Institute of Stomatology, College of Stomatology, Nanjing Medical University, Nanjing, People's Republic of China.
Clin Oral Investig. 2011 Dec;15(6):869-78. doi: 10.1007/s00784-010-0453-3. Epub 2010 Aug 13.
The purpose was to investigate by push-out tests and scanning electron microscopy (SEM)/energy-dispersive spectroscopy (EDS) the effect, after first acid etching the post space walls, of three radicular dentine treatments on the regional bond strength of quartz fibre posts placed using two heavily filled resin luting cements. The crowns of 39 extracted maxillary central incisors were sectioned transversely 2 mm coronal to the labial cement-enamel junction and the roots endodontically treated. After standardized post space preparations and etching 15 s with 32% phosphoric acid, 36 roots were randomly divided into six equal groups. Quartz fibre posts (D.T. LIGHT-POST) were placed using three radicular dentine treatments (0.9% sodium chloride (NaCl) for 60 s, 10% sodium hypochlorite (NaOCl) for 60 s, 17% ethylenediaminetetraacetic acid (EDTA) for 60 s followed by 5.25% NaOCl for 60 s) and two resin composite luting cements (ONE-STEP PLUS/DUO-LINK; ONE-STEP PLUS/LuxaCore Dual). Transverse segments (S1-S7), 1.00 mm (SD = 0.05 mm) thick, were sectioned from the coronal 8 mm of each root. Push-out bond strength tests were performed on coronal, middle and apical post space segments (S2, S4, S6) at a crosshead speed of 0.5 mm/min. Data were recorded and analyzed using a two-way mixed ANOVA design (a = 0.05). Three segments (S1, S5, S7) from roots in each group were examined using SEM/EDS. After post space preparation, acid etching and using each of the three radicular dentine treatments, the three remaining roots were sectioned longitudinally for SEM observation of the post space walls. At all root segment sites, the mean bond strengths from using 0.9% NaCl were significantly lower than for the other two radicular dentine treatments (P ≤ 0.02), and DUO-LINK cement had significantly higher mean bond strengths than LuxaCore Dual cement (P ≤ 0.01). There was a significant linear trend for reduced bond strengths from coronal to apical post space segments (P < 0.001), which was supported by the SEM/EDS observations of dentine tubule appearance and resin tag formation. Acid etching followed by either 10% NaOCl or 17% EDTA and 5.25% NaOCl dentine treatments of the post spaces provided good adhesion and resin luting cement tag infiltration of dentinal tubules in the coronal and middle segments in particular.
通过推出试验和扫描电子显微镜（SEM）/能谱（EDS）研究，在酸蚀根管内壁后，三种根管内牙本质处理方法对使用两种高填充树脂水门汀的石英纤维桩的区域性粘结强度的影响。从 39 颗上颌中切牙中随机选择 39 颗，在近唇釉牙骨质界上方 2mm 处横断牙冠，然后进行根管治疗。用 32%磷酸酸蚀 15s 后，进行标准化的桩腔预备。然后将 36 个牙根随机分为 6 个相等的组。使用三种根管内牙本质处理方法（0.9%氯化钠（NaCl）处理 60s，10%次氯酸钠（NaOCl）处理 60s，17%乙二胺四乙酸（EDTA）处理 60s，然后再用 5.25%NaOCl 处理 60s）和两种树脂复合水门汀（ONE-STEP PLUS/DUO-LINK；ONE-STEP PLUS/LuxaCore Dual）放置石英纤维桩（D.T. LIGHT-POST）。从每个牙根的冠部 8mm 处切取 1.00mm（SD=0.05mm）厚的横向段（S1-S7）。在横头速度为 0.5mm/min 的情况下，对根管的冠、中、根尖段（S2、S4、S6）进行推出粘结强度测试。使用双向混合方差设计（a=0.05）记录和分析数据。每组中的 3 个牙根的 3 个段（S1、S5、S7）用 SEM/EDS 进行检查。在根管内壁酸蚀和使用三种根管内牙本质处理方法后，其余 3 个牙根被纵向切开，用于观察根管内壁的 SEM。在所有根段部位，使用 0.9%NaCl 的平均粘结强度明显低于其他两种根管内牙本质处理方法（P≤0.02），而 DUO-LINK 水门汀的平均粘结强度明显高于 LuxaCore Dual 水门汀（P≤0.01）。从根管到根尖的根管段的粘结强度呈显著线性下降趋势（P<0.001），这一趋势得到了 SEM/EDS 观察到的牙本质小管外观和树脂标记形成的支持。酸蚀后用 10%次氯酸钠或 17%乙二胺四乙酸和 5.25%次氯酸钠处理根管内壁，可在冠中和中部特别好地附着和渗透牙本质小管中的树脂水门汀标记。
