Effect of Water Storage on the Shear Strength and Fatigue Limit of the Reline Resin Bond to Denture Base Resins

Autor(es)

Vergani, Carlos Eduardo ^[1] ; Seo, Rosangela Seiko ^[2] ; Santos Nunes Reis, Jose Mauricio ; Giampaolo, Eunice Teresinha ; Pavarina, Ana Claudia ; Machado, Ana Lucia

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ, UNESP, Dept Dent Mat & Prosthodont, Fac Odontol Araraquara, Araraqura Dent Sch, BR-14801903 Araraquara, SP - Brazil

^[2] Varzea Grande Dent Sch, Dept Prosthodont, Varzea Grande, MT - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Adhesive Dentistry; v. 12, n. 4, p. 319-327, AUG 2010.
• Citações Web of Science: 3

Resumo

Purpose: This study evaluated the effect of water storage (WS) on the shear bond strength (SBS) and shear bond fatigue limit (SBFL) between denture base and reline resins. In addition, a possible correlation between SBS and SBFL was evaluated. Materials and Methods: Two denture base (Lucitone 550-L and Acron MC-AC) and two reline resins (Ufi Gel Hard-UGH and Tokuso Rebase Fast-TR) were selected. Cylinders (20 x 20 mm) of each denture base resin were processed, and the reline resins were packed on the bonding surfaces using a split mold (3.5 x 5.0 mm). Specimens of each denture base-reline resin combination were subjected to shear forces (0.5 mm/min) until fracture. A staircase approach was used to determine the SBFL. Specimens were submitted to either 10,000 cycles (5.0 Hz) or until fracture. For both SBS and SBFL, specimens were tested after relining (control) and after 30 days of WS. Data (MPa) were analyzed with 2-way ANOVA and Tukey's tests (alpha = 0.05). To test for a possible correlation between the SBS and SBFL, a linear regression analysis was performed. Results: WS significantly increased (p < 0.05) the SBS of AC-TR and AC-UGH and the SBFL of AC-TR, AC-UGH and L-UGH. After WS, UGH produced higher (p < 0.05) SBS than TR, regardless of the denture base resin used. Regardless of the experimental groups and the denture base resins used, UGH produced higher (p < 0.05) SBFL than TR specimens. A strong positive linear correlation (r(2) = 0.949) was observed between the SBS and SBFL. Conclusion: Overall, UGH promoted the highest SBS and SBFL. WS increased the SBS and SBFL of the AC relined specimens. A positive correlation was observed between the two variables. (AU)

• Processo FAPESP: 03/03278-8 - Limite de fadiga na interface de união entre resinas para reembasamento e resinas para base de prótese: efeito do armazenamento em água
• Beneficiário: Aline Cristina da Silva
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 02/13728-8 - Efeito da imersao em agua sobre a resistencia de uniao entre resinas para reembasamento e resinas para base de protese.
• Beneficiário: Joice Goncalves
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica