舌侧集中[牙合]与三次印模法在全口义齿制作中的临床效果评价

目的:评价制作全口义齿时采用3次印模法配合舌侧集中[牙合]的临床效果。方法:纳入80例低平牙槽嵴患者,随机分为40例实验组(三次印模法)和40例对照组(二次印模法),所有患者均接受舌侧集中[牙合]治疗。在不同时间点,分别对义齿咀嚼效率、患者满意度、义齿基托密合性的指标进行统计分析。结果:实验组在义齿稳定性、咀嚼效率优于对照组(P<0.05),而在美观、发音方面2组间无明显统计学差异(P>0.05)。结论:3次印模法配合舌侧集中[牙合]在修复低平牙槽嵴患者中具有更好的修复效果。     

数字化技术在可摘局部义齿基牙全瓷冠崩瓷后再修复中的应用1例

数字化技术有助于提升可摘义齿基牙再修复的精准性及简便性,避免患者重行可摘义齿修复或利用旧活动义齿行手工堆塑基牙冠形态造成的误差,报告1例数字化技术在可摘局部义齿基牙全瓷冠崩瓷后再修复中的应用,取得了满意的治疗效果。     

种植体掺离子表面改性技术及其促进骨结合的研究进展

种植牙因其在解决牙列缺损方面巨大的优势,已成为许多缺牙患者首选的治疗方式。在临床应用中,如何促进种植体与骨组织界面的骨结合是种植治疗成功的关键,因此种植体表面改性一直是研究的热点。骨组织中含有钙、磷、锌、镁、锶等大量微量元素,这些微量元素对于骨组织的生长发育必不可少。因此可以通过将微量元素掺入种植体表面来促进种植体骨结合。本文着重介绍了种植体表面改性的相关技术以及微量元素促进骨结合的具体机制。     

种植导板精度非放射学评价方法的建立与应用评价

目的: 利用数字化印模技术建立种植导板精度的非放射学评价方法,评估体外全程导航手术的种植精度。方法: 利用3Shape Implant Studio软件,在15个相同的缺牙树脂模型中设计2颗平行种植体位点,生成并打印相应的数字化种植导板并在导板全程导航下植入2颗种植体。术后分别以传统放射学方法及数字化印模杆、口内扫描仪、通用逆向工程软件构成的数字化评价方法检测每组种植体偏移情况,采用SPSS 23.0软件包进行数据分析。结果: 以数字化评价方法得到的全程种植导板平均精度为肩部偏差0.447 mm,根尖部偏差0.557 mm, 角度平均偏差1.134°。与传统放射学评价方法相比,2种评价方法在距离偏差方面无统计学差异（P>0.05）;在角度偏差分析中,数字化评价方法更优（P<0.05）。种植体偏差多集中在冠根方向,且根尖偏移较颈部偏移更明显。结论: 与放射学评价手段相比,数字化非放射学评价方法可准确评价种植精度,有效减少患者辐射暴露。     

Effect of repeated use of an implant handpiece on an output torque: An in-vitro study

PURPOSEThis study aimed to evaluate the effect of repeated use of an implant handpiece under an implant placement torque (35 Ncm) and overloading torque condition (50 Ncm) on an output torque.MATERIALS AND METHODSTwo types of implant handpiece systems (Surgicpro/X-DSG20L [NSK, Kanuma, Japan] and SIP20/CRB46LN [SAESHIN, Daegu, South Korea]) were used. The output torque was measured using a digital torque gauge. The height and angle (x, y, and z axes) of the digital torque gauge and implant handpiece were adjusted through a jig for passive connection. The experiment was conducted under the setting torque value of 35 Ncm (implant placement torque) and 50 Ncm (overloading torque condition) and 30 times per set; a total of 5 sets were performed (N = 150). For statistical analysis, the difference between the groups was analyzed using the Mann-Whitney U test and the Friedman test was used to confirm the change in output torque (α=.05).RESULTSNSK and SAESHIN implant handpieces showed significant differences in output torque results at the setting torques of 35 Ncm and 50 Ncm (P<.001). The type of implant handpiece and repeated use influenced the output torque (P<.001).CONCLUSIONThere may be a difference between the setting torque and actual output torque due to repeated use, and the implant handpiece should be managed and repaired during long-term use. In addition, for successful implant results in dental clinics, the output torque of the implant handpiece system should be checked before implant placement.     

Intermittent administration of parathyroid hormone improves bone quality and quantity around implants in rat tibiae

ObjectivesIntermittent injection of parathyroid hormone (PTH) is used to treat osteoporosis. The concept of bone quality was updated 20 years ago; however, these updates have not been adopted in implant dentistry. This study aimed to investigate the effects of intermittent administration of PTH on bone quality around implants in rat tibiae.MethodsGrade IV-titanium-threaded implants that were 3.5 mm long and 2.0 mm wide were placed in a randomly selected side of the proximal tibiae of 12-week-old female Wistar rats. Three weeks after implant placement, the rats were randomly divided into PTH-administration and saline-injection groups (PTH and VC, respectively; n = 7 per group). Micro-computed tomographical, histomorphometric, and immunohistochemical analyses were performed to evaluate bone quality and quantity surrounding the implants.ResultsPTH significantly increased bone volume and bone mineral density in bones not associated with the implants as compared to these values in the VC group. PTH significantly increased bone area and the amount of collagen within the total inside areas of all implant threads compared to that observed in VC. Moreover, PTH significantly increased the number of osteoblasts, osteocytes, and osteoclasts in the total inside and/or outside areas of all implant threads and altered the ratio of type I and III collagen to total collagen fibers.ConclusionsWithin the limitations of this study, intermittent administration of PTH improved both bone quantity and bone quality based on the types and numbers of bone cells and the types of collagen fibers surrounding implants placed into rat tibiae.