The objectives of this study were to evaluate how different disinfection protocols affect the surface roughness of gutta-percha (GP) cones used for the dental root canal filling using DIN 4768 standard and another alternative process for assessing roughness of small surface area (multiple profile), comparing both methods in order to identify similarities. The GP cones used were the conventional (C) and a new one impregnated with zirconia oxide, known as the coated cone (CC). Samples were distributed for each group and they were immersed in the correspondent chemical solution as follows: Group 1 (G1), sodium hypochlorite (NaOCl) at 5.25% for 1min; Group 2 (G2), sodium hypochlorite at 2.5% for 10min; and Group 3 (G3), chlorhexidine gluconate (CHX) at 2% for 5min, as recommended by dentistry protocols. The averages and standard deviations of the surface roughness parameters—average roughness (Ra) and root mean square deviation roughness (Rq)—were calculated. Statistical analysis was made before and after immersion by pairedt-test. Results showed a statistically significant difference for C GP cones after immersion in 2% CHX and 2.5% NaOCl (p<0.01). No difference was found in CC GP cones. DIN 4768 standard and multiple profile measurements showed similar trends and behavior.
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机译：本研究的目的是评估不同的消毒方案如何影响用于使用DIN 4768标准的牙科根管填充的牙齿根部管道（GP）锥体的表面粗糙度和用于评估小表面积粗糙度的另一种替代方法（多种轮廓） ，比较两种方法以识别相似性。使用的GP锥体是常规（c）和浸渍氧化锆氧化物的新型，称为涂覆的锥体（Cc）。将样品分布在每组中，将它们浸入对应的化学溶液中，如下：1（G1），次氯酸钠（NaOCl）为5.25％，持续1min;第2组（G2），次氯酸钠为2.5％，10分钟;和第3组（G3），葡萄糖醇（CHX），5分钟的葡萄糖酸盐（CHX），如牙科协议的推荐。表面粗糙度参数的平均值和标准偏差 - 平均粗糙度（Ra）和均方根偏差粗糙度（RQ） - 计算。在浸没通过配对测试之前和之后进行统计分析。结果表明，在浸入2％CHX和2.5％NoOCL（P <0.01）后，C GP锥体对C GP锥体具有统计学意义。 CC GP锥体中没有发现差异。 DIN 4768标准和多种轮廓测量显示出类似的趋势和行为。
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