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Effect of different denture cleanser solutions on some mechanical and physical properties of nylon and acrylic denture base materials

Authors: Mohamad Salman مهند سلمان --- Shatha Saleem شذى سليم
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2011 Volume: 23 Issue: special issue Pages: 19-24
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Thermoplastic non –metal clasp denture became recently the most attractive option for patients dueto its esthetic outcome and many other advantages. The chemical immersed denture cleanser is the most widelyused method by the patients to maintain clean and healthy denture , but the use of such cleanser may haveharmful effect on the denture base materials .This study aimed to evaluate some physical and mechanicalproperties of one of the thermoplastic denture base materials which is (nylon) compared with those belong toconventional heat cured acrylic and to observe the effect of two prepared denture cleansers ( 4% oxalic acid ,4%tartaric acid ) in addition to one commercial denture cleanser (lacalut dent) on the indentation hardness , flexuralstrength , flexibility , surface roughness and color stability of nylon and conventional heat cured acrylic.Materials and method: Two hundred and sixty specimens (130 nylon and 130 acrylic) were prepared ,60 specimens(30 nylon ,30 acrylic ) were used to test each of the properties mentioned above except an 80 specimens were used(40 nylon ,40 acrylic ) to test flexural strength and flexibility.Results: The result obtained in the present study showed high significant difference between nylon and conventionalheat cured acrylic in four properties which were: indentation hardness , flexural strength , flexibility and color stability,with no difference in the surface roughness .Furthermore oxalic acid and tartaric acid cleansers significantlydecrease the indentation hardness and flexural strength of conventional heat cured acrylic while lacalut dent didn’tsignificantly affect those properties of acrylic, also all the three cleansers didn’t affect the indentation hardness andflexural strength of nylon .oxalic acid and tartaric acid cleansers significantly decreased the flexibility of nylon whilelacalut dent didn’t significantly changed this property. All the three cleanser had no effect on the flexibility ofacrylic. All the three cleanser had no effect on the surface roughness or color stability of nylon and acrylic.Conclusions: It can be concluded that nylon had better flexibility and translucency than conventional heat curedacrylic while conventional heat cured acrylic had better indentation hardness and flexural strength than nylon.Regarding surface roughness the two polymers show no significant difference between them.There were an adverse effect of the prepared denture cleansers which contain isopropyl alcohol on indentationhardness and flexural strength of conventional heat cured acrylic , it decreased both those properties , so it isadvised not to use solution containing alcohol as acrylic denture cleanser also it is advised not to use it withnylon denture because it decreased its flexibility. Lacalut dent which is an oxygenating commercial denturecleanser, had no adverse effects on both polymers used in the study, so it can be used safely with them


Article
Evaluation of corrosion behavior of bioceramics coated commercially pure titanium and Ti-6Al-4V alloy

Authors: Hanan Ali حنان علي --- Shatha Saleem شذى سليم --- Thair L. Al-Zubaydi ثائر الزبيدي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2014 Volume: 26 Issue: 3 Pages: 41-48
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: This study report the corrosion behavior of commercially pure titanium and Ti-6Al-4V alloy sampleswithout coating and with hydroxyapatite, partial stabilized zirconia and mixture of partial stabilized zirconia andhydroxyapatite coating and comparison between them through electrochemical polarization tests in 37 0 C Hank'ssolution.Materials and methods: Electrophoretic deposition technique (EPD) was used to achieve the coating from each oneof three types of the coating materials (HAP, PSZ and mixture of 50% HAP and 50%PSZ) on Cp Ti and Ti-6Al-4V alloysamples. The electrochemical corrosion test was performed when samples were exposed to Hank's solution preparedin the laboratory and the polarization potential, corrosion rate and the open circuit potential of the samples weremeasured.Results: The results indicated that the corrosion rate is significantly higher for Ti-6Al-4V than for Cp Ti .The three types ofcoating significantly reduced the corrosion rate for Cp Ti while did not for Ti-6Al-4V alloy .After coating the corrosionrate for Ti-6Al-4V remained significantly higher than the coated Cp Ti samples .The open circuit potential (OCP) forboth Cp Ti and Ti-6Al-4V samples was in the following sequence PSZ > HAP> mixture of HAP and PSZ >uncoated.Conclusions: Cp Ti showed less corrosion rate than Ti-6Al-4V alloy with and without coating .Coating significantlydecreased the corrosion rate of Cp Ti but did not for Ti-6Al-4V alloy

المقدمة: ان تحقق نجاح عملیة زراعة الاسنان سریریا لیس بسبب المتانة المیكانیكیة او الانسجام الحیوي المتمیز لمادة الزراعة وحسب بل بسبب صفات اخرى لمادة الزراعة مثلخواصالسطح وسلوك التاكل.المواد وطریقة العمل: استعمل الترسیب بالھجرة الكھربائیة للحصول على طلاء متجانس لواحد من ثلاثة انوع من طبقات الطلاء (الھایدروكسي ابیتایت ,الزركونیا المثبتة جزئیا وخلیط.(Ti-6Al-4V ) الھایدروكسي ابیتایتاوالزركونیا المثبتة جزئیا)على النماذج المكونة من التیتانیوم النقي وسبیكةاما بالنسبة لاختبارات التاكل الكھروكیمیاوي فقد تم قیاسھا للنماذج في محلول الجسم المماثل المحضر مختبریا وایضا قیاس جھد الاستقطاب ومعدل التاكل وجھد الدائرة المفتوحةعند مقارنتھا مع التیتانیوم النقي .ولقد لوحظ ان معدل التاكل قل بشكل واضح لنماذج التیتانیوم النقي Ti-6Al-4V النتائج: تشیر نتائج ھذة الدراسة الى ان ھناك معدل تاكل عالي لسبیكةبعد الطلاء أعلى من التیتانیوم النقي . Ti-6Al-4V وایضا بقي معدل التاكل لسبیكة .Ti-6Al-4V المطلیة بالطلائات الثلاث بینما ذالك لم یظھر لسبیكةTi-6Al- ثر على سلوك سبیكة θ قبل الطلاء وبعد الطلاء .الطلاء قلل معدل التاكل للتیتانیوم النقي بینما ذالك لم ی Ti-6Al-4V الاستنتاجات: معدل التاكل للتیتانیوم النقي اقل من سبیكة.4V

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