Eroded dentin does not jeopardize the bond strength of adhesive restorative materials.
This in vitro study evaluated the bond strength of adhesive restorative materials to sound and eroded dentin. Thirty-six bovine incisors were embedded in acrylic resin and ground to obtain flat buccal dentin surfaces. Specimens were randomly allocated in 2 groups: sound dentin (immersion in artificial saliva) and eroded dentin (pH cycling model - 3× / cola drink for 7 days). Specimens were then reassigned according to restorative material: glass ionomer cement (KetacTM Molar Easy Mix), resin-modified glass ionomer cement (VitremerTM) or adhesive system with resin composite (Adper Single Bond 2 + Filtek Z250). Polyethylene tubes with an internal diameter of 0.76 mm were placed over the dentin and filled with the material. The microshear bond test was performed after 24 h of water storage at 37ºC. The failure mode was evaluated using a stereomicroscope (400×). Bond strength data were analyzed with two-way ANOVA and Tukey's post hoc tests (α = 0.05). Eroded dentin showed bond strength values similar to those for sound dentin for all materials. The adhesive system showed the highest bond strength values, regardless of the substrate (p < 0.0001). For all groups, the adhesive/mixed failure prevailed. In conclusion, adhesive materials may be used in eroded dentin without jeopardizing the bonding quality. It is preferable to use an etch-and-rinse adhesive system because it shows the highest bond strength values compared with the glass ionomer cements tested.
Department of Pediatric Dentistry, School of Dentistry, São Leopolodo Mandic Dental Research Center, Campinas, SP, Brazil.
Janaina Barros
JB
Cruz
Tathiane Larissa
TL
Lenzi
Tamara Kerber
TK
Tedesco
Camila de Almeida Brandão
Cde A
Guglielmi
Daniela Prócida
DP
Raggio
D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding / Q000379:methods*; D003764:Dental Materials / Q000737:chemistry*; D003804:Dentin / Q000737:chemistry*; D005899:Glass Ionomer Cements / Q000737:chemistry; D008422:Materials Testing; D011897:Random Allocation; D012464:Saliva, Artificial / Q000737:chemistry; D033081:Shear Strength; D013499:Surface Properties; D013997:Time Factors; D014077:Tooth Erosion
D003188:Composite Resins; D003764:Dental Materials; D005899:Glass Ionomer Cements; D012464:Saliva, Artificial