Development of orthodontic appliance without pain and the practice

无痛正畸矫治器的研制与实践

• 批准号: 17592154
• 负责人: NODA Koji
• 金额: $ 2.21万
• 依托单位: Tsurumi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17592154/
• 关键词: ratchet bracket; orthodontic appliance; interrupted force; optimal force; pain; periodontal ligament; tooth movement

The ratchet bracket that was designed in this research project has a ratchet mechanism, where interrupted orthodontic force induces by a ratchet mechanism built into the bracket. The operation of the bracket is to push the ratchet rod into the tube, tooth movement of 0.25mm in one the operation, every 4 days. The character of the force induced is moving distance-dependent, and the compressed periodontal ligament (PDL) does not degenerate during tooth movement, because of a slight tooth movement within 0.25mm does not prevent the blood circulation. In this project, the bracket was improved and designed compactly, 3.3×4.6mm in size, as same as the standard size, with thought to be less discomfort.In the experiment using rat upper molars, the interrupted force that defined as one third of the PDL width was used in 4days interval during tooth movement. No degenerating tissue was seen in the compressed PDL, and pathological root resorption was rarely seen during tooth movement. In addition marked bone formation was seen in the tension side.In practical use for patients, the following results were obtained : 1) No patient claimed about pain or discomfort during tooth movement by the bracket. 2) The tooth movement occurred smoothly, except the case that the bracket did not function by operation error or the failure of the ratchet spring. 3) Root resorption was not seen in patients, while a slight resorption was seen the apexes of upper incisors in one patient.From these results, a method of tooth movement by repeating the interrupted force that induced by the moving distance within PDL width preserve PDL tissue without compressive degeneration, and it is suggested that the ratchet bracket is a style of optimal tooth movement with a biological safe.

棘轮在此捕获物中设计的棘轮支架具有棘轮机构ISM的架子，支架的操作是向棘轮杆的操作，牙齿的牙齿运动为0.25mm，一个操作，强迫的特征是移动的依赖性，压缩的牙周韧带（PDL）在牙齿移动过程中产生，由于0.25mm之内的轻微移动并不能阻止该项目的血液循环，因此将支架改进并紧凑地设计为3.3×4.6mm，尺寸t.in。使用大鼠上层磨牙的经验，在牙齿运动中很少见到牙齿运动过程中的三分之一的宽度宽度间隔。 ，获得以下结果：1）在托架中没有伴随牙齿运动时疼痛或不适的患者在患者中没有看到度假胜地，而小度的度假胜地则是通过被pdl宽度内的移动距离诱导的一种牙齿运动的方法带有Al保险箱。

项目成果

A new idea and method of tooth movement using a ratchet braclet

利用棘轮支架进行牙齿移动的新思路和新方法

• 发表时间: 2007
• 期刊: European Journal of Orthodonties (in proof)
• 作者: Koji Noda;Yoshiki Nakamura;Takashi Oikawa;et al.
• 通讯作者: et al.

Tooth movement limited to periodontal ligament width using interrupted orthdontic force

使用间断正畸力将牙齿移动限制在牙周膜宽度内

• 发表时间: 2006
• 期刊: Orthodontic Waved Vol. 65・No. 2
• 作者: Koji Noda;Yoshiki Nakamura;Takashi Oikawa;Ayao Hirashita
• 通讯作者: Ayao Hirashita

A new idea and method of tooth movement using a ratchet bracket

利用棘轮托槽移动牙齿的新思路和新方法

• 期刊: European J Orthod (In press)
• 作者: Noda K;Nakamura Y et al.
• 通讯作者: Nakamura Y et al.

Tooth movement limited to periodontal ligament width using interrupted orthodontic force

使用间断正畸力将牙齿移动限制在牙周膜宽度范围内

• 发表时间: 2006
• 期刊: Orthodontic Wave 65
• 作者: Noda K;Nakamura Y et al.
• 通讯作者: Nakamura Y et al.

A new idea and method of tooth movement using a ratchet bracket.

使用棘轮托槽进行牙齿移动的新思路和新方法。

• 期刊: European J Orthod (In press)
• 作者: Noda K;Nakamura Y et al.
• 通讯作者: Nakamura Y et al.