Fracture origins in twenty-two dental alumina crowns

Journal of the Mechanical Behavior of Biomedical Materials
Marit Øilo, George D Quinn

Abstract

The causes of in vivo fractures of all-ceramic dental crowns are not yet fully understood. The fracture origins often occur in the cervical margin in the approximal area, but the reason for this is unclear. The aim of this study was to evaluate the fracture origin of 22 of clinically-failed alumina crowns. The fracture surfaces of alumina crowns fractured in vivo were inspected by optical microscopy to evaluate the fracture patterns and identify the cause of fracture. Fracture maps were constructed as needed to interpret the patterns of breakage and to back track to a fracture origin area. A scanning electron microscope (SEM) was used to characterize the fracture origins of the 22 cases where the origin site was available. The most common fracture origins were marginal defects either in the alumina core or in the veneer. The defects included thin, chipped, cracked or uneven crown margins and excess veneer on the inside of the crown. Multiple flaws were present along the margins in most specimens, but fracture origins were usually located in the region of the shortest axial wall. A few crowns had pores, contamination, or incomplete sintering that acted as fracture origins. Production method, handling, design and material insuffi...Continue Reading

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Citations

May 25, 2016·Journal of Biomechanics·Sadia NasrinStanislav I Rokhlin
Jan 21, 2017·Journal of Dental Research·S NasrinS I Rokhlin
Oct 13, 2018·Journal of Prosthodontics : Official Journal of the American College of Prosthodontists·Helena M MinyéUNKNOWN National Dental PBRN Collaborative Group
Nov 24, 2018·European Journal of Oral Sciences·Anneli SkjoldMarit Øilo
Aug 25, 2020·International Journal of Dentistry·Niwut Juntavee, Sasiprapa Kornrum
Sep 18, 2020·Biomaterial Investigations in Dentistry·Cathrine Å KarlsenMarit Øilo
Oct 4, 2020·Journal of Prosthodontics : Official Journal of the American College of Prosthodontists·Niwut JuntaveeSasiprapa Kornrum
Dec 31, 2020·Dental Materials : Official Publication of the Academy of Dental Materials·Jasna CotičPeter Jevnikar
Mar 26, 2021·Journal of Prosthodontic Research·Giovanni Tommaso RoccaIvo Krejci
Apr 30, 2021·Dental Materials : Official Publication of the Academy of Dental Materials·Christian SchriwerMarit Øilo
Aug 1, 2021·Dental Materials : Official Publication of the Academy of Dental Materials·Marit ØiloKetil Kvam
Aug 28, 2021·Biomaterial Investigations in Dentistry·Julia LubauerUlrich Lohbauer

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