Kim Hae-Jung, Choi Hyung-Jun, Kim Ki-Yeol, Kim Kwang-Mahn
J Clin Pediatr Dent. 2020;44(1):41-46. doi: 10.17796/1053-4625-44.1.7.
To evaluate penetration of a flowable resin composite into fissures using three different application methods: (1) conventional, (2) heat, and (3) sonic vibration.
Forty-five sound maxillary third molars were divided randomly into three groups (n=15 per group). The occlusal surfaces of the teeth were etched and flowable resin composites were applied into the fissure using the assigned application method. The crowns were sectioned and examined with an optical microscope to assess penetration. In addition, three-point flexural strength was analyzed.
The sonic vibration group exhibited significantly greater penetration into the fissure compared with the other test groups (p<0.001). The heat group exhibited greater penetration into the fissure compared with the conventional group (p=0.003). However, three-point flexural strength was similar among all groups (p>0.05).
Sonic vibration and heat increased penetration into fissures. Notably, sonic vibration exhibited the greatest penetration. We found that the application method did not influence the three-point flexural strength.
使用三种不同的应用方法评估可流动树脂复合材料渗入裂隙的情况：（1）传统方法，（2）加热，（3）超声振动。
45颗完好的上颌第三磨牙随机分为三组（每组n = 15）。对牙齿的咬合面进行酸蚀，然后使用指定的应用方法将可流动树脂复合材料应用于裂隙中。将牙冠切片并通过光学显微镜检查以评估渗入情况。此外，还分析了三点弯曲强度。
与其他测试组相比，超声振动组在裂隙中的渗入明显更大（p < 0.001）。与传统组相比，加热组在裂隙中的渗入更大（p = 0.003）。然而，所有组之间的三点弯曲强度相似（p > 0.05）。
超声振动和加热增加了对裂隙的渗入。值得注意的是，超声振动的渗入最大。我们发现应用方法不影响三点弯曲强度。
