Evaluation of bond strength of self-adhesive resin composite repairs

To evaluate the bond strength of repairs with the self-adhering flowable composite Vertise Flow (Kerr) and a conventional composite resin Filtek Z350 (3M ESPE) subjected to different surface treatments.

Methods:

Forty specimens were divided into four groups: ZV (Filtek Z350 + Vertise Flow, without prior treatment); ZAV (Z350 + Vertise Flow with prior treatment with Single Bond Universal Adhesive System (3M ESPE)); ZAZ (Filtek Z350 + Filtek Z350 with prior treatment with Single Bond Universal Adhesive System (3M ESPE)); VV (Vertise Flow + Vertise Flow, without prior treatment). After 15 days of storage, the specimens were subjected to microtensile tests (Kratos IKCL3-USB, SP, Brazil), with speed of 0.5 mm/min and 20kg load. For statistical analysis, ANOVA with Tukey tests were used (p < 5%).

Results:

The mean values of the bond strength were highest respectively in the groups: ZV (36.07 ± 37.63); ZAZ (24.04 ± 28.51); VV (19.39 ± 28.24) and ZAV (16.06 ± 15.66). The bond strength of the repairs between the groups presented satisfactory results.

Conclusion:

The self-adhesive composite resin Vertise Flow seems to be a viable and fast alternative for composite resins repairs.

Indexing terms
Composite resins; Dental materials; Mechanical tests

Material	Composition	Recommended technique	Manufacturer (batch number)
Vertise Flow^™	Organic matrix: GPDMA, HEMA, Bis-GMA and catalysts. Filler particles: silanized glass prepolimers of Ba, SiO2 and YF3 (70% weight and 57% volume).	1- Insertion of thin layer (0.5mm) 2- Shake with a microbrush (15-20s) 3- Ligh-curing 20s 4- 2mm incremental insertion 5- Light-curing of each increment for 20s.	Kerr, Orange, CA, USA (4917943)
Filtek Z350^™	Organic matrix: Bis-GMA, UDMA and Bis-EMA. Organic matrix: zirconia and silica (82% weight e 60% volume).	1- 2mm incremental insertion 2- 20 seconds light curing	3M ESPE St. Paul, MN, USA (N427790)
Single Bond Universal^™	Bis-GMA, HEMA, dimetacrilate, ethanol, water, initiator, polyacrylic and polyalkanoic acid methacrylate functional copolymer and silanized silica nanoparticles.	1- Etching for 30s 2- Adhesive application for 20s 3- Drying for 5s 4- Light-curing for 10s	3M ESPE St. Paul, MN, USA (507329)
Condac 37% FGM	37% Phosphoric acid, thickener, stain and ionized water.	1- Etching for 30s 2- Washing for 60s. 3- Dry with air spray for 20s.	FGM Joinville, Santa Catarina, Brazil (282085)

Group	Material used for restoration	Material used for repair	Acid etching + Universal Adhesive
ZV	Z350 composite resin	Vertise Flow	No
ZAV	Z350 composite resin	Vertise Flow	Yes
ZAZ	Z350 composite resin	Z350 composite resin	Yes
VV	Vertise Flow	Vertise Flow	No

Group	Mean	Standard-Deviation	Coeficiente of variation	Median	P25	P75
ZV	36,07^(A)	9,52	26,39	37,63	29,36	44,07
ZAV	16,06^(B)	7,19	44,77	15,66	10,05	20,05
ZAZ	28,51^(C)	9,25	32,44	28,24	19,52	34,66
V V	24,04^(C)	9,64	40,10	19,39	15,26	34,43
p-value					< 0,001^* * Statistical significance difference (a = 5.0%) ⁽¹⁾ (1) Through the Kruskal-Wallis test for comparison between the groups. Different letters show statistical significant difference.

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[1] Correspondence to: MA DURAO. E-mail: marciadurao.fop@gmail.com.