银汞桩核的应用研究

利用根管修复牙体缺损的桩核技术，已有两百多年历史。早在1700s年，Fauchard就将木桩置人根管辅助牙冠固位。目前临床常用的桩核是铸造金属桩、成品根管桩加复合树脂核。银汞桩核作为一种临床操作简便易行，价格低廉，无需过多制备根冠，不易造成根折的传统的修复牙体缺损的方法，开始引起临床工作者的注意并应用于临床。     

粘结银汞桩核在后牙修复中的应用

临床上常采用二段式桩核加全冠的形式修复经过牙髓治疗的牙齿。因材料和制作方式不同，现有多种类型的桩核系统，但各存在优缺点。近年来，不少学者对粘结银汞桩核进行了研究，它不仅能有效的防止微渗漏，还可以保留较多的牙体组织，而且能有效的避免侧穿，是一种前景广阔的修复形式。     

结扎丝与结扎圈在正畸应用中的比较研究

目的比较两种弓丝结扎方式的椅旁时间以及探讨固定正畸中患者龋易感性的变化与结扎材料的选择是否有关。方法随机选择使用固定矫治器治疗的44名患者,采用随机法在牙列一侧使用结扎丝结扎,另一侧使用结扎圈结扎,并比较两者的椅旁时间。患者托槽周围的菌斑进行细菌厌氧培养,研究正畸治疗3个月患者牙面变形链球菌附着情况的变化。结果用结扎丝的拆、扎上下半口弓丝的总时平均为170.86s,用结扎圈的拆、扎上下半口弓丝的总时平均为121.47s。经统计学分析,两者之间均有显著性差异(P＜0.001)。而固定矫治器黏结后托槽周围牙面菌斑变形链球菌数量和在总菌中的百分比有显著增高,但两种材料牙面菌斑比较无明显差异。结论固定矫治器黏结后患者龋易感性增强。结扎材料的选择并不会对相应牙面菌斑的致龋性产生直接的影响。用结扎圈进行弓丝结扎能够节省椅旁时间,提高工作效率。但结扎圈的使用不能完全替代结扎丝。     

被动结扎在SWA矫治技术中的应用

被动结扎在ＳＷＡ矫治技术中的应用浙江省温州医学院附属第二医院（３２５０００）林新平，胡荣党，张秀华浙江省洞头县中医院薜丽玲近年来，镍钛等高弹性弓丝的研制及临床应用取得了成功，但由于刚性不足，在持续弹性力作用下易变形，不能复原。因而在牙齿使用高弹性弓丝...     

六手操作技术在慢性根尖周炎根管预备治疗中的应用研究

目的 探讨六手操作技术在慢性根尖周炎根管预备治疗中的工作效率和病人满意度。方法 选择300例磨牙随机分为3组,分别采用六手操作(实验组)、四手操作(对照组Ⅰ)和传统配合操作(对照组Ⅱ),进行根管预备操作时间和病人满意度的记录,作χ2检验。结果 六手操作的根管预备时间及操作满意度与四手操作、传统配合操作比较,有高度显著性差异(P<0.005)。结论 六手操作技术可以提高工作效率,增加病人满意度。     

六手操作技术在口腔临床中的应用现状

[摘要] 随着口腔诊疗技术的迅速发展,我们在原有的四手操作的基础上进行改良,采用六手操作的新模式,取得了一定的效果。现将六手操作的优越性,提高患者的满意度,减轻医生的疲劳,预防医源性交叉感染,护士的规范化培训,以及在口腔临床应用做一综述。     

正畸在外伤前牙固定中的应用探讨

前牙外伤是口腔科门诊、诊常见多发病。常规治疗方法是采用金属丝牙夹板固定、树脂粘结固定等,常存在固位不良,刺激牙龈等缺点[1]。我们从2004年采用方丝弓矫治器同压模透明保持器相结合的办法固定外伤前牙,取得了较好的效果。1临床资料1.1病例分组选择前牙外伤松动病例54例,男     

微小种植体支抗在正畸临床中的应用

通过对利用微小种植体作为支抗来完成关闭拔牙间隙、推磨牙向远中、压低后牙、压低前牙、解决后牙锁、上颌单侧扩弓、协助导萌、直立或前移磨牙的正畸矫治的描述,介绍了常见的微小种植体支抗在正畸临床的应用方法,以期为正畸医生在临床正确使用微小种植体提供一定的帮助.     

牙科pd操作在种植义齿固定修复中的应用

介绍了ｐｄ操作在种植义齿固定修复中的应用体会，并介绍了ｐｄ操作的体位及动作、空间及环境设施的信息技术三方面的具体运用优势。作者认为，护士熟练地掌握牙科ｐｄ操作，可大大提高护理工作效率及工作质量。     

Influence of filler level on the bond strength of orthodontic adhesives

OBJECTIVe: To evaluate the effect of different filler contents of orthodontic adhesives on shear bond strength and Adhesive Remnant Index (ARI). MATERIALS AND METHODS: Four experimental adhesive groups were created: group 1 was an unfilled urethane-dimethacrylate (UDMA) adhesive, group 2 consisted of UDMA and a filler content of 30 vol%, group 3 consisted of UDMA and a filler content of 50 vol%, and group 4 was manufactured with a filler level of 70 vol% in a UDMA matrix. The embedded filler was silicon dioxide. After etching and priming, stainless steel brackets were bonded to extracted human third molars (n = 60) with the experimental adhesives (15 teeth per group). After storage in distilled water for 72 hours, shear bond strength and ARI scores were evaluated. Kruskal-Wallis and post hoc test were performed for statistical analysis. RESULTS: Shear bond strength of UDMA-based adhesives depends on filler content. Higher adhesive filler levels reveal greater bond strength between enamel and stainless steel brackets. ARI scores showed no significant difference among the groups. However, higher filled adhesives (filler content 70 vol%) seem to present higher ARI scores. CONCLUSION: Highly filled UDMA adhesives offer greater bond strength than do lower filled or unfilled resins.     

Adhesion of bonded orthodontic attachments to dental amalgam: In vitro study.

Bonding orthodontic attachments to molars is difficult in the presence of extensive buccal amalgam restorations. The purposes of this study were (1) to examine different amalgam surface preparations, (2) to examine properties of adhesive cements to amalgam, (3) to determine the most shear-resistant bonding technique and (4) to discuss whether these shear bond strengths were of adequate magnitude to be of clinical acceptability. The sample consisted of 108 standardized amalgam cylinders divided into 9 groups of 12 based on surface treatment technique and resin type. SPEED brackets (Strite Industries, Cambridge, Ontario) were bonded to amalgam surfaces that were either polished, sandblasted with 50 microm aluminium oxide, or chemically corroded. Adhesives used were Phase II (Reliance Orthodontic Products Inc, Itasca, Ill), Panavia EX (J Morita USA Inc, Tustin, Calif), or C & B Metabond (Parkell, Farmingdale, NY). After thermocycling from 10 degrees C to 50 degrees C 10,000 times, all samples were tested for shear bond strength with the Universal Testing Machine (Instron Corporation, Canton, Mass). The results show significantly higher bond strengths for all of the resin systems when sandblasting of the amalgam surface is used (P <.0001). Only Panavia EX bonded strongly to polished samples, suggesting the presence of a chemical bond. Laboratory acceptable bond strengths to amalgam are possible. The surface characteristics of the amalgam appear to be more influential in the strength of the bond than does the nature of the resin.     

Application of orthodontic mini-implants in adolescents

The aim of this study was to determine the success rate of mini-implants in adolescents, and also whether a latent period is necessary and the optimum placement torque in an attempt to improve the success rate in adolescent patients. There were 57 orthodontic patients involved in the study, with ages ranging from 11.7 to 36.1 years, who underwent surgery to insert mini-implants (169 implants). When a mini-implant endured an orthodontic force applied for 6 months or more without any mobility, it was considered a success. The success rate was 63.8% in the early-load group (less than 1-month latent period) of adolescents, 97.2% in the late-load group (3-month latent period) of adolescents and 91.9% in the adult group. The success rate of the early-load group of adolescents was significantly inferior to those of the other groups (P<0.01). In measurements of the placement torque in adolescents, the success rate of the 5-10 N cm group was significantly higher than the other groups only in the maxilla of the early-load group. Although the optimum torque could not be defined, a latent period of 3 months before loading is recommended to improve the success rate of the mini-implant when placed in the alveolar bone in adolescent patients.     

牵张成骨术在正畸领域的应用

牵张成骨术是通过牵引离断骨段或骨缝而促进新骨生成的一项技术,目前已被广泛地应用于牙颌面畸形的矫治,并取得了显著效果。本文就牵张成骨术在正畸领域的具体应用进行综述。     

种植体支抗在口腔正畸中的应用

目的目的探讨种植体支抗在口腔正畸中的应用。方法对在我院口腔科就诊的80例安氏Ⅱ类拔牙患者采取种植体支抗的方法进行治疗,观察治疗效果。结果本组共植入种植体154个,成功149例,成功率为96.8%。失败5例,系种植体松动、脱落,原因是牙龈局部中度和重度炎症。X线头影测量分析结果显示患者的前牙内收明显,但矫治前后的骨性指标改变没有显著性。结论种植体可以提供绝对的支抗、可辅助正畸治疗。具有操作简便灵活、即刻加力、费用低廉等优点。     

Bolton指数在正畸矫治中的应用分析

理想的牙齿排列与牙弓间关系要求上下牙量协调,Bohon指数是常用的评价指标之一.但临床应用中发现许多因素影响Bohon指数对咬合关系的评价.本文就分析Bolton指数时应该全面考虑的因素进行综述,以期对临床医师应用该法有所帮助.