Abdolrahim Davari, Jamshid Bagheri, Jalil Modaresi, Amir Moeintaghavi, Fatemeh Ezoddini Ardakani, Hossein Fallahzadeh.
Comparison of bond strength of different restorative materials in mandibular anterior teeth class V restorations.
J Pak Dent Assoc Jan ;16(4):169-73.

OBJECTIVE: The aim of the present study was to determine the effect of different restorative materials on fracture resistance of mandibular teeth with class V restorations. MATERIALS AND METHODS: One hundred intact mandibular incisors were selected and divided into ten groups with 10 samples in each. Three types of restorative materials; Tetric flow composite (Vivadent Ets, Schaan/Liechtenstein ), Compoglass (Vivadent Ets,Schaan/Liechtenstein) and light curing glass ionomer (GC Corporation Tokyo JAPAN) were used in our study. Each of these materials were applied in cavities with 2,3 and 4 mm widths. Group 10 was considered as the control group in which no restorations was done. All teeth were mounted in cold cure acrylic resin (Tray Resin II, Shofu Inc, Kyoto, Japan) and the samples were tested by applying shear force with cross head speed of 5mm/min in a universal testing machine (Instron corp., Canton, MA,USA). Data were analyzed with two way ANOVA and Dunnet multiple comparisons test using SPSS 10 software package. RESULTS: Regardless of the types of materials, cavities with 4mm width had less bond strength than those with 2 and 3 mm widths (P-value= 0.555). In the Compoglass and glass ionomer L.C. groups, cavities with 2 and 3mm widths had significant greater strength than cavities with 4mm width (P-value= 0.0002). In groups with Tetric flow restorative material no significant difference in shear force among different widths of cavities were detected (P-value= 0.4948). The mean shear force in this group was comparable with the control group (P-value= 0.0001). In cavities 2 & 3 mm widths, there was not any significant difference in shear force between Tetric flow and compoglass restorative materials. Glass ionomer and Tetric flow had the least and the highest shear bond strength ,respectively. CONCLUSIONS: The results showed that although all the restorations need an average load more than masticatory forces in the mouth to fail, but Tetric flow composite with combination of chemical adhesion properties and optimum elastic characteristics was proven to be the restorative material of choice for cervical Defects with different widths.

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