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Flexural resistance evaluation of pressed and milled ceramic laminates

Grant number: 14/13575-4
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): September 01, 2014
Effective date (End): August 31, 2015
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal researcher:Ana Flávia Sanches Borges
Grantee:Suellen Scarcelli Senna
Home Institution: Faculdade de Odontologia de Bauru (FOB). Universidade de São Paulo (USP). Bauru , SP, Brazil


The minimally invasive dentistry is based on the principle of choosing the most conservative treatment, which is associated with lower healthy tooth structure removal as possible. This considered, ceramic laminates preparations consist in a well-established therapeutic approach, capable of delivery excellent esthetic results and preserving the biological structures. In this context, lithium disilicate reinforced ceramics have adequate mechanical properties, chemical resistance, biocompatibility, reduction in plaque accumulation, margin precision and good esthetics. Associating the optical characteristics of lithium disilicate reinforced ceramics with the high esthetic demand of the patients, a technique was developed using a veneering technique with a glass ceramic over a lithium disilicate structure, having as goal to improve the esthetic result with this type of work. However, there are few studies in the literature up to date, which assessed the flexural strength differences of milled and pressed reduced thickness lithium disilicate reinforced ceramic veneers, as well as the comparison with the veneering technique using a glass ceramic coverage. In order to evaluate these aspects, eighty ceramic specimens will be prepared following the manufacturer's recommendations and distributed according to the production method (n = 20), to perform the flexural resistance test: DLI = 0.6mm thickness pressed monolithic lithium disilicate ceramic (IPS E -max); DLP = 0.6mm milled monolithic lithium disilicate ceramic (IPS e-max CAD); DLIR = G1 with 0.4mm thickness + 0.2mm thickness glass ceramic veneer ceramic; DLPR = G2 with 0.4mm thickness + 0.2mm thickness glass ceramic veneer ceramic. These ceramics will be cemented on 4mm thickness composite resin (Z100), simulating a substrate with close to dentin resilience. This system will be adapted to a 3 point load device and will be tested on an universal testing machine with crosshead speed of 0.5 mm/min until specimen fracture. For statistical analysis, considering results normality, a 2 way variance analysis (ANOVA) will be applied; if the results are not approved in normality test, the Kruskal-Wallis test will be applied, both with 5% significance level. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
RIZZANTE, FABIO A. P.; SOARES-RUSU, IDIANE B. L.; SENNA, SUELLEN S.; RAMOS-TONELLO, CARLA M.; MONDELLI, RAFAEL F. L.; ISHIKIRIAMA, SERGIO K.; BORGES, ANA FLAVIA S.; GUTMACHER, ZVI. Flexural strength of minimum thickness ceramic veneers manufactured with different techniques. Quintessence International, v. 51, n. 4, p. 268-273, APR 2020. Web of Science Citations: 0.

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