上颌固定矫治器联合下颌He垫及颏兜矫治恒前牙反He

目的：探讨矫治恒前牙反He的方法。方法：将50例恒前牙反He患者分为两组,用固定矫治器和活动矫治器矫治,观察解除反He所需的时间。结果：结果显示固定矫治组疗程明显于活动矫治组。结论：对于恒前牙反He患者,可以用固定矫治器联合下颌He垫、颏兜矫治,缩短疗程,达到理想治疗效果。     

不同正畸方式对患者唾液中变形链球菌和乳杆菌水平的影响CSCD

目的 探讨配戴隐形矫治器和固定矫治器的患者唾液中变形链球菌和乳杆菌的水平及其他唾液指标,为该类患者的治疗提供参考。方法 本研究共纳入80名患者并分为两组,其中隐形矫治器组患者[n=40,(20.4±1.7)岁]采用隐形矫治器治疗,固定矫治器组患者[n=40,(21.3±1.7)岁]采用固定矫治器治疗。正畸治疗开始前(t0)、正畸治疗第3个月(t1)和正畸治疗第6个月(t2)分别评估牙菌斑指数、唾液缓冲能力、唾液流量以及唾液中变形链球菌和乳杆菌的水平。结果 隐形矫治器组患者的菌斑指数随着时间的推移始终维持在0级,而固定矫治器组患者的菌斑指数随着时间的推移呈显著上升趋势。此外,在t2时,37.5%的固定矫治器组患者出现变形链球菌水平的增加及乳杆菌水平的增加(均P<0.05)。结论 与固定矫治器组相比,隐形矫治器治疗的受试者在治疗6个月后唾液微生物数量较低。不同矫治器类型治疗时必须采用不同的菌斑及微生物控制方式。     

Begg矫治器和直丝弓矫治器联合治疗安氏Ⅱ类1 分类错颌畸形的临床 疗效分析

目的:探讨Begg矫治器和直丝弓矫治器联合治疗安氏Ⅱ类1分类错颌畸形的临床疗效。方法:采取回顾性分析方法,调阅2010-2013年徐州矿务集团总医院安氏Ⅱ类1分类错颌畸形患者病历资料,选择病历资料完整且符合本研究要求的正畸病人病历44例进行分析,实验组22例为Begg矫治器和直丝弓矫治器联合治疗组,对照组22例为单纯直丝弓治疗组。对治疗前后的头影测量片进行扫描分析,对治疗时间及辅助支抗应用情况进行统计分析。结果:治疗完成时,Begg矫治器和直丝弓矫治器联合治疗组和单纯直丝弓治疗组的前牙覆合覆盖均减少,上切牙切缘均向远中移动,上下磨牙均伸长,前下面高度均增加,两组治疗结束后硬组织的变化无统计学差异(P0.05)。Begg矫治器和直丝弓矫治器联合治疗组与单纯直丝弓治疗组相比,治疗时间短,使用辅助支抗少,差异具有统计学意义(P0.05)。结论:Begg矫治器和直丝弓矫治器联合矫治安氏Ⅱ类1分类错颌畸形是临床上一种速度快,费用低,效果优的治疗方法。     

钕铁硼永磁体与双阻板矫治器矫治Angle Ⅲ类错(牙合)

目的:观察双阻板矫治器基础上使用钕铁硼永磁体矫治AngleⅢ类错牙合的效果.方法:15例替牙及恒牙早期AngleⅢ类错牙合畸形患者,男6例,女9例.年龄9-13岁,平均11-25岁.在双阻板矫治器的上下阻板安放第三代高磁能积稀土永磁体钕铁硼,矫治过程中磁块间距的增加说明疗效,间距加1mm以上考虑加力.治疗前后头颅侧位片及常规头影方法进行分析.结果:与矫治前相比,矫治后ANB角,Ao-Bo距,NA-PA角均增大,差异有统计学意义(P<0.01).SNB角减小,差异有统计学意义(P<0.01).结论:磁力双阻板矫治器克服了传统矫形装置的缺点,从而能获得持续的矫形力,磁力调整易于控制,便于临床开展.     

钕铁硼永磁体与双阻板矫治器矫治AngleⅢ类错[牙合]

目的：观察双阻板矫治器基础上使用钕铁硼永磁体矫治AngleⅢ类错[牙合]的效果。方法：15例替牙及恒牙早期AngleⅢ类错[牙合]畸形患者,男6例,女9例。年龄9-13岁,平均11.25岁。在双阻板矫治器的上下阻板安放第三代高磁能积稀土永磁体钕铁硼,矫治过程中磁块间距的增加说明疗效,间距加1mm以上考虑加力。治疗前后头颅侧位片及常规头影方法进行分析。结果：与矫治前相比,矫治后ANB角,Ao—Bo距,NA—PA角均增大,差异有统计学意义（P〈0.01）。SNB角减小,差异有统计学意义（P〈0．01）。结论：磁力双阻板矫治器克服了传统矫形装置的缺点,从而能获得持续的矫形力,磁力调整易于控制,便于临床开展。     

成年人个别牙早失伴错(牙合)畸形修复前正畸治疗的临床观察

目的:探讨成年人个别牙缺失伴错牙合患者,通过正畸治疗校正错牙合后,修复治疗的疗效情况。方法:对16例成年人个别牙缺失致前牙散在间隙或伴有反牙合患者,采用直丝弓矫治技术进行修复前正畸治疗。结果:16例成年人个别牙缺失伴错牙合畸形的患者经过修复前正畸治疗后,再进行牙列缺损修复治疗,获得了令患者较为满意的疗效,外貌也得到了改善。结论:通过正畸、修复相结合的口腔综合治疗,可以有效地使便利体获得更加完善的口腔功能及美观效果。     

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。     

再论正常颌位总义齿前牙排列的关系——临床调查及有限元法探讨

关于正常颌位总义齿前牙排列的(牙合)关系,长期来传统观点的常规排列均为正中(牙合)时其上下前牙应呈1mm浅覆(牙合)的(牙合)接触关系,而且要求上下中切牙的唇舌向位排成垂直或稍微唇向位,因此临床长期来总义齿前牙排成覆盖极小的1mm浅覆(牙合)的上下前牙呈紧密的面接触关系。1980年Heinlein还提出应建立前牙的正中(牙合)接触起前导(Anterior Guidance)作用,可保护后牙免受偏斜接触。但近年来有提出不同观点,1980年前Zarb等提出正中(牙合)时相对的上下前牙间不应有任何     

应用16S rDNA检测固定矫治患者牙周可疑病原菌变化研究

应用16S rDNA检测固定矫治患者龈下菌斑中牙周可疑病原,探讨戴用固定矫治器对牙周组织健康的影响。随机选择36例治疗时间超过6个月的固定矫治患者组成实验组,29例未经正畸治疗者组成对照组。分别检验特定部位牙周临床指数并收集龈下菌斑样本。采用16S rDNA检测9种牙周可疑致病菌。实验组与对照组相比牙龈指数、牙周袋深度、探诊出血差异有明显统计学意义(P<0.05);牙周可疑病原菌中牙龈卟啉菌、齿垢密螺旋体在实验组的检出率明显高于对照组(P<0.05)。固定矫治器戴入可引起患者牙周可疑病原菌的明显变化。     

无托槽隐形矫治器与固定矫治器对牙周病正畸治疗患者龈下菌群、龈沟液炎症因子和氧化应激的影响

摘要 目的：对比固定矫治器与无托槽隐形矫治器对牙周病正畸治疗患者龈沟液炎症因子、龈下菌群和氧化应激的影响。方法：选取2016年1月～2021年10月于河北省眼科医院口腔正畸科接受正畸治疗的112例牙周病患者,根据矫治器的不同分为对照组（固定矫治器,n=54）和实验组（无托槽隐形矫治器,n=58）。对比两组牙周健康指标、龈下菌群、龈沟液炎症因子、氧化应激指标和疼痛评分的变化情况。结果：两组矫治10个月后牙龈指数、菌斑指数、龈沟出血指数、牙周探诊深度下降,且实验组低于对照组（P<0.05）。实验组矫治10个月后牙龈卟啉单胞菌（Pg）、具核梭杆菌（Fn）、福塞斯坦氏菌（Tf）和中间型普里沃菌（Pi）含量低于对照组（P<0.05）。两组矫治10个月后肿瘤坏死因子-α（TNF-α）、白细胞介素-6（IL-6）、白细胞介素1β（IL-1β）下降,且实验组低于对照组（P<0.05）。两组矫治10个月后丙二醛（MDA）、活性氧（ROS）水平下降,且实验组低于对照组;超氧化物歧化酶（SOD）升高,且实验组高于对照组（P<0.05）。两组矫治1 d、7 d后疼痛视觉模拟评分（VAS）评分升高后下降,且实验组低于对照组（P<0.05）。结论：无托槽隐形矫治器与固定矫治器对牙周病正畸治疗患者均有较好的疗效,其中无托槽隐形矫治器在改善牙周健康指标、龈下菌群、龈沟液炎症因子和氧化应激等方面的效果较为显著。     

固定矫治器戴入前后牙周可疑病原菌和牙周临床指数的变化

目的:固定矫治器戴入前后的不同时间进行龈缘菌斑的微生物学检查和牙周状况的临床检查,以探讨固定矫治器戴入前后牙周可疑病原菌和牙周状况的动态变化过程.方法:选择18名固定正畸患者,于矫治器戴入前和戴入后1、3、6月分别检查16、41牙位的菌斑指数、牙龈指数、探诊深度、探诊出血,并在近中颊侧颊轴角处采集龈缘菌斑样本,采用细菌培养鉴定方法测定牙周可疑病原菌的检出量(CFU/g)和检出率.结果:与基线相比,观察期内龈缘菌斑的G￣产黑色素厌氧杆菌检出量和检出率在两个牙位均升高(P＜0.05),41的优杆菌、弯曲杆菌、拟杆菌、普氏菌亦有升高(P＜0.05).临床指标中16的牙龈指数(颊侧)和探诊深度(颊、舌侧)升高;41的菌斑指数(舌侧)降低(P＜0.05).结论:固定矫治器戴入后虽然可通过严格的口腔卫生指导有效控制牙面菌斑,但仍可引起牙周可疑病原菌增加.     

GMD 应用于安氏II 类错牙合非拔牙矫治的临床分析

目的:探讨安氏Ⅱ类错非拔牙矫治中GMD矫治器的疗效和适应症。方法:选择36例恒牙早期安氏Ⅱ类病例,主要表现为以乳磨牙早失形成的磨牙近移或上牙列轻中度拥挤的的非拔牙患者为研究对象,通过运用GMD推磨牙装置远移磨牙开辟后牙间隙。结果:36例患者中除1例因上切牙唇倾致患者对面形不满意而改行拔牙矫治外其余患者均取得了较好的疗效。第一磨牙平均远移5.6mm,远移到位平均4-5个月。磨牙建立中性关系。结论:GMD装置是一种快速有效的推磨牙向后的矫治器,但要掌握好适应症才能取得成功。     

Chewing pattern and muscular activation in open bite patients

Different studies have indicated, in open bite patients, that masticatory muscles tend to generate a small maximum bite force and to show a reduced cross-sectional area with a lower EMG activity. The aim of this study was to evaluate the kinematics parameters of the chewing cycles and the activation of masseters and anterior temporalis muscles of patients with anterior dental open bite malocclusion. There have been no previous reports evaluating both kinematic values and EMG activity of patients with anterior open bite during chewing. Fifty-two young patients (23 boys and 29 girls; mean age±SD 11.5±1.2 and 10.2±1.6years, respectively) with anterior open bite malocclusion and 21 subjects with normal occlusion were selected for the study. Kinematics parameters and surface electromyography (EMG) were simultaneously recorded during chewing a hard bolus with a kinesiograph K7-I Myotronics-Usa. The results showed a statistically significant difference between the open bite patients and the control group for a narrower chewing pattern, a shorter total and closing duration of the chewing pattern, a lower peak of both the anterior temporalis and the masseter of the bolus side. In this study, it has been observed that open bite patients, lacking the inputs from the anterior guidance, that are considered important information for establishing the motor scheme of the chewing pattern, show narrower chewing pattern, shorter lasting chewing cycles and lower muscular activation with respect to the control group.     

GMD应用于安氏II类错[牙合]非拔牙矫治的临床分析

目的：探讨安氏11类错[牙合]非拔牙矫治中GMD矫治器的疗效和适应症。方法：选择36例恒牙早期安氏Ⅱ类病例,主要表现为以乳磨牙早失形成的磨牙近移或上牙列轻中度拥挤的的非拔牙患者为研究对象,通过运用GMD推磨牙装置远移磨牙开辟后牙间隙。结果：36倒患者中除1例因上切牙唇倾致患者对面形不满意而改行拔牙矫治外其余患者均取得了较好的疗效。第一磨牙平均远移5．6mm,远移到位平均4—5个月。磨牙建立中性关系。结论：GMD装置是一种快速有效的推磨牙向后的矫治器,但要掌握好适应症才能取得成功。     

Effects function simulation of residential appliance field exposures

This paper demonstrates the application of effects function analysis to residential magnetic field exposure, focusing on appliance sources and mitigation choices. Residential field exposure time series were synthesized by using a sample of background household field measurements, a model of average daily appliance use, and a small sample of EMDEX data of field exposure from 12 household appliances. Four alternative effects functions (average field strength with or without a threshold, field strength window, sudden field changes) were simulated by using the synthesized time series data for different exposure situations, such as high and low levels of appliance use, simple avoidance, and use of a set of hypothetical “low field” appliances (50% lower fields). In particular, field exposure from the use of bedside clocks and electric blankets was examined. Results demonstrate that the choice of effects function is critical for the ranks of field sources and exposure reduction choices. For the effects function of average field strength with or without a threshold, exposure from background fields dominated exposure from all appliances except for bedside clocks and electric blankets. In the case of the field strength window effects function, the dominant field sources changed with the width of the window. For the effects function based on rapid field changes, appliance use was the major source of exposure. Because of the small sample size of our data set and other simplifications, specific results should be viewed as illustrative. Bioelectromagnetics 18:116–124, 1997. © 1997 Wiley-Liss, Inc.     

Labial talon cusp on maxillary central incisors: a rare developmental dental anomaly

Labial talon cusp, or dens evaginatus is a very rare dental anomaly of unclear etiology and significance. It can occur as an isolated finding or be associated with other dental anomalies or some syndromes. The present report describes two Caucasian males with labial talon cusp on maxillary permanent left central incisors. In both cases accessory cusp caused plaque accumulation and marginal gingivitis. One case displayed affected tooth to be in cross bite position causing occlusal trauma. No other dental anomalies in either case, neither association with some syndromes were noted. This rare anomaly requires careful dental and physical examination of the affected patient since its finding can be of clinical and genetic significance.     

Time-Dependent Effects of a Functional'-Type Orthopedic Appliance on the Rat Mandible Growth

The modus operandi and the time-dependent variations in the effects of the LSU-activator, an orthopedic appliance currently used in human orthodontic therapy, was experimentally analyzed in growing rats. This appliance causes a forward positioning of the lower jaw and a restriction of mandibular motility. After a 4-week treatment, the following changes were observed:

(i) the growth rate of the condylar cartilage was accelerated, this growth-promoting effect being more pronounced when the LSU-activator was worn during the animal's rest span.

(ii) the direction of condylar growth became more backward-oriented; no significant difference between day and night treatment, i.e. during the rest and activity spans could be detected;

(iii) the supplementary lengthening of the mandible was greater in rats treated during rest than in rats treated during waking and

(iv) the number of serial sarcomeres in the lateral pterygoid muscle was smaller. This growth retardation of the muscle was greater in rest-time than in waking-time treated individuals.

The LSU-type activator's action implies a two-step effect: during the time of wearing the appliance, the more forward positioning of the mandible causes a reduced growth of the lateral pterygoid muscle; during the time the LSU-type activator is not worn, the mandible is functioning in a more forward position in such a way that it stimulates the growth rate of the condylar cartilage and the subperiosteal ossification of the posterior border of the ramus. It is therefore essential, for a few hours every day, that the mandible be allowed to move freely from the appliance in a more forward position.