本文選題：根管充填材料 + 導(dǎo)熱性　； 參考：《北京大學(xué)學(xué)報(醫(yī)學(xué)版)》2017年01期

【摘要】：目的:研究不同牙膠類根管充填材料的導(dǎo)熱性及其對根尖封閉的影響。方法:采用差重法分別測量BP、DP、DPP和VP這4種牙膠類根管充填材料的成分,并使用導(dǎo)熱系數(shù)測定儀測量其導(dǎo)熱系數(shù),每種牙膠隨機選取20支,其中10支使用System B(200℃)距尖端4 mm無壓力加熱,使用紅外熱成像儀實時記錄牙膠尖的溫度變化;另10支用透明根管模型進行熱牙膠根管充填,24 h后在體視顯微鏡(×40)下觀察距加熱端1 mm外和3 mm處的牙膠充填面積比例,使用單因素方差分析(one-way ANOVA)進行比較。結(jié)果:DP中無機填料比例(80.90%±1.14%)及導(dǎo)熱系數(shù)(2.247±0.002)均顯著高于BP(79.28%±3.88%;1.179±0.003)、DPP(68.46%±5.09%;0.604±0.001)和VP(78.86%±1.87%;1.150±0.001)(P0.05)。在200℃下無壓力加熱牙膠尖,DP可在1 mm外達到65℃,而BP、DPP、VP僅能在加熱端1 mm內(nèi)測得65℃。熱牙膠垂直加壓充填后,3組的牙膠充填面積比均有提高,距工作長度3 mm(WL-3)處DP的牙膠充填面積比(96.89%±0.03%)高于BP(95.47%±0.06%)、DPP(95.21%±0.03%)和VP(95.15%±0.03%),差異有統(tǒng)計學(xué)意義(P0.05)。結(jié)論:4種牙膠類根管充填材料中,DP無機填料多,其導(dǎo)熱性好,WL-3處根尖封閉性優(yōu)于其他種類牙膠。
[Abstract]:Objective: to study the thermal conductivity of different gum root canal filling materials and its effect on apical sealing. Methods: DPP and VP were measured by differential weight method, and the thermal conductivity was measured by means of thermal conductivity analyzer. 20 teeth were randomly selected for each kind of gum. Ten of them were heated without pressure with System BX 200 鈩，

本文編號：1820322