نتایج جستجو برای: acid strength

تعداد نتایج: 942704  

Journal: :iranian journal of public health 0
e yassini m hedayati

self etching primers, due to ease of manipulation, have been extensively used in recent years. these self etching primers containing a relatively weak acid, may not provide an optimal bond strength. the purpose of the present in-vitro investigation was to evaluate the effects of 37% phosphoric acid application prior to applying self etching primers on composite bond strength. in this experiment...

Journal: :journal of dental research, dental clinics, dental prospects 0
abdolrahim davari mostafa sadeghi hamid bakhshi

background and aims. er:yag laser irradiation has been claimed to improve the adhesive properties of dentin; therefore, it has been proposed as an alternative to acid etching. the aim of this in vitro study was to investigate the shear bond strength of an etch-and-rinse adhesive system to dentin surfaces following er:yag laser and/or phosphoric acid etching. materials and methods. the roots of ...

Journal: :journal of dentistry, tehran university of medical sciences 0
m. hasani tabatabaei y. alizade s. taalim

statement of problem: in some clinical situations, repair of composite restorations is treatment of choice. improving the bond strength between one new and old composite usually requires increased surface roughness to promote mechanical interlocking since chemical bonding might not be adequate. similarly, the treatment of a laboratory fabricated resin composite restoration involves the same pro...

Journal: :physical chemistry research 2015
mohammad izadyar mohammad reza housaindokht neda zavvar mohammad khavani adel reisi-vanani

in this study, the effect of the secondary structure of the protein on the acid strength of three structures of random (r), alpha helix (α) and beta sheet (b) were investigated theoretically. these structures are related to the cationic amino acids of histidine and lysine in the polypeptide chain of eight-glycine residue. computational methods at the hf, b3lyp, x3lyp and m05-2x levels in the ga...

A Kaviani, H Alinejad, N Gharizadeh, R Moosavi,

  Objective: Repair of an indirect restoration is usually preferred over its replacement. This study aimed to evaluate the effect of silane in different surface preparation techniques on the bond strength of direct to indirect composite resin.   Methods: For this in vitro experimental study, 48 indirect composite cubes were fabricated, divided into 4 groups of 12 and subjected to the following ...

Journal: :journal of physical & theoretical chemistry 2004
farrokh gharib karim zare ramin cheraghali

the dependence on ionic strength of protonation of l-aspartic acid and its complexation withdioxouranium(vi) is reported in sodium perchlorate solution as a background salt. the measurementshave been performed at 25 ± 0.1 °c and various ionic strengths in the range 0.1 to 1.0 mol dm-3, using acombination of potentiometric and spectrophotometric techniques. the overall analysis of the present an...

Journal: :dental research journal 0
m. khoroushi b. karimi

introduction in this study, we have investigated the effect of using phosphoric acid on bonding efficacy of an all-in-one adhesive system, after salivary contamination of dentin. methods and materials eighty-four extracted human molars were prepared for their superficial dentins to be exposed. the molars separated into 7 groups. group 1 specimens were not contaminated. in groups 2-4, samples we...

Journal: :journal of dentistry, tehran university of medical sciences 0
m omid khoda assistant professor, dental research center of mashhad university of medical sciences, department of orthodontics, school of dentistry, mashhad, iran. f heravi h shafaee h mollahassani

it is proved that acidic soft drinks that are commonly used, have an adverse effect on dental structures, and may deteriorate oral heath of our patients and orthodontic appliances. the aim of this study was to compare the effect of yoghurt drink with other soft drinks on the shear bond strength of orthodontic brackets.seventy-five first premolar teeth extracted for orthodontic purposes were sel...

Journal: :journal of dental school, shahid beheshti university of medical sciences 0
آزیتا کاویانی a kaviani dental school, jondi shapour university of medical sciences, ahvaz-iran.دانشکده دندانپزشکی، دانشگاه علوم پزشکی اهواز نغمه قاری زاده n gharizadeh dental school, jondi shapour university of medical sciences, ahvaz-iran.دانشکده دندانپزشکی، دانشگاه علوم پزشکی اهواز هنگامه علی نژاد h alinejad dental school, jondi shapour university of medical sciences, ahvaz-iran.دانشکده دندانپزشکی، دانشگاه علوم پزشکی اهواز ریحانه موسوی r moosavi

objective: repair of an indirect restoration is usually preferred over its replacement. this study aimed to evaluate the effect of silane in different surface preparation techniques on the bond strength of direct to indirect composite resin.   methods: for this in vitro experimental study, 48 indirect composite cubes were fabricated, divided into 4 groups of 12 and subjected to the following pr...

Ali Heidari, Ali Nozari, Azade Rafiee,

Introdouction: Esthetic demands of patients have led to the introduction of tooth-colored restorations wherecomposite resins are bonded to the enamel using acid etch techniques. Total etch adhesion systems are still considered as the gold standard among bonding systems. However, clinicians have a tendency to use adhesive systems with simpler application procedures. The aim of the present stu...

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