烤瓷冠颈缘密合度和位置对牙周健康的影响

目的探讨烤瓷冠颈缘密合度和位置对冠桥基牙牙周组织健康的影响。方法收集已接受烤瓷冠桥修复的患者46例,共63颗基牙,按冠颈缘处是否卡探针分为颈缘密合组和颈缘不密合组,又按冠颈缘位置分为龈上组、齐龈组和龈下组。检查各基牙的菌斑指数、龈沟出血指数及探针深度,并进行统计学分析。结果颈缘不密合组烤瓷冠基牙的龈沟出血指数高于颈缘密合组(P<0.05),龈下组高于龈上组和齐龈组(P<0.05)。结论为了基牙牙周组织健康,烤瓷冠的颈缘应尽可能密合,且边缘不宜做在龈下。     

金属烤瓷修复体瓷层断裂后光固化复合树脂修复的密合度

目的：测试金属烤瓷修复体瓷层断裂后光固化复合树脂修复的密合度,观察有机硅烷偶剂对密合度的影响。方法：三种试样粘结表面（烤瓷面、金属基底瓷剥脱面、金属基底研磨面）各分为有偶联剂组和无偶联剂组两大组,分别与6种光固化复合树脂粘结后测试粘结界面的缝隙。结果：树脂与烤瓷面间缝隙为0．62－2．65μm,与金属基底瓷剥脱面间缝隙为1．61－3．79μm,二者在有偶联剂组显著小于无偶联剂组。树脂与金属基底研磨面间缝隙为4．67－9．23μm,有偶联剂组和无偶联剂组间差异无显著性。结论：树脂与烤瓷面及金属基底瓷剥脱面间缝隙较小,使用偶联剂可减小界面的缝隙。树脂与金属基底研磨面间缝隙较大,使用偶联剂对该界面的缝隙无明显影响。     

两种不同印模技术对种植冠桥修复体边缘密合度的影响

目的 探讨两种不同印模技术对种植冠桥修复体边缘密合度的影响.方法 选取已植入2～3枚种植体并需行固定桥联冠修复的患者122例,对照组采用数字化印模,观察组采用合金夹板印模.比较两组修复体情况、修复体边缘密合度、被修复牙牙龈指数、患者满意程度.结果 观察组修复体过长或过短、早接触发生率显著低于对照组,有悬突、过松或过紧发...     

边缘精密修整法对烤瓷冠桥边缘密合度影响研究

目的:探讨边缘精密修整法对烤瓷冠边缘密合度影响。方法:收集各种原因拔除且牙冠完整的离体牙92颗,制作单冠修复模型,随机分成精密组和传统组,精密组在医用放大镜下完成修复体的制作过程,传统组按照常规修复体制作过程完成。分别采用探针检查法和10倍牙科实体显微镜检查修复体边缘密合度。结果:利用探针法对两组模型进行检查,精密组探针平均深度为(1.36±0.42)mm,低于传统组的(1.44±0.57)mm,但差异无统计学意义,利用10倍牙科实体显微镜进行观察时,精密组边缘密合度为(32.41±5.82)μm显著少于传统组的(43.72±6.46)μm,差异具有统计学意义(P<0.05)。结论:边缘精密修整法应用于义齿修复体制作过程中,不仅操作简单,而且可极大提高修复体边缘密合程度,减少修复后并发症的发生,有助于提高修复效果。     

全冠修复体边缘密合度的数字化辅助评价方法

目的基于三维扫描和迭代最近点配准(iterative closest point,ICP)技术的定量评价全冠修复体在模型上边缘绝对密合度的数字化辅助方法。方法用牙颌模型三维扫描仪分别获得预备体代型和全冠修复体的三维数据,利用迭代最近点配准技术实现"虚拟就位",在逆向工程软件中,利用锐化边缘等功能模块提取代型和修复体的边缘线,最后通过基于观测长轴的环切功能模块得到二维截面上全冠边缘点和代型边缘线点之间的直线距离,获得全冠边缘密合度的定量评价。结果通过配准、锐化边缘、环切等功能函数,实现了全冠修复体在模型上的虚拟就位,定量表达了全冠的绝对边缘密合度,初步建立了一种绝对边缘密合度的数字化定量获取路线,并对1例修复体进行了评价。结论初步建立了全冠修复体在模型上边缘绝对密合度的三维数字化定量评价方法,为全冠修复体制作效果的数字化评价奠定了基础。     

烤瓷冠桥修复体边缘对牙龈健康的影响

目的　探讨烤瓷冠边缘的处理对牙龈健康的影响。方法　收集已做过烤瓷冠桥修复的患者 1 2 9例 ,观察分析修复体边缘的密合性、伸展度及光洁度对被修复牙牙龈健康 （牙龈出血指数 ）的影响。结果　①修复体边缘超过龈下 1mm（Ⅰ3组 ）对牙龈健康的影响最大 ,而其他各组相对较轻。②修复体边缘密合性对牙龈健康状况的影响为 :A组优于B组 ,B组优于C组和D组。结论　冠桥修复体的边缘与牙周健康密切相关 ,烤瓷冠桥修复体的边缘应尽可能光洁、密合、无悬突 ,伸展度以不超过龈缘下 1mm为宜。     

全冠边缘位置和密合度对牙龈健康的影响

目的了解全冠的边缘位置、密合度与牙龈健康三者之间的关系.方法临床收集非贵金属烤瓷全冠修复患者232例,所有患者均为单冠修复,修复时间为2～5年.其中龈上边缘61颗,边缘齐平龈缘51颗,龈下边缘120颗.检查其边缘密合性和龈炎发生率.结果①全冠边缘位置位于龈下者龈炎发生率较高,平齐龈缘者龈炎发生率较低.②边缘密合性良好的全冠修复体龈炎发生率较低,即使发生龈炎也多为轻度龈炎.密合性差的修复体龈炎发生率为100%.③边缘位置不同,密合性相同,龈炎发生率不同,程度不同.④龈下边缘的密合性较龈上或平齐龈缘者差.结论修复体边缘位置对牙龈健康有影响,但边缘密合性对牙龈组织健康比边缘位置更为重要.因美观及固位等因素的需要可设计龈下边缘,但后牙区如无特殊要求,尽量利用齐平龈缘的边缘设计.     

烤瓷冠边缘密合度对龈沟液IL-1β水平的影响

目的探讨烤瓷冠修复对患牙牙周组织的影响。方法20例烤瓷冠根据边缘密合度分为优良组（Ⅰ组）和合格组（Ⅱ组），每组10例，以对侧健康同名牙为对照。在修复后6个月复诊，进行牙周状况的临床检查，并采集患牙及对称同名牙的龈沟液，用ELISA法检测IL-1β含量。结果两组龈沟液IL-1β含量均显著增高，并有牙龈指数、探诊深度和龈沟液量的增高。Ⅱ组增高较Ⅰ组更明显。结论烤瓷冠修复影响患牙牙周健康，提高边缘密合性可减轻不利影响。     

金沉积烤瓷冠密合度的评价

目的：评价利用金沉积法制作的修复体的密合度。方法：22个离体前磨牙分为两组进行随机配对,牙体预备后利用硅橡胶翻制硬石膏模型,分别用金沉积法和常规失蜡铸造法制作烤瓷内冠。将硅橡胶注入完成的烤瓷冠和预备后的离体牙之间,获得间隙的模型,然后用金属显微镜在放大100倍下对其厚度进行测量。使用配对t检验分析其密合度差异有无显著性。结果：利用金沉积法制作的烤瓷冠的缝隙平均为25．6μm,常规失蜡铸造法的为33．4μm,配对t检验表明其差异具有显著性(P=0．000)。结论：利用金沉积法制作的烤瓷内冠有良好的适合性。     

玷污层对复合树脂修复体密合度的影响

玷污层是窝洞制备后,贴附于洞壁表面的一薄层物质,结构较正常牙体组织疏松,但粘着性较强(见封三图1)。目前就其存在对复合树脂修复体与牙体组织粘结影响的研究较多,而对密合度的影响研究较少,本实验的目的在检测玷污层对复合树脂修复体密合度的影响。     

Clinical marginal gap of porcelain fused to electro-formed gold coping crowns

This study evaluated the marginal and internal gaps of Auro Galvano Crowns (AGC) in vivo. One hundred AGC crowns were examined using white and black silicone materials; the thickness of the silicone layer was measured at 16 reference points using a microscope. The mean marginal gaps among anterior, premolar and molar teeth, and the mean gaps within the groups were compared by analysis of variance and Dunnett T3 test. The results showed that at the margins, there were no significant differences among the four measuring points within each group, and there were no significant differences in the mean marginal gaps among the three groups. The mean marginal gaps in all groups were within the limits of clinical acceptability.     

The effect of porcelain laminate veneers on gingival health and bacterial plaque characteristics

Abstract. The aim of this study was to evaluate the response of microbial plaque and gingival inflammation to the placement of porcelain laminate veneers on anterior teeth. 9 patients, 7 female and 2 male (mean age of 30 years), with a total of 35 veneers were examined. The volume of gingival crevicular fluid (GCF), level of neutral proteolytic enzyme activity, gingival index (GI), plaque index (PII) and plaque bacteria vitality were measured at baseline and after the placement of veneers. The volume of GCF increased after the placement of veneers ( p =0.03). No statistically significant differences were found in proteolytic enzyme activity or GI ( p >0.05). There were statistically significant reductions in PII ( p =0.000) and plaque bacteria vitality ( p =0.018). Further research is required to assess the long-term influence of porcelain laminate veneers on gingival health and microbial plaque characteristics.     

金属烤瓷冠修复体对牙龈健康的影响因素

金属烤瓷冠是临床上最基本和常见的一种修复方法,冠修复体周围牙龈组织的健康状况是判断其最终修复效果的关键所在.在临床上,烤瓷冠修复治疗的过程中,与牙龈健康关系密切的主要因素包括金属烤瓷冠所使用的材料、冠边缘的形态和宽度、冠缘线的位置、烤瓷冠颈缘的适合性、烤瓷冠的外形和邻接以及烤瓷冠表面及冠牙体衔接部的粗糙程度等等,本文就这些主要影响因素进行综述.     

The relationship of the position of crown margins to gingival health

A survey was conducted of 423 crown margins that were divided into 355 subgingival margins and 68 supragingival margins. The plaque index, gingival bleeding, and recession surrounding the artificial crown were recorded and compared to the unprepared contralateral tooth. Gingival tissues tended to bleed 2.42 times more frequently with subgingival margins and have a 2.65 times higher chance of gingival recession. Crowns with supragingival margins did not differ significantly compared with the contralateral tooth, but crowns with subgingival margins had greater bleeding and recession compared with the contralateral tooth. It is recommended that supragingival margins become standard clinical procedures when feasible. A further analysis will be instituted to determine whether different crown materials affect the gingivae.     

Evaluation of the marginal gingival health using laser Doppler flowmetry

The purposes of this study were to compare the gingival blood flow (GBF) in test sites (teeth retaining fixed partial dentures) and control sites (contralateral natural teeth) and investigate whether there is any relationship between clinical indices and GBF values. Twelve healthy subjects (6 females and 6 males) aged 20 to 54 years were enrolled this study. The GBF was measured from the middle point of the marginal gingiva in the test and control sites using laser Doppler flowmetry (LDF). Additionally, plaque index, gingival index and probing depth measurements were recorded. Statistically significant difference (p<0.05) was found between the test and control sites for marginal GBF. In contrast, no significant difference (p>0.05) was found between test and control sites with respect to the clinical indices, except for plaque index. The findings of this study suggest that there is a significant relation between resin-bonded fixed partial dentures with margins located subgingivally and marginal GBF. Clinical indices are helpful to collect information about the clinical health status of gingival tissues, but GBF is a good tool to measure gingival tissue blood flow and assess periodontal health. In conclusion, laser Doppler flowmetry can be used together with clinical indices to evaluate the marginal gingival health.     

四种复合树脂材料与牙体间边缘密合度的研究

目的:对Poss复合树脂及其余3种临床常用复合树脂材料与牙体间边缘密合度比较分析,为临床上更好地选择充填材料提供依据。方法:将40颗离体牙随机分成4组,每组10颗牙,按照国际标准备V类洞,分别用Poss复合树脂,3M Z350复合树脂,Durafill复合树脂,Charisma复合树脂充填牙体,恒温保存,品红染色后,近远中方向剖开牙体,扫描电镜下测量每组充填体与牙体间的边缘密合度。结果:Poss复合树脂与牙体间边缘密合度最小,其次为3MZ350复合树脂,Durafill复合树脂,Charisma复合树脂。结论:Poss复合树脂这种新型材料可以作为临床充填材料,目前临床常用树脂Z350复合树脂与牙体间边缘密合度最小。