Y-TZP zirconia regeneration firing: Microstructural and crystallographic changes after grinding

Autor(es)

Obelenis Ryan, Daniel Patrick ^[1] ; Grassi Fais, Laiza Maria ^[1] ; Antonio, Selma Gutierrez ^[2] ; Hatanaka, Gabriel Rodrigues ^[1] ; Candido, Lucas Miguel ^[1] ; Pereira Pinelli, Ligia Antunes ^[1]

Afiliação do(s) autor(es)

^[1] UNESP Univ Estadual Paulista, Araraquara Dent Sch, Dept Dent Mat & Prosthodont, Humaita St, 1680, BR-14801903 Sao Paulo, Araraquara - Brazil

^[2] UNESP Univ Estadual Paulista, Araraquara Inst Chem, Dept Phys Chem, Prof Francisco Degni St, 55, BR-14800060 Sao Paulo, Araraquara - Brazil

• Tipo de documento: Artigo Científico
• Fonte: DENTAL MATERIALS JOURNAL; v. 36, n. 4, p. 447-453, AUG 2017.
• Citações Web of Science: 7

Resumo

This study evaluated microstructural and crystallographic phase changes after grinding (G) and regeneration firing/anneling (R) of Y-TZP ceramics. Thirty five bars (LavaTM and Ice Zirkon) were divided: Y-TZP pre -sintered, control (C), regeneration firing (R), dry grinding (DG), dry grinding+regeneration firing (DGR), wet grinding (WG) and wet grinding+regeneration firing (WGR). Grinding was conducted using a diamond bur and annealing at 1,000 C. The microstructure was analyzed by SEM and the crystalline phases by X-ray diffraction (XRD). XRD showed that pre -sintered specimens contained tetragonal and monoclinic phases, while groups C and R showed tetragonal, cubic and monoclinic phases. After grinding, the cubic phase was eliminated in all groups. Annealing (DGR and WGR) resulted in only tetragonal phase. SEM showed semi -circular cracks after grinding and homogenization of particles after annealing. After grinding, surfaces show tetragonal and monoclinic phases and R can be assumed to be necessary prior to porcelain layering when grinding is performed. (AU)

• Processo FAPESP: 13/21438-4 - Caracterização microestrutural da zircônia parcialmente estabilizada por ítria após desgaste e ressinterização
• Beneficiário: Daniel Patrick Obelenis Ryan
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 11/11509-6 - Resistência à flexão da zircônia Y-TZP após diferentes tipos de desgastes e ressinterização
• Beneficiário: Ligia Antunes Pereira Pinelli
• Modalidade de apoio: Auxílio à Pesquisa - Regular