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Credit Pacific Service Union Mahidol University Annual Research Abstracts 2000 1

Card Credit Mobile Service Supachai Sutimuntanakul, Kanokwan Sosakul Department of Operative, Faculty of Dentistry, Mahidol University.                       The objective of this study was to evaluate the apical leakage of continuous wave of condensation compared with lateral condensation and vertical condensation techniques. Seventy nine extracted maxillary molars were accessed and prepared coronal portion of palatal roots with Gate Glidden burs No.2 and 3. Canals were prepared with file to No.30, then stepped back to No. 55 and 5.25% sodium hypochlorite was used as an irrigant during preparation. Seventy five experimental teeth were divided equally into three groups which received gutta-percha obturation by lateral condensation, vertical condensation and continuous wave techniques respectively. The other four teeth were used as positive and negative control which left canals unfilled. All the palatal roots were sectioned at cervical level and 3 mm. of coronal canals were sealed with temporary filling, then stored in closed chamber with 100% humidity for 48 hours. The root surfaces of positive control group and experimental groups were coated with two layers of nail varnish excepted 1 mm. around apical foramina , so did the negative control group which was also sealed over apical foramina. After centrifugation 3000 rpm in india ink for 5 minutes , the roots were cleared and evaluated the dye leakage with 20 magnification stereomicroscope. Means of dye leakage were 0.6010 mm. in lateral condensation group , 0.6550 mm. in vertical condensation group and 0.7030 mm. in continuous wave group. There were no statistically significant difference in dye leakage between three obturation techniques ( P > 0.05 ).

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Card Credit Processing Service COMPARISON OF SHEAR BOND STRENGTH OF FIVE DENTAL FILLING MATERIALS : AN IN VITRO STUDY Amara Muangmingsuk, Peangpen Sukutamatunthi

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Credit Report Service                       The purpose of this study was to evaluate the shear bond strength of five filling materials. Occlusal surface of 75 extracted permanent premolars were ground to expose the dentin and restored with either Fuji ll, Fuji ll LC, Vitremer, Ketac-Silver and Dyract. All samples were kept in 37^oC distilled water for 7 days, thermocycled for 100 cycles and sheared with a universal testing machine. The mean shear bond strength (in MPa) in the descending order of magnitude were Fuji ll LC = 18.10 ± 4.49, Vitremer = 11.89 ± 3.92, Dyract = 8.72 ± 2.42, Fuji ll = 7.04 ± 1.88 and Ketac-Silver = 5.51 ± 1.35. There was significant difference of shear bond strength between Fuji ll LC and the other four materials (p < 0.01). The shear bond strength between Dyract and Vitremer, Dyract and Fuji ll and Fuji ll and Ketac-Silver were not significant difference (p< 0.01). The bond failure of five materials observed by SEM was mainly cohesive.

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Christian Counseling Credit (Supported by Mahidol University Research Grant 1996 J. Dent. Assoc. Thai 47 : 190 _ 199, 1997)

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