Abstract
The purpose of this study was investigate the influence of different surface treatments on the shear bond strength of two different type of artificial resin teeth repaired with composite resin. Fifteen (15) artificial teeth of each material (CR-composite resin and AR-acrylic resin) were divided into four parts and then embedded in acrylic resin. After, the teeth were separated into eight groups according to the surface treatments prior to the repair: control group (c), adhesive application (a), sandblasting (S) and sandblasting followed by adhesive application (Sa). Next, a composite resin cylinder (Ø = 0.95 mm e h = 2 mm) simulating a repair was built onto each surface. The specimens were submitted to a microshear bond test after 24 h, using a universal testing machine (1 mm/min, 50 kgf) until fracture. The data was subjected to two-way analysis of variance (ANOVA) and Tukey test, with a significance level of 5%. ANOVA showed statistical difference for the interaction artificial teeth material* surface treatment (p = 0.001). CR teeth (29.79 ± 11.54 MPa) showed higher bond strength mean values than AR (18.48 ± 9.73 MPa). Regardless the artificial teeth material, Sa (36.92 ± 6.16 MPa) treatment showed the higher bond strength values. The highest bond strength value was found in CRSa (45.93 ± 7.13 MPa) and the lowest was found in ARc (5.38 ± 0.90 MPa). Based on the results, tooth material should be taken in account in order to choose the best surface treatment and achieve suitable bond strength values when a repair is necessary. For artificial teeth in acrylic resin, applying an adhesive system is the best procedure, with or without sandblasting the alumina particles. However, for artificial teeth in composite resin, an association of sandblasting followed by applying an adhesive system showed more promising bond strength values.
Highlights
Full arch prosthesis is one alternative to rehabilitate edentulous patients
Each tooth was sectioned into 4 parts that were embedded in chemically activated acrylic resin (Jet—Classic, São Paulo, Brazil) prior to receive different surface treatments
Regarding the “surface treatment” factor independent of the artificial teeth material, the bond strength values increased in the ratio: no treatment (12.40 ± 3.38)d < sandblasting (21.31 ± 4.82)c < adhesive system application (26.08 ± 5.74)b < sandblasting followed by adhesive system application (36.92 ± 6.16)a
Summary
Full arch prosthesis is one alternative to rehabilitate edentulous patients. This prosthesis consists of artificial teeth mounted on a mucus supported acrylic resin base with the purpose to restore aesthetics, phonetics and mastication [1]. The stresses induced in the denture may cause injury to the support tissue, if equilibrium conditions suitable for occlusal adjustment are not created [2]. Acrylic resin artificial teeth exhibit often-occlusal wear, which leads to decreased masticatory efficiency and loss of vertical dimension [5].They present clinical problems, as they suffer remolding of worn occlusal surfaces in denture teeth [5, 6], and fractures or debonding from the prosthesis base [7]
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