Influence of Cusp Inclination and Type of Retention on Fracture Load of Implant-Supported Crowns

Autor(es)

Cibele Oliveira de Melo Rocha ^[1] ; Diogo Longhini ^[2] ; Rodrigo de Paula Pereira ^[3] ; João Neudenir Arioli Filho ^[4]

Afiliação do(s) autor(es)

^[1] Universidade Estadual Paulista - Brasil

^[2] Universidade Estadual Paulista - Brasil

^[3] Universidade Estadual Paulista - Brasil

^[4] Universidade Estadual Paulista - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Dental Journal; v. 28, n. 1, p. 92-96, 2017-02-00.

Resumo

Abstract There are few informations about the influence of cusp inclination on the fracture strength of implant-supported crowns. The study aimed to evaluate the influence of cusp inclination and retention type on fracture load in implant-supported metal-ceramic single crowns. Sixty crowns were made, classified as cemented and screw-retained with screw access hole (SAH) sealed or not. Standard (33°) and reduced (20°) cusp inclinations were tested for each group (n=10). To support crowns of a mandibular second molar, analogs of external hexagon implants 5.0 were used. The fracture load was measured in a universal testing machine EMIC DL2000 (10 kN load cell; 0.5 mm/min). Two-way ANOVA (retention and cusp inclination) followed by post hoc Tukey’s honest significant difference test was used for the statistical analyses (a=0.05). Crowns with reduced cusp inclination exhibited significantly higher fracture load (p<0.01) than crowns with standard cusp inclination. Cemented crowns showed significantly higher fracture load (p<0.01) than screw-retained crowns. The interaction among these factors was not significant (p>0.05) for the fracture load. The sealing of SAH did not influence the fracture load of screw-retained crowns (p>0.05). In conclusion, fracture load of implant-supported metal-ceramic crowns was influenced by retention and cusp inclination, and there was no influence of the sealing of SAH. (AU)

• Processo FAPESP: 13/01119-1 - Influência da inclinação das cúspides na resistência de coroas metalo-cerâmicas cimentadas e parafusadas sobre implantes
• Beneficiário: Cibele Oliveira de Melo Rocha
• Modalidade de apoio: Bolsas no Brasil - Mestrado