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حاله الاكتئاب وعلاقتها بحاله الفم والخصائص الفزيوكيميائيه لدى طلاب المدارس من فئه عمر 15 سنة في مدينة الصويره - حافظة واسط - جمهورية العراق == Depression Status In Relation To Oral Health Condition And Salivary Physiochemical Characteristics Among 15 Years Old School Students In Al - Swera City - Wassit Governorate - Iraq

Author name: هدى سلمان خیاله

Supervisor name: بان صاحب ذیاب

General topic: Dentistry

Specific topic: Preventive Dentistry

Degree: Master

University: University of Baghdad

Language: English

University location: Baghdad

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Abstract: Background : Depression is a common mental disorder that presents with depressed mood, its affect oral health through its effect on salivary function. The aims of this study were to assess the relation of depression status on prevalence and severity of dental caries and gingival inflammation among students aged 15 years in relation to salivary physical (flow rate and viscosity) and chemical characteristics concentration of (total protein, zinc, copper, chromium and lithium).Materials and methods : The total sample involved 800 students (males and females) aged 15 years old that were selected randomly, the depression status was measured using Children Depression Inventory (CDI) index that divided the students with depression into four groups according to severity of depression (low or average grade, high average grade, elevated grade and very elevated grade). The diagnosis and recording of dental caries was made by using Decay, Missing, Filled surface index (DMFs), according to the criteria of Manji et al (1989), while gingival condition was evaluated by using the gingival index by L?e and Silness, (1964). Salivary samples were collected under standardized condition from 30 students with very elevated grade and 30 students with low average grade, and then analyzed for measuring salivary flow rate and viscosity, in addition to the estimation of salivary elements (total protein, zinc, copper, chromium and lithium).Results : The prevalence of depression was 100%. The DMFs was lower among students with high average grade than other grades of depression with nonsignificant difference. The severity of dental caries was higher among students with elevated grade concerning D1, D3 and in very elevated grade of depression concerning D2, D4 with highly significant among D4 (P = 0.01). The prevalence of gingivitis in present study was found to be 100%, mild gingivitis occurrence found higher among low or average grade than other grades, but moderate gingivitis was more among very elevated grade, while sever gingivitis was absent. Salivary analysis demonstrated that the salivary flow rate was non significantly higher among students with low or average grade of depression than very elevated, while the viscosity of saliva was not significantly higher among students with very elevated grade. The data analysis of salivary elements found that the total protein and copper was higher among students with very elevated grade while other elements show the opposite result with significant difference concerning copper and zinc among females in very elevated grade, while others with not significant.Conclusion : The results of the current research revealed that caries experience and gingival inflammation increase with depression that has an adverse effect on salivary physicochemical characteristics. There were changes in saliva variables between low or average grade and very elevated grade of depression.

تاثير متسلل التسوس ممزوج مع او بدون مواد لاصقة تقليدية على ختم المينا السليمة : دراسة مختبرية == The Influence of Caries Infiltrant Combined With And Without Conventional Adhesives On Sealing of Sound Enamel (In Vitro Study)

Author name: مروة بلاسم محمد الجيبةجي

Supervisor name: ضياء جعفر الدباغ

General topic: Dentistry

Specific topic: Orthodontics

Degree: Master

University: University of Baghdad - Faculty Of Dentistry - Orthodontics Department

Language: English

University location: Baghdad

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Abstract: The formation of white spot lesions around fixed orthodontic attachments is a common complication during and following fixed orthodontic treatment, which hinder the results of a successfully completed case.The aim of the study was to assess the effectiveness of the Caries Infiltrant (ICON®) on prevention of caries on the smooth enamel surface when applied alone or combined with conventional adhesives. To achieve this objective, seventy eight human premolar enamel discs were randomly assigned to six groups (n=13). The discs were etched and treated with resins of different monomer content forming the following groups : (1)Untreated etched samples served as the negative control, (2) ICON® (DMG), (3) Adper™ SB 2 (3M ESPE), (4) Heliobond (Ivoclar Vivadent), (5) ICON®+ Adper™ SB 2 and (6) ICON®+ Heliobond. Specimens were subjected to demineralization by immersion in hydrochloric acid (pH 2.6) for 18 days. Calcium dissolution into the acid was assessed by photometric test via spectrophotometer at 24 hour intervals.The results revealed that, there was a highly significant difference between the sealed groups and the unsealed (untreated) one (p?0.00) indicating that the unsealed specimens showed the highest amount of Ca ion loss among all other groups. Additionally, there was no significant difference between untreated specimens and the ICON® sealed ones. While, Heliobond decreased the Ca ion loss significantly compared to the untreated specimens and Adper™ SB 2 performed significantly better than both ICON® and Heliobond. Furthermore, the combination of ICON® with either Adper™ SB 2 or Heliobond served as the best protective measures and maintained the protective effect during the whole experiment period.Therefore, within the limitations of this in vitro study, it could be concluded that the use of low - viscosity Caries Infiltrant prior to application of the tested conventional adhesives increases their protective effect against demineralization.

تقييم تاثير بلازما النيتروجين المتوهج لغرسة التيتانيوم التجاري على الترابط العظمي بالتحليل الميكانيكي والتحليل النسيجي == Evaluation of The Effect of Glow Plasma Nitriding of Commercially Pure Titantium Dental Implant On Osseointigration Through Mechanical And Histomorphometric Analysis

Author name: حسن جواد فرحان المسعودي

Supervisor name: شذى سليم الامير

General topic: Dentistry

Specific topic: Dentistry

Degree: Higher Diploma

University: University of Baghdad

Language: English

University location: Baghdad

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Abstract: الاتجاه الجديد للغرسات هوايجاد المواد التي تسرع عملية بناء العظم في السطح البيني للعظم والغرسه وتحسين الاندماج العظمي من اجل توفير التحميل الفوري والمباشر بعد وضع الغرسات وتقليص فترة الانتظار التي تكون مزعجه وغير مريحه للمرضى.الاهداف.تقييم تاثير طلاء ال | Introduction : The new trend of implants is to find materials which accelerate bone formation in bone implant interface and improve osseointegration to provide immediate or early loading after placement in addition to eliminate the waiting period which is usually uncomfortable and disturbs patients. Aim of study : To evaluate the effect of plasma nitride treatment of screw shaped commercially pure titanium dental implant on bond strength at bone implant interface by torque removal test and histomorphometric analysis after 2 and 6 weeks in comparison to non treated one.Materials and methods : Commercial pure titanium plates and screws were plasma nitrided for 10h using glow plasma nitride apparatus. X - ray diffraction (XRD) analysis , scanning electron microscope examination were carried out on the nitride surfaces of the plates ,contact angle measurement (Wettability) was done by applying drop of saline and blood on the nitrided surface and compared to control. The femur of 10 white New Zealand rabbits were chosen as implantation sites. The femur of each rabbit received two screws, one plasma nitride treated and one non treated and a total of 40 screws were implanted. Torque removal test was performed(by digital torque meter) to measure bond strength between implant and bone, after 2 and 6 weeks healing periods. For each period of time 18 screws were tested for the torque required to remove the implant from the bone and 2 screws were kept for histological examination. Results : The results revealed that the mean removal torque values for the plasma nitride treated implants was significantly higher than the non treated implants and over the two periods of time. There was an increase in the bond strength (torque value) of bone - implant interface with time. The torque removal force for plasma nitride implants after 2 and 6 weeks was (30.22, 59.56 N.cm ,respectively) and for non treated implants after 2 and 6 weeks were ( 23.61,56.11N.cm, respectively) and new bone formation ratio for plasma nitride treated implants after 2 and 6 weeks(3.36, 4.72 , respectively) and for non treated after 2 and 6 weeks(1.56, 3.04, respectively). Conclusion : Plasma nitriding of Cp Ti screws significantly increased the torque removal value and new bone formation ratio at 2 and 6 weeks compared with the non treated implant.Dental implant, Osseointegration, Digital torque meter

مواصفات الاطباق وادراكه والحاجة والطلب على تقويم الاسنان لدى الطلاب البغداديين بعمر 13 سنة : دراسة مقارنة مسحية ميدانية == Occlusal Features, Perception of Occlusion And Orthodontic Treatment Need And Demand Among 13 Years Aged Baghdadi Students (A Comparative Cross Sectional Epidemiological Study

Author name: زينب محمد رضا الجلبي

Supervisor name: فخري عبد علي الفتلاوي

General topic: Dentistry

Specific topic: Orthodontics

Degree: Master

University: University of Baghdad - Faculty Of Dentistry - Orthodontics Department

Language: English

University location: Baghdad

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Abstract: The study was conducted to assess the distribution, prevalence, severity of malocclusion and orthodontic treatment need in Baghdad governorate in relation to gender and residency, and whether it has increased or not over 12 years by comparison with previous survey in Baghdad.A multi - stage stratified sampling technique was used in this investigation to make the sample a representative of target population. The sample consisted of 2700 (1349 males and 1351 females) intermediate school students aged 13 years representing 3% of the total target population.A questionnaire was used to determine the perception of occlusion and orthodontic treatment demand of the students and the assessment procedures for occlusal features by direct intraoral measurement using veriner and an instrument to measure the rotated and displaced teeth. In summary the followingresults were obtained : 1 - 7.7% of the sample had some type of orthodontic treatment or consultation.2 - 39.1% of the students answered that they have malaligned teeth, being significantly more in female than males.3 - of the students who stated that they have malaligned teeth, 26% reported that they had crowded teeth, 26.6% had spaced teeth, 22.4% had protruded teeth and 25.7% had rotated and displaced teeth.4 - Regarding the answers of the effect of mal - aligned teeth, 70.3% answered that it affects their appearance, 17.7% chewing, and 7.7% speech while 4.1% answered that mal - aligned teeth did not affect appearance, chewing or speech.5 - the most common reasons for not seeking orthodontic treatment that the student thought that treatment is fear of pain (48.8%) and not important or not possible (25.8%).6 - One or more missing teeth due to extraction or trauma were found in 4.9% of the sample, and the most common extracted teeth were the first molars (1.6% mandibular and 0.9% maxillary). One or more rotated teeth were found in 38.3% of the sample; one or more displacement teeth were found in 19.6% of the sample.7 - The maxillary anterior region showed the highest prevalence of 2mm or more spacing (15.2%) and the mandibular anterior region showed the highest prevalence of 2mm or more crowding (12.6%); a maxillary central diastema of 1mm or more was found in 18.1% of the sample with a mean of 0.306±0.015mm.8 - Angle’s class I occlusion was found in 78.29%of the sample, class II in 19.5% (17.2% division 1 and 2.3% division 2) and 2.3% had class malocclusion (1.6% postural and 0.7% true). The mean overjet of the sample was 3.31± 0.04 mm. The mean overbite was 2.99±0.03 mm,9 - Midline shift (?1mm) was found in 54.3% of the sample (28% to the right and 26.3% to the left side).Soft tissue impingement was found in 3.3% (3% palatally and 0.3% labially). Normal lip form was found in 86.6%, contracting lip form in 10.1% and lip trap in 3.3% of the sample.10 - The DAI scores registered in this study ranged between 13 and 65 with a mean of 23.234±0.12. 7.3% with treatment highly desirable, and 4.5% with treatment mandatory.Significant changes in the proportions of malocclusions as a whole in school children were found over the last decade; also increase the need for orthodontic treatment among adolescents in the Baghdad commune and low perception level of the Baghdadi children to their own occlusion and the demand on treatment was remarkably low. This data will be useful for public oral health service and emphasize the need for orthodontic treatment among adolescents in Baghdad and stressing on the role of oral health education to encourage the children to undergo orthodontic treatment.

تاثير اضافة فلوريد الصوديوم كمطهر على بعض خواص مادة طبعة الالجنيت == Effect of Sodium Fluoride Addition As A Disinfectant On Some Properties of Alginate Impression Material

Author name: علاء مهدي حسين

Supervisor name: رغداء كريم جاسم

General topic: Dentistry

Specific topic: Prosthodontics

Degree: Master

University: University of Baghdad

Language: English

University location: Baghdad

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Abstract: المقدمة : تلوث طبعات الاسنان مع اللعاب والدم من تجويف الفم يحصل مباشرة في عيادات الاسنان ومختبرات صناعة الاسنان يجعل من طبعات الاسنان الملوثة فقرات يصعب التعامل معها من وجهة نظر انتشار الاخماج. اشارت التقارير السابقة الى امكانية الطبعات الملوثة بتلويث ال | Introduction : Contamination of dental impressions with saliva and blood from the oral cavity occurs readily in dental clinics, direct interaction between dental clinics and dental laboratories makes contaminated dental impressions difficult items to deal with it from the cross contamination point of view. Previous reports indicated that contaminated impressions can cross infect gypsum casts that were poured against them, however immersing or spraying commonly used alginate impression material with disinfectant may adversely affect the accuracy of dies or casts obtained. Objective : The objective was to evaluate the effect of (0.25%,0.5%,1%, 2%, 3%, 4% ) of (NaF) addition on the self - disinfection of alginate impression material and its effect on setting time, tear strength, dimensional change and accuracy of alginate impression materials and to compare this with CHX containing alginate material related to the same properties mentioned above.Materials and methods : A total No. of 800 specimens were prepared in this study, they were divided into five main groups according to the type of the tests used (tear strength test, setting time test, dimensional change test, dimensional accuracy test, and bacteriological tests (Streptococcus mutans and Candida albicans).Six concentrations of NaF from (0.25% to 4%) and 0.1% CHX gluconate were mixed with alginate impression material and compare it with control alginate without disinfectant. Results : The self - disinfecting impression material containing NaF showed a total kill of microorganisms immediately after impressions were made.Tear energies for all experimental impression materials were greater than those of the control products. There were no statistically significant differences between the dimensional change tests and also reproduction of detail test, that contained (NaF) and one that did not. With regard to setting time of the impressions, statistically significant reduction were seen between the control and experimental groups of alginate impression materials. The experimental material that did not contain (NaF) had a considerably longer setting time than all of the other materials tested.Conclusion : the use of (NaF) and CHX disinfection when taking alginate dental impression is a good measure in reduction of contamination and cross infection and have a minute effect on dimensional stability and is recommended as step in protecting dentist and dental laboratories teams.

التاثير السمي للضوء الازرق المرئي على البكتيريا المشعشعة المصاحبة للورم الفطري والبورفيروموناس اللثوية في المرضى المصابين بالتهاب اللثة المزمن : دراسة مختبرية == Phototoxic Effect of Visible Blue Light On Aggregatibacter Actinomycetemcomitans And Porphyromonas Gingivalis In Patients With Chronic Periodontitis (An In - Vitro Study

Author name: علي رعد عبد العزيز

Supervisor name: مها شكري محمود | وفاق محمود الوتار

General topic: Dentistry

Specific topic: Around the Teeth Diseases

Degree: Master

University: University of Baghdad - Faculty Of Dentistry - Department Of Periodontics And Peridontics

Language: English

University location: Baghdad

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Abstract: الخلفية : على الرغم من ان ازالة الصفائح الجرثومية (الجير) وكلس الاسنان ( الحصى السنية ) بالطرق الميكانيكية يمثل حجر الزاوية في علاج امراض اللثة، يبقى ذلك بحاجة الى علاج مساند اذا علمنا ان التنظيف الميكانيكي لا يستطيع الوصول الى كل السطوح والاماكن حول السن | Background : Although mechanical debridement of dental plaque and calculus represents the corner stone in periodontal treatment , still it needs an adjunctive therapy since mechanical cleaning cannot reach all the surfaces and sites all around the tooth and within periodontal defect or the bacteria that resides inside periodontal tissues. Chemotherapy been used as an adjunctive therapy alongside with mechanical debridement in different compositions and routes, i.e. : chlorhexidine mouth washes (local routes) , antibiotics (systemic route) , yet chemical treatment might not be sufficient or cannot be used as in cases of drug sensitivity , difficulty to maintain effective concentration at wanted sites and lack of patient dexterity and compliance.Hence, arises the need for an alternative adjunctive therapy, photodynamic therapy has been used in recent years, taking advantage of the toxic effect of light on periodontal pathogens (bacteria). Aims of the study : The purpose of this study was to determine the toxic effect of visible blue light emitted from dental curing led light device of wavelength ranges between 400 - 500nm and energy of 1000 - 1200 mw/cm on the viability of periodontal pathogens (Aggregatibacter actinomycetemcomitans and Porphyromonas gingivalis), alone once , and with combination of 0.2% chlorhexidine mouthwash in vitro.Materials and methods : A.actinomycetemcomitans and P. gingivalis, was obtained from periodontal pockets of patient suffering from periodontitis by removing the plaque carefully to be cultured under anaerobic conditions for 3 days in suitable culture media using anaerobic jar in the incubator, presence of the wanted micro - organism is confirmed using Gram stain and biochemical activity tests.The amount (quantity of bacteria) was determined by direct colony counting and using visual software aids (open CFU software program) when needed.Visible blue light (LED curing light) from a commercially available device the same used in light - cured fillings in dentistry was used to generate a beam of visible blue light with amount of energy 1000 - 1200 mW/cm2 of a wavelength ranges between 400 - 500nm. Samples were subjected to blue light for increasing time intervals and were subcultured after each exposure.Same procedure of light exposure was repeated on plates containing chlorhexidine mouth wash in holes created with pasture tube, a standardized amount of chlorhexidine (0.1mml) was administrated into the holes of each plate, and then the inhibition zone was measured repeatedly for each plate after 72 hours of anaerobic incubation.

تسوس الاسنان والاحتياجات العلاجية لطالبات الثانوية لعمر (16 - 18) سنة وعلاقتهما مع نظافة الفم، المستوى الدراسي للاهل والتحليل الغذائي في مدينة المسيب/ محافظة بابل/ العراق == Dental Caries And Treatment Needs Among 16 - 18 Years Old High School Girls, In Relation To Oral Leanliness, Parent'S Education And Nutritional Status, In Al - Mussayb City/ Babylon Governorate/ Iraq

Author name: زهراء محمد حسین

Supervisor name: سلافة خالد السامرائي

General topic: Dentistry

Specific topic: Preventive Dentistry

Degree: Master

University: University of Baghdad

Language: English

University location: Baghdad

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Abstract: Background : Dental caries is a quite prevalent disease in Iraqi community however, baseline data concerning this disease and related etiological and risk factor are limited, concerning in selected geographic area in Iraq.Aims of study : This survey was made to investigate the prevalence and severity of dental caries in Al - Mussayb city/ Babylon governorate, the co - relation of this disease was studied with nutrition status and dietary analysis, oral cleanliness and parent'seducation among (16 - 18) years old in high school girls.Materials and Methods : The survey was conducted among high school girls, with a total sample of 900. Diagnosis and recording of dental caries and treatment needs were done according to the criteria of WHO. Dental plaque was assessed by using Plaque Index following the criteria of Silness and Loe. Nutritional status was recorded according to Body Mass Index indicator by applying anthropometric measurement. Dietary analysis was according to Dietary Guidelines in primary health centers in Iraq. Parent's education was divided in to five levels according to modification to educational status of Kuppuswamy's scale.Results : The prevalence of dental caries was (70.5%). The DMFS mean value was (4.94 ±SE 0.161) and the median was equal to (4.00) for the total sample. The DMFS value increased with ages with statistically highly significant difference (P<0.01), The highest percentage of examined girls were in need of one surface filling (60.8%), followed by those in need of two or more surface filling (36.6%). Result showed a weak positive highly significant correlation between plaque index and DMFS (r=0.315, P<0.01). A statistically highly significant difference in DMFS was recorded by different level of parent's education as a lower value of DMFS was seen among girls with high level of parent's education. Results showed statistically highly significant differences in the value of DMFS between different grade of Body Mass Index indicator (P <0.01, df=3), for total sample (11.7%) was malnourished and (65.77%) of girls was with normal weight. Statistically highly significant weak negative correlation was seen between DMFS and different food groups (fruits, vegetable, meat, grain and diary). A weak positive highly significant correlation between DMFS and sweet consumption was seen (r=0.155, P<0.01).Conclusions : Girls in high schools in Al - Mussayb city/ Babylon Governorate demonstrated a high prevalence of dental caries. Nutritional status, dietary habits, oral cleanliness and parent's education were found to affect the severity of this disease, thusthere is a need for public and school preventive programs among those population

ابعاد البلعوم فيما يتعلق ببعض المتغيرات السنية والقحفية للصنف الهيكلي الاول والثاني : دراسة مقارنة بالاشعة القياسية الجانبية عند البالغين == Nasopharyngeal Dimensions In Relation To Some Dento - Cranium Variables of Class I And II Skeletal Patterns (A Cephalometric Comparative Study In Adults)

Author name: عمار عباس فضل

Supervisor name: فخري عبد علي الفتلاوي

General topic: Dentistry

Specific topic: Orthodontics

Degree: Master

University: University of Baghdad - Faculty Of Dentistry - Orthodontics Department

Language: English

University location: Baghdad

First pages:

معدل انتشار وشدة نقص التمعدن الضرسي القاطعي والعلاقة مع العوامل المسببة بين اطفال المدارس بعمر 7 - 9 سنة في محافظة النجف == Prevalence And Severity of Molar - Incisor Hypomineralisation In Relation To Its Etiological Factors Among School Children Age 7 - 9 Years In Al - Najaf Governorate

Author name: ولاء عامر عوفي

Supervisor name: بان علي صالح

General topic: Dentistry

Specific topic: Pediatric Dentistry

Degree: Master

University: University of Baghdad

Language: English

University location: Baghdad

First pages:

Abstract: Molar - Incisor hypomineralisation (MIH) is one of the biggest challenges with great clinical interest for dental practice because MIH has a great impact on the oral health as consequently, on the quality of life of children. Currently, the etiology of MIH remains unclear and is thought to be acquired via multifactorial, systemic disturbances during amelogenesis. There is no previous study concerning school children aged 7 - 9 years in Al - Najaf govemorate in order to estimate the prevalence and severity of molar incisorhypomineralisation and the possible associated risk factors. Objective : To estimate the prevalence , severity and the possible associated etiological factors of molar - incisor hypomineralisation and also to study the correlation between body mass index and molar - incisor hypomineralisation.Patients and Methods : A cross sectional study was conducted at Al - Najaf Govemorate, data were collected during the period from January to the end of April 2014. study population included the primary school children aged, 7 - 9 years of both genders who attending the primary schools of Al - Najaf govemorate. Children having amelogenesis imperfecta, tetracycline staining or undergoing orthodontic treatment at the time of study, those with completely broken crowns of the first permanent molars, or those whose parent/guardians refusedto missed data or not get back the questionnaire were excluded from the study. Sample size was calculated according to the standard equation and a total of 600 children were enrolled. A structured self - administered validated arabic language questionnaire and an examination sheet was measured. Body weight and height were measured and the body mass index was calculated according to the standards. Dental material and supplies were used in examination, Prior to the clinical examination the participating children were given a toothbrush and fluoridated toothpaste to brush their teeth thoroughly under the supervision of the researcher. The demarcated hypomineralization was recorded according to the 10 point scoring system depended on the European academy of pediatric dentistry evaluation criteria. The severity was assessed according to the clinical evaluation of the examiner and the presence of opacities. Data of the studied group were entered and analysed by using the statistical package for social sciences (SPSS) version 21 and appropriate statistical tests were used to assess the differences and correlations between variables. Results : The response rate was 84. 7% and the highest was in the 9 - year - old children, the participants were 532 children, the prevalence of hypomineralisation defect was 22.9%. The prevalence of demarcated hypomineralisation was increased concomitantly with the age, and the 9 - yearold children were the more affected. The overall prevalence of molar - incisor hypomineralisation among boys was lower than girls; (17.3%) and 22.6%, respectively. Molar - incisor hypomineralisation was more frequent in normal body mass index children. The total number of teeth of the studied group was 1464. The number of affected teeth was 3 81 represented (26%) of the total number of teeth. The molar and incisors were most affected with White/creamy demarcated opacities with no posr eruptive enamel breakdown, (27.7% and 15.2%), respectively. The severely affected teeth were 33 teeth, represented 4.5% of the total number of teeth of the 122 children , severely affected molars were 25 (5.1 %) and the severely affected incisors were 8 (0.8%), (P=0.001), Obeseand overweight were more likely to have more severely affected teeth and the severity was also increased with the age of child. Conclusions and Suggestions : The prevalence of Molar Incisor Hypomineralisation among Iraqi schoolchildren of Al Najaf govemorate was 22.9%, it was more prevalent among girls, the 9 - year - old children , normal body weight children and urban residents. Molars were more affected with than incisors. It was more prevalent in maxillary than mandibular teeth. The severely affected teeth represented 4.5% of the total number of teeth of the 122 children. , molars were more severely affected than incisors. The more severely affected teeth reported inobese and underweight children. Further studies are suggested for further understanding of the etiological and risk factors of the disease.

Author name: محمد كاظم جواد

Supervisor name: عباس فاضل علي

General topic: Dentistry

Specific topic: Oral Histology

Degree: Master

University: University of Baghdad

Language: English

University location: Baghdad

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Abstract: The objectives of this study was to evaluate the effect of addition of Multi - Wall Carbon Nano ubes(MWCNTs) of different concentration (0.05 mg/mL - 1, 0.25 mg/mL - 1, 0.5 mg/mL - 1and 1 mg/mL - 1) with on either (dimethyl sulphoxide DMSO and distilled water DW) on tooth enamel. It is intended to evaluate enamel microhardness in (Kg.m - 2) and enamel thermal conductivity before and after the application of (MWCNTs).Ninety mandubular first premolar were prepared for this study. They were divided into two groups. The first group contains 54 sample to measure the microhardness of the enamel. To overcome the teeth curvature in microhardness measurement, the position of indenter were optimized to coincide linear buccal surface. The second group contains 36 sample to measure the thermal conductivity of the enamel were prepared by cutting enamel part in triangle form with a base of 7. 5 mm , height of 9. 5 mm and thickness of 2 mm according to the requirements of the Fourier’s law by abrasive disk.The results enamel microhardness showed that a significant increase in the enamel microhardness and enamel thermal conductivity for groups 0.05 mg/mL (group B) , 0.25 mg/mL (group C ) , 0.5 mg/mL (group D ) and 1 mg/mL (group E ) compared with control group (group A ) in DW media and DMSO media. The results showed a significant increase in the enamel microhardness and enamel thermal conductivity for polished samples compared with unpolished samples in DW media and DMSO media. DMSO media increases the enamel microhardness and enamel thermal conductivity more effectively than DW media. Scanning electron microscope showed a significant deposition of MWCNTs in the depth of the enamel exceeding the surface layer. The polished specimens had more deposited MWCNTs compared with non - polished specimens. However, the nano dimensions with conjunction with pre - chemical treatment enabled the MWCNTs to penetrate and settle down inside the enamel.The final conclusion highest mean value obtained was 1 mg/mL (group E ) in the enamel microhardness and enamel thermal conductivity suspension in DW media and DMSO media.