双线排龈法在烤瓷冠修复牙体缺损中的临床应用

目的:探讨双线排龈法在烤瓷冠修复牙体缺损中的临床应用效果,为临床提供参考。方法:选择2014年3月至2016年3月来我院拟行烤瓷冠修复的96例患者,按照患者入院顺序交替分为观察组和对照组,每组48例。观察组48例(56颗牙)采用双线排龈法,对照组48例(52颗牙)采用单线排龈法,观察和比较两组的排龈效果及随访24周的基牙与游离龈是否完全排开,龈沟宽度是否合适,牙体预备后肩台的边缘是否清晰、连续,印模肩台是否清晰、连续,有无气泡,模型是否清晰、光滑,牙龈有无渗血等。结果:观察组基牙与游离龈排开不全、印模肩台不清晰不连续或有气泡、模型不清晰不光滑、牙龈渗血的发生率均显著低于对照组(P0.05)。修复后24周,两组的修复体边缘隐蔽性比较差异无统计学意义(P0.05),观察组0级牙数为52颗(92.9%),对照组0级牙数为41(80.8%),观察组的牙周组织情况明显优于对照组(P0.05)。结论:在前牙烤瓷冠修复中应用双线排龈法的排龈效果较单线排龈法更好。     

EXPASYL排龈膏对不同牙龈指数龈下缺损修复的临床研究

目的:观察EXPASYL排龈膏法在不同牙龈指数(gingivalindex,GI)龈下牙体缺损充填修复中的排龈效果及远期疗效。方法:将152例(180颗牙)累及龈下的Ⅱ类洞按照不同GI分级原则,随机分为对照组、G1、G2 3组,对每组排龈临床效果及两年内充填体的脱落率进行对比分析。结果:不同牙龈指数的排龈效果及远期修复效果相同,差异无统计学意义。结论:GI指数≤2时,排龈效果及远期修复效果理想。     

EXPASYL排龈膏对不同牙龈指数龈下缺损修复的临床研究

目的：观察EXPASYL排龈膏法在不同牙龈指数（gingivalindex,GI）龈下牙体缺损充填修复中的排龈效果及远期疗效。方法：将152例（180颗牙）累及龈下的Ⅱ类洞按照不同G1分级原则,随机分为对照组、G1、G23组,对每组排龈临床效果及两年内充填体的脱落率进行对比分析。结果：不同牙龈指数的排龈效果及远期修复效果相同,差异无统计学意义。结论：GI指数≤2时,排龈效果及远期修复效果理想。     

排龈线对牙体楔状缺损患者炎症反应及悬突的预防效果

目的:探讨排龈线技术对牙体楔状缺损患者行充填修复术后发生悬突和炎症反应的预防作用。方法:选择我院收治的100例龈下牙体楔状缺损患者,根据治疗方式不同分为研究组和对照组。研究组采用排龈线技术对牙体楔状缺损排龈后以复合树脂充填,对照组对牙体楔状缺损常规处理后以复合树脂充填。观察并比较两组患者牙体楔状缺损的修复效果、悬突发生率,以及充填体颊侧龈沟液中天冬氨酸转氨酶(AST)的水平变化。结果:治疗后,两组患者AST水平均较治疗前升高,但研究组AST水平低于对照组,差异有统计学意义(P0.05);研究组充填体脱落率及边缘不密合率均低于对照组,差异有统计学意义(P0.05);对患者随访1年,研究组悬突发生率低于对照组,差异有统计学意义(P0.05)。结论:排龈线技术可有效减少牙体楔状缺损患者牙周组织炎症反应,降低悬突的发生率,值得临床推广应用。     

排龈线在楔状缺损充填修复中的应用体会

楔状缺损为临床常见牙体病,多采用光固化树脂或玻璃离子体水门汀充填修复。楔状缺损为位于唇颊侧牙颈部的硬组织缺损,缺损部位多可达龈缘以下。充填修复的质量对牙及牙周的健康有重要的影响。近两年来我科应用排龈线在楔状缺损充填前进行排龈,使缺损部位充分暴露,充填效果满意。     

预成龈下桩修复前牙龈下残根的临床应用研究

目的:探索前牙缺损至龈下3mm内的残根的修复方法.方法:对20例前牙缺损至龈下甚至骨内3mm的残根运用预成龈下桩技术进行修复,分别于修复后1个月、6个月及12个月对预成龈下桩修复体进行临床检查;应用Image Pro-Plus图像处理软件对修复前、修复后6个月及12个月的X光牙片进行比较,分析残根周围牙槽骨的吸收程度.结果:20例病例中,18例成功,2例失败;残根周围牙槽骨在不同的修复时间吸收率无统计学差异.结论:应用预成龈下桩技术修复前牙龈下3mm内的残根,修复效果较好.     

螺丝固位修复和粘接固位修复在牙列缺损患者中的应用效果及对龈下菌群分布的影响

目的探讨螺丝固位修复、粘接固位修复在牙列缺损患者中的应用效果及对龈下菌群分布的影响。方法选择2016年12月至2018年12月在我院进行牙种植并完成修复体的牙列缺损患者98例,参照随机数表法将入组患者分为螺丝固位修复组和粘接固位修复组,各49例。对比两组患者修复后3个月、修复后12个月牙周健康指标[种植义齿边缘骨吸收量(MBL)、探诊深度(PD)、改良菌斑指数(mPLI)、改良出血指数(mSBI)]、咀嚼功能(咬合力、咀嚼效率)以及龈下菌群分布的差异。结果修复后3个月和修复后12个月,两组患者MBL、PD、mPLI、mSBI水平及咬合力、咀嚼效率差异无统计学意义(均P0.05);两组患者龈下产黑色素菌、伴放线放线杆菌数量差异无统计学意义(均P0.05)。螺丝固位修复组患者龈下厌氧菌、具核梭杆菌数量大于粘接固位修复组患者(均P0.05)。结论螺丝固位修复、粘接固位修复均是牙列缺损修复的有效方法,螺丝固位修复可能导致术后龈下厌氧菌繁殖增加,需进行长期监测。     

固定矫治器对牙周指数及龈下菌群影响的实验研究

选择15例口腔卫生良好、牙周组织健康的正畸患者的90个牙位点,在黏接固定矫治器附件前进行菌斑指数、牙龈指数和探诊深度等临床牙周指数及龈下细菌的检测;根据患者上下颌牙齿错位畸形严重程度进行单颌牙齿黏接固定矫治器附件作为实验组,以暂不黏接固定矫治器附件的对颌牙齿作为对照组,在患者4周、8周复诊时进行重复检测。结果显示,戴用固定矫治器后牙齿的临床牙周指数与对照组及戴用矫治器前相比较,没有显著性差异(p>0.05);龈下细菌构成及比例亦未发生明显变化(p>0.05)。研究表明,戴用固定矫治器的患者如能认真保持口腔卫生,对牙周组织健康不会产生显著不良影响。     

牙周炎治疗过程中龈下菌斑的动态观察

目的　通过对牙周炎治疗过程中龈下菌斑内螺旋体和球菌的百分比组成的改变进行动态观察研究,为牙周炎的诊断和疗效评价提供依据。方法　选择１８ 例经门诊确诊为成人牙周炎的患者,随机分为Ａ、Ｂ、Ｃ 三组,均施以龈上洁治、龈下刮治和根面平整术。其中Ａ 组和Ｂ 组分别给予艾利克及洗必太含漱液含漱。所有患者每周复诊一次,采集龈下菌斑,进行刚果红染色,镜检计数螺旋体及球菌的百分比,同时检测患处牙龈指数（ＧＩ） 。结果　Ａ、Ｂ 组患者经治疗１ 周后,ＧＩ值变化极为显著（Ｐ＜ ０．０１） ,螺旋体的减少及球菌的增加也极具显著性（Ｐ＜ ０．０１） ,至３ 周时趋于稳定;Ｃ 组则在１ 周时ＧＩ值及菌斑组成的变化有显著性（Ｐ＜ ０．０５） ,至２ 周时变化才最为明显（Ｐ＜ ０．０１） ,４ 周时趋于稳定。结论　牙周基础治疗能明显改善临床症状,使螺旋体百分比显著降低,球菌百分比显著增加。口腔含漱液作为一种牙周炎的辅助用药,可明显改善菌斑的组成,促进正常口腔卫生环境的建立。     

多排螺旋CT对隐匿性肋骨骨折的诊断价值及最佳复查时间研究

目的:探讨多排螺旋CT对隐匿性肋骨骨折的诊断价值及最佳复查时间。方法:选取2017年7月到2018年7月期间在我院接受治疗的胸部外伤患者95例,在首次检查时均接受了X线平片和多排螺旋CT检查,比较首次检查时X线平片和多排螺旋CT的检出率,比较首次检查时X线平片和多排螺旋CT对不同类型骨折的诊断情况,比较各个时间段复查病例的肋骨骨折数与首次检查时的差异。结果:95例患者中最终86例确诊存在肋骨骨折,首次检查时多排螺旋CT的检出率为95.35%(82/86),高于X线平片的82.56%(71/86)(P0.05)。86例患者最终确定共存在骨折289处,首次检查时X线平片共检出246处,多排螺旋CT共检出274处,多排螺旋CT对线性骨折、凹陷性骨折的检出率高于X线平片(P0.05)。伤后11-20d、伤后41-50d、伤后51-60d的复查肋骨骨折数与首次检查肋骨骨折数比较无统计学差异(P0.05),伤后21-30d、伤后31-40d的复查肋骨骨折数高于首次检查肋骨骨折数(P0.05)。结论:多排螺旋CT对隐匿性肋骨骨折有较高的诊断价值,首次诊断时的检出率明显高于X线平片,伤后21-40d这个时间段是进行复查的较佳时间段,可获得较好效果。     

Comparative analysis of different impression techniques in relation to single tooth impression

It is of interest to compare the accuracy of three different impression techniques for a single tooth impression. We used 3 groups with 15 samples each in this study. Group 1: Putty and light body in a sectional stock tray; Group 2: Monophase and extra light body in a sectional stock tray; Group 3: Matrix impression technique. 15 impressions were taken of a prepared tooth on a typodont with each technique. The dimensions of the casts poured from these impression techniques were compared with the control typodont tooth. Data analysis shows that the matrix impression technique gave the best results in terms of dimensional study followed by monophase and extra light body impression technique and putty and light body impression technique gave the least accurate results. The results show that there is a statistically significant difference between the three impression techniques in terms of dimensional stability. Data analysis shows that the matrix impression technique gave the best results in terms of dimensional study followed by monophase and extra light body impression technique and putty and light body impression technique gave the least accurate results. The variations between the groups are within acceptable limits. Hence, it can be concluded that all the impression techniques will result in adequate dimensional stability and can be used in clinical scenarios.     

全冠牙体预备后局部龈沟菌群的变化

目的 :定量观察临床全冠修复患者牙体预备完成 1w内 ,其龈沟菌丛的变化。方法 :选择 14颗需进行全冠修复的第一磨牙作为研究对象 ,以同颌同名牙作为研究对照 ,分别采集牙体预备前、预备后 72h及 1w时 ,预备牙和同颌同名牙龈沟菌丛的标本。经细菌接种、厌氧培养、生化鉴定 ,进行可培养菌计量。比较同一时期预备牙龈沟菌丛与同颌同名牙龈沟菌丛间 ,以及不同时期预备牙龈沟菌丛间可培养菌量的变化。结果 :(1)牙体预备后 1w内 ,预备牙龈沟菌丛中多数细菌菌量接近或超过预备前水平 ,差异无显著性 (P>0 .0 5 ) ,但以放线菌为主的 G+性杆菌增多明显。(2 )同一时期以放线菌为主要的 G+杆菌和奈瑟菌的菌量在预备牙龈沟菌丛和同颌同名牙龈沟菌丛间差异有显著性 (P<0 .0 5 )。结论 :(1)牙体预备后 ,预备牙龈沟菌丛的自然变化过程 ,与天然牙菌斑形成过程相似 ,其龈沟菌丛菌量和菌种随时间的延长而增多。 (2 )预备牙龈沟菌丛和同颌同名牙龈沟菌丛间以放线菌为主的 G+杆菌和奈瑟菌差异有显著性 (P<0 .0 5 )。     

A double blind randomized controlled trial to evaluate the efficacy of green tea in gingivitis

Gingivitis is the most common form of oral disease especially among patients undergoing fixed orthodontic treatment. Green tea, which is extensively used in Asian countries, can help to improve the overall gingival health, which can be assessed by using the gingival indices. Evaluation of the effectiveness of green tea on the gingival health of patients undergoing Orthodontic treatment is of interest. 40 otherwise healthy patients undergoing fixed orthodontic treatment were randomly divided in two groups namely (1) study group and (2) control group. Gingival indices were scored for all the patients. Study group was given mouth rinse with green tea extract and control group was given placebo with no green tea extract. Gingival indices were measured for all the patients after 21 days. Mann Whitney U test and Wilcoxon test was used for statistical analysis. The gingival indices scoring in which the values before and after the use of mouthwash were compared. The p value was found to be statistically significant (p<0.05) in study group. But in control group statistical significant could not be reached.     

S100A2 level changes are related to human periodontitis

Periodontitis is an inflammatory disease, which, when severe, can result in tooth loss, that affects the quality of life. S100A2 was previously identified as a component of gingival crevicular fluid (GCF) via proteome analysis, but it has not been investigated whether S100A2 plays a role in periodontitis. In this study, we analyzed mRNA expression of S100A2 in gingival tissues from normal and classified periodontal disease patients and compared it to that of S100A8 and S100A9. Quantitative real time-PCR revealed that the mRNA expression levels of S100A2, S100A8, and S100A9 were significantly upregulated in gingival tissues with gingivitis, moderate periodontitis, and severe periodontitis compared to normal tissues. In addition, S100A2 proteins in GCF and the conditioned media of lipopolysaccharide (LPS)-treated Jurkat cells were confirmed by ELISA. S100A2 protein levels were significantly higher in GCF in gingivitis and moderate periodontitis groups than in normal groups. S100A2 mRNA expression and protein secretion were also increased by LPS stimulation. Based on the up-regulation of S100A2 in LPS-stimulated immune cells, gingival tissues and GCF from periodontal disease groups, we conclude that S100A2 is a functional component in the immune response during periodontitis and may serve as a potential biomarker for periodontitis.     

The ontogeny of premolar dental wear in Cercocebus albigena (cercopithecidae)

The orientation of striated wear facets on primate teeth serves as a useful guide for reconstructing jaw movements during mastication. Most wear facets on the molars are formed during one of the two well-documented movements, Phase I or Phase II, of the power stroke. Another jaw movement direction, “orthal retraction” (OR) has been proposed to account for a third set of facets occasionally present on the pointed tips of premolars and molars. Evidence advanced here indicates that OR facets on pointed anterior premolars (P₃) of cercopithecoids are actually Phase I facets that have become reoriented as a result of a rotation of this tooth during its eruption. “Orthal retraction” probably does not exist as a discrete masticatory phase.