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

Abstract

Purpose: Dental arch length, width, and perimeter are considered to be important for the diagnosis and treatment of orthodontic cases. This study aimed to utilize dental arch width and length to create an equation for predicting dental arch perimeter. Materials and methods: Sixty-seven pairs of study models for patients with normal occlusion who received dental treatment were included in this study. Dental arch width at the level of the canines, first premolars, and first molars, in addition to dental arch length and perimeter, were measured using a digital vernier with 0.01mm accuracy. Data were subjected to step-wise regression analysis to determine the major predictors of arch perimeters and develop regression equations for both arches. The predicted arch perimeters were compared with the actual measured values using paired sample t-test. Results: For both arches, the perimeter showed a direct, moderate to strong, highly significant correlation with the length and width measurements. Findings from step-wise regression analysis indicated that there was a strong correlation between arch perimeter and the inter-canine width and arch length, which explained 67.7% of the variation in arch perimeter in the maxillary arch. In the mandibular arch, inter-molar width, inter-canine width, and arch length explained 55.1% of the variation in the dental arch perimeter. The arch perimeter values predicted from the developed equations were not significantly different from the actual values that were measured. Conclusion: New regression equations based on dental arch width and length at the level of the premolars, molars, and canines were developed to predict dental arch perimeters for both the mandibular and maxillary arches.

Assessment of arch length prediction based on CBCT measurements of inter-canine width in Egyptian population sample.

“…There were many studies showed the correlation between measurements of arch width using dental cast , [35][36][37] the highest correlation was between AL and ICW in both arches concluding that changes in one magnitude could change the other. [14][15][16]38] Our results couldn't be compared with those of Germane et al [35] where those authors found a correlation in patients with post-orthodontic treatment while our patients were have normal occlusion and don't experienced with orthodontic treatment before.…”

“…Motoyashi et al [36] also found that, the increase in arch perimeter as a result of intermolar mandibular growth, on the order of 0.37 mm, which was higher than the 0.27 described by Germane et al [35] AL-Ansari et al [16] found strong correlation between inter-canine width, inter-molar width, and arch length in the mandibular arch. [37] found that dental arch width and length had a direct, strong relationship with the dental arch perimeter.…”

“…[12] The anterior portion of the dental arch expands more than the posterior portion during maxillary sutural expansion, according to many clinicians, and this is likely due to the resistance of zygomatic buttresses, others have noticed that the mandibular arch growth follow the expansion of maxillary arch due to the effect of occlusion and changes in the extraoral tissue drape. [13,14] Some studies have been done to predict the arch length based on intercanine and intermolar width (ICW, IMW) [14][15][16] . Paulino et al [15] have given a regression equation for predicting the AL of upper and lower arch based on ICW in Spanish population, while Vaishnav et al [14] established new formula for North Gujarat population to predict AL from ICW for each arch.…”

Evaluation of the Accuracy of Digital Impressions Obtained from Intraoral and Extraoral Dental Scanners with Different CAD/CAM Scanning Technologies: An In Vitro Study

“…Landmarks were identified and drawn on the conventional stone cast with ultra-fine permanent pen marker. 23,24 The distances between the landmarks represented the measurements that were assessed in the study as follows:…”

Dental arch form and arch dimensions among a group of Egyptian children and adolescents

“…It is claimed that arch length and width are correlated to arch perimeter in both the mandibular and maxillary arches, which subsequently affect the risk of crowding among children and adolescents (Al-Khatieeb et al 2012;Al-ansari et al 2019).…”