CAJ | 학술논문

目的：评价全酸蚀粘结系统（ PB）和自酸蚀粘结系统（ GB）对放射线损伤牙釉质的粘结效果。方法：将20个新鲜完整的离体第三磨牙随机分成4组（n＝5）。P1、G1为实验组，分次完成总量为60 Gy的60Co照射；PR、GR 为对照组，不作任何处理。照射完成后，PR、P1组用PB粘结；GR、G1组用GB粘结，然后用扫描电镜及万能材料测试机分别对其粘结界面和微拉伸粘结强度（ MBS）进行分析和检测。结果：牙釉质MBS P1组低于PR 组（P＝0．00）；G1组与GR 组比较P＞0．05。两种粘结系统间比较，牙釉质MBS PR 组高于GR 组（P＝0．00）；P1与G1组比较，P＞0．05。扫描电镜下，4组样本的拉伸断裂模式多为粘结界面和混合断裂模式，各组间无显著差异（P＞0．05），PR组牙釉质与粘结剂形成的混合层厚度均匀，而P1组混合层厚度不均匀，树脂突结构紊乱。 G1组的混合层较GR 组薄，仅少量树脂突形成。结论：PB和GB对放射线损伤牙釉质的MBS均降低，二者效果无明显差别。
목적：평개전산식점결계통（ PB）화자산식점결계통（ GB）대방사선손상아유질적점결효과。방법：장20개신선완정적리체제삼마아수궤분성4조（n＝5）。P1、G1위실험조，분차완성총량위60 Gy적60Co조사；PR、GR 위대조조，불작임하처리。조사완성후，PR、P1조용PB점결；GR、G1조용GB점결，연후용소묘전경급만능재료측시궤분별대기점결계면화미랍신점결강도（ MBS）진행분석화검측。결과：아유질MBS P1조저우PR 조（P＝0．00）；G1조여GR 조비교P＞0．05。량충점결계통간비교，아유질MBS PR 조고우GR 조（P＝0．00）；P1여G1조비교，P＞0．05。소묘전경하，4조양본적랍신단렬모식다위점결계면화혼합단렬모식，각조간무현저차이（P＞0．05），PR조아유질여점결제형성적혼합층후도균균，이P1조혼합층후도불균균，수지돌결구문란。 G1조적혼합층교GR 조박，부소량수지돌형성。결론：PB화GB대방사선손상아유질적MBS균강저，이자효과무명현차별。
AIM: To evaluate the bonding effects of total-etch adhesive system ( Prime&Bond NT, PB) and all in one self-etching adhesive system(G-Bond, GB) to irradiated enamel.METHODS:20 freshly extracted caries-free third molars were randomly divided into 4 groups ( n=5). The experimental groups were irradiated with 60Co of 60Gy, and were then bonded with PB(P1 group) and GB(G1 group) respectively.Samples in control groups received no irradiation and were bonded with PB (PR group) and GB (GR group) respectively.The microtensile bond strength(MBS) was measured on a Micro Tester , the bond interface was observed by SEM. RESULTS: The MBS of P1 group was weaker than PRgroup (P=0. 00), and that of G1 was not statistically different from that of GR(P>0.05).The MBS was not statistically different between PR and GR( P>0.05).No significant structural differ-ence was observed among the 4 groups under SEM. CONCLUSION:Irradiation decreases the MBS of PB and GB ad-hesives to enamel. Total-and self-etching bonding systems have similar effect for bongind irradiated enamel.