發(fā)布時(shí)間：2018-01-31 01:10

  本文關(guān)鍵詞： 牙本質(zhì) 次氯酸鈉 微拉伸粘接強(qiáng)度　出處：《北京大學(xué)學(xué)報(bào)(醫(yī)學(xué)版)》2017年01期 　論文類型：期刊論文

【摘要】：目的:研究根管治療過(guò)程中次氯酸鈉(sodium hypochlorite,Na OCl)沖洗溶液對(duì)牙本質(zhì)粘接強(qiáng)度的影響。方法:選取新鮮拔除的人第三磨牙15顆,牙冠完整無(wú)齲壞,未經(jīng)牙體或牙髓治療,去除釉質(zhì),暴露中層牙本質(zhì),600目砂紙打磨牙本質(zhì)表面1 min,去離子水沖洗1 min,制備牙本質(zhì)平面試件。試件隨機(jī)分為3組,采用不同表面處理方法后制作粘接試件:A組(陰性對(duì)照組),去離子水處理牙本質(zhì)平面試件20 min;B組(2.50%Na OCl實(shí)驗(yàn)組),2.50%Na OCl溶液處理牙本質(zhì)平面試件20 min,每5分鐘更換1次新鮮溶液;C組(5.25%Na OCl實(shí)驗(yàn)組),5.25%Na OCl溶液處理牙本質(zhì)平面試件20 min,每5分鐘更換1次新鮮溶液。處理后所有試件表面均使用自酸蝕粘接劑SE bond進(jìn)行粘接處理,上方堆塑5 mm高的AP-X復(fù)合樹(shù)脂,分層固化后,粘接試件置于37℃去離子水中儲(chǔ)存24 h后,使用金剛石切割機(jī)垂直于粘接界面切割,制作1.0 mm×1.0 mm條狀試樣(n=45)。用微拉伸測(cè)試儀測(cè)試條狀試樣微拉伸粘接強(qiáng)度(MPa),體視顯微鏡下觀察試樣斷裂類型(界面破壞、內(nèi)聚破壞及混合破壞類型),采用單因素方差分析比較不同實(shí)驗(yàn)組的微拉伸粘接強(qiáng)度,并用Post-hoc test(LSD)法進(jìn)行兩兩比較,應(yīng)用卡方檢驗(yàn)比較不同組之間斷裂類型分布的差異,并進(jìn)行兩兩比較。結(jié)果:2.50%Na OCl實(shí)驗(yàn)組[(26.04±5.74)MPa]和5.25%Na OCl實(shí)驗(yàn)組[(24.46±3.77)MPa]的粘接強(qiáng)度明顯低于未經(jīng)Na OCl溶液處理的陰性對(duì)照組[(48.71±7.77)MPa],P=0.000。與陰性對(duì)照組比較,2.50%和5.25%Na OCl實(shí)驗(yàn)組粘接強(qiáng)度分別下降了46.5%和50.2%,2.50%和5.25%Na OCl實(shí)驗(yàn)組間粘接強(qiáng)度差異無(wú)統(tǒng)計(jì)學(xué)意義(P=0.214)。不同實(shí)驗(yàn)組之間斷裂類型分布差異均具有統(tǒng)計(jì)學(xué)意義(χ~2=56.324,P=0.000),陰性對(duì)照組試樣斷裂類型以混合破壞類型(68.9%)為主,界面破壞類型(24.4%)次之,內(nèi)聚破壞類型(6.7%)最少,2.50%Na OCl實(shí)驗(yàn)組與5.25%Na OCl實(shí)驗(yàn)組發(fā)生界面破壞類型的比例明顯高于陰性對(duì)照組(P=0.000),2.50%Na OCl實(shí)驗(yàn)組和5.25%Na OCl實(shí)驗(yàn)組間的斷裂類型分布差異無(wú)統(tǒng)計(jì)學(xué)意義(P=0.197),且均未發(fā)現(xiàn)內(nèi)聚破壞。結(jié)論:Na OCl處理過(guò)的牙本質(zhì)與復(fù)合樹(shù)脂的粘接強(qiáng)度明顯降低。
[Abstract]:Objective: to study sodium hypochlorite hypochlorite during root canal therapy. Methods: 15 freshly extracted human third molars were selected. The crown was completely free of caries and enamel was removed without dental or pulp treatment. The surface of dentin was ground with 600 mesh sandpaper exposed to middle layer and washed with deionized water for 1 min. The dentin plane specimen was prepared. The specimens were randomly divided into 3 groups. Different surface treatment methods were used to make the bonding specimen: group A (negative control group), the plane dentin specimen treated with deionized water for 20 min; Group B (2. 50%) was treated with Na OCl solution for 20 min, and the fresh solution was replaced once every 5 minutes. Group C: 5.25% Na OCl test group treated with Na OCl solution for 20 min. Fresh solution was changed once every 5 minutes. After treatment, all specimens were bonded with self-etching adhesive SE bond. The top of the sample was plasticized with 5 mm high AP-X composite resin. The adhesive specimens were stored in deionized water at 37 鈩，

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