Shahroudi Atefe Saffar, Etezadi Tahura
Assistant Professor, Dental Research Center, Tehran University of Medical Sciences, Department of Orthodontics, School of Dentistry, Lorestan University of Medical Sciences, Khoram-Abad, Iran.
J Dent (Tehran). 2013 Nov;10(6):522-31. Epub 2013 Nov 30.
Dental arch form is one of the most important characteristics of dentition. However, this dimension usually receives less attention in diagnosis or treatment planning and orthodontic patients are traditionally classified with regard to their sagittal characteristics. The objectives of this study were to investigate if a relationship exists between the dental arch width (transverse dimension) and sagittal skeletal and dental parameters in orthodontic patients.
Dental casts and lateral cephalograms of 108 consecutive untreated Iranian patients (47 males and 61 females) between 16 and 31 years of age were evaluated. Arch width (AW) parameters including upper and lower inter-molar width (UIMW and LIMW) and upper and lower inter-canine width (UICW and LICW) were measured by a digital caliper. Sagittal parameters included SNA and SNB angle and Wits' appraisal obtained from lateral cephalograms in addition to upper and lower arch length (UAL and LAL) obtained from dental casts. The correlation between the aforementioned parameters was evaluated applying Pearson correlation coefficients. Molar and canine relationship according to Angle's classification was also recorded and the means of all parameters were compared between three occlusal relationship classes and two gender groups by means of two-way ANOVA.
According to statistical analysis a significant positive correlation between sagittal parameters and arch width measures exists between SNA and UICW and between LICW and LAL. Upper and lower ICW were significantly correlated, the relationship between upper and lower IMW and between UAL and LAL were significant. Among sagittal measures, both UAL and LAL were correlated with the ANB angle. The means of arch width parameters in three occlusal classes were not significantly different.
The only significant correlation between arch width and sagittal parameters existed between UICW and SNA angle and between LICW and LAL. No significant difference of the arch width parameter was observed between the three occlusal classes.
牙弓形态是牙列最重要的特征之一。然而，这一维度在诊断或治疗计划中通常较少受到关注，正畸患者传统上是根据其矢状面特征进行分类的。本研究的目的是调查正畸患者的牙弓宽度（横向维度）与矢状面骨骼及牙齿参数之间是否存在关联。
对108例年龄在16至31岁之间未经治疗的伊朗患者（47例男性和61例女性）的石膏模型和头颅侧位片进行评估。使用数字卡尺测量牙弓宽度（AW）参数，包括上下磨牙间宽度（UIMW和LIMW）以及上下尖牙间宽度（UICW和LICW）。矢状面参数包括从头颅侧位片获得的SNA和SNB角以及Wits值，此外还包括从石膏模型获得的上下牙弓长度（UAL和LAL）。应用Pearson相关系数评估上述参数之间的相关性。还记录了根据安氏分类法的磨牙和尖牙关系，并通过双向方差分析比较了三种咬合关系类别和两个性别组之间所有参数的均值。
根据统计分析，矢状面参数与牙弓宽度测量值之间存在显著正相关，SNA与UICW之间以及LICW与LAL之间存在显著正相关。上下ICW显著相关，上下IMW之间以及UAL与LAL之间的关系也显著。在矢状面测量中，UAL和LAL均与ANB角相关。三种咬合类别的牙弓宽度参数均值无显著差异。
牙弓宽度与矢状面参数之间唯一显著的相关性存在于UICW与SNA角之间以及LICW与LAL之间。三种咬合类别之间未观察到牙弓宽度参数的显著差异。
