Quantitative Crack Surface Morphology of Bone Cements in Relation to Propagation Rate
Morphology of the crack surface of surgical bone cements has seldom been studied in the past despite the clinical relevance of cement failure. Previous studies on a specific cement type suggest that crack morphology depends on crack propagation rate. The objectives of this work were: (i) to develop a quantitative indicator for describing crack morphology; and (ii) to assess if dependency on crack-propagation rate is affected by cement formulation. Known crack surfaces were obtained from specimens under controlled loading conditions. Crack surface roughness was measured for different crack-propagation rates, and compared against the amount of cleaved pre-cured beads (measured with a semi-automated procedure based on micrographs). Such indicators were extremely robust, operator-independent, highly correlated, and sensitive to the type of fracture. Moreover, it was found that crack surface morphology heavily depends upon cement composition. Thus, crack surface roughness is proposed as a method for quantitatively identifying crack morphology, and finally classifying fracture type.
Document Type: Research Article
Affiliations: 1: Laboratorio di Tecnologia Medica, Rizzoli Orthopaedic Institutes, Via di Barbiano 1/10, 40136 Bologna, Italy 2: Applied Chemistry and Materials Science Department, Engineering Faculty, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy 3: Department of Optics and Precision Mechanics, University Ferhat Abbas, Setif, Algeria 4: Mechanical Engineering Department, Engineering Faculty, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy
Publication date: 2007-09-01