Enamel tensile bond strength and morphology of resin–enamel interface created by acid etching system with or without moisture and self‐etching priming system

Abstract

The purpose of this study was to estimate the effect of three types of different adhesive systems on enamel adhesion. Scotchbond Multi-Purpose (MP) as a traditional system, Single Bond (SB) as a wet-bonding system and Clearfil SE Bond (SE) and Unifil Bond (UB) as self-etching priming systems were used. Bovine enamel was treated with each system and tensile bond strength (TBS) of resin to the enamel was measured. The conditioned enamel surfaces and resin-enamel interfaces were also morphologically observed with scanning electron microscope (SEM). The mean TBS for MP, SB, SE and UB were 15.3, 13.7, 14.3 and 11.6 MPa, respectively. There was no significant difference in mean TBS among all products but the traditional system showed the most stable TBS. In SEM observations, self-etching primer created a weaker etched pattern on the enamel surface than phosphoric acid. At the resin-enamel interfaces, thick tag-like extensions penetrated into the enamel etched with phosphoric acid regardless of using the wet-bonding technique, while self-etching primer created thin lamina-like resin penetrations. These results indicate that the traditional system with phosphoric acid etching exhibits the most stable enamel adhesion although the enamel-bonding promoting abilities of these adhesive systems are equivalent to each other.

Atomic force microscopy observation of enamel surfaces treated with selfetching primer

“…This result can be explained by the fact that prisms do not end directly on the outer enamel surface. Acidic functional monomers could decalcify interprismatic enamel only but simultaneously improve resin monomer penetration into the porous enamel substrate 12,31) . However, the lower pH value of TX may be responsible for the difference in the erosion effects.…”

Effect of Phosphoric Acid Etching of Enamel Margins on the Microleakage of a Simplified All-in-One and a Self-etch Adhesive System

“…5 Some studies showed that selfetching adhesives are not sufficiently strong to decalcify the core of enamel prisms, thus creating a thin layer between the resin composite and thin lamina-like resin extensions, which may adversely affect the durability of enamel adhesion. [13][14] The insufficient etching of selfetching adhesives can be attributed to the diminishing abilities of decalcification due to total inactivation of the acid in contact with the enamel surface. 5 Abo and others 15 suggested that the etching effect is an important factor in the bonding of self-etching adhesives (AD Bond) to enamel.…”

Comparación De La Fuerza Adhesiva Y El Tipo De Falla De Dos Sistemas Adhesivos Para Ortodoncia

“…7,10,17,20 Posiblemente, esto puede estar relacionado con la utilización de dientes bovinos y no de dientes humanos. Previamente, Oesterle y colaboradores analizaron el uso de dientes bovinos en estudios de adhesión, concluyeron que las fuerzas observadas eran menores en comparación a las logradas en dientes humanos.…”