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Successful Treatment of Postpeak Stage Patients with ClassⅡ Division 1 Malocclusion Using Non-extraction and Multiloop Edgewise Archwire Therapy: A Report on 16 Cases 被引量:1
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作者 Jun Liu Ling Zou +4 位作者 Zhi-he Zhao Neala Welburn Pu Yang Tian Tang Yu Li 《International Journal of Oral Science》 SCIE CAS CSCD 2009年第4期207-216,共10页
Aim To determine cephalometrically the mechanism of the treatment effects of non-extraction and multiloop edgewise archwire (MEAW) technique on postpeak Class Ⅱ Division 1 patients. Methodology In this retrospectiv... Aim To determine cephalometrically the mechanism of the treatment effects of non-extraction and multiloop edgewise archwire (MEAW) technique on postpeak Class Ⅱ Division 1 patients. Methodology In this retrospective study, 16 postpeak Class Ⅱ Division 1 patients successfully corrected using a non-extraction and MEAW technique were cephalometrically evaluated and compared with 16 matched control subjects treated using an extraction technique. Using CorelDRAW software, standardized digital cephalograms preand post-active treatments were traced and a reference grid was set up. The superimpositions were based on the cranial base, the mandibular and the maxilla regions,and skeletal and dental changes were measured. Changes following treatment were evaluated using the paired-sample t-test. Student's t-test for unpaired samples was used to assess the differences in changes between the MEAW and the extraction control groups. Results The correction of the molar relationships comprised 54% skeletal change (mainly the advancement of the mandible) and 46% dental change. Correction of the anterior teeth relationships comprised 30% skeletal change and 70% dental change. Conclusion The MEAW technique can produce the desired vertical and sagittal movement of the tooth segment and then effectively stimulate mandibular advancement by utilizing the residual growth potential of the condyle. 展开更多
关键词 CEPHALOMETRY Class Division 1 malocclusion mandibular advancement multiloop edgewise archwire(MEAW) non-extraction postpeak stage
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Double archwire在青少年深覆牙合矫正中临床应用
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作者 宫平 沈兰花 姜辉 《黑龙江医药科学》 2014年第6期100-101,共2页
目的:探讨在深覆牙合病例矫治过程中,应用double archwire在治疗中期压低上颌前牙的临床效果,评价其对上颌前牙压低的有效性。方法:选择患者牙列排齐后仍具有前牙Ⅱ以上深覆牙合的患者25例,用Double archwire进行上颌前牙压低治疗。治... 目的:探讨在深覆牙合病例矫治过程中,应用double archwire在治疗中期压低上颌前牙的临床效果,评价其对上颌前牙压低的有效性。方法:选择患者牙列排齐后仍具有前牙Ⅱ以上深覆牙合的患者25例,用Double archwire进行上颌前牙压低治疗。治疗前后分别拍取头颅定位侧位X线片,测量项目包括上颌中切牙和第一磨牙矢状向和垂直向变化,以及前牙咬牙合关系变化。统计学处理采用SPSS17.0软件包对头影测量的数据进行分析。P<0.05被设定为差别有统计学意义。结果:(1)SNA、SNB、MP-SN、FH-MP、N-Me、S-Go和U6-PP测量项目在使用Double archwire方法压低前后数值变化无统计学意义(P>0.05)。(2)U1-SN、U1-PP和OB测量项目在使用Double archwire方法压低后,三个项目的数值较压低前均明显变小,压低前后数值差异有统计学意义(P=0.016,0.035,0.021)。结论:1Double archwire在上颌纵颌曲线不正常的情况下,能有效的压低上前牙不升高磨牙。2Double archwire适用于高角或倾向于高角的深覆牙合的患者。 展开更多
关键词 深覆牙合 高角型 DOUBLE archwire
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Mechanical properties of nickel-titanium archwire used in the final treatment phase of Tip-Edge Plus technique: an in vitro study 被引量:3
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作者 SHEN Xiao SUN Xin-hua +3 位作者 TIAN Hua ZHANG Chun-bo YAN Kuo GUO Yong-liang 《Chinese Medical Journal》 SCIE CAS CSCD 2013年第1期135-139,共5页
Background As the only active component in final treatment phase of Tip-Edge Plus technique, the activation of nickel-titanium orthodontic archwires is one of the factors that affect the torque expression. It is neces... Background As the only active component in final treatment phase of Tip-Edge Plus technique, the activation of nickel-titanium orthodontic archwires is one of the factors that affect the torque expression. It is necessary to evaluate the mechanical properties of the nickel-titanium wire used in the final treatment phase in simulated oral environments to forecast the treatment outcomes. Methods The mechanical properties of 171 thermal nickel-titanium wires of 0.35 mm (0.014-in) in diameters with different deflection of 40 mm in length were investigated with three-point bending test. The samples were divided into 2 groups: as-received and bended groups. In the bended group, samples were divided into 7 subgroups according to the amounts of deflection and named by the canine angulations (-25~, -19~, -13~, -7~, -1~, +5~, +11~). The deflection of wires was made by inserting the wires into the deep tunnel of Tip-Edge Plus brackets positioned in plaster casts with different canine angulations to mimic the use of nickel-titanium wires in the final treatment phase. Immersed the bended group in artificial saliva (pH 6.8) and preserved at 37.0~C. Eight durations of incubation were tested: 1 to 8 weeks. Three analogous samples of each group and subgroups were tested per week. Stiffness (YS:E) and the load-deflection characteristics of unloading plateau section were obtained. Results Significant changes in specific mechanical properties were observed in long-term immersed and large deflected wires compared with as-received groups. Both immersion time and deflection affected the mechanical properties of wires in the simulated oral environment, and the two factors had synergistic effect. In groups -25~, -19~ and -13~, stiffness (YS:E) increased then decreased and average plateau force and ratio of variance decreased then increased correspondingly at specific time. Conclusions In the final treatment phase of Tip-Edge Plus technique, the mechanical properties of nickel-titanium wire are associated with the using time and amounts of deflection and it may affect treatment outcomes. As the main reason for wire deflection, canine crown angulation plays an important role in the wire performance. It may be wise to focus on the canine crown angulations and using time in clinic with Tip-Edge Plus technique and make proper adjustment to help to make sure the treatment outcomes. 展开更多
关键词 Tip-Edge Plus archwires NICKEL-TITANIUM three-point bending test crown angulation
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