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Article
Fracture resistance of premolars with bonded amalgam restorations

Authors: Abdul–Haq A Suleiman --- Mohammad Gh Hamdoon
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2003 Volume: 3 Issue: 2 Pages: 156-160
Publisher: Mosul University جامعة الموصل

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Abstract

The aim of this in vitro study is to evaluate the fracture resistance of premolars with three surface amalgam restorations. Fifty premolars were used, and divided into five groups. The teeth in group one remains intact whereas the teeth in the second group prepared and not restored. The teeth in the third group prepared and restored with amalgam only. In groups four and five, the amalgam restorations were lined with All–Bond 2 and Scotchbond Multi Purpose Plus respectively. After thermocycling, the teeth were tested under universal compression machine at a crosshead speed 5 mm/minute. Data were analyzed using one way Analysis of Variance and Duncan’s Multiple Range Test. The results of this study indicates that both Scotchbond Multi Purpose Plus and All–Bond 2 increase the fracture resistance as compared to the control groups (groups two and three). The results of this study also show no significant difference between the two bonding agents regarding teeth fracture resistance.


Article
Effects of Curing Modes of Light Emitting Diode on Shear Bond Strength of Resin Composite

Authors: ALi M Rasheed --- Mohammad Gh Hamdoon --- Kasim A Mohammad
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2008 Volume: 8 Issue: 2 Pages: 168-176
Publisher: Mosul University جامعة الموصل

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Abstract

Aim: To evaluated the SBS of three resin composites (Tetric Flow, Tetric and Heliomolar) bonded to dentin and cured by different curing modes utilizing light emitting diode (LED) light curing unit. Materialsand Method: Buccal dentin of 90 upper premolars was expose and Clearfil SE Bond applied and cured prior to restorative procedure. Samples divided into 9 groups (3 groups for each composite type),photoactivation of groups of each composite was carried out using three modes: Continuous (CO: 600 mW/cm2 for 40 s), Soft-Start (SS: 100 mW/cm2 for 10 s + 600 mW/cm2 for 30 s) and Pulse-Delay (PD:100 mW/cm2 for 3 s + 3 min wait + 600 mW/cm2 for 37 s). Samples thermocycled and loaded at toothcomposite interface at 1 mm/min cross head speed until failure. Results: Two-way ANOVA (p < 0.05) followed by Duncan multiple range test revealed that SBS of SS mode (21.5 Kg) is significantly higherthan SBS of both CO (18.1 Kg) and PD (18.7 Kg) and its also revealed that although SBS of Tetric Flow (21.2 Kg) is higher than that of Tetric (20.1 Kg) and both are significantly higher than that of Heliomolar (16.9 Kg).Conclusions: Less material’s rigidity along with slower polymerization reaction by SS mode result in higher SBS due to lesser contraction stress at the adhesive interface

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