Bühler Julia, Schmidli Fredy, Weiger Roland, Walter Clemens
Department of Periodontology, Endodontology and Cariology, University of Basel, Hebelstrasse 3, 4056, Basel, Switzerland.
Clin Oral Investig. 2015 May;19(4):877-85. doi: 10.1007/s00784-014-1317-z. Epub 2014 Sep 21.
The aim of this study was an analysis of the root surface roughness caused by air polishing powders containing sodium bicarbonate or glycine.
The roots of human molars were sectioned into dentin discs and irradiated with three different powders: (A) sodium bicarbonate (dv50 = 62 μm), (B) glycine (dv50 = 49 μm) and (C) glycine (dv50 = 21 μm). Standardized conditions in terms of instrumentation time (5 and 10 s), pressure (1.8 bar), distance (2 and 5 mm) and angulation (45° and 90°) were applied. Surface roughness (DIN EN ISO 4287:1998) of the probes was analysed by means of the surface profile values "Pa" and "Pt" and the surface roughness value "Rz". The effect of treatment (treated vs. untreated) was studied on each disc. Geometric mean ratios (GMRs) from mixed effects models and confidence intervals (95% CI) were calculated.
For Pa, the comparison revealed significant differences between powders A and B (GMR 3.57, 95 % CI 2.87-4.43, p < 0.001) and powders A and C (GMR 2.72, 95% CI 2.20-3.37, p < 0.001) for the overall effects. With respect to Pt, significant differences occurred between powders A and B (GMR 2.49, 95% CI 2.11-2.94, p < 0.001) and powders A and C (GMR 2.39, 95% CI 2.03-2.82, p < 0.001). Between powders B and C, there were no significant differences for Pa, Rz and Pt.
Air polishing powders containing glycine caused significantly less alterations on human root surfaces compared to powders containing sodium bicarbonate.
Powders containing glycine caused a significantly lower increase in root surface roughness compared to those containing sodium bicarbonate. Powders containing sodium bicarbonate may not be indicated for root surface treatment.
本研究旨在分析含碳酸氢钠或甘氨酸的空气抛光粉所引起的牙根表面粗糙度。
将人类磨牙的牙根切成牙本质盘，并用三种不同的粉末进行照射：(A)碳酸氢钠（dv50 = 62μm），(B)甘氨酸（dv50 = 49μm）和(C)甘氨酸（dv50 = 21μm）。在仪器操作时间（5秒和10秒）、压力（1.8巴）、距离（2毫米和5毫米）和角度（45°和90°）方面采用标准化条件。通过表面轮廓值“Pa”和“Pt”以及表面粗糙度值“Rz”分析探针的表面粗糙度（DIN EN ISO 4287:1998）。研究了每种牙本质盘上处理（处理过的与未处理的）的效果。计算混合效应模型的几何平均比（GMR）和置信区间（95%CI）。
对于Pa，总体效应的比较显示粉末A与B之间存在显著差异（GMR 3.57，95%CI 2.87 - 4.43，p < 0.001）以及粉末A与C之间存在显著差异（GMR 2.72，95%CI 2.20 - 3.37，p < 0.001）。对于Pt，粉末A与B之间存在显著差异（GMR 2.49，95%CI 2.11 - 2.94，p < 0.001）以及粉末A与C之间存在显著差异（GMR 2.39，95%CI 2.03 - 2.82，p < 0.001）。在粉末B和C之间，Pa、Rz和Pt没有显著差异。
与含碳酸氢钠的粉末相比，含甘氨酸的空气抛光粉对人类牙根表面造成的改变明显更少。
与含碳酸氢钠的粉末相比，含甘氨酸的粉末导致牙根表面粗糙度的增加显著更低。含碳酸氢钠的粉末可能不适合用于牙根表面处理。
