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Article
A finite element analysis of the effect of different margin designs and loading positions on stress concentration in porcelain veneers

Author: Hussain F. Al-Huwaizi حسين فيصل الحويزي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2005 Volume: 17 Issue: 2 Pages: 8-12
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: During mastication, stress may concentrate in points in the porcelain veneer which may lead to clinical failure. This study examined whether different finishing lines and different loading positions affect the bond of the porcelain veneers.Materials and methods: A 2- dimensional finite element model was made. Location and magnitude of maximum Von Mises and shear stresses were calculated in porcelain veneer.Results: Stress was concentrated in the butt finishing line more than the deep chamfer and chamfer finishing lines. Stress was concentrated in the incisal portion more than in the cervical portion of the porcelain veneer. The incisal loading exerted stress more than the bonding strength of the bonding agent, and more than the cervical and middle third loading.Conclusion: The best stress distribution was formed around the deep chamfer finishing line. Clinical failure is inevitable in the butt finishing line and incisal loading. Incisal edge fracture of the porcelain veneer may be due to debonding of the bonding agent to the enamel and later fracture of the porcelain veneer


Article
Evaluation of antibacterial action of photosensitizer solution activated by diode lamp and three intracanal medicaments (in vitro study)

Authors: Mohammed C. Hirais --- Hussain F. Al-Huwaizi حسين فيصل الحويزي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: 3 Pages: 43-48
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The elimination of the microorganisms from the root canal systems, an important step for the successfulroot canal treatment. This study was conducted to evaluate the antibacterial effectiveness of the photoactivateddisinfection by using the toluidine blue O and a low- energy light emitting diode (LED) lamp .Materials and method: Sixty single rooted extracted teeth were decoronated, instrumented, irrigated, sealed at theapex and contaminated with endodontic anaerobic bacteria for 7 days to form biofilms in prepared root canals.Group I. Twelve teeth were medicated by photosensitizer (toluidine blue O) solution activated by diode lamp(FotoSan; CMS Dental, Copenhagen, Denmark).Group II. Twelve teeth were medicated by the tricresol formalin.Group III. Twelve teeth were medicated by the camphorated monochlorophenol (CMCP). Group IV. Twelve teethwere medicated by calcium hydroxide (Ca(OH)2) paste. Group V. Without the intracanal medication (controlgroup). The bacterial swabs were taken before and after medication and following the photoactivated disinfectionprocedure immediately and after 7days. The canal contents were swabbed by paper points inserted to the rootcanals, serially diluted and cultured on blood agar. Survival fractions were calculated by counting colony-formingunits.Result: Treatment of the root canals with PAD (fotosan) caused a high significant reduction of the bacterial count,resulting in a 96.39% elimination of root canal bacteria, followed by root canal treated by tricresol formalin (groupII),then CMCP (group III) and Ca(OH)2 (group IV) respectively.Conclusion: Light activated disinfection possesses potent antibacterial action against the anaerobic bacteriacultivated in root canals


Article
An evaluation of the use different techniques of the thermoplasticized obturators on the coronal seal

Authors: Mervat M. Al-Bakri ميرفت البكري --- Hussain F. Al-Huwaizi حسين فيصل الحويزي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2012 Volume: 24 Issue: 2 Pages: 18-20
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The aim of the present study was to evaluate coronal leakage of root canals obturated by varioustechniques.Methodology: Straight single rooted teeth with mature apices (6 groups of 10 teeth each). Root canals wereprepared according to the crown down technique using hand ProTaper system. Endofill root canal sealer and 2.5%sodium hypochlorite was used. Root canals were obturated using cold lateral condensation Thermafil and Soft Coreobturation after root canal filling the six groups was divided into two individual groups of 30 teeth. The first group of 30teeth was kept for 1 week the second 3 week at 37 oC. Teeth were immersed in india ink. Each was split andsectioned longitudinally and the maximum extent of leakage was measured using a stereomicroscopeResults: Leakage occurred whatever filling technique was used the number of teeth with gross leakage decreasedwith time up to 3 weeks. There were significant differences in coronal leakage between the various obturationtechniques after 1 week, and after 3 weeks. No statistically significant differences were found between soft-Core andcold lateral condensation after 1 week and statistically significant differences were found after 3 weeks. There werestatistically significant differences between Thermafil and lateral condensation after 1 week and no statisticallysignificant differences after 3 weeks.Conclusion: Under the conditions of the present study none of the gutta-percha obturation techniques preventedcoronal leakage. Coronal leakage increased during the first week for CLC, Thermafil and Soft-Core obturators, anddecreased after 3 weeks. Coronal leakage in the Soft-Core obturators was higher than Thermafil and CLC after oneweek. Thermafil coronal leakage was lower than others after one week. Coronal leakage in the Soft-Core obturatorshigher than Thermafil and CLC after three weeks coronal leakage was equal in Thermafil and CLC after three weeks


Article
Comparison of apical seal of four obturation techniques after delayed post space preparation

Authors: Ali H. Al-Shimmary علي الشمري --- Hussain F. Al-Huwaizi, حسين فيصل الحويزي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2012 Volume: 24 Issue: special issue 2 Pages: 1-4
Publisher: Baghdad University جامعة بغداد

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Abstract

Backgroound: This in vitro study was conducted to compare the apical seal of four obturation techniques afterdelayed post space preparation.Materials and methods: Sixty simulated straight canals in clear resin blocks were used. The samples which had thesame length, size of apical preparation and taper, were divided into four groups obturated with lateralcondensation, warm vertical compaction, Thermafil, and Softcore obturators. Apexit was used as root canal sealer.Delayed post space preparation was carried out by peeso reamers after one week leaving 6 mm of gutta-perchaapically. The coronal cavity was sealed and the samples immersed in 2 % methylene blue dye for 7 days after whichthe samples were examined by stereomicroscope and calibrated grid to measure apical dye leakage in mm.Results: Vertical compaction leaked significantly less than lateral condensation and Softcore, and Thermafil leakedsignificantly less than Softcore. Both Thermafil and Softcore were comparable to lateral condensation; there was nosignificant difference between vertical compaction and Thermafil.Conclusion: Thermafil and Softcore had no effect on the apical seal when delayed post preparation was consideredand that the apical seal obtained by Thermafil and Softcore was comparable to lateral condensation technique


Article
Micro CT analysis of amount of dentin removal created by SAF vs. ProTaper systems

Authors: Diyar K. Bakir --- Hussain F. Al-Huwaizi حسين فيصل الحويزي --- Raid F. Salman
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2014 Volume: 26 Issue: 3 Pages: 9-12
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Dentin removed during root canal system instrumentation for creating adequate geometry for thecanal and cleaning the canal. A new instrument had been marketed with the aim of optimum shaping of all parts ofthe canal system, however, no information present about the amount of dentin removal compared to conventionalrotary system. This study investigated the amount of dentin removal when the canal instrumented by SAF comparedwith ProTaper by using high resolution computed tomography (micro CT).Materials and Methods: Twenty extracted single canalled teeth were utilized for this study; and randomly divided into2 groups. In the first group, the root canals were prepared by using protaper rotary system till F2 and the root canalirrigated with 1ml of normal saline after each instrument. The root canals in the second group were prepared usingSAF for 2min, with continuous irrigation (normal saline). After rescanning, the amount of dentin removal wascalculated.Result: It was clear that the use of SAF system had increase the amount of dentin removal and in quantity larger thanthat did by ProTaper system & the mean of net difference was (0.288mm ± 0.051). By using t-independent test, therewas highly significant difference between the two groups at (p=0.001), with in favor of the SAF system over ProTapersystem at p< 0.01; in dentin removal quantityConclusion: Root canal preparation with SAF-system resulted in more and effectively removed dentin whencompared with protaper rotary files


Article
Evaluation of the Efficiency of Three Different Obturation Techniques to Obturate the Isthmus Area of Roots Canals Prepared by Two Different Instrumentation Techniques (An In Vitro Study)

Authors: Hasan M. Al-Rammahi حسن الرماحي --- Hussain F. Al-Huwaizi حسين فيصل الحويزي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2016 Volume: 28 Issue: 2 Pages: 14-18
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The isthmus is a difficult area in the root canal complex to manage. The research aimed to evaluatethe efficiency of three different obturation techniques (lateral condensation, EandQ (thermoplasticized guttapercha system) and Soft Core (thermoplasticized core carrier gutta percha system)) to obturate the isthmus area ofroots prepared by two different instrumentation techniques (rotary ProTaper universal and ProTaper Next systems).Material and method: Sixty freshly extracted teeth were randomly divided into two main groups (A and B) of 30 teetheach. Group A was prepared by rotary ProTaper Universal whereas group B was prepared by ProTaper Next system.Each main group was then randomly subdivided into three subgroups of 10 teeth each, to be obturated with thethree obturation techniques. All specimens were then placed in cold cure acrylic mold just from the side of thecrown leaving the root unmolded to facilitate the sectioning process, then three sections were obtained from eachspecimen by using microtome at 2, 6 and 10 mm from the apex. Each section was viewed understereomicroscope(40X) and imaged with digital camera(4X). Each image was managed with image J program tocalculate the surface area of the whole isthmus and that of the gutta percha and/or sealer extended into theisthmus so the collected data represented the percentage of extension degree of gutta percha and /or sealer intothe isthmus(EDGS).Results: The highest mean value of (EDGS) was evident with Soft Core technique in the apical area and wassignificantly higher than that of the EandQ and lateral condensation techniques.Conclusion: Under the conditions of this study, Soft Core system showed a higher efficiency in obturating the isthmusarea than the other obturation techniques


Article
Effect of Tea Tree, Thymus Vulgaris and Nigella Sativa Oils on The Elimination of Enterococcus Faecalis (In Vitro Study)

Authors: Rafid J. Al-Badr --- Hussain F. Al-Huwaizi حسين فيصل الحويزي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2017 Volume: 29 Issue: 1 Pages: 55-62
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The main goal of chemomechanical endodontic treatment is the reduction or elimination of microorganisms from root canal system. The intracanal medicaments were used to enhance the disinfection process. This study was conducted to evaluate the antibacterial effect of thymus vulgaris, tea tree essential oils and cold pressed black seed oil (BSO) against E.faecalis.Materials and methods: E.faecalis was isolated from ten patients in need for endodontic treatment. The sensitivity of E.faecalis to the tested oils was evaluated in different concentrations in agar well diffusion method and compared with calcium hydroxide. The sensitivity of E.faecalis to vapor of the tested oils was also evaluated, in disk vaporization method using inverted agar plate and compared to tricresol formalin (TC) and camphorated monochlorophenol (CMCP).The micro broth dilution method was used to evaluate the minimum inhibitory concentration (MIC) and the minimum bactericidal concentration (MBC) of the tested oils against E.faecalis. The presence of biologically active volatile components of two samples of BSO with different origins was evaluated by the use of high performance liquid chromatography (HPLC).Results: All the tested oils exhibited antibacterial activity against E.faecalis in different concentrations with different levels in agar well diffusion and disk vaporization methods. The MBC was 2μl/mL, for thymus vulgaris oil and 32μl/mL for tea tree and Black seed oils. The vapor forming medicaments (TC and CMCP) induced effective antibacterial action but calcium hydroxide showed a low antibacterial action against E.faecalis. The active volatile components were present in one sample of BSO only (the Iraqi one).Conclusion:The three oil extracts were active against E.faecalis, and the origin, condition of storage and method of extraction may affect the components of cold pressed black seed oil


Article
The cytotoxic effect of different intracanal medicaments

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Background: Different intracanal medicaments are being used in endodontics but little attention is paid to their cytotoxicity. The aim of this research was to assess the cytotoxic effect of the traditionally used intracanal medicaments and compare them with 2% acetic acid.Materials and Methods: Different intracanal medicaments and 2% acetic acid were inoculated in the tibia bone of white albino rabbits for 3, 7, 14 and 28 days. After the incubation time, the animals were sacrificed and the inoculated areas were assessed histopathologically.Results: Two percent acetic acid induced an inflammatory reaction comparable to that of normal saline, and calcium hydroxide that subsided after 14 days. The formaldehyde containing agents, and CMCP induced a more severe inflammatory reaction, with tricresol formalin showing a reaction even after 28 days.Conclusions: Two percent acetic acid was more biocompatible than the other tested root canal medicaments.


Article
Clinical evaluation of the antibacterial action of different root canal medicaments

Authors: Hussain F. Al-Huwaizi حسين فيصل الحويزي --- Aladin Al-Rubayi علاء الدين الربيعي --- Ammer Al-Najjar عامر النجار
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2011 Volume: 23 Issue: special issue Pages: 15-18
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Different intracanal medicaments were evaluated in vivo for their antibacterial action.Materials and methods: A total of one hundred and twenty anterior opened necrotic teeth with no apicalradiolucencies were chosen for this study. Endodontic treatment procedures were performed to the teeth whichwere medicated between the appointments by different intracanal medicaments (Tricresol formalin, formocresol ,2% acetic acid, CMCP, calcium hydroxide, and normal saline as control). The elimination of the bacterial flora ofthese teeth was monitored during the treatment appointments by swabbing the root canals and culturing the swabson blood agar culture media.Results: The teeth medicated by tricresol formalin formocresol and 2% acetic acid experienced the most decrease inthe bacteria count and showed the highest negative cultures. CMCP was next, then calcium hydroxide and lastlynormal saline.Conclusion: The chemo mechanical debridement of the root canals was effective in eliminating most of thebacterial flora but not to the degree of sterility


Article
A comparison between the arbitrary and kinematic intercondylar distances of full mouth rehabilitation patients (An in-vivo study)

Authors: Ma'an R. Zakaria معن رشيد زكريا --- Hussain F. Al-Huwaizi حسين فيصل الحويزي --- Widad A. Alnakkash وداد النقاش
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2012 Volume: 24 Issue: special issue 1 Pages: 11-17
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The intercondylar distance can change the radius of movement and affect the arcs traveled by thecusps during lateral mandibular excursions in the horizontal plane. The aim of this study was to record and comparethe intercondylar distances of male and female patients requiring full mouth rehabilitation by using arbitrary andkinematic face-bows.Materials and methods: Interfacial widths of fifty asymptomatic male and female full mouth rehabilitation patientswere recovered from arbitrary and kinematic face-bows. Intercondylar distances were recorded and statisticallycompared.Results: Results indicated that arbitrary and kinematic intercondylar distances of male patients were significantlygreater than females indicating asymmetry in locating the condylar axes of rotation in both sexes.Conclusion: The majority of intercondylar distances of patients were more than 110 mm indicating that an articulatorwith an adjustable intercondylar distance would be more anatomically correct for the treatment of full mouthrehabilitation cases

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