3D Printed Customized Facemask for Maxillary Protraction in the Early Treatment of a Class III Malocclusion: Proof-of-Concept Clinical Case

In order to improve fit and comfort, a maxillary protraction facemask customized to the patient’s anatomy was produced by means of 3D face scanning, digital design and additive manufacturing. An 8-year-old patient in need of early treatment for the Class III malocclusion received a rapid palatal expander and a Petit-type facemask, whose components were digitally designed on a 3D scan of the patient’s face. For face scanning, the iPad Pro 2018 tablet (Apple, Cupertino, CA, USA) with the Bellus3D DentalPro application (Bellus3D, Campbell, CA, USA) was used. Facemask components were modelled with 3D Blender software. The rests were 3D printed in BioMed Clear biocompatible resin (Formlabs, Somerville, MA, USA), and the bar in stainless steel. For greater comfort, the internal surface of the rests was lined with a polymer gel pad (Silipos, Niagara Falls, NY, USA). The manufacturing procedure of the customized facemask is patented. The patient wore the facemask at night for a period of 9 months. The patient’s experience was evaluated with a questionnaire at 1 week, 3, 6, and 10 months of treatment. The customized facemask was well accepted by the patient and obtained the expected treatment outcome. Furthermore, 3D face scanning, 3D modelling and 3D printing allow for the manufacturing of customized facemasks with improved fit and comfort, favoring patient compliance and treatment success.     

厦门市聋哑学生错(牙合)情况调查分析

目的 了解厦门地区聋哑学生错He畸形的患病情况及相关因素。方法 对厦门聋哑学校270名学生与正常学生对照组同时进行错He情况调查及分析。结果 聋哑组错He畸形患病率60．0％（其中男性占39．3％，女性占20．7％）。恒牙期He率42．2％，替牙期错He率17．8％，舌系带过短率8．2％，唇系带异常率6．7％。健康组错He畸形患病率62．3％，舌系带过短率6．6％，唇系带异常率4．8％。结论 两组错He畸形，舌系带过短，唇系带异常率差异均无显著性（P＞0．05）。唇舌系带过短，错He畸形与聋哑残疾障碍无相关。聋哑群体的错He畸形，应同样受到人们的重视和关注。     

Twin-block矫治安氏Ⅱ类错合畸形临床疗效观察

目的分析采用Twin-block矫治安氏Ⅱ类错合畸形的临床疗效。方法回顾性分析2007年5月～2010年6月在我院确诊的安氏Ⅱ类错颌畸形患者38例,对治疗前后的上下切牙位置、前牙覆盖情况、磨牙关系以及上下颌骨的变化进行对比分析。结果 Twin-block矫治可以明显促进下颌骨发育,改善外观,治疗后上切牙平均后移2.8 mm,下切牙平均前移2.6 mm,前牙覆盖平均减少4.9 mm。结论Twin-block矫治安氏Ⅱ类错合畸形效果确切,不但可以有效地利用下颌骨向前生长的潜力,而且可以使下颌前移,以致下颌磨牙前移,改善Ⅱ类磨牙关系,同时可以使唇向上切牙舌向移动,进一步改善深覆盖状况,是一种安全有效的方法,值得临床大力推广。     

OPA-K滑动直丝弓矫治器在错雅合畸形病人中的应用

①目的了解OPA-K滑动直丝弓矫治器的临床应用特点.②方法收集错雅合畸形病人15例(包括Angle分类Ⅰ类8例,Ⅱ类5例,Ⅲ类2例),采用OPA-K滑动直丝弓矫治器治疗,观察治疗结果,分析OPA-K滑动直丝弓矫治器的临床应用特点.③结果 15例病人均取得满意疗效,矫治时间10～20个月,平均15.8个月;间隙关闭时间6～13个月,平均7.5个月.④结论 OPA-K滑动直丝弓矫治器可用于各类错雅合矫治,具有轻力滑动移动牙齿、有效支抗控制、简化弓丝程序等突出特点.     

安氏Ⅱ类人群下颌侧方(牙合)干扰的情况分析

目的研究安氏II1类人群在下颌左右侧方运动过程中的接触情况,探讨侧方干扰情况的存在与否及其与牙颌颅面形态之间的关系。方法对60名未经过正畸治疗的安氏II1类受试者进行检查,采用T-ScanII咬合分析系统记录并分析其侧方运动中的接触情况,在模型及头颅侧位片上分析牙颌颅面的形态,利用SPSS12.0对数据进行分析。结果双侧侧方干扰和无侧方干扰在A-ptm、U1-SN、上下前段牙弓的长度、磨牙近远中向指数上存在差异。结论上颌骨长度与侧方干扰的发生呈负相关,较小的A-ptm是干扰发生的危险因素;磨牙尖对尖关系较完全远中关系更容易发生侧方干扰。     

夜磨牙症的临床分析

本文对50名夜磨牙者及50名对照者进行错(牙合)和口颌系统功能检查,结果表明两组间在错(牙合)的发生率无差别,各种错(牙合)类型在两组间的分布也相似,夜磨牙对口领系统的损害常以咀嚼肌症状先表现,而颞下领关节症状出现较晚。     

丝圈式和铸造式间隙保持器的临床应用和疗效分析

目的:研究乳磨牙早失儿童使用丝圈式和铸造式间隙保持器后,两者在保持缺牙间隙方面的作用。方法:将60例下颌第一乳磨牙早失患者随机分为佩戴丝圈式间隙保持器组、戴铸造式间隙保持器组和不戴保持器的对照组,测量治疗前后缺隙处距离。结果:两个试验组缺牙间隙无明显改变或间隙稍微增加,而未佩戴保持器的对照组间隙则明显减小,2者之间的差异具有显著性(P<0.05)。佩戴铸造式间隙保持器和丝圈式间隙保持器2组患者缺牙间隙的差异无显性(P>0.05)。结论:对于乳磨牙早失患者尽早佩戴间隙保持器,可以有效减少错畸形的发生。     

A simple approach to blood gas analysis: the essentials

ABSTRACT

Blood gas analysis allows you to assess a patient's acid-base status as well as important aspects of respiratory function. Understanding the results might seem challenging initially, but the information can often be lifesaving if properly interpreted. One common cause of misunderstanding is the vague use of terminology, which this article aims to clarify. Portable and bench-top analysers are becoming more common in veterinary practice so it is even more important that RVNs know how to interpret the results.     

微种植体支抗治疗成人骨性安氏Ⅱ类错殆的疗效评估

目的：探讨微种植体支抗治疗成人骨性安氏Ⅱ类错殆的临床效果。方法：回顾性分析我院2011年8月～2014年7月收治的85例成人骨性安氏Ⅱ类错殆患者,所有患者均应用微种植体支抗技术进行治疗,比较患者治疗前后的投影测评结果。结果：治疗后,患者面部美观情况显著改善,磨牙在水平向和垂直向均未发生明显移动,而 U1-SN、U1-NA 及 LS-EP 则比治疗前显著减小,U1-L1、U1-SN 比治疗前明显增大。结论：微螺钉种植体是一个疗效确切的成人骨性安氏Ⅱ类错殆治疗技术,具有良好的应用前景。