背景:这项研究旨在验证Bolton\对牙齿尺寸比的值,并使用精确的数字测量方法评估与不同咬合特征的可能关系。
方法:包括来自三个数字研究中心的1000名连续选择的患者,使用OnyxCeph软件进行部分自动化模型分析。测量值包括用于计算前牙宽度(AR)和总比率(OR)的百分比,拱宽度,长度,周边,喷射机,过位,毫米空间分析和角度分类的评估。
结果:与Bolton的77.2%(AR)和91.3%(OR)相比,AR和OR显着增加。在性别比较中,男性患者表现出较大的牙齿尺寸比,尤其是在ORII/1和II/2类患者的牙齿尺寸比III和I类患者的牙齿尺寸比更小。因此,角度II/1级患者在所有上颌牙齿中具有最大的牙齿直径,角度II/2级患者在下颌骨中具有最小的牙齿尺寸。在AngleIII类患者组中观察到下颌的最大牙齿宽度。此外,从AR/OR到过喷的负相关,过位,检测到下颌的可用空间以及与上颌的可用空间呈正相关。
结论:牙齿大小比与目前的颌下障碍以及其他正畸相关的咬合特征之间存在明显的相关性。关于我们的患者的这种先验知识对于创建个性化治疗计划并实现足够的闭塞极为重要。为了通过正确的过喷和过咬来实现功能良好的咬合,重要的是上颌和下颌牙齿的大小成比例。在牙齿大小方面与理想患者的任何偏差,number,形状,在治疗前的治疗计划中必须结合现有的颌下障碍来考虑或弓,以便能够在治疗后对治疗进行适当调整的情况下实现稳定的前后闭塞。
BACKGROUND: This
study aims to verify Bolton\'s values for
tooth size ratios and to evaluate possible relationships to different occlusal traits using precise digital measurement methods.
METHODS: Including 1000 consecutively selected patients from three
study centres a digital, partially automated model analysis was performed utilizing the software OnyxCeph. The measurements comprised tooth width for calculation of anterior (AR) and overall ratio (OR) as a percentage, arch width, length, perimeter, overjet, overbite, space analysis in millimetre and the assessment of the angle classification.
RESULTS: AR and OR were significantly increased compared to Bolton\'s ratios of 77.2% (AR) and 91.3% (OR). In the gender comparison, male patients showed larger
tooth size ratios, especially in the OR. Patients with Angle Class II/1 and II/2 had smaller tooth size ratios than patients with Angle Class III and I. Thus, patients with Angle Class II/1 had the largest tooth diameters in all maxillary teeth and with Angle Class II/2 the smallest
tooth sizes in the mandible. The largest
tooth widths in the lower jaw were observed in the Angle Class III patient group. Furthermore, a negative correlation from AR/OR to overjet, overbite, and available space in lower jaw as well as a positive correlation to available space in upper jaw was detected.
CONCLUSIONS: There is a clear correlation between the tooth size ratios and the present dysgnathia as well as other orthodontically relevant occlusal traits. This prior knowledge about our patients is extremely important to create an individualized treatment plan and enable sufficient occlusion. To achieve a functionally good occlusion with correct overjet and overbite, it is essential that the maxillary and mandibular teeth are proportional in size. Any deviation from the ideal patient in terms of tooth size, number, shape, or arch must be considered in the pre-therapeutic treatment plan in combination with the existing dysgnathia in order to be able to achieve a stable anterior and posterior occlusion with appropriate adjustments to the therapy post-therapeutically.