Prediction of arch length based on intercanine width

Abstract

Arch length (AL), intercanine width (ICW), and intermolar width (IMW) are essential for diagnosis and treatment planning and are closely related factors in orthodontics. The aim of the present study was to determine correlations between these measurements and to predict some of these measurements based on others. The dental casts of 197 Spanish patients (119 females and 78 males) with a mean age of 18 years (11-26 years) in the permanent dentition attending the Orthodontic Department of the University of Valencia, Spain, were selected. ICW, IMW, and AL on each dental cast were measured using a previously tested digital method. Correlation between variables was determined using Pearson's correlation coefficient. Linear regression analysis was applied and the 95 per cent confidence intervals (CIs) for slope and intercept were determined. The data showed very high correlations between ICW and AL, both for the upper and lower arches and for males and females, r = 0.925. This coefficient was very close to 1, indicating a linear relationship. The regression equation for AL and ICW was AL = 1.36 ICW + 29.39 for both arches. There was very high correlations between AL and ICW for the upper and lower arches and a regression equation between both magnitudes was established indicating that the size of one factor can be predicted by knowing the other. For an increase of 1 mm in ICW, the AL increases approximately 1.36 mm with a 95 per cent CI (1.30-1.42).

Influence of Myofunctional Therapy on Upper Intercanine Distance

“…Similar values are reported for nontreated patients by Paulino [12], Forster [26] and Tibana [27], who also showed that this measurement commonly is stable in adults over a period of 7 years.…”

“…This parameter was chosen, because the canine-distance is more convenient to measure during the daily clinic routine of an orofacial myologist rather than the intermolar distance. Yet it gives significant information about the dental arch development [12,14].…”

“…By defining the maxillary transverse bone dimension, masticatory muscles can also influence the upper intercanine width, which again can give information about the arch length and inter-molar width [12].…”

<p>A New Method for Prediction of Dental Arch Perimeter</p>

“…The type of method that is the focus of this study is a mathematical one that uses multiple regression analysis to develop an equation for estimating arch perimeter, as described by Sanin et al, 22 Paulino et al 23 and Al-Khatieeb et al 24 This method involves analysis of the relationship between arch lengths, widths, and perimeters.…”

“…This equation is believed to be accurate. In 2008, Paulino et al 23 proposed a regression equation that utilized inter-canine width to predict arch perimeter (referred to as arch length in their article): Arch length (perimeter) = (1.36 × inter-canine width) + 29.39. In 2014, Al-Khatieeb et al 24 tried to predict arch perimeter based on dental arch width at the level of each tooth: 35.…”