Er，Cr：YSGG激光用于根管蕩洗消毒時對牙本質(zhì)力學(xué)性能影響的研究
發(fā)布時間：2018-08-02 10:01
【摘要】：目的本文的目的是探究將鉺鉻釔鋁石榴石晶體(Erbium,Chromium:YttriumScandium-Gallium-Garnet,Er,Cr:YSGG)激光用于根管內(nèi)蕩洗消毒時對牙本質(zhì)的機(jī)械性能—壓縮強(qiáng)度、彈性模量及最大應(yīng)變所產(chǎn)生的影響,并檢測其表面形態(tài)及成分變化,以指導(dǎo)臨床應(yīng)用。對象和方法選擇2015年4月至9月就診于天津醫(yī)科大學(xué)總醫(yī)院口腔科門診的14-18歲女性正畸患者拔除的前磨牙共計60顆,流動水下用牙科打磨機(jī)沿著釉牙骨質(zhì)界(cement-enamel junction,CEJ)垂直于牙體長軸方向?qū)⒐诓恳约案?/3部分去除。然后沿著牙體長軸方向在牙根冠方至牙根中部,切割成接近1mm×2mm×6mm的牙本質(zhì)條,每顆牙齒各制備1個牙本質(zhì)條樣本,并將所有樣本的各個面分別在10000鉬的氧化鋁耐水砂紙上進(jìn)行細(xì)打磨,沖洗擦干,用平頭測厚儀及游標(biāo)卡尺進(jìn)行精確測量,制成標(biāo)準(zhǔn)的長方體樣件。在200倍顯微鏡下觀察,并選擇牙本質(zhì)表面光滑無裂紋的樣本40個,采用隨機(jī)數(shù)字表法將其分成4組,每組各10個樣本,將A組設(shè)置為對照組,B、C、D組設(shè)為實驗組。A組不作處理,B、C、D組分別用1W、2W、3W的水激光照射處理(照射時間30s,距離1mm),然后用掃描電鏡(scanning electron microscope,SEM)觀察其表面形態(tài),采用能譜儀(energy dispersive spectrometer,EDS)分析其成分變化,用萬能試驗機(jī)檢測其彈性模量、壓縮強(qiáng)度及最大應(yīng)變,并描繪各組應(yīng)力-應(yīng)變曲線。本次實驗結(jié)果的相關(guān)數(shù)據(jù)整理及分析應(yīng)用的是SPSS 19.0軟件,計量資料描述用均數(shù)±標(biāo)準(zhǔn)差表示,兩組數(shù)據(jù)之間的對比采用LSD-t檢驗法,多組間數(shù)據(jù)的對比應(yīng)用方差分析,所有統(tǒng)計均采用雙側(cè)檢驗,P0.05認(rèn)為差異具有統(tǒng)計學(xué)意義。結(jié)果1.SEM結(jié)果表明激光處理后的各組牙本質(zhì)試樣表面的玷污層被清潔干凈,牙本質(zhì)小管顯露,呈現(xiàn)出“袖口樣”的形態(tài),且未出現(xiàn)牙本質(zhì)的熔融和開裂。2.EDS檢測結(jié)果表明Er,Cr:YSGG激光會造成牙本質(zhì)表面Ca、P含量的升高。3.未經(jīng)過處理的A組樣本的最大壓縮強(qiáng)度明顯高于經(jīng)過不同輸出能量的水激光處理的B、C、D三組(P0.05),而B、C、D三組之間的差異不具有統(tǒng)計學(xué)意義(P0.05)。4.A、B兩組的彈性模量之間不存在顯著性差異,但B、C、D三組的彈性模量之間具有顯著性差異(P0.05),且B組明顯低于C組,C組明顯低于D組(P0.05)。5.A組的最大應(yīng)變明顯高于B組(P0.05),B組的最大應(yīng)變明顯高于C組(P0.05),同時C組的最大應(yīng)變明顯高于D組(P0.05)。結(jié)論1.Er,Cr:YSGG激光對根管進(jìn)行蕩洗消毒時可以去除玷污層,開放牙本質(zhì)小管,增加牙本質(zhì)表面的鈣磷含量。2.Er,Cr:YSGG激光對根管進(jìn)行蕩洗消毒時會對牙本質(zhì)的最大壓強(qiáng)、彈性模量及最大應(yīng)變產(chǎn)生影響。3.水激光能量為1W時對牙本質(zhì)造成的損傷小于2W及3W輸出能量的水激光。
[Abstract]:Objective the purpose of this paper is to investigate the effects of Erbium Chromium: Yttrium Scandium-Gallium-Garnetum Erncr-Cr: YSGG laser on the mechanical properties of dentin, compression strength, modulus of elasticity and maximum strain of dentin. The changes of surface morphology and composition were detected to guide clinical application. Participants and methods A total of 60 premolars were extracted from female orthodontic patients aged 14-18 years from April to September 2015 in the Department of Stomatology, General Hospital of Tianjin Medical University. A mobile underwater dental grinder is used to remove the crown and a third of the root tip perpendicular to the long axis of the tooth along the cement-enamel junction. Then along the direction of the long axis of the tooth, from the root crown to the middle of the root, it was cut into a dentin bar close to 1mm 脳 2mm 脳 6mm. Each tooth prepared a sample of the dentin strip. Each surface of all the samples was carefully polished on 10000 molybdenum alumina waterproof sand paper, washed and wiped, and accurately measured with a flat-head thickness gauge and a Vernier caliper. A standard cuboid sample was made. Under 200 times microscope, 40 samples with smooth and free dentin surface were selected and divided into 4 groups with 10 samples in each group by random digit table method. Group A was set up as control group. Group A was treated with water laser irradiation (irradiation time 30s, distance 1mm) respectively. Group A was treated with water laser irradiation (30 s, distance 1mm) without treatment, then the surface morphology was observed by scanning electron microscope (SEM). The component changes were analyzed by (energy dispersive spectrometer. The elastic modulus, compressive strength and maximum strain were measured by universal testing machine, and the stress-strain curves of each group were described. SPSS 19.0 software is used to collate and analyze the related data of this experiment. The description of measurement data is expressed as mean 鹵standard deviation. The comparison between the two groups of data adopts LSD-t test method, and the analysis of variance is applied to the comparison of multi-group data. All statistics were bilateral test P 0.05 that the difference was statistically significant. Results 1.SEM results showed that the smear layer on the surface of each group of dentin samples was clean and clean, and the dentine tubules were exposed, showing the shape of cuff. There was no melting and cracking of dentin. 2. The results of EDS showed that Ernst Cr: YSGG laser could increase the content of CaOP on dentin surface. The maximum compressive strength of group A was significantly higher than that of group D treated with water laser with different output energy (P0.05), but there was no significant difference between the three groups (P0.05). 4. There was no significant difference in elastic modulus between the two groups. However, there was significant difference in elastic modulus among the three groups (P0.05), and the maximum strain of group B was significantly lower than that of group C (P0.05). 5.The maximum strain of group A was significantly higher than that of group B (P0.05), and the maximum strain of group C was significantly higher than that of group C (P0.05), and the maximum strain of group C was significantly higher than that of group C (P0.05). The strain of group D was significantly higher than that of group D (P0.05). Conclusions 1. When root canal was disinfected by Ernst Cr: YSGG laser, the smear layer was removed, the dentine tubules were opened, and the calcium and phosphorus content on the dentin surface was increased. 2. The maximum pressure of the root canal could be increased when the root canal was disinfected by Ernst Cr: YSGG laser. Elastic modulus and maximum strain. When the energy of water laser is 1 W, the damage to dentin is less than 2 W and 3 W.
【學(xué)位授予單位】：天津醫(yī)科大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：R781.05
[Abstract]:Objective the purpose of this paper is to investigate the effects of Erbium Chromium: Yttrium Scandium-Gallium-Garnetum Erncr-Cr: YSGG laser on the mechanical properties of dentin, compression strength, modulus of elasticity and maximum strain of dentin. The changes of surface morphology and composition were detected to guide clinical application. Participants and methods A total of 60 premolars were extracted from female orthodontic patients aged 14-18 years from April to September 2015 in the Department of Stomatology, General Hospital of Tianjin Medical University. A mobile underwater dental grinder is used to remove the crown and a third of the root tip perpendicular to the long axis of the tooth along the cement-enamel junction. Then along the direction of the long axis of the tooth, from the root crown to the middle of the root, it was cut into a dentin bar close to 1mm 脳 2mm 脳 6mm. Each tooth prepared a sample of the dentin strip. Each surface of all the samples was carefully polished on 10000 molybdenum alumina waterproof sand paper, washed and wiped, and accurately measured with a flat-head thickness gauge and a Vernier caliper. A standard cuboid sample was made. Under 200 times microscope, 40 samples with smooth and free dentin surface were selected and divided into 4 groups with 10 samples in each group by random digit table method. Group A was set up as control group. Group A was treated with water laser irradiation (irradiation time 30s, distance 1mm) respectively. Group A was treated with water laser irradiation (30 s, distance 1mm) without treatment, then the surface morphology was observed by scanning electron microscope (SEM). The component changes were analyzed by (energy dispersive spectrometer. The elastic modulus, compressive strength and maximum strain were measured by universal testing machine, and the stress-strain curves of each group were described. SPSS 19.0 software is used to collate and analyze the related data of this experiment. The description of measurement data is expressed as mean 鹵standard deviation. The comparison between the two groups of data adopts LSD-t test method, and the analysis of variance is applied to the comparison of multi-group data. All statistics were bilateral test P 0.05 that the difference was statistically significant. Results 1.SEM results showed that the smear layer on the surface of each group of dentin samples was clean and clean, and the dentine tubules were exposed, showing the shape of cuff. There was no melting and cracking of dentin. 2. The results of EDS showed that Ernst Cr: YSGG laser could increase the content of CaOP on dentin surface. The maximum compressive strength of group A was significantly higher than that of group D treated with water laser with different output energy (P0.05), but there was no significant difference between the three groups (P0.05). 4. There was no significant difference in elastic modulus between the two groups. However, there was significant difference in elastic modulus among the three groups (P0.05), and the maximum strain of group B was significantly lower than that of group C (P0.05). 5.The maximum strain of group A was significantly higher than that of group B (P0.05), and the maximum strain of group C was significantly higher than that of group C (P0.05), and the maximum strain of group C was significantly higher than that of group C (P0.05). The strain of group D was significantly higher than that of group D (P0.05). Conclusions 1. When root canal was disinfected by Ernst Cr: YSGG laser, the smear layer was removed, the dentine tubules were opened, and the calcium and phosphorus content on the dentin surface was increased. 2. The maximum pressure of the root canal could be increased when the root canal was disinfected by Ernst Cr: YSGG laser. Elastic modulus and maximum strain. When the energy of water laser is 1 W, the damage to dentin is less than 2 W and 3 W.
【學(xué)位授予單位】：天津醫(yī)科大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：R781.05
【參考文獻(xiàn)】
相關(guān)期刊論文 前9條
1 徐官寶;鄭靖;;牙本質(zhì)層對人牙力學(xué)性能的影響[J];潤滑與密封;2016年01期
2 凌均h，
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