绚彩复合体治疗儿童乳牙龋的临床研究

目的研究新型绚彩复合体Twinky Star对儿童乳牙龋病的临床治疗情况。方法根据患儿对充填材料的选择意愿进行分组：试验组568名乳牙龋齿患儿采用绚彩复合体Twinky Star充填,对照组814名乳牙龋齿患儿采用Filtek Z250树脂充填,调查2组患儿的就诊行为表现以及半年后患牙充填物脱落率、继发龋发生率及牙髓活力。结果试验组充填治疗的接受率为55.28%,对照组充填治疗接受率为47.05%,差异有统计学意义（χ2=9.07,P=0.00）。试验组568名患儿中,392名于半年后复诊,充填物脱落的有7名,占回访人数的1.79%;2名为充填物边缘封闭不良,有继发龋产生,占回访人数的0.51%。对照组814名患儿中,556名于半年后复诊,充填物脱落的有2名,占回访人数的0.36%;发生继发龋的有4名,占回访人数的0.72%;有牙髓症状的患者有1名。结论新型绚彩复合体易于被患儿接受,临床治疗效果好,可以进一步在临床上推广使用。     

Effect of water storage on fluoride release and mechanical properties of a polyacid-modified composite resin （compomer）

We evaluated the effect of water storage on fluoride release and mechanical properties of compomer restorative material.Fluoride release was recorded using a specific fluoride electrode.Flexural properties and fracture toughness were measured using a universal testing machine.Vickers hardness was measured using a micro-hardness tester.There was initial burst of fluoride release up to 1 w,which was diminished to a low level in 1 mon and remained relatively constant over 6 mon.Flexural strength and hardness w...     

Dyract复合体与光固化复合树脂修复楔状缺损的临床对照研究

目的 :比较复合体与光固化复合树脂两种材料修复楔状缺损的临床效果。方法 :在同一个体上选择条件基本相同的楔状缺损患牙 ,共 1 97例 394颗 ,分别采用Dyract复合体和光固化复合树脂充填修复 ,随访观察 1 8～ 2 4月 ,并对其疗效进行比较。结果 :Dyract复合体组总成功率为 92 .39% ,高于光固化复合树脂组 (P <0 .0 5 ) ;前者的修复体脱落率为 3.5 5 % ,牙髓活力改变率为 0 .5 0 % ,均低于后者 (P <0 .0 5 ) ;前者的修复体边缘不密合、变色率为 3.0 5 % ,继发龋发生率为 0 .5 1 % ,尽管也低于后者 ,但没有显著性差异 (P >0 .0 5 )。结论 :Dyract复合体粘结性强 ,对牙髓刺激性小 ,是修复楔状缺损较为理想的材料     

AP复合体修复前牙切角缺损的临床研究

目的比较两种粘结剂对AP复合体直接修复前牙切角缺损时固位情况,为临床工作提供参考。方法随机选择前牙切角缺损患者53名,计患牙80颗,分为A、B两组。A组采用Prime&BondNTTM,B组采用自酸蚀粘结剂AdperTMPromptTM,两组均用AP复合体直接修复,术后3月、6月、1年复诊,观察充填物的留存情况。结果术后3月,A、B两组脱落率分别为7·5%、5·0%,差异无统计学意义(p>0·05);术后6月,A、B两组脱落率分别为17·5%、12·5%,差异无统计学意义(p>0·05);术后1年,A、B两组脱落率分别为27·5%、17·5%,A组充填物脱落率高于B组,差异有统计学意义(p<0·05)。结论AP复合体修复前牙切角缺损具有一定疗效,采用自酸蚀粘结剂有助于提高AP复合体直接修复前牙切角缺损时的固位力。     

CGF-1型复合体抑龋能力的研究

目的 :评价CGF - 1型复合体的抑龋能力。方法 :新拔除的磨牙 40个 ,于釉牙骨质交界处制洞(4mm× 2mm× 1.5mm) ,分别用CGF - 1型复合体、Dyract复合体、FujiⅠ玻璃离子、Durafill复合树脂充填 ,致龋酸胶(pH =4)中浸泡 2 1d后 ,偏光镜下观察充填材料周围类龋损的形成情况。结果 :充填体周围类龋损呈矩形 ,呈正双折射改变 ,CGF - 1型复合体周围类龋损在釉质和牙本质 -牙骨质的平均深度大于FujiⅠ玻璃离子和Dyract复合体 ,但较Durafill复合树脂小。结论 :CGF - 1型复合体具有一定的抑龋能力但较FujiⅠ玻璃离子和Dyract复合体弱。     

免冲洗酸蚀复合体窝沟封闭系统的实验研究

目的比较免冲洗酸蚀复合体窝沟封闭系统和传统磷酸酸蚀窝沟封闭系统在恒牙应用时的封闭和微渗漏情况。方法16颗新鲜拔除的第三磨牙分成4组。Ⅰ组应用免冲洗酸、粘接剂Prime & bond NT和复合体窝沟封闭系统,Ⅱ组采用磷酸和Resin树脂窝沟封闭系统,Ⅲ组采用磷酸和复合体窝沟封闭剂,Ⅳ组采用免冲洗酸、粘接剂Prime & bond NT和Resin树脂窝沟封闭剂。应用硝酸银浸染法和实体显微镜检查微渗漏情况,扫描电镜观察窝沟封闭情况。结果4组牙齿都存在微渗漏。Ⅰ、Ⅳ组微渗漏比率均高于Ⅱ组（ P<0.01）;Ⅰ组和Ⅳ组、Ⅱ组和Ⅲ组的微渗漏比率也有统计学差异（ P<0.01）,Ⅰ组高于Ⅳ组,Ⅲ组高于Ⅱ组。扫描电镜观察发现采用磷酸酸蚀组可见树脂突,材料均匀;采用免冲洗酸蚀组基本上未见树脂突,材料之间裂隙大。多数样本的窝沟底部渗透较差。结论免冲洗酸蚀系统的微渗漏高于磷酸酸蚀系统,复合体封闭剂的微渗漏较高;磷酸酸蚀法有利于提高窝沟封闭剂的固位。     

Longevity of a resin-modified glass ionomer cement and a polyacid-modified resin composite restoring non-carious cervical lesions in a general dental practice

BACKGROUND: Long-term prospective survival studies of resin-modified glass ionomer cements (RMGICs) and polyacid-modified resin composites (compomers) placed in non-carious cervical lesions (NCCLs) are lacking from general dental practice. Short-term studies have shown an unsatisfactory clinical performance for several materials. METHODS: One practitioner placed 87 compomer (Compoglass, Vivadent-Ivoclar) and 73 encapsulated RMGIC (Fuji II LC, GC Int.) restorations in NCCLs for 61 adults. Compoglass was placed using SCA primer, and Fuji II LC using GC Dentin Conditioner. No cavity preparation was undertaken. The Kaplan-Meier method was used for estimating the cumulative survivals for those restorations that were replaced, with the probability level set at alpha = 0.05 for statistical significance. RESULTS: Restorations were judged unsatisfactory (by the practitioner and the subjects) because of surface and marginal loss of material (68.8 per cent), dislodgement (18.8 per cent) and discoloration (12.4 per cent), these modes being similar for both materials (P = 0.35). Unsatisfactory restorations were replaced in 121 (75.6 per cent) instances. After periods of up to five years, cumulative survival estimates were 14.9 (5.8 Standard Error) per cent for Compoglass and zero per cent for Fuji II LC (P = 0.74). Median survivals were 30 months for Compoglass and 42 months for Fuji II LC. CONCLUSION: Both materials had high long-term unsatisfactory performances when placed in non-prepared NCCLs in a general dental practice.     

Dyract与光固化复合树脂即刻修复冠折露髓年轻恒前牙的临床观察

[目的]比较Dyract与光固化复合树脂即刻修复冠折露髓年轻恒前牙的临床疗效。[方法]60颗冠折露髓患牙随机分成两组，一组（30颗牙）采用Dyract复合体修复，另一组（30颗牙）采用光固化复合树脂修复。[结果]经过1～2年追踪观察，Dyract组成功率93．3％，复合树组成功率73．3％，治疗组与对照组比较差异有显著性（P〈0．05）。[结论]Dyract复合体粘结性强，对牙髓刺激性小，是修复冠折露髓年轻恒前牙的理想材料。     

460颗后牙凹坑状磨耗缺损的治疗分析

目的：对460颗后牙凹坑状磨牙缺损的牙齿进行相应方法的治疗,来探索老年人口腔磨耗牙的治疗方法。方法：对460颗后牙凹坑状磨耗缺损,采取2次方法进行充填治疗。首先采取脱敏剂脱敏,多次少许磨除牙体组织,适当备洞。较深窝洞,用光固化氢氧化钙盖髓,ZOE暂封。第二次复诊,去除暂封物,用复合体或聚合体垫底,3ME250光固化复合树脂充填,调殆抛光,表面涂光固化粘结剂光照20s。结果：通过上述治疗半年一2年半的观察,460颗后牙凹坑状磨耗缺损的患牙充填物完好,423颗症状消失或减轻。有效率达90．21％。结论：脱敏剂＋复合体或聚合体垫底＋3ME250复合树脂充填术治疗后牙凹坑状磨耗缺损是临床上一种较好方法。在实际工作中,我们应根据患者具体情况采取相应的治疗措施,从而达到保留患牙的目的。     

Dentine bond strength and microleakage of flowable composite,compomer and glass ionomer cement

Background: To assess in vitro the dentine bond strength and microleakage of three Class V restorations viz. flowable composite, compomer and glass ionomer cement. Methods: Eighteen dentine specimens were prepared and randomly distributed among three groups. Three kinds of restoration materials were each bonded on prepared dentine surfaces in three groups as per the manufacturers’ instructions. Group Aelite: Tyrian SPE (a no‐rinse, self‐priming etchant) + One Step Plus (an universal dental adhesive) + Aeliteflo (a flowable composite); Group Dyract: Prime & Bond NT (a no‐rinse, self‐priming dental adhesive) + Dyract AP (a compomer); Group GlasIonomer: GlasIonomer Type II (a self‐cured restorative glass ionomer). Fifteen dentine/restoration microtensile bond test specimens were prepared from each group and were subjected to microtensile bond strength testing. The bond interfaces were observed morphologically using a scanning electron microscope (SEM). Twenty‐four cervical cavities of 4.0 mm mesiodistal length, 2.0 mm occlusogingival height and 1.5 mm depth were prepared at the cemento‐enamel junction (CEJ) on both buccal and lingual surfaces of each tooth. The cavities were each filled with flowable composite (Group Aelite), compomer (Group Dyract) and glass ionomer cement (Group GlasIonomer) using the same material and methods as for the microtensile bond tests. Microleakage of each restoration was evaluated by the ratio of the length of methylene blue penetration along the tooth‐restoration interface and the total length of the dentine cavity wall on the cut surface. Results: One‐way ANOVA and least significant difference (LSD) tests revealed statistically significant differences among the dentine bond strength for Group Aelite (28.4 MPa), Group Dyract (15.1 MPa) and Group GlasIonomer (2.5 MPa). SEM images showed intimate adaptation in the restoration/dentine interfaces of Group Aelite and Group Dyract. All of the systems tested in this study presented microleakage. However, both Group Aelite (0.808) and Group Dyract (0.863) had significantly less microleakage than Group GlasIonomer (0.964). There were no statistically significant microleakage differences between Group Aelite and Group Dyract, and no statistically significant microleakage differences between the occlusal margin and gingival margin. Conclusions: None of the systems tested in this study completely eliminated microleakage. However, both the flowable composite and compomer provided stronger dentine bond strengths and better margin sealing than the conventional glass ionomer cement. Occlusal forces exerted the same effects on microleakage of the occlusal margin and gingival margin in cervical cavities.