Aim

The aim of the present study was to evaluate the efficacy of 30^°-angled Er:YAG laser tip and different periodontal instruments on root surface roughness and morphology in vitro.

Methods

Eighteen bovine teeth root without carious lesion were decoronated from the cementoenamel junction and seperated longitidunally. A total of 36 obtained blocks were mounted in resin blocks and polished with silicon carbide papers under water irrigation. These blocks were randomly assigned into 3 treatment groups. In Group 1, 30°-angled Er:YAG laser (2.94 μm) tip was applied onto the blocks with a 20 Hz, 120 mJ energy output under water irrigation for 20 s. In Groups 2 and 3, the same treatment was applied to the blocks with new generation ultrasonic tip and conventional curette apico-coronally for 20 s with a sweeping motion. Surface roughness and morphology were evaluated before and after instrumentation with a profilometer and SEM, respectively.

Results

After instrumentation, profilometric analysis revealed significantly higher roughness values compared to baseline in all treatment groups(p < 0.05). Laser group revealed the roughest surface morphology followed by conventional curette and new generation ultrasonic tip treatment groups (p < 0.05). In SEM analysis, irregular surfaces and crater defects were seen more frequently in the laser group.

Conclusion

Results of the study showed that the use of new generation ultrasonic tip was associated with smoother surface morphology compared to 30°-angled Er-YAG laser tip and conventional curette. Further in vitro and in vivo studies with an increased sample size are necessary to support the present study findings.

中文翻译：

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应用不同牙周器械和 Er:YAG 激光后的牙根表面粗糙度评估：轮廓测量和 SEM 研究

目的

^{本研究的目的是评估 30 °}角 Er:YAG 激光尖端和不同牙周器械对体外牙根表面粗糙度和形态的功效。

方法

将18颗无龋损的牛牙根从牙釉质交界处脱除，纵向分离。将总共​​36块获得的块安装在树脂块中并在水冲洗下用碳化硅纸抛光。这些组被随机分配到 3 个治疗组。在第 1 组中，将 30° 角的 Er:YAG 激光 (2.94 μm) 尖端应用于块上，在水灌溉下以 20 Hz、120 mJ 的能量输出持续 20 秒。在第 2 组和第 3 组中，使用新一代超声波尖端和传统刮匙在顶冠上扫动，对块进行相同的处理 20 秒。分别使用轮廓仪和扫描电镜在安装之前和之后评估表面粗糙度和形态。

结果

仪器安装后，轮廓分析显示所有治疗组的粗糙度值均显着高于基线（p  < 0.05）。激光组显示出最粗糙的表面形态，其次是传统刮匙和新一代超声尖端治疗组（p  < 0.05）。在 SEM 分析中，激光组更常见不规则表面和凹坑缺陷。

结论

研究结果表明，与 30° 角 Er-YAG 激光尖端和传统刮匙相比，使用新一代超声波尖端可实现更光滑的表面形态。需要进一步增加样本量的体外和体内研究来支持目前的研究结果。