Quantitative Comparison of Mathematical Models to Measure Surface Area of Canine Teeth Prepared to Receive Full Veneer Crowns in Dogs.

Caitlyn J Collins,Jason W Soukup,Heidi-Lynn Ploeg,Sarah Siverling,Scott Joseph Hetzel

doi:10.3389/fvets.2015.00031

Caitlyn J Collins, Jason W Soukup + Show 3 more

Open Access

https://doi.org/10.3389/fvets.2015.00031

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Abstract

This study was performed in order to determine if mathematical modeling of the canine teeth in dogs could be utilized to provide an accurate and reliable estimation of crown surface area that could be used in both a research and a clinical setting. Actual surface area (aSA) calculations for 32 stone dies of clinical crown preparations were acquired utilizing a tridimensional (3D) laser scanner and 3D computer-aided design and manufacturing (CAD/CAM) software applications. These calculations were used as a control. Seventeen unique mathematical models from eight geometric shapes were used to calculate estimated surface area (eSA) of each stone die. Linear association and agreement between eSA and aSA calculations were assessed with multiple statistical methods. All methods of eSA showed a significant linear association with aSA. Five of the mathematical models [right elliptical frustum (H3), right elliptical cone (G3), right pyramidal cone (A3), right circular frustum (F2), and right circular cone (E1)] were superior to the other 12 models. The H3 mathematical model based on the right elliptical frustum provided the most accurate estimate of crown surface area of dog teeth. However, H3 requires the use of laser scans and a 3D CAD software program. As a result, this model would be recommended for research applications. The E1 mathematical model was similar in accuracy to H3 and, given it requires only two measurements and a comparatively simple equation for calculation, this method would be recommended for clinical chair-side use.

Highlights

There are several principles pertaining to tooth preparation that contribute to the long-term success of a full veneer crown
The non-uniform rational B-spline (NURBS) surfaces were saved as the computer-aided design (CAD) geometry format Initial Graphics Exchange Specification (IGES)
In a second study conducted by the same author, the same mathematical model of a right pyramidal frustum was used to investigate the influence of axial grooves on the overall SA [13]

Summary

Introduction

There are several principles pertaining to tooth preparation that contribute to the long-term success of a full veneer crown. One of these principles is the consideration of retention and resistance form [1]. There are few features, which contribute to retention and resistance form that are under operator control. Studies on human and dog teeth have shown that for a given base diameter and convergence angle, the greater the height of a tooth the more likely it is to have retention and resistance form. For a given base diameter and height, a greater convergence angle leads to a lower likelihood of obtaining sufficient retention and resistance form [2, 3]

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