Chinese Journal of Tissue Engineering Research ›› 2014, Vol. 18 ›› Issue (25): 4068-4072.doi: 10.3969/j.issn.2095-4344.2014.25.023
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Liu Yu, Wang Pei-jun, Zhou Shan, Bai Xue-fei
Received:
2014-06-03
Online:
2014-06-18
Published:
2014-06-18
Contact:
Wang Pei-jun, the Second Affiliated Hospital of Harbin Medical University, Harbin 150000, Heilongjiang Province, China
About author:
Liu Yu, Studying for master’s degree, the Second Affiliated Hospital of Harbin Medical University, Harbin 150000, Heilongjiang Province, China
CLC Number:
Liu Yu, Wang Pei-jun, Zhou Shan, Bai Xue-fei. Comparative study of self-ligating brackets and conventional brackets: direction and progress[J]. Chinese Journal of Tissue Engineering Research, 2014, 18(25): 4068-4072.
2.1 椅旁操作时间 椅旁操作的时间是检查,弓丝拆除,弓丝弯制、放置及结扎,托槽黏结等时间的总和。20世纪90年代Turnbull等[3]和Maijer等[4]对自锁托槽与传统直丝托槽弓丝的拆除、结扎时间等进行了比较研究,结果显示自锁托槽的确可以减少椅旁时间。此后不断有学者对此进行研究,国内有刘丛华等[5]、谭忠荣等[6]对两种托槽的椅旁时间进行对比试验。自锁托槽通过锁夹或锁帽代替结扎丝或结扎圈把弓丝固定于托槽的槽沟中,因此有利于减少临床医生结扎和去结扎丝的时间,有效减少了椅旁操作时间。如Harradine[7]的研究表明,使用自锁托槽后单颌更换弓丝时间可以减少24 s。 2.2 牙周健康 固定矫治是当今国内外最常用的错牙合畸形治疗方法,但固定矫治器会使食物残渣更容易停留于口腔,增加了患者保持口腔卫生的难度。自锁托槽系统应用于临床后,有关其与传统直丝弓托槽在保持口腔卫生方面的对比研究就在不断的进行,也产生了不同的观点。与结扎丝或弹性橡皮圈相比较,自锁托槽对牙龈等牙周组织的机械和化学刺激较小,减少了感染的机会,并且自锁托槽体积较小,没有结扎丝或弹力圈的刮黏食物的作用,托槽周围更易清洁,有利于口腔卫生的维护和牙周组织的健康。Pellegrini等[8]的试验表明,大多数使用自锁托槽的患者在正畸矫治的第1周和第5周时,比用橡皮圈结扎的传统托槽在口腔内有更少的细菌产生,但同时也有其他学者表示自锁托槽与传统托槽在口腔卫生维护与牙周健康方面并没有明显的区别[9]。有关自锁托槽是否有益于患者口腔卫生维护仍是一个存在争议的研究,同时关于使用自锁托槽矫治后龋患和脱矿情况的临床研究报道较少,以前的实验仅是研究菌斑指数、牙周袋深度、探诊出血等主观性指标,因实验人员不同致判断结果不同而使实验的误差不能够避免,这也是导致争议存在的原因之一。近二三年开始有了关于自锁托槽与传统托槽对口腔内牙龈卟啉单胞菌与变形链球菌数量影响的相关研究,从客观指标上探讨自锁托槽与传统托槽对口腔卫生维护和牙周健康的影响是否有区别[10-11]。也有学者通过研究自锁托槽对牙周组织的作用来评判自锁托槽矫治器对牙周健康的影响,认为自锁托槽矫治器的使用有利于牙周组织的健康,原因有可能是自锁托槽的应用减小了矫治器系统的摩擦力,减小了矫治力,从而减小对牙周组织血管的压迫,有利于牙周组织的有氧代谢,同传统托槽的矫治器相比,更有利于牙周组织的健康[12]。正畸医生和患者要注意的是,正畸治疗中的口腔卫生维护主要还是依靠医生的卫生宣教,以及患者的主观意愿即正畸患者要保证正确的刷牙方法、刷牙时间与次数。 2.3 托槽与弓丝间的摩擦力 摩擦力在正畸治疗移动牙齿过程中是不可避免的。正畸治疗时,施加的矫治力必须克服摩擦力才能使牙齿移动,摩擦力越小矫治力越轻。传统托槽通过不锈钢结扎丝或弹性圈固定弓丝,因此加大了弓丝与托槽间的摩擦力,而自锁托槽改变了结扎方式,通过锁扣固定弓丝,减掉因结扎而增加的摩擦力。 Tecco等[13]研究得出在使用0.014英寸镍钛丝和0.016英寸镍钛丝时,托槽与弓丝间产生的摩擦力以传统托槽最大,不同型号自锁托槽产生的摩擦力也不同,以DamonM和VisionLP产生的摩擦力最小。体外研究矫治过程中使用不锈钢弓丝时,自锁托槽与传统托槽在摩擦力方面没有区别;但使用镍钛丝时,自锁托槽产生的摩擦力明显小于传统托槽[14]。正畸治疗过程中产生的摩擦力不仅包括弓丝与托槽间的滑动摩擦力,还包括弓丝与槽沟形成的角度大于临界角时产生的弓丝弹性约束力和刻痕阻力[15]。因此有关自锁托槽能够降低正畸治疗中摩擦力的观点仍存在很大争议,目前较明确的观点是,自锁托槽在使用细圆丝时的摩擦力小于传统托槽[16]。体外研究显示,自锁托槽在尖牙滑动时产生的摩擦力明显小于传统托槽[17];Choi等[18]的实验显示:在排齐整平后使用0.019×0.025不锈钢方丝时,Damon 3MX不锈钢自锁托槽在牵3向远中产生的摩擦力明显低于Kosaka不锈钢传统直丝弓托槽;但Montasser等[19]研究表明,自锁托槽在尖牙移动中的力损失并没有表现出比传统托槽更优越的性能。目前对于自锁托槽在关闭间隙与精细调节阶段产生的摩擦力是否明显小于传统托槽还未被证实,需要更多的临床对比试验。 2.4 患者疼痛感 正畸治疗中矫正器初戴安放弓丝患者通常都会感到一定程度的疼痛不适。有研究表明正畸治疗中的疼痛和不适一方面来源于牙周组织的改建,另一方面来源于正畸矫治器对软组织的机械刺激或不当操作。自锁托槽引起的牙周组织疼痛程度低于传统托槽,而引起的软组织疼痛程度高于传统托槽,这与自锁托槽制作工艺复杂、厚度较大有关[20]。Trein等[21]的实验证实戴矫治器第1天相对矫治前有明显的疼痛感觉,同时咀嚼效率下降明显。Tecco等[22]研究表明正畸导致疼痛大多发生于更换弓丝的9 d内,7-9 d后无疼痛的报告,正畸过程中的疼痛是普遍存在的,但Store[23]认为使用自锁托槽也许可以使疼痛不太激烈。对牙齿施加轻力可得到有效的生理性牙移动,并且能够减轻正畸移动牙齿过程中牙周韧带牵拉程度,从而产生更少的疼痛感。Damon等[24]研究表明,自锁托槽在整个矫治过程中的矫治力轻柔、缓和并接近最适矫治力,因而认为利用自锁托槽的低摩擦进行轻力矫治可以达到减轻正畸疼痛的目的。有实验显示在正畸治疗中使用Damon3自锁托槽患者的平均疼痛强度低于使用传统托槽患者[25]。但Atik等[26]的研究显示为,在矫治的不同时期两种矫治托槽得到的疼痛评分是相似的,没有显著区别;国内学者的研究结果显示自锁托槽Smartclip和传统托槽Victory对患者的疼痛不适程度差异无显著性意义[27]。出现此不同研究结果有可能是因为正畸治疗中的疼痛也与患者的心理、社会环境因素存在相关关系。也有学者就两种托槽在椅旁操作时即安装和拆卸不锈钢方形弓丝时患者产生的疼痛和不适感进行系统回顾研究,得出的结论为自锁托槽较传统托槽有更明显的疼痛感觉[28],是因自锁托槽在开锁时产生的瞬间力过大,使患者有明显的疼痛感,今后需要不断改进自锁托槽的技术。 2.5 牙弓宽度改变比较 Damon自锁托槽的倡导者表示,使用Damon自锁托槽可以扩大牙弓,有效解除牙列拥挤,拔牙还是不拔牙矫治取决于面部美观而非牙列拥挤度,从而减少拔牙矫治的比率,减轻患者痛苦[29]。牙弓扩展包括长度扩展和宽度扩展,是增大骨量的主要措施。其中牙弓长度扩展的方法主要有推磨牙向远中、切牙唇向移动等;牙弓宽度扩展的方法主要有腭中缝扩展、牙弓正畸扩展及牙弓-齿槽骨功能性扩展。 有研究表明自锁托槽配合镍钛弓丝在排齐阶段可以有效扩大上颌牙弓宽度与牙弓周长,有利于非拔牙矫 治[30]。研究表明自锁托槽在非拔牙矫治中牙弓长度和宽度均有明显增加,上颌宽度增加主要发生在前磨牙区,下颌宽度增加主要发生在第一和第二前磨牙区,尖牙的宽度也有增加的趋势,但没有前磨牙的明显[31]。在Ⅰ类错颌伴上颌牙弓狭窄的对比研究中,自锁托槽扩弓后的牙弓与使用扩弓器扩弓后戴用传统托槽的牙弓并没有明显区别,结果显示两者都能有效增加牙弓宽度,都存在上下颌切牙唇倾,并且自锁托槽的磨牙颊倾更明显[26]。同时有关自锁托槽在矫治不拔牙患者中产生的类似快速扩弓效果,能否能保持长期稳定尚无研究报道[32]。有学者应用Peer Assessment Rating(PAR)指数测量了自锁托槽技术及直丝弓技术的临床应用效果,显示效果均理想[33]。1992年Richmond等发展了一种专门用于测量治疗后牙、颌改变来评价正畸治疗结果的方法-PAR指数。也有研究表明对于拥挤的下颌牙弓使用相同弓丝的自锁托槽和传统托槽,在排齐下颌牙列后磨牙间的宽度并没有明显差异,同时测得的尖牙宽度变化也相似[34]。自锁托槽在矫治不拔牙病例中确实具有扩大牙弓宽度与增加牙弓周长、解除牙列拥挤的作用,并优越于传统托槽,但将其与传统托槽进行对比实验所得的结果是否具有统计学意义仍存在不同结论。 2.6 矫治时间 拥挤牙列的排齐是多颗牙齿沿弓丝滑动的过程,弓丝与槽沟间的摩擦力越低这种相对运动越顺畅。自锁托槽矫治器能降低摩擦力水平,使得正畸医生可以使用持续的最接近生理性的轻矫治力更加迅捷地移动牙齿,相应减少复诊次数,从而被认为有助于快速解决拥挤[35]。Baccetti等[36]认为,使用自锁托槽可以缩短排齐阶段和精细调节阶段的时间,从而减少矫正时间。非拔牙患者下颌牙列拥挤为中度及小于5 mm时,使用自锁托槽的排齐速度较传统托槽快2.7倍[37]。因此,临床应用中认为矫治前期应用自锁矫治器提供了轻力矫治,从而减少牙齿排齐整平时间,提高矫治效率。 拔牙患者使用Damon3自锁托槽并不比传统直丝弓托槽在牙齿排齐阶段矫治更有效率,其排齐速度受牙列拥挤度的影响与托槽类型无明显关联[38]。Saporito等[39]的Typodont模型实验显示,在关闭拔牙间隙阶段,自锁托槽及传统托槽与0.016×0.022不锈钢弓丝组合关闭拔牙间隙的效率无显著差异。da Costa Monini等[40]的实验显示,自锁托槽19.19个月的治疗时间与用不锈钢丝结扎的传统托槽21.25个月的矫治时间没有统计上的显著差异。因此,有关自锁托槽矫治器较传统矫治器能显著缩短整个错颌畸形矫治时间的观点尚需进一步研究。 2.7 牙根吸收 随着自锁托槽在世界的应用越来越多,有关自锁托槽的研究又有新方向:轻力矫治除了提高矫治效率还能减少牙根吸收的发生或减轻其程度,以更接近生理性的牙槽骨改建代替相对缓慢的潜倔性骨吸收,加快牙齿移动速度,实现牙槽骨与牙齿的同步矫治[41]。牙根外吸收指牙根变钝或变短,为正畸治疗的常见并发症之一[42]。Jacobs等[43]的实验使用美国3M公司的Smartclip自锁托槽和Victory Series传统托槽矫治前后切牙牙根吸收的数量百分比和吸收程度对比研究发现,牙根吸收的百分比没有差异,牙根吸收程度也没有统计学意义(自锁托槽0.3,传统托槽0.5),此实验采用的是全颌曲面断层测量,全颌曲面断层片为非定位摄片:牙齿变形较大,不同牙位形变率也不同,当使用等级频数来反映全口牙列牙根外吸收情况时,希望所使用的X射线技术能包含全部的牙齿信息,牙根影像重叠少,因此二维方向的测量有可能存在误差。Leite等[44]的实验采用CBCT扫描和三维重建矫治前和矫治6个月后的上下切牙牙根,发现正畸治疗后所有的牙均有明显吸收,但牙根的吸收程度与托槽设计没有关系。牙根吸收的相关临床因素包括矫治器类型、弓丝材料、矫治力大小、矫治力持续时间、牙齿移动类型、牙齿移动距离、拔牙与非拔牙矫治、治疗时间等。由于多种因素的影响使得实验变得困难,因此有关此项的研究较少,就目前研究结果表明自锁托槽在牙根吸收方面无优势,但也不能做出明确的结论,而是需要更多的体内与体外对比研究。 2.8 支抗丧失 在各种类似远中牵引尖牙的牙齿移动中,低摩擦力可以降低牵引力,这样后牙区受到的相互牵引力也相应减小,同样的力量可使前牙移动而后牙不移动或移动较少,有助于支抗的保护。同时轻力牵引也减少了弓丝发生形变而阻碍滑动、增加摩擦力的可能,同样起到保护支抗的效果[45]。有研究表明,牵引尖牙远中移动3 mm后,Damon SL托槽侧支抗丧失较传统托槽侧少,节省0.3 mm后牙支抗[46]。但近年的研究显示不同结果,在拔除第一前磨牙病例中使用150 g NiTi拉簧力牵引尖牙向远中移动的结果显示,自锁托槽与传统托槽间磨牙支抗丧失没有明显区别[47]。da Costa Monini等[43]的实验选用自锁托槽与传统托槽矫治Ⅰ类错颌畸形拔除4个第一前磨牙配合使用100 g镍钛拉簧力,每4周复诊的对比研究发现,两种矫治器有同样的磨牙支抗丧失,同时磨牙前倾角度也不存在明显区别。自锁托槽减少支抗丧失的理论确实存在,但其在临床应用中因受多种因素的影响,目前的研究表明自锁托槽的实际作用与传统托槽无统计学意义。"
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