Said Fadi, Moskovitz Moti
J Clin Pediatr Dent. 2018;42(2):146-149. doi: 10.17796/1053-4628-42.2.11. Epub 2017 Oct 31.
The aim of the present study was to assess the effect of calcium hydroxide as a root canal dressing material on dentin microtensile fracture strength in human primary teeth in vitro.
Thirty primary anterior teeth with root canals packed with calcium hydroxide were divided into groups of ten and immersed in saline at room temperature for 7, 30 and 90 days. Ten teeth with root canals filled with sterile saline were the control group. Microtensile fracture strength was measured in Mechanical tester Lloyd testing machine.
There was a significant difference (P < 0.05) between the fracture strength of the calcium hydroxide-filled teeth after 90 days (19.1 MPa) compared with the control (35.8 MPa). Dentin microtensile fracture strength of the calcium hydroxide-filled teeth decreased at an average of 0.142 MPa per day.
Calcium hydroxide placed in root canals for an extended time had a significantly negative effect on root strength. Long-term success of root canal treatment in primary anterior teeth is estimated as 65% with most of the failures result from trauma recurrence.
Our results stress the need to evaluate the pros and cons of root canal treatment compared to extractions of non-vital primary incisors.
本研究旨在评估氢氧化钙作为根管充填材料对人乳前牙牙本质微拉伸断裂强度的体外影响。
将30颗根管内充填氢氧化钙的乳前牙分为每组10颗，在室温下于盐水中浸泡7天、30天和90天。10颗根管内充填无菌盐水的牙齿作为对照组。在Lloyd机械测试仪上测量微拉伸断裂强度。
90天后充填氢氧化钙的牙齿的断裂强度（19.1MPa）与对照组（35.8MPa）相比有显著差异（P<0.05）。充填氢氧化钙的牙齿的牙本质微拉伸断裂强度平均每天下降0.142MPa。
长时间置于根管内的氢氧化钙对牙根强度有显著负面影响。乳前牙根管治疗的长期成功率估计为65%，大多数失败是由于创伤复发。
我们的结果强调了与拔除无活力的乳切牙相比，评估根管治疗利弊的必要性。
