Unit of Orthodontics and Paediatric Dentistry, Section of Dentistry, Department of Clinical, Surgical, Diagnostic and Paediatric Sciences, University of Pavia, 27100 Pavia, Italy.
Department of Biomaterial Science and Turku Clinical Biomaterials Centre-TCBC, Institute of Dentistry, University of Turku, 20100 Turku, Finland.
Int J Mol Sci. 2017 Oct 4;18(10):2096. doi: 10.3390/ijms18102096.
Fiber reinforced Composite (FRC) retainers have been introduced as an aesthetic alternative to conventional metallic splints, but present high rigidity. The purpose of the present investigation was to evaluate bending and fracture loads of FRC splints bonded with conventional full-coverage of the FRC with a composite compared with an experimental bonding technique with a partial (spot-) resin composite cover. Stainless steel rectangular flat, stainless steel round, and FRC retainers were tested at 0.2 and 0.3 mm deflections and at a maximum load. Both at 0.2 and 0.3 mm deflections, the lowest load required to bend the retainer was recorded for spot-bonded stainless steel flat and round wires and for spot-bonded FRCs, and no significant differences were identified among them. Higher force levels were reported for full-bonded metallic flat and round splints and the highest loads were recorded for full-bonded FRCs. At the maximum load, no significant differences were reported among spot- and full-bonded metallic splints and spot-bonded FRCs. The highest loads were reported for full bonded FRCs. The significant decrease in the rigidity of spot-bonded FRC splints if compared with full-bonded retainers suggests further tests in order to propose this technique for clinical use, as they allow physiologic tooth movement, thus presumably reducing the risk of ankylosis.
纤维增强复合材料（FRC）保持器已作为传统金属夹板的美学替代品引入，但具有较高的刚性。本研究的目的是评估 FRC 夹板的弯曲和断裂载荷，与传统的 FRC 全面覆盖的复合粘结技术相比，与部分（点状）树脂复合材料覆盖的实验粘结技术相比。对不锈钢矩形扁丝、不锈钢圆形丝和 FRC 保持器进行了 0.2 和 0.3mm 挠度和最大载荷的测试。在 0.2 和 0.3mm 挠度下，记录到弯曲保持器所需的最低载荷为点状粘结的不锈钢扁丝和圆丝以及点状粘结的 FRC，它们之间没有显著差异。全粘结金属扁丝和圆丝的力水平较高，全粘结 FRC 的载荷最高。在最大载荷下，点状和全粘结金属夹板和点状粘结的 FRC 之间没有显著差异。全粘结 FRC 的载荷最高。与全粘结保持器相比，点状粘结的 FRC 夹板的刚性显著降低，这表明需要进一步的测试才能将该技术用于临床，因为它们允许生理性牙齿移动，从而可能降低粘连的风险。
