Machining variability impacts on the strength of a 'chair-side' CAD-CAM ceramic

Dental Materials : Official Publication of the Academy of Dental Materials
Owen AddisonG J P Fleming

Abstract

To develop a novel methodology to generate specimens for bi-axial flexure strength (BFS) determination from a 'chair-side' CAD-CAM feldspathic ceramic with surface defect integrals analogous to the clinical state. The hypotheses tested were: BFS and surface roughness (R(a)) are independent of machining variability introduced by the renewal or deterioration of form-grinding tools and that a post-machining annealing cycle would significantly modify BFS. Nominally identical disc-shaped specimens (11 mm diameter, 1.1mm thickness) were machined with identical design and operative parameters from Vita Mark II feldspathic ceramic. Six individual bur sets (Groups A-F) generated 14 specimens each. Three groups were annealed between glass transition and softening temperatures. 3D contact profilometry determined surface roughness before and following annealing and prior to BFS determination. Scanning electron microscopy was undertaken to examine machining tools and perform fractographic analyses of ceramic fracture fragments. Statistical analysis included independent and pairwise analyses of R(a)-values (P<0.05), Weibull analysis of BFS data and Pearsons correlations. Mean R(a) differed significantly between groups (P<0.01) but was unaffe...Continue Reading

References

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Dec 21, 2010·Dental Materials : Official Publication of the Academy of Dental Materials·G IsgróG J P Fleming

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Citations

Jun 19, 2014·Dental Materials : Official Publication of the Academy of Dental Materials·R D KellyO Addison
Jun 8, 2013·Dental Materials : Official Publication of the Academy of Dental Materials·Oliver SchaeferArndt Guentsch
Mar 13, 2013·Journal of the Mechanical Behavior of Biomedical Materials·X FanM J Baumann
Nov 26, 2015·Dental Materials : Official Publication of the Academy of Dental Materials·Iana L AurélioLiliana G May
May 6, 2015·Dental Materials : Official Publication of the Academy of Dental Materials·Sara FragaLiliana G May
Mar 28, 2017·Journal of the Mechanical Behavior of Biomedical Materials·C P ZucuniL F Valandro
Feb 12, 2014·Journal of Dental Research·P HooiG J P Fleming
Aug 25, 2016·The Journal of Advanced Prosthodontics·Joon-Ho Park, Yu-Sung Choi
Sep 7, 2017·The Journal of Advanced Prosthodontics·Ii-Do JeongJi-Hwan Kim
Apr 19, 2021·Dental Materials : Official Publication of the Academy of Dental Materials·Camila da Silva RodriguesLiliana Gressler May
Nov 21, 2018·Dental Materials : Official Publication of the Academy of Dental Materials·Dan L RomanykOwen Addison
Jun 5, 2021·Journal of the Mechanical Behavior of Biomedical Materials·Rafaela Oliveira PileccoMarília Pivetta Rippe
Jul 3, 2021·Journal of Prosthodontics : Official Journal of the American College of Prosthodontists·Khaled Q Al HamadNadim Z Baba

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