Fourier transform infrared photoacoustic spectroscopy study of physicochemical interaction between human dentin and etch-&-rinse adhesives in a simulated moist bond technique.
The purpose of this study was to provide the physicochemical interactions at the interfaces between two commercial etch-&-rinse adhesives and human dentin in a simulated moist bond technique. Six dentin specimens were divided into two groups (n=3) according to the use of two different adhesive systems: (a) 2-hydroxyethylmethacrylate (HEMA) and 4-methacryloxyethyl trimellitate anhydrate (4-META), and (b) HEMA. The Fourier transform infrared photoacoustic spectroscopy was performed before and after dentin treatment with 37% phosphoric acid, with adhesive systems and also for the adhesive systems alone. Acid-conditioning resulted in a decalcification pattern. Adhesive treated spectra subtraction suggested the occurrence of chemical bonding to dentin expressed through modifications of the OH stretching peak (3340 cm(-1)) and symmetric CH stretching (2900 cm(-1)) for both adhesives spectra; a decrease of orthophosphate absorption band (1040 to 970 cm(-1)) for adhesive A and a better resolved complex band formation (1270 to 970 cm(-1)) for adhesive B were observed. These results suggested the occurrence of chemical bonding between sound human dentin and etch-&-rinse adhesives through a clinical typical condition.
State University of Maringá, Department of Dentistry, Av. Mandacaru 1550, 87080-000, Maringá, PR, Brazil. adrianaubaldini@gmail.com
Adriana L M
AL
Ubaldini
Mauro L
ML
Baesso
Elizandra
E
Sehn
Francielle
F
Sato
Ana R
AR
Benetti
Renata C
RC
Pascotto
D000134:Acid Etching, Dental / Q000379:methods; D000269:Adhesives / Q000737:chemistry*; D002627:Chemistry, Physical / Q000379:methods; D001840:Dental Bonding / Q000379:methods*; D003804:Dentin / Q000378:metabolism*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D006801:Humans; D008689:Methacrylates / Q000737:chemistry; D008956:Models, Chemical; D008963:Molar; D016011:Normal Distribution; D061088:Photoacoustic Techniques / Q000379:methods*; D019279:Resin Cements / Q000737:chemistry*; D013053:Spectrophotometry / Q000379:methods*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*
D000269:Adhesives; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D019279:Resin Cements; C005044:hydroxyethyl methacrylate; C034139:4-methacryloxyethyltrimellitic acid anhydride