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Article
The Effect of Different Disinfectant Solutions on Shear Bond Strength of Acrylic Teeth to Flexible Denture Base Material

Author: Ihssan F Al-Takai
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2014 Volume: 14 Issue: 24 Pages: 145-152
Publisher: Mosul University جامعة الموصل

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Abstract

is to evaluate the effect of three different disinfectant solutions on shear bond strength of artificial acrylic teeth for retention to flexible denture base material at three different periods of time. Materials and Methods: The total number of samples was (60) divided into 4 groups according to the three chemical disinfectant solution which used and the control distilled water group: Group( I) vinegar group, Group( II) salt group , Group(III) Chlorohexidine group , Group (IV ) the control distilled water group, where each group was subdivided into three subgroups according to disinfection periods which are 1week, 1month and 3month where each group contain five samples. The samples of shear bond strength test were consist of acrylic teeth with T-shape design for retention attached to rod of valplast The test was performed using a Universal testing machine. ANOVA, DuncunP,Ps multiple range and Post Hoc Tests were carried out to determine the significant difference at p ≤ 0.01%. Results: The results appeared that control distilled water group has the highest value for the three periods of disinfection (1 week,1month,3months), while vinegar solution group has the least value. The results showed that there were significant differences between the four tested groups and also there were significant differences among all periods of time of disinfections. Conclusion: There was a significant difference of shear bond strength between artificial teeth and flexible denture base material after disinfection in the four disinfectant solutions for all periods of time of immersion. Vinegar group had highest effect on the bond strength while the distilled water group had the least effect after all periods of time of disinfections. Shear bond strength decreased with increasing the time immersion. The shear bond strength was lowest in chloherxidine group as the time of immersion increase when compared with the two other groups of disinfection solutions in this study.


Article
Comparing the Effects of Denture Base Materials on Hygiene of Mucosal Denture Bearing Area

Authors: Ghada M. Mustafa --- Mohammed A. Abed AlBaki --- Sahar A. Naji
Journal: Tikrit Journal for Dental Sciences مجلة تكريت لعلوم طب الاسنان ISSN: 20731213 Year: 2014 Volume: 3 Issue: 1 Pages: 71-76
Publisher: Tikrit University جامعة تكريت

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Abstract

This study attempted to evaluate the effects of using partial denture on the oral mucous membrane of the denture bearing area between 48 patients attended the private clinic seeking RPD treatment , two types of denture material were used (Hard or heat cured acrylic partial denture and flexible(Nylon) partial denture) .Flexible dentures exhibited viscoelastic behaviour that lead to improvement in masticatory function and patients comfort compared with hard dentures .Flexible dentures showed little effects on the mucosa of denture bearing area and little changes on the mucosa, but there were high influences on the soft tissues properties with using hard acrylic denture type . Denture hygiene found mainly fair in both hard and flexible(nylon) denture base materials.


Article
Adherence of Candida albicans to Flexi-ble Denture Base Material

Authors: Zeina M Ahmad --- Eman A Mustafa --- Inas A Jawad
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2012 Volume: 12 Issue: 20 Pages: 229-235
Publisher: Mosul University جامعة الموصل

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Abstract

Assessment of Candida albicans adherence to flexible denture base material (Valplast) and con-ventional heat polymerized acrylic resin in the presence and absence of saliva. Materials and Me-thods: A total of 28 square specimens (10 mm x10 mm x3mm) were constructed from Valplast and acrylic denture base materials according to manufacturers' instructions and kept without finishing or polishing. C. albicans was isolated from patients with denture stomatitis. Fourteen specimens (7 of each material) were not coated with human saliva (control), deposited in yeast suspension (107 ) yeast cells/ml, incubated for 1hr at room temperature and washed with phosphate buffer saline and then stained with crystal violet. The remaining 14 specimens (7 of each material) were coated with saliva and treated as previously described. Adherent yeast cells in 84 fields of view (0.25mm2/field) of mate-rials were enumerated. The results were expressed as yeast cells/mm2 of material. Results: In compari-son between the two denture base materials, Candida adherence to acrylic resin (170 yeast cells/mm2) is greater than Valplast (126 yeast cells/mm2). Both saliva uncoated and coated acrylic samples have higher means of Candida adherence (208, 132 cells/mm2) than saliva uncoated and coated Valplast samples (175, 77 cells/mm2) respectively. High significant reduction in yeast counts was seen in both materials after saliva coating. Conclusions: Great reductions in yeast counts were determined in Val-plast material specially in saliva coated specimens when compared with acrylic resin.


Article
Influence of Coca-cola on Surface Roughness and Microhardness of Flexible Denture Base Material

Author: Noora Musadaq نورا مصدق قاسم
Journal: Tikrit Journal for Dental Sciences مجلة تكريت لعلوم طب الاسنان ISSN: 20731213 Year: 2018 Volume: 6 Issue: 1 Pages: 19-27
Publisher: Tikrit University جامعة تكريت

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Abstract

Two potential problems commonly associated with flexible denture base material are surface roughness and the reduction of microhardness due to many reasons, rough surface can cause bacterial collection and the patient feels discomfort, and the possibility of the denture scratched when the surface hardness is reduced. The aim of this study was to evaluate the influence of Coca-cola on the surface quality of the flexible denture base material represented by the surface roughness and microhardness. A total of (10) samples were prepared for this study with the dimension of ( 40mm, 10mm, 3mm) length, width, and height respectively from thermo-plastic flexible resin (X-flexible capsules, color; K2 , size; LChina) by the conventional methods following the manufacturer instructions. The samples were immersed in Coca-cola drink for 12 days at room temperature. This period represents the average of one year of the beverage consumption, the drink has been changing daily.The samples were marked randomly and kept in special containers, and each sample has two rectangular surfaces used for the tests. One side is used for microhardness test and the other side used for the surface roughness test. The first tests were done before immersing the samples in coca-cola as control group. And after immersing the second tests were done as experimental group. In this study the data was analyzed using Independent samples (T- test). And results showed that there is no statistically significant difference in the surface roughness of the samples before and after immersing in Coca-cola (P-value > 0,05), while the microhardness test showed statistically a significant difference (P-value < 0,05) before and after immersing in Coca-cola. The surface roughness of flexible thermoplastic resin is not affected by coca-cola drink. While the levels of mirohardness showed decreasing after immersion in coca-cola drink. Therefore, the flexible thermoplastic material could be damaged if it is subjected to extra consumption of Coca-cola drink by the patient and this leads to lessen the amount of hardness by the time that could affect the efficiency of the prostheses, also could affect the mechanical

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