0197 Flexural strength of self-adhesive resin cements
R. FULGENCIO1, A. PINTO2, R.M. CARVALHO3, R. OSORIO4, F.S. AGUILERA4, and M. TOLEDANO4, 1Universidade Gama Filho, Rio de Janeiro, Brazil, 2Instituto superior de ciencias da saude, Monte Caparica, Portugal, 3Bisco, Inc, Schaumburg, IL, USA, 4University of Granada, Spain

Self-adhesive cements contain acidic monomers that may compromise curing and consequently the mechanical properties when compared to traditional non-adhesive cements.

Objectives: This study evaluated the three-point bending flexural strength of self-adhesive resin cements (Rely X Unicem – 3M ESPE, G-Cem – GC, Bis-Cem –Bisco) compared to conventional non-adhesive resin cements (Calibra – Dentsply, Multilink Sprint –Ivoclar Vivadent, Panavia F2.0 – Kuraray).

Methods:

Five rectangular specimens (25×2×2 mm) were prepared from each cement. Light-curing was carried out immediately after mixing and dispensing using a conventional QTH light-curing unit (Optilux 401) with a power density of 500 mW/cm2 and placed in  distilled water at 37 °C for 48 hours. The flexural strength was determined in a Instron universal machine (Model 4411, Instron Corp., Canton, MA) at 0.75 mm/min. Data were submitted to one-way ANOVA and Student Newman Keuls (P< 0.05).

Results:  Mean flexural strength and standard deviation are presented in the table. Same letters indicate no differences between groups

Material

GCem

RelyX Unicem

Multlink Sprint

BisCem

Panavia F 2.0

Calibra

Flexural Strength- Mpa (SD)

47.7 (16.0)c

76.7 (13.0)b

104.9 (8.8)a

88.7 (8.5)a,b

106.6 (21.2)a

91.2 (14.4)a,b

In general, conventional cements presented higher flexural strength than self-adhesive ones. Among the self-adhesive, the weakest material was G-Cem followed by Unicem and BisCem that were not different from one another.

Conclusions: Self-adhesive resin cements presented lower flexural strength than conventional, non- adhesive resin cements. (Grants number - CAPES# O565-07-5 – CITYT/FEDER:MAT04-06872-C03-02).

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