Fuss Z, Charniaque O, Pilo R, Weiss E
Department of Endodontology, Maurice and Gabriela Goldschleger, School of Dental Medicine, Tel Aviv University, Tel Aviv 69978, Israel.
J Endod. 2000 Sep;26(9):519-22. doi: 10.1097/00004770-200009000-00008.
Most chemically cured two-component dental materials, including endodontic sealers, are marketed with mixing instructions but with no strict mixing ratios. The present study evaluated the antibacterial properties and hardness of three endodontic sealers: Roth's cement (RC), CRCS, and AH26, mixed to four controlled consistencies within the range of the manufacturer recommendations. Using Enterococcus faecalis as the test microorganism, antibacterial activity was evaluated by agar diffusion and direct contact test. Surface hardness of sealers with the same consistency was evaluated on week-old specimens by the Knoop Hardness Number tester. In the agar diffusion test, light consistency of RC showed larger zones of inhibition than heavier consistency, whereas no significant differences were found with AH26 or CRCS. In the direct contact test, RC and CRCS exhibited complete inhibition of bacterial growth at all consistencies, whereas AH26 with the heavier consistencies did not inhibit bacterial growth at 24 h samples. The hardness of AH26 and CRCS was significantly lower with lighter consistencies. It is concluded that endodontic sealers possess different antibacterial and physical properties according to their mixing consistencies.
大多数化学固化的双组分牙科材料，包括牙髓封闭剂，在销售时都附有混合说明，但没有严格的混合比例。本研究评估了三种牙髓封闭剂：罗斯水泥（RC）、CRCS和AH26，在制造商建议的范围内混合至四种可控稠度后的抗菌性能和硬度。以粪肠球菌作为测试微生物，通过琼脂扩散法和直接接触试验评估抗菌活性。使用努氏硬度计在一周龄的样本上评估相同稠度封闭剂的表面硬度。在琼脂扩散试验中，RC的轻度稠度显示出比重度稠度更大的抑菌圈，而AH26或CRCS则未发现显著差异。在直接接触试验中，RC和CRCS在所有稠度下均表现出对细菌生长的完全抑制，而AH26在重度稠度下在24小时样本中未抑制细菌生长。AH26和CRCS的轻度稠度硬度显著较低。得出的结论是，牙髓封闭剂根据其混合稠度具有不同的抗菌和物理性能。
