【摘要】：背景:近年來,根管的預(yù)備器械有了很大發(fā)展,不同材料和設(shè)計(jì)構(gòu)造的預(yù)備器械不斷涌現(xiàn),最有代表性的是鎳鈦根管器械。其具有大錐度,超彈性,耐磨性,極佳的柔韌性和超強(qiáng)的記憶性能等優(yōu)點(diǎn),不僅在彎曲根管預(yù)備中可減少偏移和臺(tái)階的形成,而且可明顯提高根管預(yù)備的效率,更易預(yù)備出有利于根管沖洗和充填的形態(tài)。但是,鎳鈦器械也有其無法避免的缺陷,如相比傳統(tǒng)的手動(dòng)不銹鋼器械,鎳鈦器械更容易發(fā)生折斷。目的:本實(shí)驗(yàn)通過研究不同液體沖洗時(shí)鎳鈦器械的預(yù)備根管數(shù)目和根管預(yù)備效率,探尋最有利于提高其根管預(yù)備能力的沖洗方式。方法:實(shí)驗(yàn)用機(jī)用鎳鈦銼PeoTaper Universal(PTU)F1共80根,按照沖洗液不同隨機(jī)分為四組,每組20根,分別為蒸餾水組、生理鹽水組、1%次氯酸鈉組和5%次氯酸鈉組。在模擬彎曲根管的樹脂模塊上以逐步深入法進(jìn)行根管預(yù)備,預(yù)備過程中用沖牙器以不同液體持續(xù)沖洗鎳鈦銼針,記錄預(yù)備每支銼預(yù)備根管數(shù)、提拉總次數(shù)、每個(gè)根管預(yù)備完成所需的提拉次數(shù),比較各組間的差異。結(jié)果:四種不同沖洗條件得出F1銼折斷時(shí)預(yù)備的根管數(shù)(x±s)分別為:蒸餾水組(7.13±3.48)個(gè);生理鹽水組(6.24±1.76)個(gè);1%次氯酸鈉組(6.88±3.20)個(gè);5%次氯酸鈉組(4.31±2.34)個(gè)。統(tǒng)計(jì)結(jié)果顯:5%次氯酸鈉組與其他組均有統(tǒng)計(jì)學(xué)差異(P0.05),其余三組間沒有統(tǒng)計(jì)學(xué)差異;四組預(yù)備根管數(shù)目比較:蒸餾水組≈生理鹽水組≈1 %次氯酸鈉組5%次氯酸鈉組。四種不同沖洗條件得出F1銼折斷時(shí)預(yù)備單個(gè)根管的平均提拉次數(shù)(x±s)分別為:蒸餾水組(17.98±1.70)次;生理鹽水組(17.85±0.73)次;1%次氯酸鈉組(17.47±1.10)次;5%次氯酸鈉組(18.31±1.44)次。通過方差分析得各組間均沒有統(tǒng)計(jì)學(xué)差異(P0.05)。結(jié)論:四種不同液體沖洗條件下,水、生理鹽水、1%次氯酸鈉比5%次氯酸鈉更有利于增加機(jī)用鎳鈦銼的使用次數(shù),但在預(yù)備效率方面結(jié)果相似。綜合考慮經(jīng)濟(jì)、環(huán)保等因素,水是最有利于提高鎳鈦銼根管預(yù)備能力的沖洗液體。
[Abstract]:Background: in recent years, there has been great development in root canal preparation instruments, and various materials and designs have been emerging, the most representative of which is nickel-titanium root canal instruments. It has the advantages of large taper, super elasticity, wear resistance, excellent flexibility and super memory performance. It can not only reduce deviation and step formation in curved root canal preparation, but also improve the efficiency of root canal preparation. It is easier to prepare for the shape of root canal flushing and filling. However, nickel-titanium instruments also have inevitable defects, such as traditional manual stainless steel instruments, nickel-titanium instruments are more likely to break. Objective: to study the number of root canal preparation and root canal preparation efficiency of nickel titanium instruments under different liquid washing conditions, and to find out the most effective way to improve the root canal preparation ability. Methods: 80 PeoTaper Universal (PTU) F1 files were randomly divided into four groups: distilled water group, normal saline group, 1% sodium hypochlorite group and 5% sodium hypochlorite group. In the resin module of simulating curved root canal, the root canal preparation was carried out step by step. During the preparation process, the nickel-titanium file needle was continuously washed with different liquid in the preparation process, and the number of prepared root canals and the total number of times of drawing were recorded. Each root canal was prepared to complete the number of times to pull, compare the differences between the groups. Results: the number of root canals (x 鹵s) prepared when F1 files were broken was (7.13 鹵3.48) in distilled water group, (6.24 鹵1.76) in saline group, (6.88 鹵3.20) in 1% sodium hypochlorite group. 5% sodium hypochlorite group (4.31 鹵2.34). The statistical results showed that there was statistical difference between 5% sodium hypochlorite group and other groups (P0.05), but there was no statistical difference among the other three groups. Comparison of the number of prepared root canals in four groups: distilled water group 鈮，

本文編號(hào)：2410977