Effect of different sandblasting protocols and manufacturing techniques in fracture resistance of fixed partial dentures and crowns of ytria estabilized zirconia: chemical-structural analysis

• Grant number: 10/19126-6
• Support Opportunities: Regular Research Grants
• Start date: March 01, 2011
• End date: February 28, 2013
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Marco Antonio Bottino
• Grantee: Marco Antonio Bottino
• Host Institution: Instituto de Ciência e Tecnologia (ICT). Universidade Estadual Paulista (UNESP). Campus de São José dos Campos. São José dos Campos , SP, Brazil
• Associated researchers: Renata Marques de Melo Marinho ; Rodrigo Othávio de Assunção e Souza

Abstract

This study will investigate the effect of different sandblasting protocols and manufacturing techniques in fracture resistance of fixed partial dentures (PPFs) and crowns of ytria estabilized zirconia. In the first part of the study, selected 80 healthy human teeth, 40 premolars and 40 molars, will be included in polyurethane at a distance of 11 mm. 40 PPFs will be made with the infrastructure of ytria estabilized zirconia (InCeram 2000 YZ Cubes, Vita-Zahnfabrik, Germany), which will be divided into four groups according to the sandblasting protocol and application of veneering ceramic: Gr1 - PPFs prepared in a conventional way; Gr2 - PPFs with infrastructure in the gingival region of connectors and pontic without application of veneering ceramic; Gr3 - Group 2 + sandblasting the gingival area of connectors and pontic with aluminum oxide (50 micron); Gr4 - Group 2 + sandblasting the gingival area of connectors and pontic with silica oxide (30 microns). The PPFs will be cemented in dental preparations with Panavia F2.0 (Kuraray Medical, Japan) and subjected to mechanical fatigue (1,200,000 cycles; load: 85 N, Frequency 4Hz). In the second part of the work will be made 60 crowns which will be divided into six groups, varying the cervical collar of the substructure (SE) and the cement used: Gr1 - Cervical Collar total Variolink + II (VII) (Ivoclar Vivadent, Liechtenstein ) Gr2 - Cervical Collar total + Clearfil SA Cement (CSA) (Kuraray Medical, Japan); Gr3 - Cervical Collar 180 ° + VII Gr 4 - Cervical Collar 180 ° + CSA; Gr5 - No neck collar + VII; GR6 -No cervical collar + CSA. The crowns are cemented in preparations made in resin G-10 (material similar to dentin) with dimensions similar to full crown preparation in upper teeth and then be subjected to mechanical cycling (1,200,000 cycles; load: 85 N, Frequency : 4Hz) and thermocycling (6000 cycles, 5 to 55). The specimens will be tested using the resistance to fracture in Universal Testing Machine (EMIC, Sao Jose dos Pinhais, Brazil) with load cell of 1000 Kgf and constant speed of 1mm/min. The data will be analyzed by analysis of variance (ANOVA) and differences by Tukey test with significance of 95%. (AU)

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)

CAMPOS, FEMANDA; SOUZA, RODRIGO O. A.; BOTTINO, MARCO A.; OZCAN, MUTIU. Fracture Strength, Failure Types, and Weibull Characteristics of Three-Unit Zirconia Fixed Dental Prostheses After Cyclic Loading: Effects of Veneering and Air-Abrasion Protocols. INTERNATIONAL JOURNAL OF PERIODONTICS & RESTORATIVE DENTISTRY, v. 36, n. 6, p. 901-908, NOV-DEC 2016. (10/19126-6, 10/14355-7)

CAMPOS, FERNANDA; CARDOSO, MAYRA; DE MELO, RENATA MARQUES; BOTTINO, MARCO ANTONIO; SOUZA, RODRIGO O. A.. Effect of Cervical Collar Removal on the Fracture Load of Anterior Zirconia Crowns. INTERNATIONAL JOURNAL OF PERIODONTICS & RESTORATIVE DENTISTRY, v. 37, n. 2, p. 241+, MAR-APR 2017. (10/19126-6)