Immediate bond performance of resin composite luting systems to saliva‐contaminated enamel and dentin in different curing modes

Abstract

The purpose of this study was to evaluate the immediate shear bond strength of resin composite luting systems to tooth with or without saliva contamination in different curing modes. The Knoop hardness number of the resin composite luting agents was measured. Four combinations of resin composite luting systems were used. The shear bond strength to bovine teeth was measured with and without saliva contamination in different curing modes at different storage periods. The Knoop hardness number of the resin composite luting agents was also evaluated. Significantly lower enamel and dentin shear bond strengths and Knoop hardness number values were observed in all resin composite luting systems at 5 min versus 24 h, regardless of the curing mode or saliva contamination. The influence of the curing mode of the resin composite luting systems on shear bond strengths and Knoop hardness number was dependent on material. For the saliva contamination conditions, only G-CEM ONE EM did not show any significant difference in shear bond strength among the groups with and without saliva contamination, regardless of curing mode, storage period, or tooth substrate. All the resin composite luting systems showed lower shear bond strengths and Knoop hardness number values immediately after setting.

Biodegradation of Dental Resin-Based Composite—A Potential Factor Affecting the Bonding Effect: A Narrative Review

“…On the 12th day alone, the hardness of the thermally polymerized acrylic resin in saliva decreased, and the roughness began to increase on the 24th day [ 33 ]. At the same time, the shear strength and microtensile strength of the resin soaked in saliva dropped sharply in a very short time [ 34 , 35 ]. Furthermore, biodegradation also softens the surface layer of the resin, leading to mechanical wear during chewing.…”

“…Resin is polymerized by a variety of monomers, so once the monomers are released excessively, it will age and its mechanical properties will weaken to the extent that the resin composite cannot withstand the normal occlusal force. The final result is that it falls off and is damaged [ 34 , 35 ].…”

Scanning electron microscopy observation of dentin bond interfaces in different types of resin luting cements

“…Single-step universal adhesives often serve as primers due to their versatility and thin adhesive layer 6,7) . Universal adhesives can be used in either etch-&-rinse (ER) mode or self-etch (SE) mode with the tooth substrate, and they can be used with various adherent surfaces without any pretreatment [8][9][10] . These RLC systems offer many pretreatment options, including both ER and SE modes and the presence or absence of the primer as appropriate to the type of indirect restoration 11,12) .…”

Influence of luting strategies on dentin bond performance of self-adhesive resin luting cement combined with a universal adhesive

“…Universal adhesives are often employed as tooth primers for both self-adhesive RLCs and adhesive/multistep RLCs. They can adhere to various indirect restoration surfaces without pretreatment and can be applied in either etch-&rinse (ER) mode or self-etch (SE) mode on tooth substrates [11][12][13]. Some universal adhesives incorporate "touch-cure polymerization" technology, involving chemical polymerization of resin cement accelerators or a dual-cure accelerators, to enhance the polymerization reaction of RLC paste when in contact with the luting cement paste [8, 9,14].…”