Department of Orthodontics, Saveetha Dental College & Hospital, Saveetha Institute of Medical and Technical Sciences, Saveetha University, 162 Poonamallee High Road, Chennai, 600 077, Tamil Nadu, India.
Department of Oral Medicine, Saveetha Dental College & Hospital, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, Tamil Nadu, India.
Oral Maxillofac Surg. 2024 Sep;28(3):1169-1179. doi: 10.1007/s10006-024-01229-y. Epub 2024 Mar 14.
To determine the influence of the presence/absence of third molars and intact/loss of cortical plate of the maxillary tuberosity on the amount of distal movement of the maxillary first permanent molar during distal movement of the maxillary dentition with mini-implants.
Thirty six maxillary tuberosity sites were evaluated in eighteen young adult patients. The distal movement of the entire maxillary dentition was performed with mini-implants with 200 g of distalising force applied from the mini-implant placed in the maxillary posterior buccal region to attachments placed on the arch wire between the maxillary lateral incisor and canine bilaterally. The distal movement of the maxillary first permanent molars was measured on lateral cephalograms. The maxillary tuberosity sites with intact cortical plate due to congenitally missing third molars or atraumatic extraction of third molars (G1), partial loss of cortical plate due to surgical removal of third molars (G2), fully erupted third molars (G4), third molars located at (G3), and below the cementoenamel junction (G5) were evaluated with cone beam computed tomography. One way Anova and Fisher LSD test was done.
The order of greater to lesser amount of distal movement of the maxillary first permanent molar depending on the integrity of maxillary of tuberosity was partial loss of cortical plate, third molars at the cementoenamel junction, third molars below the cementoenamel junction, intact cortical plate and fully erupted third molars.
The integrity of the cortical plate and the relative position of the maxillary third molar to the second molar influence the amount of distal movement of the maxillary first permanent molar during distal movement of the maxillary teeth with TADS.
The amount of distal movement of the maxillary dentition appears to depend on the presence or absence of the third molars and the condition of the cortical plate in the region of the maxillary tuberosity and thereby greatly influence the outcome of treatment.
确定上颌结节皮质板完整/缺失和第三磨牙存在/缺失对上颌第一恒磨牙远中移动量的影响。
在 18 名年轻成年患者中评估了 36 个上颌结节部位。通过在上颌后颊部的微型植入物上施加 200 克的远移力，使整个上颌牙列向双侧上颌侧切牙和尖牙之间的弓丝上的附件远移，从而实现上颌牙列的远移。在上颌侧位头颅片中测量上颌第一恒磨牙的远中移动量。使用锥形束计算机断层扫描对上颌结节皮质板完整（由于先天缺失第三磨牙或第三磨牙微创拔除）（G1）、皮质板部分缺失（由于第三磨牙外科切除）（G2）、完全萌出的第三磨牙（G4）、位于（G3）和釉牙骨质界以下的第三磨牙、及第三磨牙（G5）的上颌结节部位进行评估。采用单因素方差分析和 Fisher LSD 检验。
根据上颌结节皮质板完整性，上颌第一恒磨牙远中移动量从大到小的顺序为皮质板部分缺失、釉牙骨质界处的第三磨牙、釉牙骨质界以下的第三磨牙、皮质板完整和完全萌出的第三磨牙。
皮质板的完整性和上颌第三磨牙相对于第二磨牙的位置影响 TADS 远移上颌牙齿时上颌第一恒磨牙的远中移动量。
上颌牙列的远中移动量似乎取决于第三磨牙的存在与否以及上颌结节区域皮质板的状况，从而极大地影响治疗效果。
