Browsing by Author "AlZain, Afnan"

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    EVALUATION OF MICROTENSILE BOND STRENGTH AND MICROLEAKAGE OF A ONE-STEP SELF-ETCH ADHESIVE
    (Office of the Vice Chancellor for Research, 2012-04-13) AlZain, Afnan; Eckert, George; Platt, Jeffrey
    New dental glue (G-aenial Bond-GB) was developed to increase the strength of bonding the white tooth filling to the tooth. An extra roughening step of the tooth surface using a specific acid should help the flow of the glue to the tooth and increases the strength of the bond between the tooth and the filling. Therefore, this study was done to evaluate how strong the bond is between the filling and the tooth using GB, and how much GB leaks and compare both tests with two other glue products and, with and without adding an extra roughening step. For the bond strength test, human molars teeth were divided into 5 groups, each containing 15 teeth. In 3 groups, each glue type was applied on tooth dentin according to company's instructions. In the last 2 groups an extra roughening step using a specific acid was added before applying the glue. The samples were stored in fake saliva where four samples were soaked for 48h and four samples were placed in a machine (thermocycling) that resembles drinking hot and cold beverages where samples are exposed to hot and cold water for 40 days and then the strength of the bond was tested (α=0.05). The broken edges were examined using a light microscope. For the leak test, human molars were divided randomly into the same 5 groups as bond strength test but each containing 11 teeth. A cavity was pre-pared and filled on the check and tongue sides of the tooth. Teeth were then also subjected to thermocylcling and stored for four weeks, soaked in dye for 24 hours and sectioned. The dye penetration was evaluated using light mi-croscopy (α=0.05). Bond strength of GB was significantly higher when an acid roughening step was added. No significant difference in leak of GB was observed.
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    Microtensile Bond Strength and Microleakage of HEMA-Free One-Step Self-Etch Adhesive
    (Office of the Vice Chancellor for Research, 2013-04-05) AlZain, Afnan; Eckert, George; Platt, Jeffrey A.
    This study evaluated the microtensile dentin bond strength (μ-TBS) and microleakage of a one-step HEMA-free self-etch adhesive (G-aenial Bond-GB) compared to a 2-step self-etch (Clearfil SE-SE) and a 3-step etch and rinse (OptiBond FL-OB) adhesive with and without pre-etching with phosphoric acid. Human molars were divided randomly into 5 groups (n=15), GB and SE (without pre-etching), GB+ and SE+ (with pre-etching), and OB. Eight beams were obtained from each tooth and half of the beams were subjected to μ-TBS testing after 2d. The remaining beams were thermocycled (2,500 cycles), aged for 40d and subjected to μ-TBS testing using a universal testing machine. Failures were analyzed using light microscopy and SEM. Similar groups were used for the microleakage test (n=11). Class V cavities were prepared on the buccal and lingual surfaces of each molar. Teeth were thermocycled (2,500 cycles), aged for 40d, soaked in 1% methylene blue dye for 24h, and sectioned longitudinally from the facial to lingual surface. The dye penetration was scored using light microscopy and an ordinal scale from 0-3. Data was analyzed using Weibull, GEE, and Wilcoxon Rank Sum tests (α=0.05). Phosphoric acid pre-etching significantly increased dentin bond strength. After 40d, the mean bond strength ranged from 28.6-45.7 MPa with a statistical significance of GB, SE