MMP-3在咬合创伤牙周组织中的表达

目的:探讨基质金属蛋白酶-3(MMP-3)在咬合创伤牙周组织的表达和意义。方法:通过在Wistar大鼠左侧上颌第一磨牙粘结高出咬合面的牙本质固位钉建立咬合创伤动物模型,应用免疫组织化学方法观察咬合创伤后24h、3、7、15和30d MMP-3在牙周组织的表达。结果:咬合创伤后,随着病变程度不断加重,MMP-3在牙周组织的表达逐渐增强,咬合创伤15d时MMP-3的表达达到最强,咬合创伤1个月时,MMP-3的表达有所下降。结论:MMP-3可能在咬合创伤牙周组织的破坏过程中起重要作用。     

高频电刀龈成形术后烤瓷冠修复的牙周情况分析

目的:观察烤瓷冠修复前行高频电刀龈成形术对基牙牙周组织的影响.方法:收集需行高频电刀龈成形术后再作烤瓷冠修复的患者91例135颗牙,修复后1年复查牙周情况,分析患者术后1年牙龈成形效果、牙龈指数、牙菌斑指数、牙周探诊深度、牙齿动度.结果:龈成形术后烤瓷冠修复1年5.9%患者出现牙龈增生或退缩;牙龈指数轻度上升,有显著性差异;菌斑指数、牙周探诊深度、牙齿动度无明显差异.结论:高频电刀龈成形术对其后烤瓷冠修复基牙牙龈成形效果良好,对基牙牙周健康无明显不良影响.     

Fibulins and matrilins are novel structural components of the periodontium in the mouse

Periodontitis refers to inflammatory disease of the periodontal structures (the gingiva, dental cementum, periodontal ligament (PDL) and alveolar bone) that ultimately leads to their destruction. Whereas collagens are well-examined main components of the periodontium, little is known about the other structural proteins that make up this tissue. The aim of this study was to identify new extracellular matrix (ECM) components, including fibulins and matrilins, in the periodontium of mice.After sacrificing 14 mice (Sv/129 strain), jaws were prepared. Each tissue sample contained a molar and its surrounding alveolar bone. Immunohistochemistry was carried out on paraffin-embedded sections.Our results show that mice exhibit fibulin-3, -4 and -5 and matrilin-1, -2, -3 and -4 in PDL and in blood vessels of alveolar bone and PDL as well as in the pericellular matrix of osteocytes and cementocytes. In dental cementum, only fibulin-4 is expressed.For the first time, we show that fibulin-3, -4 and -5 and matrilin-1, -2, -3 and -4 are essential components of the periodontal tissues. Our findings indicate an association of these proteins with collagens and oxytalan fibers that might be of future interest in regenerative periodontitis therapy.     

基牙牙周损伤影响可摘局部义齿应力分布的三维有限元分析

目的 探讨三维红外扫描用于可摘局部义齿三维有限元建模的可行性,并分析基牙牙周损伤对可摘局部义齿应力分布的影响,以期为临床提供参考.方法 利用齿科非接触式红外扫描仪和Simpleware软件对下颌肯尼迪分类法Ⅱ类缺损的可摘局部义齿进行三维建模,构建正常牙槽骨组、牙槽骨吸收组和牙槽骨吸收伴牙周膜增宽组三维有限元模型.使用Abaqus有限元分析软件,研究垂直加载和颊侧45°加载条件下3组牙槽骨的应力分布.结果 垂直加载和颊侧45°加载条件下,3组模型均在义齿近中基牙和剩余牙槽嵴远中出现应力集中;牙槽骨吸收伴牙周膜增宽组近中基牙的应力最大(分别为3.57和2.50 MPa),其次为牙槽骨吸收组(分别为3.21和2.41 MPa),正常牙槽骨组最小(分别为2.63和1.79 MPa).颊侧45°加载时3组模型剩余牙槽嵴远中颊侧和远中位点上的应力值均大于垂直加载.结论 基于三维红外扫描的有限元建模方法是可摘局部义齿有限元应力分析有效的建模方式.     

Alcoholic and isocaloric diet,but not ovariectomy,influence the apoptosis of bone cells within the alveolar bone crest of rats

ObjectiveStudies suggest that chronic alcoholism as well as oestrogen deficiencies may affect bones in general, including alveolar bone and, by doing so, increase individuals’ susceptibility to develop progressive periodontal disease. This paper aims to verify the influence of chronic alcoholism and/or oestrogen deficiencies in the apoptosis of bone cells of the alveolar bone crest region in rats.DesignInitially, 54 rats were divided into ovariectomized (Ovx) and Sham operated (Sham) groups. Thirty days after surgery, these two groups were equally sub-divided, and received, for 56 days, the following dietary intervention: alcoholic diet (with 20% alcohol solution,), isocaloric diet and ad libitum diet (free diet). Analysis was undertaken by immunohistochemistry, using an antibody to detect apoptosis (anti PARP p-85).ResultsWhen comparing the six experimental groups, no significant differences were observed in the apoptosis of bone cells. Also, there was no significant difference in the quantity of cells undergoing apoptosis when the animals from Ovx groups were compared with those from Sham groups. However, when comparing only different dietary groups, differences were observed between the groups ad libitum and isocaloric, to osteoblasts (p = 0.045); and ad libitum and alcohol, to osteocytes (p = 0.007).ConclusionIt is concluded that ovariectomy was not able to influence the rate of apoptosis of bone cells of the alveolar bone crest region in rats and that a possible influence of diet on apoptosis of osteoblasts and osteocytes cannot be ruled out.     

不同材料PFM对患者牙周组织、龈沟液中炎症因子水平的影响

[目的]探讨不同材料的烤瓷熔附金属全冠(PFM)修复后对患者牙周组织、龈沟液中炎症因子水平的影响.[方法]选取本院2013年1月至2015年6月接受牙修复的患者60例,根据修复材料分为:镍铬合金烤瓷冠修复(A组)、镍铬合金镀金烤瓷冠修复(B组)、金沉积烤瓷冠修复(C组)各20例,测定三组患者修复前、修复后6个月的龈沟液量(GCF)、龈沟探诊深度(GCD)、牙龈指数(GI)、龈沟液中肿瘤坏死因子-α(TNF-α)、白细胞介素-1β(IL-1β)、白细胞介素-6(IL-6)、白细胞介素-8(IL-8)的水平.[结果]修复前,A组、B组和C组患者的GCF、GCD、GI指数差异均无统计学意义(P＞0.05);修复6个月后复查,A组患者的GCF、GCD、GI指数较修复前显著升高(P＜0.05),A组患者的GCF、GCD、GI指数显著高于B组和C组患者(P＜0.05);修复前,A组、B组和C组患者龈沟液中TNF-α、IL-1β、IL-6、IL-8的水平差异均无统计学意义(P＞0.05);修复6个月后复查,A组患者的TNF-α、IL-1β、IL-8的水平较修复前显著升高(P＜0.05),A组患者的TNF-α、IL-1β、IL-8水平显著高于B组和C组患者(P＜0.05).[结论]镍铬合金烤瓷冠对患者的牙周组织影响更为明显,患者牙龈沟液中炎症反应因子水平更高.     

碱性成纤维细胞生长因子对犬牙周组织再生的影响

目的了解碱性成纤维细胞生长因子(bFGF)对犬牙周组织再生的影响.方法选用4只成年杂种犬,其上颌两侧的前磨牙(P1、P2、P3)、第1磨牙(M1)和下颌两侧的前磨牙(P2、P3、P4)、第1磨牙(M1)作为实验区牙.在每个象限4个牙位的近中根颊侧人工制备"U”形骨缺损,并设计为4组①对照组;②bFGF组;③ePTFE组;④bFGF+ePTFE组.每次手术做1个象限的牙位,每周1次,连续4次完成.所有动物4w处死,标本作组织学分析.结果3、4w各处理组较空白对照组均有更多的新骨和牙骨质形成.结论bFGF单独或与屏障膜联合体内应用时,均能促进牙周组织的再生.     

不同正畸力作用下牙周组织中碱性成纤维细胞生长因子表达的实验研究

目的 探讨不同正畸力作用下兔牙周组织中碱性成纤维细胞生长因子(basic fibroblast growth factor,bFGF)的表达与分布及其在正畸牙移动过程中的作用和机制.方法 建立兔正畸牙移动模型,实验组分别施加10、50、100g力.1周后将动物处死,制备左侧上颌第一磨牙及牙周组织的标本,进行免疫组化染色(HI-SABC法)后检测、分析,并与对照组比较.结果 对照组bFGF染色呈弱阳性,受力10g组与对照组间差异无统计学意义,受力50g组与对照组相比差异有统计学意义,受力100g组与对照组间差异无统计学意义,其余两两比较差异无统计学意义.结论 在适宜的矫治力作用下,牙周组织中bFGF表达增强;bFGF可能参与了正畸牙移动,并促进了正畸牙牙周组织的修复重建.     

Gingival Condition Associated with Partial Orthodontic Treatment

A longitudinal clinical study on gingival condition was made on seventy-five patients treated with fixed orthodontic appliances in one or both dental arches. Fifty-three non-treated subjects of comparable age were included for further reference. The prevalence and severity of gingivitis about the maxillary teeth were compared for partial (i.e. banding of all maxillary teeth) and full (i.e. banding of all maxillary and mandibular teeth) orthodontic treatment. Plaque accumulation and gingival status were assessed according to the Plaque and Gingival Index systems. Gingival hyperplasia was recorded by linear measurements using pocket probes.

The results demonstrated that all patients developed generalized gingivitis during the period of active treatment. The proximal areas were invariably more affected than the buccal areas, and posterior teeth more than anterior teeth. Although the GI, PII and pocket depth values were constantly lower when treatment was limited to the maxillary teeth, the differences were small and generally not significant. Also the healing of the gingiva after removal of the appliances was more rapid when partial treatment was used. In neither orthodontic group, however, any permanent damage to the periodontal tissues could be demonstrated with the methods used.