Strefezza Claudia, Amaral Marcello Magri, Quinto José, Gouw-Soares Sheila Cynthia, Zamataro Claudia Bianchi, Zezell Denise Maria
1 Laboratory of Biophotonics, Center for Lasers and Applications , IPEN - CNEN/SP, São Paulo, Brazil .
2 Biomedical Engineering, Universidade Brasil , São Paulo, Brazil .
Photomed Laser Surg. 2018 Aug;36(8):439-444. doi: 10.1089/pho.2017.4378. Epub 2018 May 16.
The correct selections of the cementing agent, the endodontic post material and placement protocol are critical to provide an increased longevity of the teeth that went through endodontic treatment. The irradiation with diode laser before post cementation, can promote an antimicrobial effect. However, there is a lack of information about the effect of 830 nm diode laser on the post bond strength. This study analyzed the effect of dentin root canal irradiation with high-intensity diode laser, at 830 nm, operating in continuous or pulsed mode, on the retention of metal or fiber posts, cemented with self-etching resinous composite (Panavia F) and zinc phosphate cement (ZnPO).
Human roots were irradiated with diode laser (continuous and pulsed mode). The fiber posts were luted with Panavia F and the metal posts with Panavia F or ZnPO cement. Specimens were sectioned into three sections (cervical, middle, and apical). The bond strength was measured by a push-out mechanical analysis. For the statistical analysis, a three-way ANOVA test was applied following a Tukey's pairwise comparison with a significance level of p = 0.05.
The irradiated groups presented higher bond strength compared with nonirradiated group (p < 0.05), and the cervical and middle thirds presented higher on bond strength than the apical. The association of metal post and Panavia F presented higher bond strength when irradiated on continuous mode (p < 0.05). Fiber post and Panavia F presented higher bond strength associated to pulsed mode. The mode seems not to make a significant difference.
These results corroborate the importance of the post bond to dentin and root canal debris removal to increase the tooth longevity. It was shown that the dentin to post bond strength were enhanced by the diode laser irradiation either on continuous or pulsed modes.
正确选择粘结剂、根管桩材料及放置方案对于提高经根管治疗牙齿的使用寿命至关重要。桩粘结前用二极管激光照射可促进抗菌作用。然而，关于830nm二极管激光对桩粘结强度影响的信息较少。本研究分析了830nm高强度二极管激光以连续或脉冲模式照射牙本质根管对用自酸蚀树脂复合材料（Panavia F）和磷酸锌水门汀（ZnPO）粘结的金属或纤维桩固位力的影响。
用人牙根管进行二极管激光照射（连续和脉冲模式）。纤维桩用Panavia F粘结，金属桩用Panavia F或ZnPO水门汀粘结。标本切成三段（颈部、中部和根尖部）。通过推出式力学分析测量粘结强度。统计分析采用三因素方差分析，随后进行Tukey两两比较，显著性水平为p = 0.05。
与未照射组相比，照射组的粘结强度更高（p < 0.05），颈部和中部三分之一处的粘结强度高于根尖部。连续模式照射时，金属桩与Panavia F组合的粘结强度更高（p < 0.05）。纤维桩与Panavia F组合在脉冲模式下粘结强度更高。模式似乎没有显著差异。
这些结果证实了桩与牙本质粘结以及去除根管碎屑对提高牙齿寿命的重要性。结果表明，二极管激光连续或脉冲模式照射均可提高牙本质与桩的粘结强度。
