摘要
目的:对冠缺损达龈下患牙行牙冠延长术后修复的效果进行评价。方法:选择62颗冠缺损达龈下1.5～4mm、松动度(MD)≤Ⅰ度、冠根比例协调的患牙,采用翻瓣联合骨切除的方法行牙冠延长术,术后4周常规修复,随访1a。分别记录手术前后不同阶段的MD、龈沟出血指数(SBI)和缺损最深位点处的探诊深度(PD);并将46颗前牙按术前的PD值分为浅缺损组(<2.5mm)和深缺损组(2.5～4mm)。所得数据用t检验进行疗效评价。结果:(1)52颗患牙取得满意效果,总有效率为83.9%。(2)PD和SBI有明显改善(P<0.01),但MD有增大趋势(P<0.01)。(3)两组前牙的MD在术前无显著差异(P>0.05),但在修复后1年深缺损组的MD明显高于浅缺损组(P<0.01),且术后各阶段的MD与术前的PD呈显著相关(r=0.489,0.526,0.531,P<0.01)。结论:牙冠延长术能在保证生物学宽度的条件下,对冠缺损达龈下患牙有较好的治疗效果,但因术后MD有增大趋势,且与术前的PD密切相关,故选择适应证时宜慎重。
PURPOSE: To evaluate the clinical effect of the teeth with subgingivally involved defect which were conserved by crown lengthening surgery. METHODS: 62 teeth,with defect subgingivally from 1.5 mm to 4 mm,mobility degree(MD)≤Ⅰdegree,appropriate proportion between crown and root,underwent crown lengthening surgery by combining flap surgery and osteoectomy,and restored 4 weeks after operation and followed-up for one year. The parameters of MD,sulcus bleeding index (SBI) and maximal defect probing depth (PD) at different times were measured respectively. 46 anterior teeth were divided into two groups based on PD of pre-operation. The groups were as follows: minor defect group (<2.5mm) and major defect group (2.5 to 4mm).The results were evaluated by student,s t test. RESULTS: The overall effective rate was 83.9%. PD and SBI demonstrated a significant improvement (P<0.01),but MD showed an increasing trend after operation (P<0.01). No significant difference about MD of anterior teeth in two groups was found before operation (P>0.05),but a significant increase about MD occured in the major defect group one year after restoration (P<0.01),and there was significant correlation between MD of each stage after operation and PD of pre-operation in anterior teeth (r=0.489,0.526,0.531,P<0.01). CONCLUSIONS: According to the biological width principle,crown lengthening surgery may conserve these teeth with subgingivally involved defect,and has a good,long-time clinical effect. But MD showed an increasing trend after operation and significant correlation with the PD of pre-operation,so the indication must be selected properly.
出处
《上海口腔医学》
CAS
CSCD
2005年第1期24-27,共4页
Shanghai Journal of Stomatology
关键词
牙冠延长术
治疗效果
生物学宽度
Crown lengthening surgery
Treatment outcome
Biological width
