust Endod J. 2018 Dec;44(3):255-259. doi: 10.1111/aej.12227. Epub 2017 Sep 3.
The aim of this study was to investigate the effect of human blood exposure on the compressive strength of various calcium silicate-based cements. Two hundred and eighty-eight customised cylindrical moulds were randomly divided into three groups according to material used: ProRoot MTA, Biodentine or CEM cement (n = 96). Each group was divided into two subgroups according to exposure conditions: PBS or blood. Then, the compressive strength of the specimens was measured after 6 h, 24 h, 72 h and 7 days. The compressive strength of CEM cement could not be measured after 6 and 24 h regardless of the exposure conditions nor could the compressive strength of 6 h blood-exposed ProRoot MTA. The compressive strength of blood-exposed ProRoot MTA was only significantly lower after 6 h, but no difference was seen at other time intervals. Blood exposed did adversely affected the compressive strength of Biodentine. The compressive strength of all groups significantly increased over time (P < 0.005).
本研究的目的是调查人体血液暴露对各种硅酸钙基水门汀抗压强度的影响。根据所用材料，将288个定制圆柱形模具随机分为三组：ProRoot MTA、Biodentine或CEM水门汀（n = 96）。根据暴露条件，每组再分为两个亚组：磷酸盐缓冲盐水（PBS）或血液。然后，在6小时、24小时、72小时和7天后测量样本的抗压强度。无论暴露条件如何，CEM水门汀在6小时和24小时后均无法测量其抗压强度，6小时血液暴露的ProRoot MTA也无法测量其抗压强度。血液暴露的ProRoot MTA仅在6小时后抗压强度显著降低，但在其他时间间隔未见差异。血液暴露确实会对Biodentine的抗压强度产生不利影响。所有组的抗压强度均随时间显著增加（P < 0.005）。
