点焊和激光焊接正畸带中微生物定植的比较评估：定量分析

摘要(中文译文)

目的 本研究定量评估并比较点焊与激光焊接正畸带环的细菌计数。开展本研究的必要性源于以下担忧：传统点焊正畸带环可能形成不规则表面和微间隙，有利于菌斑堆积和细菌定植，从而增加正畸治疗期间釉质脱矿和牙周炎症的风险。激光焊接被认为是一种替代技术，能够产生更光滑、更精确的接头，并可能减少细菌滞留。然而，比较这两种焊接技术相关细菌定植的临床证据有限。因此，本研究旨在评估和比较点焊与激光焊接正畸带环上的细菌计数。为实现这一目的，采用了以下方法。方法 本研究采用裂口设计，纳入10名需要正畸治疗的受试者。在下颌左右两侧分别粘接激光焊接带环和点焊带环，分别代表实验侧和对照侧。由同一名检查者在基线和一个月后从对照侧和实验侧的颊面和舌面采集菌斑，以防止个体间偏倚。菌斑经系列稀释后接种于含琼脂作为生长培养基的培养平板上。三天后，使用数字菌落计数器计数细菌菌落数，得出菌落形成单位（CFUs）。结果 研究显示，带环放置后，点焊侧和激光焊接侧的颊面和舌面细菌计数均显著增加。点焊侧的细菌计数高于激光焊接侧，但差异无统计学意义（p>0.05）。结论 基于本研究，激光焊接与传统点焊正畸带环之间无显著的微生物学差异。但在缺乏最佳口腔卫生的情况下，正畸带环的存在会促进菌斑生长。因此，应对患者进行教育和激励，以维持良好的口腔卫生。

Abstract

Objective The present study quantitatively evaluated and compared bacterial counts between spot-welded and laser-welded orthodontic bands. The need for the study arose from concerns that conventional spot-welded orthodontic bands may create irregular surfaces and microgaps that favor plaque accumulation and bacterial colonization, thereby increasing the risk of enamel decalcification and periodontal inflammation during orthodontic treatment. Laser welding has been proposed as an alternative technique capable of producing smoother and more precise joints with potentially reduced bacterial retention. However, limited clinical evidence is available comparing bacterial colonization associated with these two welding techniques. Therefore, this study was undertaken to assess and compare bacterial counts on spot-welded and laser-welded orthodontic bands. To address this objective, the following methodology was implemented. Methodology The study employed a split-mouth design with 10 subjects requiring orthodontic treatment. Laser-welded bands and spot-welded bands on the right and left sides of the mandible were cemented, which represent the experimental and control sides, respectively. Plaque was collected from buccal and lingual surfaces on both control and experimental sides at baseline and after one month by a single examiner to prevent inter-individual bias. Plaque was diluted by serial dilution and then inoculated onto a culture plate containing agar as the growth medium. After three days, the number of bacterial colonies was counted using a digital colony counter, yielding colony-forming units (CFUs). Results The study showed that bacterial counts increased significantly on both the spot-welded and laser-welded sides after band placement on the buccal and lingual aspects. The bacterial count was higher on the spot-welded side than on the laser-welded side, but the difference was not statistically significant (p>0.05). Conclusions Based on the study, there was no significant microbiological difference between laser-welded and conventional spot-welded orthodontic bands. But the presence of orthodontic bands, in the absence of optimal oral hygiene, will promote plaque growth. So, patients should be educated and motivated to maintain good oral hygiene.

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