School and Hospital of Stomatology, Wenzhou Medical University, 268#, Xueyuan West Road, Lucheng District, , Wenzhou City, 325027, Zhejiang Province, China.
Department of Stomatology, Jiaxing Hospital of T.C.M, Jiaxing, 314000, China.
Lasers Med Sci. 2023 Jun 23;38(1):146. doi: 10.1007/s10103-023-03800-7.
Fiber post bonding failure remains an issue during crown restoration procedures. This experiment examines the bonding effect of combined Er:YAG laser treatment on both root canal and fiber post. Sixty extracted mandibular first premolars were randomly selected and divided into 6 groups (n = 10 per group): G1 (control group): root canal with 2.5% NaClO treatment, no treatment of fiber post; G2: root canal with 2.5% NaClO treatment and fiber post with airborne-particle abrasion; G3: root canal with Er:YAG laser treatment and fiber post with airborne-particle abrasion; G4: root canal with Er:YAG laser treatment, no treatment of fiber post; G5: root canal with 2.5% NaClO treatment, fiber post with Er:YAG laser irradiation; G6: combined Er:YAG laser irradiation of both root canal and fiber post. An Er:YAG laser with a wavelength of 2940 nm was used to treat the fiber post (4.5 W, 450 mJ, 10 Hz for 60 s at 100-μs pulse duration with 100% water cooling) and the root canal (1.5 W, 150 mJ, 10 Hz for 60 s at 100-μs pulse duration with 100% water cooling). When the root canal was treated with the laser, the fiber tip was inserted into the root canal to make a spiral reciprocating motion. Bond strength was analyzed by a micro push-out test. Data were analyzed using both the Tukey test and two-way ANOVA (α = 0.05). Failure modes were observed and counted through a stereo microscope. The root canal and fiber post surface analysis was performed using SEM. The bond strength of G3 and G6 were significantly enhanced compared to those of the other groups (p < 0.05). The SEM analysis showed that the smear layers of groups with root canals subjected to Er:YAG laser irradiation were significantly reduced compared to those of the control group (G1). In groups with fiber posts treated with Er:YAG laser irradiation, the surfaces of the fiber posts exhibited greater surface roughness and a certain degree of epoxy matrix removal. Through the combined Er:YAG laser irradiation of both root canal and fiber post, the bond strength between them was significantly enhanced, which was superior to the individual treatment of either fiber posts or root canal.
纤维桩粘结失败仍然是冠修复过程中的一个问题。本实验研究了 Er:YAG 激光处理对根管和纤维桩的粘结效果。从 60 颗下颌第一前磨牙中随机选择并分为 6 组（每组 10 颗）：G1（对照组）：根管用 2.5%次氯酸钠处理，纤维桩不处理；G2：根管用 2.5%次氯酸钠处理，纤维桩用喷丸处理；G3：根管用 Er:YAG 激光处理，纤维桩用喷丸处理；G4：根管用 Er:YAG 激光处理，纤维桩不处理；G5：根管用 2.5%次氯酸钠处理，纤维桩用 Er:YAG 激光照射；G6：根管和纤维桩联合用 Er:YAG 激光照射。使用波长为 2940nm 的 Er:YAG 激光处理纤维桩（4.5W，450mJ，10Hz，100-μs 脉冲持续时间，100%水冷，60s）和根管（1.5W，150mJ，10Hz，100-μs 脉冲持续时间，100%水冷，60s）。当根管用激光处理时，将纤维尖端插入根管中，进行螺旋往复运动。通过微推出试验分析粘结强度。使用 Tukey 检验和双向 ANOVA（α=0.05）分析数据。通过体视显微镜观察和计数失效模式。使用 SEM 分析根管和纤维桩表面。与其他组相比，G3 和 G6 的根管粘结强度明显增强（p<0.05）。SEM 分析显示，与对照组（G1）相比，经 Er:YAG 激光处理的根管的玷污层明显减少。经 Er:YAG 激光处理的纤维桩表面显示出更大的表面粗糙度和一定程度的环氧基体去除。通过根管和纤维桩的联合 Er:YAG 激光照射，显著增强了它们之间的粘结强度，优于纤维桩或根管的单独处理。
