鄧敏 陳海波 何鋼清 李佳俞

【摘要】?目的?探討Er,Cr:YSGG激光預處理樁道牙本質表面對其與纖維樁粘接強度的影響,為臨床選擇合適的根管表面處理方法提供實驗依據。方法?選用45顆因正畸拔除的健康下頜單根管前磨牙經根管治療、樁道預備后隨機分為三個組,每組15顆。使用不同方法對樁道牙本質壁進行處理,Ⅰ組(對照組):常規單純酸蝕表面處理組;Ⅱ組:Er,Cr:YSGG激光表面處理組;Ⅲ組:Er,Cr:YSGG激光聯合酸蝕處理組。分別用樹脂水門汀將纖維樁粘接于根管樁道內,用力學試驗機以1 mm/min速度牽拉纖維樁,記錄纖維樁與牙根脫離時的最大載荷,并進行統計學分析。結果?三種不同處理方法對樁道牙本質粘接強度的影響差異有統計學意義(P<0.001),Ⅱ組的粘接強度顯著高于Ⅰ組和Ⅲ組,差異有統計學意義(P<0.001)。
結論?Er,Cr:YSGG激光預處理技術的應用能提高根管牙本質的粘接強度。
【關鍵詞】?Er,Cr:YSGG激光;樁道;纖維樁;粘接強度
中圖分類號:R783.1?文獻標志碼:A?DOI:10.3969/j.issn.1003-1383.2019.03.005
【Abstract】?Objective?To study Er,Cr:YSGG laser pretreatments for the surface of post space dentin and its effect on bonding strength between fiber post and dentin.Methods?After root canal therapy and post space preparation,45 healthy extracted mandible premolar teeth with single root canal were randomly divided into three groups,with 15 teeth in each group.Different methods were used to treat the dentin wall of post space—Group Ⅰ(control group) were given conventional acid etching surface treatment,GroupⅡwere given Er,Cr:YSGG laser surface treatment,and Group Ⅲ were given Er,Cr:YSGG laser combined with acid etching treatment.Fiber posts were cemented in root canal with resin cement,and then fiber posts were pulled by mechanical testing machine at 1 mm/min speed.And then,maximum load when the fiber post detached from tooth root was recorded,and statistical analysis was carried out.Results?There was statistically significant difference in the effects of the three different processing methods on bonding strength of post space dentin(P<0.001),and the bonding strength of the GroupⅡwas higher than that of the Group Ⅰ and Group Ⅲ,difference was statistically significant(P<0.001).
Conclusion?Er,Cr:YSGG laser pretreatment technique can increase the bonding strength of post space dentin.
【Key words】?Er,Cr:YSGG laser;post space;fiber post;bonding strength
隨著美容修復需求的日益增長以及現代保存牙科學的發展,纖維樁逐漸取代傳統的金屬樁。纖維樁能否與根管獲得牢固的粘接是關系到修復成功與否的關鍵。研究發現[1~2],纖維樁粘接失敗主要發生在牙本質-粘接劑界面。因此,尋找有效方法對根管壁牙本質的表面進行處理,加強粘接劑與根管壁間的粘接效果,從而提高纖維樁的最終粘接強度具有非常重要的意義。自激光問世以來,Er,Cr:YSGG激光在粘接前預處理中的應用發展迅速。但是Er,Cr:YSGG激光預處理根管壁表面對其與纖維樁的粘接強度影響的研究目前較少報道。本研究旨在探討應用Er,Cr:YSGG激光預處理對根管牙本質粘接強度的影響,為臨床選擇合適的根管表面處理方法提供實驗依據。
1?資料與方法
1.1?材料與儀器
Er,Cr:YSGG Waterlaser(Biolase,美國);Aestheti-Plus玻璃纖維樁(美國BISCO公司)、Zwick/Z萬能材料試驗機(德國Zwick公司),全酸蝕型粘接樹脂(美國BISCO公司),根管封閉劑AH-?Plus Sealer(Dentsply,德國)。