Bennett Zackary Y, Walsh Laurence J
University of Queensland, Brisbane, Queensland, Australia.
Lasers Med Sci. 2015 Sep;30(7):1823-8. doi: 10.1007/s10103-014-1675-4. Epub 2014 Oct 7.
In some well-established laser applications where large spot sizes are used, an array of high-intensity light emitting diodes (LED) emitting at similar wavelength could potentially replace the laser. This situation applies for the photodynamic bleaching of stains in teeth. This study compared the relative efficacy of an array of visible green LED (535 nm ± 15 nm) with a KTP laser in photodynamic bleaching of tetracycline-stained dentine in human tooth roots. After establishing consistent staining in 96 roots using a validated method, the roots were sectioned into 2-3-mm thick horizontal slices that were treated with gels containing rhodamine B (Smartbleach® or Smartbleach® 3LT). Colour changes were tracked up to 1 month after treatment. While both systems were effective in bleaching the tetracycline-stained dentine, KTP laser activation gave greater bleaching efficacy than LED activation, enhancing the action of the gel. Use of the KTP laser would be preferable over an LED system when confronted with tetracycline staining. Use of this photodynamic bleaching method offers valuable means to reduce the severity of tetracycline staining.
在一些使用大光斑尺寸的成熟激光应用中，发射相似波长光的高强度发光二极管（LED）阵列有可能替代激光。这种情况适用于牙齿污渍的光动力漂白。本研究比较了可见绿光LED阵列（535 nm±15 nm）与KTP激光在人牙根四环素染色牙本质光动力漂白中的相对效果。使用经过验证的方法在96个牙根中建立一致的染色后，将牙根切成2 - 3毫米厚的水平切片，用含有罗丹明B（Smartbleach®或Smartbleach® 3LT）的凝胶处理。在治疗后长达1个月的时间内跟踪颜色变化。虽然两种系统在漂白四环素染色牙本质方面都有效，但KTP激光激活比LED激活具有更高的漂白效果，增强了凝胶的作用。在面对四环素染色时，使用KTP激光比LED系统更可取。使用这种光动力漂白方法为降低四环素染色的严重程度提供了有价值的手段。
