两种全冠修复体对低龈距年轻恒磨牙牙周组织的影响

目的：探讨两种材料的全冠修复体对低牙合龈距年轻恒磨牙牙周组织的影响。方法：选择24例低牙合龈距年轻恒磨牙分别采用钴铬合金全冠、金铂合金全冠进行修复,全冠戴入4周后复诊,分别检测修复后4、12周各项牙周指标及患牙的龈沟液量（GCF）。结果：修复前和修复后4周时,两组间各检测指标无明显差异,修复后12周时钴铬合金全冠组的GCF量、菌斑指数、龈沟出血指数均高于修复前、修复后4周和金铂合金全冠组。结论：临床合格的钴铬合金全冠对低牙合龈距年轻恒磨牙牙周组织在短时期内有一定不利影响,金铂合金全冠则影响相对较小。

Effects of two crowns materials on periodontal tissue for the frist permanent molars with lower occlusogingival distance

Objective To evaluate the influences of two crowns materials on periodontal tissue for the frist permanent molar with lower occlusogingival distance. Methods Twenty-four frist permanent molar with lower occlusogingival distance were divided into two groups randomly for Co-Cr alloy crown and Au-Pt alloy crown.After crowns placement for 4 weeks,the gingival crevilar fluid （GCF）sample were collected and weighted,then the clinnical parameters such as sulcus bleeding index （SBI）,plaque index （PLI）were recorded. Results Before tooth preparation and 4 weeks after cementation,all indexes showed no difference among two groups.The level of GCF,SBI,PLI of Co-Cr alloy crown showed conspicuous difference with Au-Pt alloy crown after 12 weeks. Conclusion Co-Cr alloy crowns being clinically accepted have negative influences on gingival health of the restored teeth. Au-Pt alloy crowns may affecct periodontium less than the Co-Cr alloy crowns in observation of this study.