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Article
Evaluation of accuracy of two electronic apex locators of different frequencies in dry and wet condition (In vitro study)

Author: Ma'an M.Nayif
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2011 Volume: 11 Issue: 3 Pages: 303-309
Publisher: Mosul University جامعة الموصل

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Abstract

Objective: To evaluate and compare the precision of two electronic apex locators (C-Root I Apex locator III, Guangdong, China & AFA Apex Finder 7005, Orange, USA) of dual and multi-frequency dependent impedance in dry and wet condition. Materials and Methods: Twenty-five straight single-rooted teeth with mature apices were used. A flat coronal reference point prepared followed by access preparation and canal widening with Gates Glidden drill. A size 15 K-file introduced inside the canal so that the actual canal length to the major foramen was determined visually under illuminated magnified lens (x5). Teeth were embedded in alginate mold then electronic measurements with two locators of different impedance frequency were made to the apex reading in dry canal condition and with presence of physiologic saline solution using same file. Data was analyzed with ANOVA and T-test ( =.05). Results: Comparison of apex locators reading show no significant difference between the locators at both conditions of the canal (p>0.05). No significant differences were found between the actual working length and electronic length for either apex locators (p>0.05). In contrary both EALs measurements show significantly larger absolute difference in presence of solution than value in dry condition (p<0.05). Conclusion: Both apex locators were reliable in determining the electronic working length of the teeth

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Article
Tensile Bond Strength of Resin Composite to Er,Cr:YSGG Lased Dentin Bonded With Different Adhesive Systems

Authors: Ula A. Fathi --- Ma,an M. Nayif
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2015 Volume: 15 Issue: 2 Pages: 456-462
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: Tensile bond is important for assessing the success of adhesive restorative materials. The aim of this study is to evaluate the tensile bond strength of resin composite restoration to Er,Cr:YSGG lased dentin bonded with three types of adhesive systems. MATERIALS AND METHODS: Occlusal enamel of eighteen molars samples was removed to expose the underlining dentine. Er,Cr:YSGG laser irradiation was performed to central dentin. Samples were assigned randomly to three groups (N = 6): Group Ι: dentin was treated total etch adhesive (Adper single bond, 3M ESPE); Group II: treated with all in one self—etch adhesive (Adper easy one, 3M ESPE); Group III: treated with two step self—etch adhesive (Clearfil SE bond, Kurary). A translucent plastic tube was fixed and filled incrementally with hybrid resin then small metal screw with ring head was embedded in last increment. Samples were stored in distilled water at 37°C for 24 hours. Tensile bond strength was measuredd using universal testing machine (Digital Force Gauge IMADA CO., LTD, Japan), the failure mode was evaluated. Then statistical analysis was done include descriptive, one way analysis of variance test, and Post Hoc tests. RESULTS: A significant differences in tensile bond strength were observed among groups (p < 0.05). Total etch adhesive bonded demonstrate significantly higher tensile bond strength value than one step self–etch and two step self–etch adhesives (p < 0.05). No significant differences were observed between one step self–etch and two step self–etch adhesives (P>0.05). CONCLUSION: The tensile bond strength of resin composite to Er,Cr:YSGG lased dentin was influenced by adhesive type. Total etch adhesive bonded had higher tensile bond strength than one step and two steps self–etch adhesives.


Article
Influence of Adhesive Systems on Microleakage Pattern of Composite Resin Restorations

Authors: Eman A Abdulkadir --- Ma´an M Nayif
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 3 Pages: 547-554
Publisher: Mosul University جامعة الموصل

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Abstract

Microleakage is important for assessing the success of adhesive restorative materials. The aim of this study was to evaluate the microleakage of resin composite restorations bonded with three types of adhesive systems. MATERIALS AND METHODS: Twenty four sound human third molars were used. Class V cavities were prepared on the buccal surface by a diamond cylinder bur No. (1543M). Samples was assigned randomly to three groups (N = 8): Group Ι: Cavities were treated with total etch adhesive system (Adper Single Bond 2Adhesive, 3M ESPE, USA). Group II: Cavities are treated with one step self-etch adhesive system (OptiBond All In One, kerr, USA). Group III: Cavities were treated with two step self-etch adhesive system (CLEARFIL SE BOND, kurary, Japan). Cavities were restored in bulk technique withresin composite (Ceram X, DENTSPLY, USA). Restorations were polished and after storage in water for 24 hours at 37°C the samples were thermocycled between 5-50°C for 300 cycles in water baths then immersed in methylene blue solution for 24 hours. Dye leakage was assessed by examining longitudinal sections in a stereomicroscope at X10magnification. Data were analyzed with Kruskal-Wallis test and Mann-Whitney test at 5%significant level. RESULTS: A significant differences in microleakage were observed among restorations (p < 0.05).One step adhesive bonded restorations demonstrate significantly higher leakage value than two step. No significant differences were observed between total etch adhesive and self-etch adhesive (p>0.05).CONCLUSIONS: The microleakage of resin composite restoration was influenced by adhesive type. One step self-etch bonded restoration was more prone to leakage than total etch and two step bonded restoration


Article
Changing in Working Length and Canal Dimension Following Instrumentation with Hand and Rotary Instrument

Authors: Ma,an M.Nayif --- Manal A.Sultan --- Amer A.Sultan
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2015 Volume: 15 Issue: 2 Pages: 431-437
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: This study evaluated changes in working length (WL) and root canal dimension after instrumentation with hand instruments (St.St, NiTi) and rotary systems (RaCe, ProTaper). Materials and Methods: Twenty four resin blocks with a curve canal of 33°angle at (14mm) were selected for this study. Working length was measured by a digital measurement using a number (10k) file under stereomicroscope at 40X. The specific sequence of instrumentation was system according to manufacturer’s recommendation. The working length of the canal was measured again between each file and at the end of instrumentation. Pre and post-instrumentation microscopic photographs were taken and measurements of the root canal dimension change were measured with an image analysis programme . The difference in working length was analyzed using ANOVA and Duncan’s test at 5% level of significance. Result: Statistical analysis showed that there was no significance difference in the changing of the working lengths and canal dimension between the two rotary systems (ProTaper,RaCe). While there was a significant difference in the changing of the canal length and dimension between the two rotary systems (ProTaper,RaCe) and the hand instruments (St.St, NiTi). The amount of variation in working length and canal dimension obtained with both types of rotary instruments, was significantly less than that produced by hand instruments. Conclusion: The variation in working length were clinically not very significant between the two rotary NiTi instruments (ProTaper, RaCe)while it was significant with the hand instrument (St.St and NiTi).


Article
The effect of indirect veneering materials as light interpose on microhardness of dual cured resin cements

Authors: Maha A AL-Murad --- Ma’an M Nayif
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 2 Pages: 290-295
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: The aim of this study was to investigate the influence of different indirect veneering materials on the microhardness of dual-cured resin cements. Materials and Methods: Three disc specimens (2.0 mm height and 5mm diameter)were prepared from the following indirect restorative materials (Indirect composite resin, Gardia-GC, JAPAN, Feldspathic porcelain VITA VIMK 95-Germany and Zirconia veneer, VITA-Zahnfabrik, Germany). Two dual cure resin cements were used ( Variolink II, Ivoclar Vivadent AG, Liechtenstein and Bis-Cem, Bisco-Schaumburg, USA). Twenty specimens were prepared from each type of cement and divided into 4 groups, one as control and others as indirect restorative materials. After mixing cements were placed in a plastic mold (5mm diameter and 1mm height ) and light activated directly or through veneering discs for 30s using LED light at 500mW/cm2. Specimen subjected to three indentation using Vicker hardness tester with load of 50gm for 15 second. Data were statistically analyzed using ANOVA and independent t-test at (α= 0.05). Results: For both cements the control groups showed higher hardness value than other groups. Specimens cured through indirect resin composite shows the highest microhardness while those cured through Zirconia shows the lowest value. Variolink II resin cement demonstrated higher microhardness than Bis-Cem cement regardless of the curing condition. Conclusions: Type of indirect restorative veneering materials influence microhardness of resin cement luting agent.

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