Bijelic Jasmina, Garoushi Sufyan, Vallittu Pekka K, Lassila Lippo V J
Turku Clinical Biomaterials Centre, Institute of Dentistry, University of Turku, Turku, Finland.
Open Dent J. 2011 Mar 29;5:58-65. doi: 10.2174/1874210601105010058.
This study evaluated the load bearing capacity of anatomically designed canines restored with FRC posts and experimental short fiber composite resin (FC). The effect of using three different types of tooth preparation and woven net on the fracture load was also investigated. Further aim was to evaluate the failure mode of each restoration.
80 maxillary frasaco-canines were divided into 10 groups (n=8). The anatomic crowns were cut perpendicular at CEJ of the tooth. Group 1 was composed of teeth with flattened surface. Groups 2, 3 & 4 were prepared of teeth with 2 mm ferrule. In the third group, everStick Net was applied above the ferrule. Group 5 was composed of teeth with large box type preparation. The root canals were enlarged, sandblasted and then surface treated with Stick resin for 5 min. Two types of FRC root canal posts were used. The crowns were prepared either with composite resin or with FC. A static load until failure was applied to the crowns at a 45 degrees angle. Failure modes were visually examined.
ANOVA revealed that use of FRC-post and tooth preparation (p<0.001) had significant effect on fracture load of FRC-crown. The crowns made from only FC gave comparable fracture load to groups with FRC-post. No significant difference was found in load-bearing capacity between restorations reinforced with FRC net-substructure and those without (p>0.001). Chi-square test revealed that both, crown design and existence of FRC-post effected significantly fracture types (p<0.001).
FC demonstrated similar load bearing capacity with restorations reinforced with FRC post. The presence of ferrule around the tooth increased the load bearing capacity significantly.
EET - endodontically treated teeth; FRC - fiber-reinforced composite; semi-IPN - semi-interpenetrating network; CEJ - cementoenamel junction; FC - experimental short fiber composite; SiC - silicon carbide abrasive paper; N - newton; FEM - finite element method.
本研究评估了采用纤维增强复合树脂（FRC）桩和实验性短纤维复合树脂（FC）修复的解剖学设计犬牙的承载能力。还研究了使用三种不同类型的牙体预备和编织网对断裂载荷的影响。进一步的目的是评估每种修复体的失败模式。
80颗上颌尖牙分为10组（每组n = 8）。在牙冠颈缘（CEJ）处垂直截断解剖学牙冠。第1组由表面平整的牙齿组成。第2、3和4组的牙齿制备有2mm的箍。在第3组中，在箍上方应用everStick网。第5组由大盒状预备的牙齿组成。根管扩大、喷砂，然后用Stick树脂表面处理5分钟。使用了两种类型的FRC根管桩。牙冠用复合树脂或FC制备。以45度角对牙冠施加直至破坏的静态载荷。通过肉眼检查失败模式。
方差分析显示，使用FRC桩和牙体预备（p < 0.001）对FRC牙冠的断裂载荷有显著影响。仅由FC制成的牙冠与使用FRC桩的组具有相当的断裂载荷。用FRC网子结构增强的修复体和未增强的修复体之间在承载能力上没有发现显著差异（p > 0.001）。卡方检验显示，牙冠设计和FRC桩的存在均对断裂类型有显著影响（p < 0.001）。
FC显示出与用FRC桩增强的修复体相似的承载能力。牙齿周围箍的存在显著提高了承载能力。
EET - 根管治疗后的牙齿；FRC - 纤维增强复合材料；半互穿网络；CEJ - 牙骨质釉质界；FC - 实验性短纤维复合材料；SiC - 碳化硅砂纸；N - 牛顿；FEM - 有限元法
