Vicente María, Gomes Ana L, Montero Javier, Rosel Eva, Seoane Vicente, Albaladejo Alberto
Dental Clinic (Faculty of Medicine), University of Salamanca. Paseo Universidad de Coimbra, s/n, 37007, Salamanca, Spain.
Contracted Professor of Dental Clinic (Faculty of Medicine), University of Salamanca. Paseo Universidad de Coimbra, s/n, 37007, Salamanca, Spain.
Lasers Surg Med. 2016 Jan;48(1):36-44. doi: 10.1002/lsm.22442. Epub 2016 Jan 6.
The aim of this study was to evaluate the influence of cyclic loading on the shear bond strength (SBS) of a self-adhesive resin cement to zirconia surfaces after femtosecond laser irradiation at different steps and several conventional surface treatments.
One hundred fifty square-shaped zirconia samples were divided into five groups according their surface treatment: NT Group-no surface treatment; APA25 Group-airborne abrasion with 25 μm alumina particles; TSC Group-tribochemical silica coating; FS20 Group-femtosecond laser irradiation (800 nm, 4 mJ, 40 fs/pulse, 1 kHz, step 20); and FS40 Group-femtosecond laser irradiation (same parameters except step 40). Self-adhesive resin cement cylinders were bonded at the centre of the zirconia surface. For each experimental group, half of the specimens were subject to cyclic loading under 90 N (50.000 cycles, 3 cycles/sec) and the rest of the specimens were stored in distilled water at 37°C. All subgroups were tested for SBS with a universal testing machine at a crosshead speed of 0.5 mm/min, until fracture. The results were analyzed statistically.
When cyclic loading was applied, all surface treatments had lower SBS values, except APA25. The four surface treatments had the same SBS values when cyclic loading was employed.
Use of femtosecond laser irradiation could be an alternative to conventional surface treatments to achieve suitable adhesion zirconia and resin cements. Femtosecond laser irradiation at step 40 is preferable because it is more efficient and faster.
本研究旨在评估在不同步骤的飞秒激光照射及几种传统表面处理后，循环加载对自粘树脂水门汀与氧化锆表面剪切粘结强度（SBS）的影响。
150个方形氧化锆样本根据其表面处理方式分为五组：NT组 - 未进行表面处理；APA25组 - 用25μm氧化铝颗粒进行空气喷砂处理；TSC组 - 摩擦化学硅涂层处理；FS20组 - 飞秒激光照射（800nm，4mJ，40fs/脉冲，1kHz，步骤20）；FS40组 - 飞秒激光照射（除步骤40外参数相同）。自粘树脂水门汀圆柱体粘结在氧化锆表面中心。对于每个实验组，一半样本在90N下进行循环加载（50000次循环，3次/秒），其余样本在37°C蒸馏水中储存。所有亚组均使用万能试验机以0.5mm/min的十字头速度测试SBS，直至断裂。对结果进行统计学分析。
施加循环加载时，除APA25组外，所有表面处理的SBS值均较低。采用循环加载时，四种表面处理的SBS值相同。
使用飞秒激光照射可作为传统表面处理的替代方法，以实现氧化锆与树脂水门汀的合适粘结。步骤40的飞秒激光照射更可取，因为它更高效、更快。
