Effect of Preparation Surface Area on the Clinical Outcome of Full Veneer Crowns in Dogs

Abstract

Crown therapy is commonly used in veterinary medicine to provide support to teeth which have previously fractured, received root canal therapy, have significant wear, or experienced other detrimental removal of tooth substance. As with several aspects of veterinary medicine, many of the recommendations or guidelines for crown therapy originate from human dentistry, which are then transferred to veterinary patients. Due to the significant difference in the anatomy of teeth and function of the oral cavity between humans and dogs, these guidelines need to be studied to determine the appropriateness of their use in veterinary patients. This article evaluates the relationship between surface area of the preparation and clinical outcome of full veneer crown therapy of the canine tooth in dogs. Although there appeared to be a positive relationship between preparations with greater surface area and successful clinical outcome, it was not found to be statistically significant.

Evaluation of the Natural Crown Convergence Angle of Dog Carnassial Teeth

“…6,9 Crown surface area is determined by the natural tooth crown morphology including CA, height, and diameter. 6,9 Crown surface area is determined by the natural tooth crown morphology including CA, height, and diameter.…”

“…6,9 Crown surface area is determined by the natural tooth crown morphology including CA, height, and diameter. 6,8,18 The results of this study suggest that in order to achieve the ideal CA for the carnassial teeth in dogs, significant axial wall reduction would be required. 6,8 Because the operator has control over the dimensions of auxiliary features, the implementation of these features may provide an opportunity to introduce an internal CA that is lower, and thus more effective, than the tooth's natural convergence angle.…”

“…[1][2][3][4] Few controlled studies evaluating the influence of the unique morphology of dog teeth pertaining to the biomechanics and retention features of crown therapy have been published. 5,6,[8][9][10] These factors need to be considered when determining the ideal CA for dog teeth. Retention of a restoration is greater when the preparation has a smaller convergence angle (CA).…”

<b>Avaliação clínica de próteses dentárias metálicas em felídeos selvagens mantidos em cativeiro</b>

“…Nos dentes de polpa morta e tratamento endodôntico, o canal pode ser utilizado como retenção, fazendo com que a prótese tenha uma porção dentro do canal (pino radicular). Quando há pouca ou nenhuma substância coronal após fraturas, não há possibilidade de restaurar-se a coroa com amálgama, resinas ou ionômero de vidro, por falta de suporte mecânico (FECCHIO et al, 2014;RIEHL et al, 2014). Algumas regras são importantes no preparo, de acordo com Visser (1998) e Soukup (2013):…”

“…O planejamento cuidadoso e a avaliação do ângulo cavo impede o desenvolvimento de prismas do esmalte sem suporte, com o potencial de fratura. Ao mesmo tempo, a configuração de margem deve fornecer um ângulo de encerramento aceitável (SCHILLINGBURG, 1987;GROVE, 1990;WIGGS;LOBPRISE, 1997;VISSER, 1998;GIOSO, 2008;SOUKUP, 2013;RIEHL et al, 2014 Cada dente a ser preparado deve ser avaliado cuidadosamente para determinar qual das configurações que melhor atende a tríade de fatores biológico, estético e mecânico.…”