外伤性牙槽损伤固定方法的临床研究

目的　分析方丝弓托槽技术和牙弓夹板技术在外伤性牙槽损伤的临床应用。　方法　随机将 91例外伤性牙槽损伤需进行单颌固定的患者分为两组 ,共 134颗牙齿 ,分别采用方丝弓托槽技术和常规牙弓夹板技术固定 ,记录患者复诊过程中固定装置的稳固情况 ,以及半年后临床疗效和牙周相关指标 ,并进行统计学处理。　结果　两组患者复诊过程中固定装置稳固情况和在牙龈炎、牙周袋形成、牙槽骨吸收的改变上差异有非常显著性意义 (P <0 .0 1) ,在临床疗效评定结果上差异无显著性意义 (P >0 .0 5 )。　结论　方丝弓托槽技术是治疗外伤性牙槽损伤可靠的单颌固定方法     

Flexural properties of rectangular nickel-titanium orthodontic wires when used as ribbon archwires

Objective:To compare the flexural properties of rectangular nickel-titanium (Ni-Ti) orthodontic wires in occlusoapical and faciolingual orientations using a standardized test method.Materials and Methods:Twenty-two rectangular Ni-Ti wire groups were tested in occlusoapical (ribbon) orientation: eight conventional Ni-Ti products, five superelastic Ni-Ti products, and nine thermal Ni-Ti products (n = 10 per group). Six products of thermal Ni-Ti wire were tested in faciolingual (edgewise) orientation. A three-point bending test was performed to measure deactivation force at 3.0-, 2.0-, 1.0-, and 0.5-mm deflections of each rectangular wire at 37.0 ± 0.5°C. Analysis of variance and post hoc Student-Newman-Keuls tests were used to compare the mean values of the different groups (α = .05).Results:The ranges of deactivation forces varied greatly with different kinds, sizes, products, and deflections of Ni-Ti wires. One product of conventional and superelastic Ni-Ti wires had steeper force-deflection curves. Four products had similarly shaped flat force-deflection curves, whereas the sixth product had a moderately steep force-deflection curve. Thermal Ni-Ti wires had smaller deactivation forces ranging from 0.773 N (78.8 g) to 2.475 N (252.4 g) between deflections of 1.0 and 0.5 mm, whereas wider ranges of force from 3.371 N (343.7 g) to 9.343 N (952.7 g) were predominantly found among conventional Ni-Ti wires between deflections of 3.0 and 2.0 mm.Conclusions:Clinicians should critically select archwires for use in the occlusoapical orientation not only based on Ni-Ti wire type, size (0.022 × 0.016-in or 0.025 × 0.017-in), and product but also with deactivation deflections from 0.5 and 1.0 mm to obtain light forces in the occlusoapical orientation.     

An assessment of conventional and self-ligating brackets in Class I maxillary constriction patients

Objective:To evaluate two different treatment systems with regard to incisor position, transverse dimension changes in maxillary arch, changes in maxillary molar inclinations, clinical periodontal parameters, and pain intensity in patients with a Class I malocclusion.Materials and Methods:Seventeen patients (with a mean age of 14.5 years) underwent orthodontic treatment with the Roth prescribed edgewise bracket systems after expanding the maxillary arch with a quad-helix appliance, and 16 patients (with a mean age of 14.8 years) underwent orthodontic treatment with the Damon 3MX bracket system. Each subject''s lateral cephalometric and posteroanterior radiographs and dental casts were obtained at the beginning of the treatment and after debonding. In addition to these, the periodontal index and pain scores were taken.Results:Cephalometric data showed that in both treatment systems, overjet value decreased and maxillary and mandibular incisors proclined. Posteroanterior measurements demonstrated a greater increase in the maxillary molar inclination in the Damon group. Significant increase of maxillary intercanine, interpremolar, and intermolar widths was shown in both systems. Periodontal index and pain score changes between different observation periods were the same.Conclusions:The conventional and Damon systems were found similar with regard to the incisor position, transverse dimension changes in maxillary arch, clinical periodontal parameters, and pain intensity. The only significant difference was that the Damon system inclined the maxillary molars more buccally than the conventional group.     

Edgewise加平面导板矫治深覆颌伴拥挤的初探

通过对32例深覆颌伴拥挤的患者，采用Edgewise加平面导板进行矫治。结果表明，解除拥挤，前牙打开咬合可以同时进行，从而进一步缩短了疗程。笔者认为Edgewise加平面导板矫治方法的应用，既能在压低前牙、升高后牙的同时，又能解除拥挤，是一种快速、有效地矫治深覆颌伴拥挤的方法。     

外科翻瓣导萌术结合Edgewise技术治疗上颌埋伏阻生前牙

目的:探讨上颌埋伏阻生前牙的外科、正畸联合治疗方法。方法:32例患者42颗上颌埋伏阻生前牙,先用方丝弓固定矫治器进行间隙扩展,然后根据上颌埋伏牙的位置及与邻牙的关系,分析其阻生的原因,采用外科翻瓣导萌术,暴露埋伏牙的牙冠,粘接托槽,再选择不同的方向和方法对上颌埋伏牙进行正畸牵引导萌。结果:牵引42颗,成功41颗,失败1颗;成功者全部回复到牙列上,整个疗程6～15个月不等。7颗移位阻生牙,除2颗回复到正常位置外,其余5颗均易位排列在牙列上。对埋伏阻生牙的牙髓活力测定结果:4颗牙髓坏死,牙体变色,22颗牙髓活力减低,余均正常。结论:选择良好的适应证、准确的定位、足够的间隙、适当的牵引力,只有通过从上颌埋伏前牙的位置关系,分析其阻生的病因,选择正确的外科手术和正畸牵引导萌的方法,才能有效地矫治上颌埋伏前牙。     

多曲方丝弓技术矫治前牙开的临床应用

目的通过多曲方丝弓技术矫治前牙开,研究颌面部硬组织变化,评价其临床效果。方法前牙开患者10例,其中男4例,女6例,年龄范围13～22岁,用多曲方丝弓进行矫治,治疗前后进行X线头影测量的分析比较。结果10例前牙开患者均取得满意疗效。结论多曲方丝弓技术治疗开具有疗效显著,疗程短,适应症广泛的优点。     

多曲方丝弓技术矫治前牙开[牙合]的临床应用

目的通过多曲方丝弓技术矫治前牙开[牙合],研究颌面部硬组织变化,评价其临床效果。方法前牙开牙合患者10例,其中男4例,女6例,年龄范围13～22岁,用多曲方丝弓进行矫治,治疗前后进行X线头影测量的分析比较。结果10例前牙开[牙合]患者均取得满意疗效。结论多曲方丝弓技术治疗开[牙合]具有疗效显著,疗程短,适应症广泛的优点。     

用上颌平面导板协助方丝弓矫治器打开咬牙合的初步探讨

目的　研究打开前牙深覆牙合Ⅱ～Ⅲ度的方法。方法　选择 12例前牙深覆牙合达Ⅱ～Ⅲ度的患者 ,分别在矫治前、矫治中及方丝弓矫治器打开咬牙合失败后 ,用上颌平面导板协助打开咬合。结果　经过 3～ 8个月的时间 ,12名患者覆牙合均达正常 ( 0～ 1度 )。结论　作者认为以上颌平面导板协助以方丝弓矫治技术矫治的深覆牙合患者打开咬牙合的效果较为满意。     

Orthodontic treatment of a class II, 1 malocclusion including extractions of the 4 first molars

Orthodontic treatment of a Class II, 1 malocclusion in a 13-year-old boy is demonstrated. The first molars were extracted and an Edgewise-appliance was used.This casuistry was one of 8 cases accepted for The European Board of Orthodontics, July 1997.     

改良固定反式双阻板矫治器矫治成人前牙反[牙合]对颅面软组织的影响

目的探讨临床应用改良固定反式双阻板矫治器（twin-block appliance，TBA）联合方丝弓技术治疗成人AngleIH类前牙反[牙合]的临床应用效果。方法应用改良固定反式TBA联合方丝弓技术矫治成人前牙反[牙合]18例，对治疗前后临床表现及X线软组织测量进行分析，评价其临床矫治效果。结果下颌软组织的变化十分明显，较快改善了侧貌外形。上颌前牙适度的唇倾也对软组织侧貌改善起了一定的作用。随访病例最长的3年，无复发。结论改良固定反式TBA联合方丝弓技术，可快速有效矫治成人前牙反[牙合]，对下颌软组织的影响较大。