The effects of air-abrasion on dentin, enamel, and metal bonding.
OBJECTIVE
To determine the most effective emission pressure for producing effective bond strengths of an adhesive resin to enamel, dentin and metal.


METHODS
Test specimens were prepared from bovine teeth for enamel and dentin samples and from alloy disks cast in an Ag-Pd-Cu-Au alloy. All specimen substrates were ground flat and finished with 600-grit SiC paper. The prepared specimens were randomly divided into groups of eight including a control (no abrasion) or air-abraded with 50 microm Al2O3 delivered at three emission pressures of 60, 45 and 30 psi, respectively. Following conditioning, 4-META/MMA-TBB resin was bonded to the specimen surfaces. Specimens were stored in 37 degrees C water for 24 hours, then thermocycled 20,000 times (4 degrees C-60 degrees C), and shear bond tested. Data were analyzed by ANOVA for statistical significance.


RESULTS
Enamel specimens showed no statistically significant difference from the control (no air abrasion). Dentin specimens displayed a significant difference from control at 60 and 45 psi, but no significant difference from the control at 30 psi. Alloy specimens showed significantly higher bond strengths from the control at all emission pressures (P< 0.05).
Department of Fixed Prosthodontics, Kagoshima University Dental School, 8-35-1 Sakuragaoka, Kagoshima-shi, Kagoshima 890-8544, Japan. kajihiro@dentb.hal.kagoshima-u.ac.jp
Hirotada
H
Kajihara
Shiro
S
Suzuki
Yoshito
Y
Minesaki
Hisanori
H
Kurashige
Takuo
T
Tanaka
D020906:Air Abrasion, Dental; D000704:Analysis of Variance; D000818:Animals; D001896:Boron Compounds / Q000737:chemistry; D017554:Carbon Compounds, Inorganic / Q000737:chemistry; D002417:Cattle; D003300:Copper / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry*; D001840:Dental Bonding; D003743:Dental Enamel / Q000648:ultrastructure*; D003804:Dentin / Q000648:ultrastructure*; D006047:Gold Alloys / Q000737:chemistry; D008422:Materials Testing; D008768:Methylmethacrylates / Q000737:chemistry; D010165:Palladium / Q000737:chemistry; D011312:Pressure; D011897:Random Allocation; D012117:Resins, Synthetic / Q000737:chemistry; D017655:Silicon Compounds / Q000737:chemistry; D012834:Silver / Q000737:chemistry; D013314:Stress, Mechanical; D013696:Temperature; D014867:Water / Q000737:chemistry
C476988:4-methacryloxyethyltrimellitic acid-methylmethacrylate-tributylborane; D001896:Boron Compounds; D017554:Carbon Compounds, Inorganic; D003722:Dental Alloys; D006047:Gold Alloys; D008768:Methylmethacrylates; D012117:Resins, Synthetic; D017655:Silicon Compounds; D014867:Water; D012834:Silver; D010165:Palladium; D003300:Copper; C022088:silicon carbide