ABSTRACT
The purpose of this experimental study was to investigate the shear bond strength of three new adhesive systems to enamel and dentin of permanent human teeth using three new etch and rinse and self-etch adhesive systems. Sixty intact caries-free third molars were selected and randomly divided into 6 groups. Flat buccal and lingual enamel and dentin surfaces were prepared and mounted in the acrylic resin perpendicular to the plan of the horizon. Adhesives used in this study were Tetric N-Bond, AdheSE and AdheSE-One F [Ivoclar/Vivadent, Schaan, Liechtenstein]. The adhesives were applied on the surfaces and cured with quartz tungsten halogen curing unit [600 mW/cm2 intensity] for 20 s. After attaching composite to the surfaces and thermocycling [500 cycles, 5-55[degree]C], shear bond strength was measured using a universal testing machine at a crosshead speed of 0.5 mm/min. The failure modes were examined under a stereomicroscope. The data were statistically analyzed using T-test, one-way ANOVA, Tukey and Fisher's exact tests. In enamel, Tetric N-Bond [28.57 +/- 4.58 MPa] and AdheSE [21.97 +/- 7.6 MPa] had significantly higher bond strength than AdheSE-One F [7.16 +/- 2.09 MPa] [P<0.001]. Tetric N-Bond had higher bond strength than AdheSE but there was not any significant difference between them [P=0.093]. In dentin, there were significantly differences among all adhesives [P<0.001]. Tetric N-Bond [20.62 +/- 3.03 MPa] showed the highest and AdheSEOne F [6.54 +/- 1.13 MPa] had the lowest value. The bond strength in enamel was higher than that observed in dentin and the difference was significant in Tetric N-Bond [P=0.044] and AdheSE [P<0.001] groups. There were no significant differences in the mode of failures among groups [P>0.05]. Shear bond strength to dentin in Tetric N-Bond [etch and rinse system] was higher than self-etch adhesives [AdheSE and AdheSE-One F]. The bond strength to enamel and dentin in two-step self-etch [AdheSE] was higher than one-step self-etch [AdheSE-One F].
ABSTRACT
Background: peripheral giant cell granuloma is one of the reactive hyperplastic lesions of the oral cavity, which originates from the periosteum or periodontal membrane following local irritation or chronic trauma. The purpose of this study was to present the clinical characteristics of peripheral giant cell granuloma in a group of Iranian population
Methods: a series of 123 consecutive confirmed cases of peripheral giant cell granuloma after biopsy were evaluated. Age, sex, anatomic location, consistency, etiologic factor, pain and bleeding history, color, surface texture, and pedicle situation were recorded and were analyzed by chi-square test and values were considered to be significant if P < 0.05
Results: age ranged from 6 to 75 years [mean 33 years]. Women affected more than men [M/F 1:1.1]. Peripheral giant cell granuloma was seen in the mandible more than in the maxilla and in the anterior region more than in the posterior region. In most cases, lesions were pink, pedunculated and had non-ulcerated surface. In less than half of the cases, there was no history of bleeding and also pain was rarely reported. Calculus was the most common etiologic factor
Conclusion: the results confirmed that the clinical features of peripheral giant cell granuloma in a group of Iranian population are almost similar to those reported by other investigators