One-year aging effects on microtensile bond strengths of composite and repairs with different surface treatments

Abstract

The present study aimed to evaluate effects of different surface treatments and aging of composite cylinders on bond strength of composite resin repair. Thirty-two composite cylinders were produced and divided into four groups according to type of surface treatment and storage time of composite cylinder and repair. Cylinder surface of control group (G control ) received no treatment before composite repair. Other groups were sandblasted with aluminum oxide (G Al2O3 ), followed by silane (G Al2O3sil ) or adhesive (G Al2O3ad ). Composite cylinders were stored in artificial saliva for either 24 hours or 1 year. Repairs were performed and stored in artificial saliva for 24 hours or 1 year and repair strength was evaluated using microtensile bond strength test. Data were submitted to Student's t test, two-way ANOVA, and post hoc test for storage time and treatment (α = 0.05). G control group showed lower values of aging of composite cylinder and storage time of repair (24 hours or 1 year for both) compared with other groups (p < 0.05). G Al2O3ad and G Al2O3sil groups did not exhibit decreased microtensile bond strength with aged repairs (1 year; p > 0.05). Polymer degradation was significant for composite cylinders during the first year of storage in G control , G Al2O3 , and G Al2O3ad groups (p < 0.05). In G Al2O3sil group, storage time of composite cylinders was not significant (p > 0.05). Aging of composite resin influenced bond strength of restoration repair for up to 1 year. Sandblasting with Al 2 O 3 , followed by application of silane layer, produced high bond strength after composite or repair aging.

Repair versus Replacement: A Questionnaire Examining the Repair Preferences of Turkish Dentists in Dental Restorations

“…While some studies were consistent with this result [18], some studies found that the application was satisfactory [21]. As for air abrasion, numerous studies have shown that significantly improves bond strength in the repair of RBC restorations [35][36][37]. However, only 5% of Turkish dentists responded that they use air abrasion in the treatment of repair.…”

Effects of surface treatments on the bond strength of glass hybrid restorative system repaired with hybrid composite resin

“…In this study, Al 2 O 3 increased the bonding strength significantly in the repair process of the RBCs. Most of the previous studies have also found that Al2O3 increases the bond strength significantly (16,(24)(25)(26)(27)(28)(29)(30)(31)(32), but a few studies found that opposite results (33,34). Al2O3 has the ability to form micro retention areas and these areas increase wettability and adhesion to the restoration (35).…”

“…In our study, the thermal cycle process was applied after the bonding with the aim of imitating the oral environment. However, in many studies, it has been shown that the thermocycling procedure reduces the bonding strength by a significant amount (16). Stallings,et al (22) noted that when the coating is not applied, the bonding strength of the Equia system will be reduced.…”

“…These methods are applied with the aim of increasing the surface energy of the restoration to be repaired and irregularizing the surface structure that increases surface area, removing the layer on the restoration surface which underwent structural change due to saliva effect (12). Traditionally as well as acid application to the tooth surface, new techniques such as laser application (13,14), aluminium oxide abrasion (Al2O3) (15)(16)(17) have become popular.…”

Efeito da adição de fosfato dicálcico dihidratado (DCPD) sobre as propriedades mecânicas e liberação de íons após imersão prolongada de compósitos experimentais

“…Isto ocorre devido à ausência de interação química entre a matriz resinosa e as partículas de CaP, o que resulta em uma concentração de tensões na interface matriz/partícula favorecendo a propagação de trincas que levam à fratura do material[15,16]. Assim, a associação entre partículas de reforço e partículas de CaP se faz necessária[9,15,17].Independentemente da presença de partículas de CaP, compósitos resinosos sofrem degradação no ambiente oral, o que se reflete na redução das suas propriedades mecânicas[18][19][20]. A degradação está intimamente ligada à presença de grupos éster nos monômeros constituintes da matriz resinosa, altamente suscetíveis a mecanismos de oxidação e hidrólise quando expostos a fluidos e enzimas salivares[21].…”