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Article
The Effect of Various Surface Treatment Adhesives and Composite Materials on Repair Strength of Composite Resin

Author: Nadia H Hasan
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2012 Volume: 12 Issue: 1 Pages: 126-134
Publisher: Mosul University جامعة الموصل

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Abstract

Aimsof the study:The aim of this study is to evaluate the effect of a flowable composite and total etch adhesive on shear bond strength of repaired composite with a different types of tooth colored res-torations (microhybrid, nanohybrid, and ormocer). Materials and Methods Ninety Teflon mold (4 mm ×2mm), of Tetric® Ceram prepared then divided into two main groups 1st control ( without etch-ing ), 2 ed etched with 37 phosphoric acid. Both groups were divided into three subgroups according to a type of adhesiveapplied, 1st control, 2 ed the Excite® and in 3ed the tgflow appliedThe second split of Teflon mold (4mm×1mm)placed onto the prepared specimenEach subgroup (1st control, 2 ed the Excite® and in 3rd the tgflow) were farther divided into three subgroups which entrain filled as fallow: 1st split filled with a Tetric® Ceram, in 2 ed split filled with Tetric NCeram, and in 3 rd. split filled with Admira. Shear bond strength was measured by using Universal Testing Machine, and mode of failure examined by a stereomicroscope. Results: No significant difference in the surface treatment groups. For the adhesive, Tgflow showed superior shear value (3248 MPa) comparing to other adhe-sives while for the composite materials, The Tetric NCeram composite showed superior value of shear strength (2821MPa) comparing to other materialsConclusions: Phosphoric acid has no effect on shear value of repaired composite while Tgflow and Tetric NCeram give an improvement in its shear valueAll composites exhibited cohesive and adhesive type of failure.


Article
The correlation between certain facial and dental measurements that influence dental aesthetics “Cephalometric study”

Author: Nadia H Hasan
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2005 Volume: 5 Issue: 1 Pages: 6-14
Publisher: Mosul University جامعة الموصل

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Abstract

The purpose of the present study was to assess and determineif the correlation between certain facial measurementswas significant to recommend their use as reliable aestheticfactors for selection of suitable tooth moulds for anterior teethrestoration.The materials for this study included 50 cephalometricradiographs for selected undergraduate students of DentistryCollage, Mosul University; 25 males and 25 females. The ageranged from 18–25 years old with normal occlusion.The data were analyzed by using Minitab system and theresult confirmed that certain facial measurements considereddirectly to determine the outline form to restore anterior teethsuch as tooth width at the incisor edge, incisor tooth length,intercanine distance, the ratio of incisor tooth length and toothwidth at the incisor edge, bi–incisors width, and bi–orbitalwidth, while the others, bi–zygomatic width, intermolar distance,anterior facial height, and the ratio of anterior facial heightand bi–zygomatic width, were indirectly indicated. Alsothere was a significant difference between male and femalegroups with different facial measurements. The ratio of theanterior facial height to bi–zygomatic width for the total samplewas 0.93 mm, while that for the tooth length to tooth widthwas 0.81 mm. It could be concluded that certain facial measurementsrecommended as reliable aesthetic factors for selectionof suitable tooth moulds for anterior teeth restoration.


Article
The Influence of Er: YAG Laser, Alumi-num oxide and diamond bur on surface treatment of Aged Composite Resin to Repair Restoration

Author: Nadia H Hasan
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2012 Volume: 12 Issue: 2 Pages: 257-265
Publisher: Mosul University جامعة الموصل

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Abstract

Aim of this study is to investigate the effect of Er: YAG Laser, the sand blasted with aluminum oxide and wearing with diamond bur as a surface treatment to the bond strength of repaired composite resin after aged. Materials and Methods: Sixty Teflon mold (4mm×2mm), of Tetric® Ceram prepared. The specimens were randomly separated into six groups and undergo the following surface treatments: G1 no treatment (control), G2-G4 treated with a different amount of laser energy (40, 60, 80 mJ Er: YAG laser respectively) under a 2Hz frequency, G5 wearing with diamond bur, and G6 sandblasted with 50μm aluminum oxide. All 6 groups divided into two subgroups,1st control,2ed etched with 37% phosphoric acid. Bonding material was applied and the second split of Teflon mold (4mm×1mm) placed onto the prepared specimen, filled with Tetric N-Ceram. The shear test was done using the Uni-versal testing machine. Results: Significant differences of all variables, laser 60,40mj surface treatment displayed superior shear strength (45.24, 45.03 MPa respectively), aluminum oxide showed low shear value (32.48 MPa). Phosphoric acid showed the highest shear value (40.47 MPa) in compare to the control one (31.62 MPa). Conclusions: Using of Er:YAG laser improve the shear value of repaired composite in comparing with a diamond bur and aluminum oxide. Conditioning aged composite surface with a phosphoric acid enhancing its adhesive result.


Article
Psychosocial profile of patient with missing teeth and refuses treatment

Authors: Nadira A Hatim --- Sameer A Muhammed --- Nadia H Hasan
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2003 Volume: 3 Issue: 2 Pages: 88-95
Publisher: Mosul University جامعة الموصل

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Abstract

This study aimed to assess the psychosocial and medical factors that are related to refusal of prosthetic replacement, as well as to give a treatment for such problem. Also the number and distribution of missing teeth in partially edentulous individuals according to Kennedy classification was evaluated, as well as to assess the prevalence of Kennedy classification in partially edentulous patients in rural areas. The study was conducted in Al– Humaidat village that is located at the Tigris river about 25 Km to the northern west of Mosul City. Six hundred and twenty three individuals aged 4–85 years were selected randomly from houses and schools (275 females and 356 males). Clinical examinations were carried out using dental probe, mirror and dental chair. The results were calculated according to special chart depending on Crown–Crisp Experimental Indexes. The results of this study showed that the incidence of tooth loss increases with age group between 26–35 years. Class III Kennedy classification recorded higher percentage (57.14%) compared with Class II, IV and I. It was shown that 63% of patients refused the replacement of their missing teeth, 72.86% of which refused replacement due to psychological reactions. The anxiety score showed a low percentage (28.09%) in comparison with other scores of psychological reactions. Percentage of smoking tobacco was not more than 19.26% of total samples.


Article
Examination of the Iraqi –product lathe– cut dental amalgam alloy by using “Taha Indicator”. Microscopic investigation

Authors: Lamia T Rejab --- Nadia H Hasan --- Munther N Kazanj
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2004 Volume: 4 Issue: 1 Pages: 40-43
Publisher: Mosul University جامعة الموصل

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Abstract

Many dental materials have been marketed locally in the last few years. The dentist should understand the selection principles that based on scientific tests to choose the product. Dental amalgam alloy is one of the dental materials that used in restorative dentistry for restoration decayed teeth. The primary objective of the study is to examine the lathe–cut Iraqi dental amalgam alloy (Al–Rafidain) microscopically. The examination of alloy powder particles shape was made with transmitted light microscope using “Taha Indicator” instead of reflected light microscope or electron microscope. The results showed that the examination with transmitted light microscope by using “Taha Indicator” give obvious and clear image of the alloy powder particles and also showed that Al–Rafidain amalgam alloy powder has large and irregular shape particles that may give inferior physical properties to the product, so more evaluation and examination by other related tests may be needed.


Article
The Effect of Two Bonding Agents Genera-tions On Microleakage Of Composite Resin Using Two Light Curing Systems.

Authors: Nadia H Hasan --- Abdulla MW AL-Shammaa --- Emad F AL-Khalidi
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2011 Volume: 11 Issue: 1 Pages: 139-145
Publisher: Mosul University جامعة الموصل

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Abstract

Aim: To evaluate the effect of two bonding systems and two curing systems on sealing ability of class V composite restorative materials. Materials and methods: This study was performed in vitro on 40 caries free upper first premolar teeth. The Standardized class V cavity preparation on buccal and lin-gual surfaces of each tooth was done. Then the teeth were randomly divided into two major groups each of twenty. 40 cavities were performed on these teeth and the first group7th generation bonding agent (i Bond) were applied according to the manufacturer instructions and single increment of univer-sal composite (XRV Herculite) from kerr were applied and twenty of the cavities were cured with con-ventional light cure device (astralis-5) and the other twenty cavities were cured with a LED. While the second group 5th generation (Excite bonding agent) applied according to the manufacturer instructions. And filled with universal composite (tetric).Twenty of the cavities light cured with conventional light cure device and the other twenty cavities cured with LED light cured device. Then the teeth were stored in normal physiological saline in an incubator at (37Co) half of each sub group (10 cavities) were stored for one day and the second half stored for one week. Then the teeth were thermo cycled for (200) cycles, after thermo cycling all teeth were immersed in a freshly prepared solution of 2% methylene blue for (24) hours at (37Co). Results: The results showed that there was no statistically significant difference between samples cured using conventional light curing system and those cured using LED light curing system. The type of bonding system and composite material used in this study had no sig-nificant effect on reducing microleakage. Samples aged for seven days produced significantly higher levels of microleakage than that for one day. Conclusions: All samples in this study showed microlea-kage with different levels. Microleakage increases as the age increases. Neither the types of light curing system nor the types of bonding were able to reduce microleakage.

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Article
Bond Strength of Aluminum Oxide Surface Treatment on Sandwich Restoration

Authors: Maha A AL-Murad --- Sawsan H Al–Jubori --- Nadia H Hasan
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2012 Volume: 12 Issue: 1 Pages: 89-95
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: The aim of this study is to evaluate the effect of aluminum oxide as a surface treatment on shear bond strength of etched and non-etched GIC for sandwich restoration with different types of tooth co-lored restorations .In addition, failure type was assessed. Materials and Methods: Sixty Teflon molds (5mm diameter and 4mm height) of a chemically cured GIC were prepared. They were divided into two main groups 1st control, 2 ed air-abraded with 50μm aluminum oxide particles. Both groups were sub divided into two subgroups 1st control, 2 ed etched with 37%phosphoric acid. Bonding material was applied to the treated surface of all groups and cured. The second split of Teflon mold (3mm di-ameter and 4mm height)was placed onto the prepared specimenEach subgroups (1st control, 2 nd etched with phosphoric acid) were farther subdivided into three subgroups which entrain filled as fal-low: 1st split filled with a tg microhybrid, in 2 ed split filled with tg fine glass, and in 3 rd split filled with Ceram X. Shear bond strength was measured by using Universal Testing Machine, and mode of failure examined by a stereomicroscope. Results: Anova test showed that there was a highly significant difference for all variables except acid etching effect. Aluminum oxide surface treatment displays supe-rior shear (2.280MPa). tg micro hybrid composite and Ceram X showed highest shear bond strength. Conclusions: Phosphoric acid etching did not improve shear value of sandwich restorations, while uses of aluminum oxide surface treatment, tg micro hybrid and Ceram X filling material gave an improve-ment on it. The failures were mainly cohesive within the GIC except tg fine glass was cohesive in fill-ing material itself.

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