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首页> 外文期刊>Photodiagnosis and Photodynamic Therapy >Effect of photodynamic therapy and ErCrYSGG laser irradiation on the push-out bond strength between fiber post and root dentin
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Effect of photodynamic therapy and ErCrYSGG laser irradiation on the push-out bond strength between fiber post and root dentin

机译：光动力疗法和ErCrYSGG激光照射对纤维桩与牙本质牙本质顶出结合强度的影响

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Background: To evaluate the push out bond strength and modes of failure of fiber post by using photodynamic therapy (PDT), Er,Cr:YSGG laser and conventional cleaning and shaping (CCS).Methods: Sixty maxillary anterior teeth were sectioned horizontaly 2 mm incisal to the cemento-enamel junction, and root canal were prepared for post space. Tapered fiber posts were placed inside the root canal after post space was made. The fiber posts were subjected to PDT, Er,Cr:YSGG laser and CSS with 20 specimens in each group. The specimens obtained were sectioned in cervical and apical sections. A universal testing machine was used to perform the push out test and the push out bond strength was formulated by sigma = C/A, expressed in megapascals (MPa).Results: The highest mean push out bond strength was achieved by PDT group (8.08 +/- 2.73 MPa) and the lowest was shown by specimens in CCS group (7.45 +/- 1.04 MPa). ANOVA showed no statistical difference among the experimental groups (p = 0.481). In the cervical segments, the mean push-out bond strength was found to be slightly higher for all three groups compared to apical segments (P < 0.05). The independent t-tests results showed that the mean push-out bond strength values of the cervical segments were slightly higher than the apical segments in PDT, Er,Cr:YSGG and CSS groups (P < 0.05). Significant differences were observed when mean push-out bond strengths were compared for both cervical (p = 0.037) and apical (p = 0.019) segments between all the groups. Twenty-one failures were found at the interface between the adhesive and the dentin surface, 6 failures were observed at the interface between the adhesive and post, whereas 5 failures were mixed.Conclusion: Push-out bond strength to root canal dentin were not affected by Er,Cr:YSGG compared with conventional cleaning and shaping. However, PDT produced the smallest number of failure modes and slightly higher push-out bond strength to root dentin.
机译：背景：通过光动力疗法（PDT），Er，Cr：YSGG激光和常规清洁成形法（CCS）评估纤维柱的推出强度和破坏方式。方法：将60颗上颌前牙水平切成2 mm在牙釉质-牙釉质交界处切开，并准备了根管用于后间隙。形成桩空间后，将锥形纤维桩放置在根管内。光纤柱经过PDT，Er，Cr：YSGG激光和CSS的测试，每组20个样品。将获得的标本切成宫颈和根尖切片。使用万能测试机进行推出测试，推出强度以σ= C / A表示，以兆帕（MPa）表示。结果：PDT组获得了最高的平均推出强度（8.08） （+/- 2.73 MPa），最低的是CCS组的标本（7.45 +/- 1.04 MPa）。方差分析显示实验组之间无统计学差异（p = 0.481）。在宫颈节段中，发现三组的平均推出力均比顶端节段略高（P <0.05）。独立的t检验结果显示，PDT，Er，Cr：YSGG和CSS组的子宫颈节段的平均推出力强度值略高于顶端节段（P <0.05）。当比较所有组的子宫颈（p = 0.037）和心尖（p = 0.019）部分的平均推出强度时，观察到显着差异。在胶粘剂与牙本质表面之间的界面处发现了21个破坏，在胶粘剂与桩之间的界面中发现了6个破坏，而混合了5个破坏。结论：与根管牙本质的推挤结合强度不受影响由Er，Cr：YSGG制成，与传统的清洗和定型相比。但是，PDT产生的破坏模式最少，而与根部牙本质的推出强度略高。

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