本文關(guān)鍵詞： 托槽再利用 處理方式 剪切強(qiáng)度 摩擦力 掃描電鏡　出處：《青島大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：目的 探究不同處理方式對脫落托槽回收再利用后的粘結(jié)強(qiáng)度及摩擦力的影響。 方法 選擇臨床上因正畸而拔除的健康雙尖牙70顆,其中30顆用于脫落托槽的制備。將脫落托槽依據(jù)不同的回收方法,隨機(jī)均分為3組：半導(dǎo)體激光組、噴砂組、燒結(jié)組,同時(shí)以10顆新托槽作為對照組。在托槽再粘結(jié)前,以掃描電鏡觀察托槽底板表面形貌及托槽槽溝光潔度變化。后將四組托槽粘結(jié)在余下的40顆牙齒上,首先進(jìn)行抗剪切強(qiáng)度的測試并統(tǒng)計(jì)牙面粘結(jié)劑殘留指數(shù),其次測定與0.019x0.025英寸的不銹鋼方絲組合時(shí)的靜動(dòng)摩擦力。 結(jié)果 1、新托槽組平均抗剪切強(qiáng)度最強(qiáng)(14.27Mpa±4.57),其次為噴砂組(13.36Mpa± 3.45),再次為激光組(11.38Mpa±2.81)及燒結(jié)組(10.65Mpa±4.24),四組間抗剪切強(qiáng)度無統(tǒng)計(jì)學(xué)差異(P0.05)。四組間粘結(jié)劑殘留指數(shù)亦無統(tǒng)計(jì)學(xué)差異(P0.05)。 2、四組間靜動(dòng)摩擦力均無統(tǒng)計(jì)學(xué)差異(P0.05)。 3、托槽底板的掃描電鏡觀察：與網(wǎng)格清晰干凈的新托槽相比,噴砂組托槽底板表面無粘結(jié)劑殘留,但粗糙度明顯增加；而激光組在網(wǎng)格間稍有雜質(zhì)殘存且托槽底板稍顯粗糙；燒結(jié)組托槽底板網(wǎng)格間多有粘結(jié)劑殘存。 4、.托槽槽溝的掃描電鏡觀察：新托槽槽溝可見不規(guī)則形狀的突起,且在槽溝內(nèi)分布均勻；噴砂組托槽槽溝可見多處團(tuán)狀堆積的小顆粒；燒結(jié)組槽溝內(nèi)不規(guī)則突起較新托槽組明顯；半導(dǎo)體激光組槽溝內(nèi)不規(guī)則突起與新托槽比差異較小。 結(jié)論 三種不同的處理方式即半導(dǎo)體激光法、噴砂法、燒結(jié)法進(jìn)行托槽回收再利用后,其粘結(jié)強(qiáng)度均可滿足臨床需要且經(jīng)三種處理方式處理后的托槽再利用的摩擦力,與新托槽比,未發(fā)生顯著性的改變。
[Abstract]:Purpose. The effects of different treatment methods on bond strength and friction force after recovery and reuse of shed brackets were investigated. Method. 70 healthy bicuspid teeth were extracted from orthodontics and 30 of them were used in the preparation of abscission brackets. According to different recovery methods, the abscission brackets were randomly divided into three groups: semiconductor laser group, sand blasting group, sintering group, and so on. At the same time, 10 new brackets were used as the control group. Before the bracket was rebonded, the surface morphology of the bracket bottom plate and the cleavage of the bracket groove were observed by scanning electron microscope. Then the four groups of brackets were bonded to the remaining 40 teeth. First, the shear strength was tested and the residual index of the binder was calculated. Secondly, the static and dynamic friction force was measured when combined with 0.019x0.025 inch stainless steel square wire. Results. 1. The average shear strength of the new bracket group was the strongest (14.27Mpa 鹵4.57), followed by the sand blasting group (13.36Mpa 鹵). 3.45m, 11.38Mpa 鹵2.81in laser group and 10.65Mpa 鹵4.24m in sintering group. There was no significant difference in shear strength among the four groups (P 0.05), and there was no significant difference in residual index of binder between the four groups (P 0.05). There was no statistical difference in static and dynamic friction force between the four groups (P 0.05). (3) SEM observation of bracket bottom plate: compared with the new bracket with clear and clean mesh, the sand blasting group had no residual binder on the bottom plate, but the roughness was obviously increased, while the laser group had some impurities remaining between the meshes and the bracket bottom was slightly rough. There are binder residues between the mesh of the bottom plate of the sintered bracket. (4) SEM observation of bracket groove: irregular protuberance was observed in the new bracket groove and distributed evenly in the trench, and there were many clusters of small particles in the grooves of sandblasting group. The irregular protrusions in the grooves in the sintered group were more obvious than those in the new bracket group, and the difference between the irregular protrusions in the grooves and the new brackets in the semiconductor laser group was smaller. Conclusion. Three different treatment methods, semiconductor laser method, sand blasting method and sintering method for recovery and reuse of brackets, the bond strength of the brackets can meet the clinical needs and the friction force of the brackets reused by the three treatment methods can be compared with that of the new brackets. No significant changes occurred.
【學(xué)位授予單位】：青島大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：R783.5

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