Failure modes of Y-TZP abutments with external hex implant-abutment connection determined by fractographic analysis

Autor(es)

Basilio, Mariana de Almeida ^[1] ; Delben, Juliana Aparecida ^[1] ; Cesar, Paulo Francisco ^[2] ; Rizkalla, Amin Sami ^[3] ; Santos Junior, Gildo Coelho ^[4] ; Arioli Filho, Joao Neudenir ^[1]

Afiliação do(s) autor(es)

^[1] UNESP Univ Estadual Paulista, Araraquara Sch Dent, Dept Dent Mat & Prosthodont, BR-14801903 Araraquara, SP - Brazil

^[2] Univ Sao Paulo, Sch Dent, Dept Biomat & Oral Biol, BR-05508000 Sao Paulo, SP - Brazil

^[3] Univ Western Ontario, Schulich Sch Med & Dent, Dept Med Biophys, Med Sci Bldg, London, ON N6A 5C1 - Canada

^[4] Univ Western Ontario, Schulich Sch Med & Dent, Dept Dent, Med Sci Bldg, London, ON N6A 5C1 - Canada

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS; v. 60, p. 187-194, JUL 2016.
• Citações Web of Science: 2

Resumo

Yttria-stabilized tetragonal zirconia (Y-TZP) was introduced as ceramic implant abutments due to its excellent mechanical properties. However, the damage patterns for Y-TZP abutments are limited in the literature. Fractographic analyses can provide insights as to the failure origin and related mechanisms. The purpose of this study was to analyze fractured Y-TZP abutments to establish fractographic patterns and then possible reasons for failure. Thirty two prefabricated Y-TZP abutments on external hex implants were retrieved from a single-load-to failure test according to the ISO 14801. Fractographic analyses were conducted under polarized-light estereo and scanning electro microscopy. The predominant fracture pattern was abutment fracture at the connecting region. Classic fractographic features such as arrest lines, hackle, and twist hackle established that failure started where Y-TZP abutments were in contact with the retention screw edges. The abutment screw design and the loading point were the reasons for localized stress concentration and fracture patterns. (C) 2016 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 10/06651-5 - Análise comparativa da estabilidade da união parafusada em abutments de zircônia sobre implantes após carga cíclica
• Beneficiário: João Neudenir Arioli Filho
• Modalidade de apoio: Auxílio à Pesquisa - Regular