Er，Cr：YSGG激光用于根管荡洗消毒时对牙本质力学性能影响的研究
发布时间：2018-08-02 10:01
【摘要】：目的本文的目的是探究将铒铬钇铝石榴石晶体(Erbium,Chromium:YttriumScandium-Gallium-Garnet,Er,Cr:YSGG)激光用于根管内荡洗消毒时对牙本质的机械性能—压缩强度、弹性模量及最大应变所产生的影响,并检测其表面形态及成分变化,以指导临床应用。对象和方法选择2015年4月至9月就诊于天津医科大学总医院口腔科门诊的14-18岁女性正畸患者拔除的前磨牙共计60颗,流动水下用牙科打磨机沿着釉牙骨质界(cement-enamel junction,CEJ)垂直于牙体长轴方向将冠部以及根尖1/3部分去除。然后沿着牙体长轴方向在牙根冠方至牙根中部,切割成接近1mm×2mm×6mm的牙本质条,每颗牙齿各制备1个牙本质条样本,并将所有样本的各个面分别在10000钼的氧化铝耐水砂纸上进行细打磨,冲洗擦干,用平头测厚仪及游标卡尺进行精确测量,制成标准的长方体样件。在200倍显微镜下观察,并选择牙本质表面光滑无裂纹的样本40个,采用随机数字表法将其分成4组,每组各10个样本,将A组设置为对照组,B、C、D组设为实验组。A组不作处理,B、C、D组分别用1W、2W、3W的水激光照射处理(照射时间30s,距离1mm),然后用扫描电镜(scanning electron microscope,SEM)观察其表面形态,采用能谱仪(energy dispersive spectrometer,EDS)分析其成分变化,用万能试验机检测其弹性模量、压缩强度及最大应变,并描绘各组应力-应变曲线。本次实验结果的相关数据整理及分析应用的是SPSS 19.0软件,计量资料描述用均数±标准差表示,两组数据之间的对比采用LSD-t检验法,多组间数据的对比应用方差分析,所有统计均采用双侧检验,P0.05认为差异具有统计学意义。结果1.SEM结果表明激光处理后的各组牙本质试样表面的玷污层被清洁干净,牙本质小管显露,呈现出“袖口样”的形态,且未出现牙本质的熔融和开裂。2.EDS检测结果表明Er,Cr:YSGG激光会造成牙本质表面Ca、P含量的升高。3.未经过处理的A组样本的最大压缩强度明显高于经过不同输出能量的水激光处理的B、C、D三组(P0.05),而B、C、D三组之间的差异不具有统计学意义(P0.05)。4.A、B两组的弹性模量之间不存在显著性差异,但B、C、D三组的弹性模量之间具有显著性差异(P0.05),且B组明显低于C组,C组明显低于D组(P0.05)。5.A组的最大应变明显高于B组(P0.05),B组的最大应变明显高于C组(P0.05),同时C组的最大应变明显高于D组(P0.05)。结论1.Er,Cr:YSGG激光对根管进行荡洗消毒时可以去除玷污层,开放牙本质小管,增加牙本质表面的钙磷含量。2.Er,Cr:YSGG激光对根管进行荡洗消毒时会对牙本质的最大压强、弹性模量及最大应变产生影响。3.水激光能量为1W时对牙本质造成的损伤小于2W及3W输出能量的水激光。
[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 卤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.
【学位授予单位】：天津医科大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：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 卤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.
【学位授予单位】：天津医科大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：R781.05
【参考文献】
相关期刊论文 前9条
1 徐官宝;郑靖;;牙本质层对人牙力学性能的影响[J];润滑与密封;2016年01期
2 凌均h，
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