本文選題：復(fù)合樹脂　切入點(diǎn)：聚合收縮　出處：《濱州醫(yī)學(xué)院》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：目的：復(fù)合樹脂如今已廣泛應(yīng)用于牙體缺損的治療當(dāng)中,然而其光照固化后仍不可避免地產(chǎn)生一定程度的聚合收縮。而這種聚合收縮應(yīng)力有可能會(huì)破壞樹脂和牙的粘結(jié)界面,造成邊緣微滲漏,引起繼發(fā)齲、牙齒術(shù)后敏感等不良后果。因此減少樹脂修復(fù)后微滲漏一直是口腔醫(yī)生關(guān)注的焦點(diǎn)。本實(shí)驗(yàn)分別從復(fù)合樹脂預(yù)處理時(shí)的溫度、復(fù)合樹脂充填形式、是否加入預(yù)聚合樹脂核以及不同光固化模式四個(gè)方面,探討不同處理方法對(duì)牙體缺損治療后邊緣微滲漏的影響,以期找到一種能有效減少樹脂治療后微滲漏的方法,為臨床操作提供理論基礎(chǔ)。方法：實(shí)驗(yàn)一：新鮮拔除36顆上下頜恒磨牙,牙合面?zhèn)銿類洞,隨機(jī)分為3組。A組：常溫下用Z350樹脂充填窩洞；B組：將在Z350樹脂預(yù)熱到60。C后充填窩洞； C組：將Z350樹脂預(yù)冷到4。C后充填窩洞。經(jīng)過500次冷熱水循環(huán)試驗(yàn)后用品紅染色。將牙體縱切成厚度為0.9mm的薄片,使用體視顯微鏡觀測(cè)染料滲透深度。實(shí)驗(yàn)二：新鮮拔除36顆上下頜恒磨牙,牙合面?zhèn)銿類洞,隨機(jī)分為3組。A組：常溫下用Z350樹脂充填窩洞；B組：將在Z350樹脂預(yù)熱到60。C后充填；C組：使用Z350樹脂制作嵌體后修復(fù)窩洞。經(jīng)過500次冷熱水循環(huán)試驗(yàn)后用品紅染色。將牙體縱切成厚度為0.9mm的薄片,使用體視顯微鏡觀測(cè)染料滲透深度。實(shí)驗(yàn)三：新鮮拔除48顆上下頜恒磨牙,牙合面?zhèn)銿類洞,隨機(jī)分為4組。A組：常溫下用Z350樹脂充填窩洞；B組：常溫下充填時(shí)在窩洞中植入預(yù)聚合的復(fù)合樹脂核；C組：將在Z350樹脂預(yù)熱到60。C后充填；D組：將在Z350樹脂預(yù)熱到60C后充填,并將預(yù)聚合的復(fù)合樹脂核置入其中。經(jīng)過500次冷熱水循環(huán)試驗(yàn)后用品紅染色。將牙體縱切成厚度為0.9mm的薄片,使用體視顯微鏡觀測(cè)染料滲透深度。實(shí)驗(yàn)四：新鮮拔除48顆恒磨牙,頰面?zhèn)銿類洞,隨機(jī)分為4組。將3MZ350樹脂預(yù)熱后充填,即刻用不同光固化模式行光照固化：A組：低強(qiáng)度光照組(400 mw/cm2×40 s)；B組：高強(qiáng)度光照組(800 mw／cm2×20 s)；C組：弱光引導(dǎo)組(100mw/cm2×10 s+800 mw/cm2×15 s)；D組：間歇光照組(800 mw/cm2×40 s,2s開,2 s關(guān))。將標(biāo)本進(jìn)行溫度循環(huán),然后經(jīng)品紅溶液染色,使用體視顯微鏡觀察標(biāo)本頰舌向切片充填體邊緣染料滲漏程度。結(jié)果：1.使用不同溫度的復(fù)合樹脂修復(fù)窩洞后的微滲漏兩兩之間均有顯著性差異(P≤0.05)。預(yù)熱組微滲漏明顯小于預(yù)冷組。2.預(yù)熱樹脂組和嵌體組之間微滲漏差別無顯著性,均顯著小于直接充填組(P≤0.05)3.預(yù)熱組和預(yù)熱+樹脂核組的微滲漏明顯小于常溫組和常溫+樹脂核組,差異具有顯著性(P≤0.05)。預(yù)熱組和預(yù)熱+樹脂核組之間差異沒有顯著性(P0.05)。常溫組和常溫+樹脂核組之間差異沒有顯著性(P0.05)。4.高強(qiáng)度光組的微滲漏小于其他三組,差異具有顯著性(P≤0.05),其他三組之間的差異沒有顯著性。結(jié)論：1.溫度對(duì)復(fù)合樹脂修復(fù)后的微滲漏有一定程度的影響,將復(fù)合樹脂預(yù)熱至60C時(shí)充填可減小充填后的微滲漏。將復(fù)合樹脂預(yù)冷至4。C時(shí)會(huì)增加復(fù)合樹脂的充填后的微滲漏。2.使用預(yù)熱樹脂充填和嵌體修復(fù)均可減小V類洞齦壁邊緣微滲漏3.在常溫或預(yù)熱時(shí)加入復(fù)合樹脂核對(duì)修復(fù)后的微滲漏沒有明顯影響。4.復(fù)合樹脂預(yù)熱后,使用低強(qiáng)度光,間歇光照和弱光引導(dǎo)均會(huì)降低修復(fù)后的邊緣封閉性。
[Abstract]:Objective: to treat the composite resin now has been widely used in dental defects, but the light cured still inevitably have a certain degree of polymerization shrinkage. The polymerization shrinkage stress in bonding interface may destroy the resin and teeth, causing microleakage, causing secondary caries, teeth postoperative sensitivity etc. adverse consequences. So to reduce the microleakage of resin is the focus of attention. The doctor has oral and the effects of the composite resin pretreatment temperature, composite resin filling form, whether or not to join the pre polymerization resin core and different light curing modes in four aspects, to investigate the effect of different treatment methods on the treatment of microleakage tooth defect later, in order to find a method can effectively reduce the microleakage of resin after treatment, providing a theoretical basis for the clinical operation. Methods: experiment one: freshly extracted 36 molars. Teeth Surface preparation of V cavity, were randomly divided into 3 groups:.A group under normal temperature with Z350 resin restorations; group B: Z350 to 60.C after preheating in resin restorations; group C: Z350 resin pre cooled to 4.C after restorations. After 500 times of cold and hot water circulation after the test with magenta staining. The tooth was slit into sheet thickness of 0.9mm, using a microscope dye penetration depth. Experiment two: freshly extracted 36 molars. The occlusal surface preparation of class V cavity, were randomly divided into 3 groups:.A group under normal temperature with Z350 resin restorations; group B: in Z350 resin preheating to 60.C after filling; group C: making use of Z350 resin inlay after repairing cavity. After 500 times of cold and hot water circulation test with fuchsin staining. The tooth slit into the thickness of 0.9mm sheet, using a microscope dye penetration depth. Experiment three: freshly extracted 48 molars, occlusal surface preparation V綾繪礊,闅忔満鍒嗕負(fù)4緇，

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