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Register a new userThe Effect of Light Activation of Hydrogen Peroxide (of High Concentration) on Enamel Microhardness
تأثير التنشيط الضوئي لمادة بيروكسيد الهيدروجين ذات التركيز المرتفع في قساوة الميناء السنية
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نظراً إلى انتشار تصبغات الأسنان الخارجية و الداخلية، فقد شاع التبييض الفعال في العيادات السنية مع التنشيط الضوئي أو من دونه دون الاهتمام بما قد يلحق بالميناء السنية من ضرر. الهدف من هذه الدراسة المخبرية هو دراسة قساوة الميناء المجهرية بعد تطبيق مادة بيروكسيد الهيدروجين ذات التركيز 38 % مع تنشيطها ضوئياً أو من دونه باستخدام اختبار Vickers.
since teeth whitening is very important procedure in dental office. the effect of peroxides on enamel tissue is of great interest in research. The aim of this in vitro study was to perform a qualitative analysis of the human enamel microhardness after the application of high concentration of hydrogen peroxide (38%)with and without light activation, using Vickers microhardness tests.
Artificial intelligence review:
Research summary
تبحث هذه الدراسة في تأثير استخدام بيروكسيد الهيدروجين بتركيز 38% على قساوة الميناء السنية عند تفعيله ضوئيًا أو بدون تفعيل ضوئي. تم استخدام 15 تاجًا لرحى ثالثة علوية بشرية سليمة، وقسمت إلى 45 قطعة سنية وزعت على ثلاث مجموعات: مجموعة شاهدة، مجموعة تبييض بدون تفعيل ضوئي، ومجموعة تبييض مع تفعيل ضوئي. بعد حفظ القطع في اللعاب الصناعي لمدة 7 أيام، تم قياس قساوة الميناء باستخدام اختبار Vickers. أظهرت النتائج أن قساوة الميناء نقصت بشكل ملحوظ في المجموعة التي تعرضت للتبييض فقط، وزادت النسبة بشكل أكبر في المجموعة التي تعرضت للتبييض مع التفعيل الضوئي. خلصت الدراسة إلى أن استخدام بيروكسيد الهيدروجين بتركيز عالٍ يؤثر سلبًا على قساوة الميناء، وأن التفعيل الضوئي يزيد من هذا التأثير السلبي.
Critical review
دراسة نقدية: تعتبر هذه الدراسة مهمة لأنها تسلط الضوء على تأثيرات جانبية محتملة لاستخدام مواد تبييض الأسنان بتركيزات عالية، خاصة مع التفعيل الضوئي. ومع ذلك، يمكن توسيع نطاق البحث ليشمل عينات أكبر ومتابعة طويلة الأمد لتقييم تأثيرات التبييض على المدى البعيد. كما يمكن دراسة تأثيرات مواد تبييض أخرى بتركيزات مختلفة ومقارنتها بنتائج هذه الدراسة. من الجيد أيضًا تضمين دراسات حول تأثير الفلوريد ونترات البوتاسيوم في تقليل الأضرار الناتجة عن التبييض.
Questions related to the research
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ما هو الهدف الرئيسي من هذه الدراسة؟
الهدف الرئيسي هو دراسة تأثير بيروكسيد الهيدروجين بتركيز 38% على قساوة الميناء السنية عند تفعيله ضوئيًا أو بدون تفعيل ضوئي.
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ما هي الطريقة المستخدمة لقياس قساوة الميناء في هذه الدراسة؟
تم استخدام اختبار Vickers لقياس قساوة الميناء.
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ما هي النتائج الرئيسية التي توصلت إليها الدراسة؟
أظهرت النتائج أن قساوة الميناء نقصت بشكل ملحوظ في المجموعة التي تعرضت للتبييض فقط، وزادت النسبة بشكل أكبر في المجموعة التي تعرضت للتبييض مع التفعيل الضوئي.
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ما هي التوصيات التي قدمتها الدراسة بناءً على النتائج؟
توصي الدراسة بترشيد استخدام التراكيز العالية لمواد تبييض الأسنان وحصر استخدام أجهزة التنشيط الضوئي للحالات الخاصة.
References used
Fasanaro TS. Bleaching teeth: history, chemicals and methods used for common tooth discolorations. J Esthet Dent 1992 ;4(3): 71-78
Greenwall L. Bleaching technique in restorative dentistry . 2001 ; 24-48
Scoop W, Kazandjan G. Tetracyclin induced staining of teeth . postgraduate Medicine 1986;79
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Alterations of the enamel after topical application of bleaching
agents, presenting as major consequences are: ions release,
increased superficial roughness, stronger bacterial attachment
and hardness alteration.The aims of the study were to evalu
ate
the effect of the bleaching agent (35%hydrogen peroxide) for
vital teeth by using light source on the release of ions from the
enamel surface. our sample consisted of 30 sound enamel
surface for control group,30 sound enamel surface
for(35%hydrogen peroxide), and then application of light
radiation to activate the bleaching agent. Ion Chromatography
were used to measure the ions release .
In this research, the electrochemical reduction of hydrogen process
and the factors affecting the reduction potential have been studied
in this research. The effect of acid concentration on the shifting of
the volt-ampero-metric curves that expres
s the reduction process
and so its effect on both the reduction potential value of hydronium
ions on drop mercury electrode, and the speed value of reduction
reaction was studied. Then an amount of pyridine as organic
substance was added to a specific volume of acid in a specific
concentration to figure out the relationship between the amount of
pyridine added and the cathode current of the reaction to find out
the effect of added pyridine on the reaction speed and the
relationship between the amount of added pyridine and the
hydrogen reduction potential.
Pyridine was added to amount of acid to study the effect of
theaddition on the hydrogen reduction over potential.
The research project sample consisted of 80 extracted central incisors obtained from the Oral and Maxillofacial Surgery Department as well as from private practices. These teeth were divided into two equal groups. The bonding agent ClearFil SE Bond w
as used in one group, whereas the OptiBond Solo Plus bonding agent was used in the other group. Each group was divided into four subgroups: (1) veneers performed without any bleaching, (2) veneers performed two weeks before bleaching, (3) veneers performed immediately following bleaching and (4) veneers performed two weeks after bleaching.
veneers were made using a special template which allowed producing the same size of all the specimens used in this project. These veneers were placed on the vestibular surfaces of enamel of the extracted central incisors.
The aim of the previous procedures was to study the effect of home teeth bleaching .
Teeth were embedded in acrylic blocks created in metallic cylinders. The bonding strength was measured through .
The results showed that there was a significant difference between the control subgroup and the second subgroup .
Solar Energy and Hydrogen are possible replacement options for fossil fuel, But a major drawback to the full implementation of solar energy, in particular photovoltaic (PV), is the lowering of conversion efficiency of PV cells due to elevated cell t
emperatures while in operation. Also, hydrogen must be produced in gaseous or liquid form before it can be used as fuel; but its‟ present major conversion process produces an abundance of carbon dioxide which is harming the environment through global warming. In search of resolutions to these issues, this research investigated the application of Thermal Management to Photovoltaic (PV) modules in an attempt to reverse the effects of elevated cell temperature. The investigation also examined the effects of the thermally managed PV module to a Electrolyzer (Hydrogen Generator) for the production of hydrogen gas in an environmentally friendly way.
The results of the investigation showed that the cooling system stopped the cell temperature from rising, reversed the negative effects on conversion efficiency, and increased the power output of the module by as much as 33%. The results also showed that the thermally managed PV module when coupled to the hydrogen generator impacted positively with an appreciablely increase of up to 26% in hydrogen gas production.
Hydrogen production, vector of energy, by water electrolysis can be economically
viable by using electrical energy from renewable sources such as photovoltaic solar
energy. In this research was the study of solar hydrogen production using electroly
ser
based on polymeric exchange membrane electrolysis technology manufactured locally at
the Faculty of Technical Engineering in Tartous. The experimental studies were achieved
in two different methods: the first, direct coupling to the hydrogen electrolyser with PV
module. The second method, designed PV-electrolyzer system consists of the following
components: PV module, a maximum power point tracker (MPPT), A DC-DC converter,
which is used to operate the system at the maximum power of the PV system at all times
and to supply the necessary DC current to the electrolyzer, and tank hydrogen. The results
showed that the second method more effective and highly efficient when compared with
the first method because of the change in the intensity of solar radiation during the day.
Also, results show that some additives such as (KOH) play an important role in enhancing
the ionization process of the electrolyte liquid and improve process flow.
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