Methods to Predict Dental Crown Fixation Success Rates

Each year, dental crowns generate 2 billion dollars of revenue in the United States and approximately 3 percent of these crowns fail annually. Studies on human and canine teeth have shown that for a given base diameter (D) and taper (α), the taller (H) a tooth is, the more successful the fixation of the dental crown is. It has been shown that the ideal taper angle for human teeth is 1.5 to 7 degrees and values greater than that decrease the likelihood of fixation. This ideal taper angle is rarely found in canines. The aim of this study is to better understand the parameters that improve crown fixation, and determine if there is a correlation between the surface area of the tooth to receive a crown and the success rate of the crown. In this study, the surface area of 24 canine teeth molds will be calculated using a laser scanner, Geomagic and Solidworks computer software and will be correlated to the success rate of the crown that was placed on the tooth. Variance is created during the scanning process and during the creation of the 3D model in the software. Two studies were conducted to find ideal and worst-case scenario variances when calculating the surface area. These investigations into the variance of surface area calculations assisted in the creation of an effective protocol for the study to be conducted during the summer semester.

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