不同牙本质粘结系统粘结界面纳米渗漏的比较研究

目的：观察5种牙本质粘结系统粘结界面纳米渗漏。方法：选取25颗无龋坏成人恒磨牙,随机分为5组;选择4种自酸蚀粘结系统Clearfil S3Bond、i Bond、Clearfil SE Bond、XenoⅢ和1种全酸蚀粘结系统Single Bond2,每组分别应用其中1种粘结系统进行粘结处理。在透射电镜（TEM）下观察牙本质粘结界面的纳米渗漏。结果：应用Single Bond2、XenoⅢ分别与应用Clearfil S3 Bond、i Bond和Clearfil SE Bond比较,牙本质粘接界面的纳米渗漏值差异均显著（P〈0.05）;自酸蚀粘结剂i Bond、Clearfil S3Bond和Clearfil SE Bond间比较,纳米渗漏值差异均不显著（P〉0.05）;Single Bond2与XenoⅢ比较,纳米渗漏值差异不显著（P〉0.05）。结论：5种牙本质粘结系统的牙本质界面均存在纳米渗漏,自酸蚀粘结技术需进一步完善。     

固位形及粘结剂种类对楔状缺损树脂修复的影响

目的比较修复楔状缺损时制备固位形及不同粘结剂对临床疗效的影响。方法选择口内至少4颗楔状缺损的患者89例,609颗患牙,同一患者分别采用四种方法修复患牙（固位形＋两步法自酸蚀牙本质粘结系统Clearfil SE Bond;固位形＋一步法自酸蚀牙本质粘结系统iBond;无固位形＋两步法自酸蚀牙本质粘结系统Clearfil SE Bond;无固位形＋一步法自酸蚀牙本质粘结系统iBond）,采用自身对照的方法进行为期1年的临床观察。结果固位形组的成功率明显高于无固位形组,两者差异有统计学意义;无固位形组中两步法自酸蚀牙本质粘结系统ClearfilSEBond组的成功率高于一步法自酸蚀牙本质粘结系统iBond组,两者差异有统计学意义,但二者在边缘密闭性和术后敏感方面差异没有统计学意义。结论修复楔状缺损时,制备固位形有助于提高疗效;两步法自酸蚀牙本质粘结系统Clearfil SE Bond较一步法自酸蚀牙本质粘结系统iBond具有更高的粘结强度。     

不同桩核系统修复年轻恒牙冠折效果比较观察

目的：观察比较纤维桩树脂桩核系统、铸造金属桩核系统和金属螺纹钉树脂桩核系统修复年轻恒牙冠折的临床效果。方法：选择年轻恒牙冠折81例90牙，根尖诱导成形术成功后行根管治疗。随机分为纤维桩组、铸造金属桩组和金属螺纹钉组各30牙。纤维桩组采用石英纤维桩树脂桩核系统修复，铸造金属桩组采用镍铬合金桩核系统修复，金属螺纹钉组采用成品金属根管螺纹钉树脂桩核系统修复。随访2年，比较3组修复效果。结果：随访2年，纤维桩组脱落1例，无一例发生根折和桩折断，成功率96．7％；铸造金属桩组脱落2例，牙根劈裂1例，桩折断2例，成功率83．3％；金属螺纹钉组脱落4例，牙根劈裂1例，钉折断2例，成功率76．7％。3组间成功率比较，差异显著（P〈0．05）。结论：纤维桩树脂桩核系统修复年轻恒牙冠折，在抗根折和美学方面较铸造金属桩核系统和金属螺纹钉树脂桩核系统更具优势。     

LuxaPost珞赛玻璃纤维桩的临床应用体会

目的观察纤维桩修复后牙残冠、残根的疗效。方法对62例80颗后牙残冠、残根,采用德国DMG公司生产的LuxaPost珞赛纤维桩及自酸蚀树脂水门汀粘结,快速形成纤维桩树脂桩核并行全冠修复。结果经过2年的随访观察,81颗牙中有2例分别于修复后10个月和14个月时出现纤维桩的松动、脱落,无根折、桩折现象发生。结论玻璃纤维桩树脂核修复技术是一种快捷、稳固和符合牙体生理的有效修复方法,且不易造成根管壁折裂。     

光强度对双固化树脂黏接剂与牙本质黏接强度的影响

 目的 比较不同光强度对双固化树脂黏接剂与牙本质的黏接强度影响。方法 将40颗恒磨牙,暴露咬合面牙本质后随机分为两组,每组20颗牙。DC组用双重固化树脂黏接剂Clearfil DC Bond处理,SE组用光固化树脂黏接剂Clearfil SE Bond处理后,端端对接从近中方向光照。将黏接试样沿光照方向切成5片(1 mm/片,L_1~5),再将每片垂直黏接界面切出5个微拉伸样本(1 mm×1 mm),测试两组黏接强度(mTBS)。结果 随着穿透牙本质厚度增加,光强度降低导致黏接强度下降。部分样本在制备时发生界面折断,SE组存留样本L₁ 70%,L₂ 30%,L_3~5为0;DC组L_1~5分别为68%,86%,56%,44%和38%。SE 组L_1~5黏接强度分别为:(13.22±8.64)MPa,(7.49±3.88)MPa,0、0、0 MPa;DC组为:(11.25±4.11)MPa,(9.69±5.07) MPa,(8.13±4.88)MPa,(6.83±3.53)MPa和(5.56±2.95) MPa。两组表面两层黏接强度无统计学差异。结论 双固化黏接剂与牙本质的黏接强度随着固化光穿透牙本质深度的增加而降低。     

外伤前牙正畸助萌术后纤维桩的应用评价

目的评价外伤前牙正畸助萌术后纤维桩的应用效果。方法选择10例因外伤导致的单个上前牙冠折至龈缘的患者,行完善的根管治疗后,采用正畸助萌术延长临床牙冠长度后再应用纤维桩系统进行核桩修复及烤瓷冠修复。患者每6个月复诊1次,通过临床检查和X线检查,评估纤维桩核的临床应用效果。结果随访12~30个月,10例患者的基牙无松动,未发生根折,纤维桩树脂核桩冠完好,无松动,无脱落,牙龈组织健康,牙槽骨无吸收,骨硬板连续一致。结论对于外伤所致的上前牙冠折至龈下的病例,采用正畸助萌术和纤维桩核系统进行桩冠修复是较为理想的选择。     

石英纤维桩表面喷砂及硅烷耦联处理对固位力的影响

目的 研究表面喷砂及硅烷耦联处理对石英纤维桩固位力的影响.方法 28根石英纤维桩按析因实验设计随机等分为4组（n=7）：对照组、喷砂组、硅烷耦联组及喷砂-硅烷耦联组,经不同表面处理后将4组纤维桩用树脂黏接系统黏接于经根管预备后的离体牙根管内,制备成薄片试件,经推出实验测试其固位力,分析不同表面处理对固位力的影响.结果 喷砂、喷砂-硅烷耦联组纤维桩固位力较对照组有提高（P〈0.05）,硅烷耦联组纤维桩固位力较对照组无显著性差异（P〉0.05）.结论 对石英纤维桩表面进行喷砂、喷砂-硅烷耦联处理可有效提高固位力.     

Parapost玻璃纤维桩修复残根残冠87例报告

目的：探讨Parapost玻璃纤维桩联合Paracore粘接剂对残根残冠进行桩核全瓷冠修复的临床效果。方法：对87例122颗已行完善根管治疗的前牙残根残冠,利用Parapost玻璃纤维桩联合Paracore粘接剂及树脂核材料形成桩核,再进行全瓷冠修复。治疗完成后第6、12个月复查并观察临床疗效。结果：6个月时复查,86例成功,1例桩冠折断,并立即相同方法再修复;12个月时复查,87例122颗患牙桩核均成功。结论：Parapost玻璃纤维桩联合Paracore粘接剂及树脂核材料形成桩核,操作简便快捷,桩的粘接力强,纤维桩韧性高,不易发生折断及脱落,桩及核无色透明,前牙修复美观,是残根和残冠修复的好方法。     

自酸蚀黏结剂复合树脂修复后牙牙体缺损的临床研究

目的评价自酸蚀黏接剂复合树脂修复后牙缺损的临床效果。方法将344颗患牙随机分为两组,实验组171颗,采用自酸蚀黏接剂Clearfil SE Bond处理后,Z 250通用复合树脂充填;对照组173颗,全酸蚀黏结剂Single Bond处理后,Z250通用复合树脂充填。治疗后1周、3个月、6个月复查。结果治疗后半年定期观察两组修复体在色彩协调性、修复体表面、边缘密合性、边缘着色、牙龈炎性反应及继发龋方面差异均无统计学意义,治疗后1周的牙髓反应情况差异有统计学意义(P<0.05)。结论用自酸蚀黏接系统的复合树脂修复后牙可获得非常满意的临床效果,同时具有操作步骤简便、术后敏感发生率低、化学固化相对容易控制等优点。     

两种桩核系统在严重缺损前牙残根修复中的临床研究

目的：探讨玻璃纤维桩系统和铸造金属桩系统在修复严重缺损前牙中的临床效果。方法本研究是在2008年～2009年,对257例,共324颗具有保留价值的前牙严重缺损残根在根管治疗的基础上,根据患者意愿,分别使用铸造金属桩核和纤维桩核两种桩核,后全冠修复。随访36个月,观察两组患牙的成功率,进行χ2检验。结果造成失败的主要原因是牙根折断、桩折断,其他包括冠脱落、桩脱落、根尖阴影等。结论在适当的适应症选择条件下,纤维桩可广泛的应用于严重缺损前牙残根。     

Optimization of the system of medical service of students of Cadet Schools of the Ministry of Defense of the Russian Federation

One of the factors of the successful military career guidance Cadet schools students is preserving and promoting their health. Medical support of children and adolescents aged 10-17 years should include the full range of medical and preventive measures defined for this group. The state of providing outpatient care for pupils at the Cadet School in St. Petersburg was studied. These results show that full medical care in accordance with the standards can be based only on children's health clinics. It is important that the organization of medical support pupils cadet schools should be cooperate with civilian health care.     

带状疱疹83例误诊原因分析

带状疱疹是由水痘—带状疱疾病毒引起的皮肤科常见疾病。其主要的病理损害,一是受累神经的严重炎症性浸润,继而导致受侵犯神经节内神经细胞变性、坏死;二是皮肤的水泡。迅速抑制神经节和相应的感觉神经纤维的充血、水肿和坏死,防止粘连形成,达到迅速镇痛、改善皮损,缩短病程及防止后遗症的发生是治疗的关键。因而,尽早明确诊断,     

Estimation of accumulated dose of radiation by method of ESR-spectrometry of dental enamel of mammals

ESR-spectrometry was used to investigate radiation-induced paramagnetic centers in enamel of mammals: carnivores (polar bear and fox), ungulates (reindeer, European bison, moose), and man. Values at half the microwave power saturation of the radiation signal, P_1/2, evaluated at room temperature, was found to range from 16 to 26 mW for animals and man. A new approach to discrimination of the radiation induced signal from the total ESR spectrum of reindeer enamel is proposed. ‘Dose-response’ dependencies of enamel of different species mammals were measured within the dose range from 0.48 up to 10.08 Gy. Estimations of ‘radiosensitivity’ enamel of carnivores and ungulates showed good agreement with radiosensitivity enamel of man by ESR method.     

Analysis of the results of the international comparison of activity measurements of a solution of Fe

The results of an international comparison of activity measurements of a solution of ⁵⁵Fe organized by the BIPM in 2005 are reported and analysed. This exercise, which follows the procedures of the CIPM mutual recognition arrangement to update older comparisons, is a renewal of the comparison organized by the BIPM that took place in 1978. A EUROMET comparison was organized in 1996 specifically to compare activity measurements of a ⁵⁵Fe solution by means of liquid-scintillation techniques. Results of these three comparisons are presented and discussed in this paper.

The radionuclide solution was provided by the NPL, which also distributed the samples to the participants. The activity of the ampoules was measured by 16 laboratories using 12 methods producing 25 results. Some general considerations on uncertainty assessments pertaining to the different techniques used are drawn. The outcome of four different estimators is compared from which the presence of at least one outlier can be confirmed. Further measurements should be made to try to reduce the discrepancy between the results. To date the outcome of the present comparison does not show an improvement to that of the 1996 comparison.     

Evaluation of the results of various technics of non-surgical therapy of varicocele

A new method of non-surgical treatment of varicocele syndrome is described: it consists in sclerotherapy of spermatic vein by trans-femoral percutaneous catheterization with balloon-catheters. In 8 cases venous thrombosis has been induced by direct electric clotting. The techniques and a 6 months follow-up are discussed. It is pointed out that this procedure should be considered as the method of choice for tubular lesions and sub-fertility prophylaxis in young people and in childhood.     

延迟性脾破裂误漏诊原因分析

目的探讨延迟性脾破裂误漏诊原因和预防措施.方法回顾性分析总结12例延迟性脾破裂中的诊断和误漏诊的经验与教训.结果本组延迟性脾破裂的误漏诊5例(41.66%).对多发伤与脾破裂并存可能认识不足,外伤史轻微或伤员隐瞒外伤史,缺乏腹痛-缓解-突然再腹痛的典型病史,缺乏“对冲性脾破裂”力学分析和整体化诊断思路等为其误漏诊的主要原因.结论详细的外伤史和全面系统检查,重视腹以外多发伤掩盖腹内脏器伤及延迟性脾破裂可能.确立外伤-腹内脏器伤-脾破裂整体化诊断思路.不间断地辅以B超检查脾形态学变化和腹内有无积液,腹腔穿刺确定有无血腹、X线胸腹部检查观察左侧胸肋角和膈肌运动情况、必要时CT检查以尽早发现脾包膜下血肿,降低延迟性脾破裂误漏诊率.