Sahu Shailendra Kuamar, Nagda Suhasini J
Department of Prosthodontics, Nair Hospital Dental College, Mumbai, Maharashtra, India.
Int J Appl Basic Med Res. 2021 Jul-Sep;11(3):143-147. doi: 10.4103/ijabmr.IJABMR_324_20. Epub 2021 Jul 19.
Cordless gingival retraction materials are now routinely used method for gingival retraction. Although evidence-based information is available on the effect of gingival displacement cord and cordless system on the effectiveness of displacement and the periodontal health, there is a lack of literature regarding the effect of cordless retraction agents on enamel and dentin substrates.
The purpose of this investigation was to analyze the changes on the smear layer induced by the hemostatic agent and cordless retraction material at scanning electron microscopic level.
Ferric sulfate (15.5% m/v), expasyl, and magic foam cord were evaluated. Buccal surfaces of 16 recently extracted mandibular premolars were prepared for metal-ceramic crowns, and four teeth each were exposed to ferric sulfate solution, expasyl, and magic foam cord, respectively, for 5 min. Teeth in the control group were exposed to distilled water. The assessment of changes was performed using a scanning electron microscope (SEM).
SEM exhibited smear layer covering the dentin and occluding the dentinal tubules in the control group. Exposure to ferric sulfate caused the opening of few of the dentinal tubules whereas expasyl caused the partial removal of smear layer with dentinal plugs partially occluding the openings of most of the dentinal tubules. The specimens treated with magic foam exhibited a smear layer similar to the control group.
The smear layer was affected most with ferric sulfate solution, followed by expasyl and magic foam cord. Magic foam cord did not affect the smear layer.
无绳牙龈退缩材料现已成为牙龈退缩的常用方法。尽管有基于证据的信息表明牙龈移位线和无绳系统对移位效果和牙周健康的影响，但关于无绳退缩剂对牙釉质和牙本质基质影响的文献却很缺乏。
本研究的目的是在扫描电子显微镜水平分析止血剂和无绳退缩材料对玷污层的影响。
评估了硫酸铁（15.5% m/v）、Expasyl和神奇泡沫线。对16颗近期拔除的下颌前磨牙的颊面进行金属烤瓷冠修复准备，每组四颗牙齿分别暴露于硫酸铁溶液、Expasyl和神奇泡沫线中5分钟。对照组牙齿暴露于蒸馏水中。使用扫描电子显微镜（SEM）进行变化评估。
SEM显示对照组中玷污层覆盖牙本质并封闭牙本质小管。暴露于硫酸铁导致少数牙本质小管开放，而Expasyl导致玷污层部分去除，牙本质栓部分封闭大多数牙本质小管开口。用神奇泡沫处理的标本显示出与对照组相似的玷污层。
玷污层受硫酸铁溶液影响最大，其次是Expasyl和神奇泡沫线。神奇泡沫线不影响玷污层。
