| Texto completo | |
| Autor(es): |
Ramos, Carla Mueller
[1]
;
Cesar, Paulo Francisco
[2]
;
Lia Mondelli, Rafael Francisco
[1]
;
Tabata, Americo Sheitiro
[3]
;
Santos, Juliete de Souza
[4]
;
Sanches Borges, Ana Flavia
[1]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Bauru Sch Dent, Fac Sci, Dept Dent Endodont & Dent Mat, BR-17012901 Bauru, SP - Brazil
[2] Univ Sao Paulo, Bauru Sch Dent, Fac Sci, Dept Biomat & Oral Biol, BR-17012901 Bauru, SP - Brazil
[3] Univ Sao Paulo, Bauru Sch Dent, Fac Sci, Dept Phys, BR-17012901 Bauru, SP - Brazil
[4] Univ Sao Paulo, Bauru Sch Dent, Fac Sci, BR-17012901 Bauru, SP - Brazil
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF PROSTHETIC DENTISTRY; v. 112, n. 4, p. 886-894, OCT 2014. |
| Citações Web of Science: | 11 |
| Resumo | |
Statement of problem. Zirconia has the best mechanical properties of the available ceramic systems. However, the stability of the zirconia-feldspathic porcelain interface may be jeopardized by the presence of the chipping and debonding of the feldspathic porcelain. Purpose. The purpose of this study is to evaluate the shear bond strength of 3 cold isostatic pressed zirconia materials and a feldspathic veneer by analyzing their interface with micro-Raman spectroscopy. Material and methods. The test groups were experimental zirconia, Zirkonzahn zirconia, and Schuetz zirconia. Blocks of partially sintered zirconia were cut into disks (n=20) and then veneered with a feldspathic porcelain. Half of the specimens from each group (n=10) were incubated in 37 degrees C water for 24 hours, and the other half were thermocycled. All the specimens were then subjected to shear testing. The fractured areas were analyzed with optical stereomicroscopy and classified as adhesive, cohesive, or an adhesive-cohesive failure. Spectral patterns were examined to detect bands related to the zirconia and feldspathic porcelain phases. The shear strength data were submitted to 2-way ANOVA. Results. No significant differences in shear bond strength were observed among the 3 groups, regardless of whether or not the specimens were thermocycled. Adhesive failures were the most prevalent types of failure (70%). Raman spectra were clearly distinguished for all the materials, which showed the presence of tetragonal and monoclinic phases. Conclusions. The controlled production of the experimental zirconia did not influence the results of the bond strength. Raman analysis suggested a process of interdiffusion by the presence of peaks associated with the zirconia and feldspathic ceramics. (AU) | |
| Processo FAPESP: | 11/18061-0 - Análise mecânica, estrutural e de copings de zircônia experimental para uso em sistema CAD/CAM |
| Beneficiário: | Ana Flávia Sanches Borges |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |