Computational formulation of orthodontic tooth-extraction decisions. Part II: which tooth should be extracted?
Computational formulation of orthodontic tooth-extraction decisions. Part II: which tooth should be extracted?
复制标题
正畸拔牙决策的计算公式。
DOI：
10.2319/081908-439.1
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
K. Takada
中科院分区：
文献类型：
--
作者：
M. Yagi;H. Ohno;K. Takada
目的
建立一个模拟最佳拔牙部位的数学模型，并研究模型中哪些类型的牙骨特征影响拔牙部位的优化决策。
材料和方法
193名接受正畸拔牙治疗的妇女获得了传统的正畸记录，这些妇女被认为治疗效果良好。确定了代表牙骨特征的特征向量元素，以及它们对模型中实现最佳模拟的贡献的权重。
结果
优化后的模型所提建议与实际判断的符合率为86.0%。在判断拔牙部位时，对增加符合率和相应权重敏感的因素有：上下切牙的弯曲（2.0），覆盖和覆牙合（1.5）、隶属度为骨性II类颌骨关系、磨牙矢状方向关系、下颌平面角、和下牙列拥挤的严重程度（1.0）。其余10个特征矢量元素也被认为是不可或缺的模型。
结论
建立了一个模拟正畸拔牙最佳部位的数学模型，系统的推荐与正畸医生的实际判断符合率高达86.0%。将影响正畸拔牙位点优化决策的牙骨结构特征分为5大类，即矢状面牙骨与软组织关系、垂直面牙骨关系、横向牙关系、牙弓内条件和病理条件。
OBJECTIVE
To develop a mathematical model that simulates optimum site(s) for tooth extraction and to examine what kinds of dentoskeletal traits, in the model, influence optimizing decisions for extraction site(s).
MATERIALS AND METHODS
Conventional orthodontic records were obtained for 193 women who had received orthodontic tooth-extraction treatments judged as excellent treatment outcomes. The feature vector-elements that represented dentoskeletal traits, and weights of their contributions to achieving optimum simulation in the model, were determined.
RESULTS
The rate of coincidence between recommendations made by the optimized model and the actual judgments was found to be 86.0%. The elements that were sensitive to increasing the rate of coincidence and corresponding weights in judging the site(s) of tooth extraction were: protrusiveness of the upper and lower incisors (2.0), overjet and overbite (1.5), the membership grade for the skeletal Class II jaw relationship, molar relationship in the sagittal direction, the mandibular plane angle, and the severity of tooth crowding in the lower dentition (1.0). The remaining 10 feature vector-elements were also found to be indispensable for the model.
CONCLUSIONS
A mathematical model that simulates optimum site(s) for orthodontic tooth extraction, with a high agreement rate (86.0%) between the system's recommendations and the actual judgments given by orthodontists, was developed. The dentoskeletal structural traits that affected optimizing decisions for orthodontic tooth-extraction site(s) were formulated and subdivided into five major categories, ie, the sagittal dentoskeletal and soft tissue relationship, the vertical dentoskeletal relationship, the transverse dental relationship, the intra-arch conditions, and the pathological conditions.
DOI：
10.1016/s0889-5406(96)70121-x
发表时间：
1996-04-01
影响因子：
3
作者：
Baumrind, S;Korn, EL;Maxwell, R
通讯作者：
Maxwell, R
正畸中的软组织限制：治疗计划指南。
DOI：
10.1043/0003-3219(1997)067
发表时间：
1997
期刊：
The Angle orthodontist
影响因子：
--
作者：
Ackerman,JL;Proffit,WR
通讯作者：
Proffit,WR