جستجوی مقالات مرتبط با کلیدواژه "آمالگام دندانی" در نشریات گروه "پزشکی"

Pain and sensitivity to thermal irritation after amalgam restoration is one of the most common problems, causes frequent recurrence of these patients to dental clinics. Since low-level laser has several benefits in reducing inflammation, pain and sensitivity, the aim of this study was to evaluate the effect of low-level Ga-Al-As laser on the treatment of dentinal sensitivity after amalgam restoration.

In this double-blind clinical trial study, 21 patients with short-term sensitivity to thermal irritation after amalgam restoration (from the time of repair to two months) were evaluated. The case group was treated with Ga-Al-As laser in 4 sessions with intervals of three days. For the control group, the similar condition was applied except that the device was off. The sensitivity was assessed based on VAS criteria prior to treatment, immediately after treatment, and 3 and 6 months after treatment.

Pre and post-treatment pain in case group was 7.3±1.16, 4.5±3.03 and in control group was 6.45±1.75, 4.27±3.04 respectively. The reduction in pain immediately after treatment was significant only in the case group (p= 0.004). In the follow-up period of 3 and 6 months, the mean VAS in the case group was significantly higher than that in the control group (p= 0.026 and p= 0.020, respectively).

Based on the results this study, the Ga-Al-As low-level laser has a decreasing effect on the sensitivity of post-amalgam restorations in a short term.

Dental amalgam is considered as the most tolerable restorative dental material due to its proper physical and mechanical properties, cost-effectiveness, and long term clinical performance. In this study, the physical and mechanical properties of nine relevant amalgams in Iranian dental material market were investigated based on ISO 24234: 2015. Moreover, the morphological characterization of dental amalgam alloy was evaluated using field emission scanning electron microscopy (FE-SEM). An amalgamator was utilized to mix the amalgam alloy powder with mercury. In addition, the investigation of the microstructure of dental amalgam was conducted using FE-SEM equipped with an Energy Dispersive Spectroscopy system to analyze the composition of the elements. The required samples for the evaluation of compressive strength, creep, and dimensional changes during hardening were prepared using the recommended standard template based on the suggested program. The data were analyzed using one-way ANOVA and Tukey's test. P-value less than 0.05 was considered statistically significant. The evaluation of morphological characteristics of amalgams showed that amalgams, namely “GK-110” and “110 Plus” were prepared from lath cut particles. In addition, amalgams, such as “Cinasilver”, “Solaloy”, and “World Work” were composed of spheroid-like particles. However, alloys, including ANA 2000, Contour, SDI GS-80, and Cinalux showed mixed morphologies of spherical (or spheroid-like) and lath cut particles. Regarding the mixed alloys, “Contour Regular Kerr” and “SDI GS-80 Regular Set” contained more spherical particles. However, higher levels of lath cut particles were observed in “ANA 2000” and “Cinalux”. The homogenous and fine-grained microstructures were observed in spherical and spheroid-like particles. All studied dental amalgams comply with the requirements for creep according to the standard ISO 24234: 2015. The results of one-way ANOVA revealed that one-hour compressive strength of Cinasilver amalgam was significantly higher than that of the other amalgams (P<0.05). According to Tukey Post Hoc analysis, there was no significant difference regarding one-hour compressive strength in Contour, Cinalux, and Cinasilver (P>0.05). Out of all studied amalgams, SDI gs-80 showed the lowest coefficient of variation regarding compressive strength. In terms of the number of specimens with higher strength more than the minimum strength requirement of the standard, Cinasilver amalgam completely met the standard requirements for one hour and one day. Except for 110 Plus amalgam, the other amalgams met the requirement regarding the dimensional changes during the hardening within the specified standard range. The results indicated that amalgam “Cinasilver” met the standard requirements of ISO 24234: 2015regarding creep, dimensional changes, and compressive strength in one hour and a day.  However, amalgams, namely Cinalux, Contour, and SDI gs-80 may be considered as appropriate amalgams.

Today, the high silver amalgam has been mentioned because of its appropriate properties so purpose of this study was the evaluation of bond strength of composite to high silver amalgam by using different bonding agents.
Methods and materials: In this experimental study, 52 acrylic cylinders were made and amalgam which contains of 60%Ag were condensed into this cylinders, amalgam surfaces were roughened by diamond bur and all samples were immerged in ultrasonic bath. Then specimens divided into 4 groups of 13 samples: group (1) Amalgam Alloy primer single bond, group (2) Amalgam Alloy primer G.bond, group (3) Amalgam single bond .bond, group (4) Amalgam G.bond. Resin composite was bonded to prepared amalgam specimens by using translucent polyethylene mold and cured by LED Turbo and tested by universal testing machine for shear bond strength and finally data were analyzed with one-way analysis of variance and LSD test.
In this study, the greatest values of bond strength were related to bonded specimens of use of Alloy primer G.bond bonding agent and lowest values were related to bonded specimens use of single bond bonding agent and mean shear bond strength in 4 groups had statistically significant difference (P=0.002).
Combination of alloy primer and G.bond. bonding agent increased the bond strength between composite and high silver amalgam significantly

Assure universal bonding resin is marketed with fluoride releasing potential. The manufacturer claims that it provides adequate bond strength between the bracket and amalgam and porcelain. This study compared the shear bond strength of Transbond XT and Assure universal bonding resin to stainless steel brackets, amalgam and porcelain in vitro. In this in vitro study, 20 standard brackets of the maxillary central incisors, 20 feldspathic porcelain specimens and 20 self-cure acrylic cavities filled with amalgam were divided into 2 groups bonded with Transbond XT, and Assure. After surface preparation in each group, Transbond XT composite was applied to the surfaces using silicon tubes and light-cured for 20 seconds. Then, the microshear bond strength was determined using Zwick Roell machine. The data were subjected to two-way ANOVA, Tukey’s post hoc test, Student’s t-test and the Kruskal Wallis test. Different microshear bond strengths were obtained for the bond to stainless steel brackets, amalgam and porcelain by Transbond XT and Assure resin (p<0.000). Using Assure for bonding to amalgam (7.2±1.46 vs. 10.12±4.97) and brackets (16.14±3.2 vs. 20.16±5.12; p<0.05) decreased microshear bond strength. However, Assure significantly increased the bond strength to porcelain compared to Transbond XT (28.84±6.42 vs. 22.48±3.6; p<0.01). Non-parametric Kruskal-Wallis test showed significant differences in adhesive remnant index (ARI) between the two bonding agents only in the amalgam group (p=0.029). Although the bond strength values of Assure were less than those of Transbond XT, Assure was able to create sufficient bond strength especially to porcelain.

Foreign bodies in maxillary sinuses are classified as either traumatic or iatrogenic. The routes of entry of metal foreign bodies، such as dental amalgam، are usually oroantral fistulas or traumas. The present report explains a rare case of a procedural accident that during a dental procedure. Case Report: A 30-year-old man presented to the dental office for a restorative procedure on his upper right second molar. During the dental procedure، furcation area and the inferior wall of maxillary sinus were penetrated. After packing of amalgam and suspected bleeding in the area، radiography revealed amalgam beyond the furcation area within the right maxillary sinus. The tooth was extracted and the patient was referred to a maxillofacial surgeon for treatment. Foreign bodies in paranasal sinuses، especially metal objects such as amalgam، must be removed to prevent chronic mucosal irritation or malignant mucosal alterations even if they are asymptomatic. Thus، it is recommended that dentists pay attention to the creation of oroantral fistulas during dental procedures and existence of foreign bodies in sinuses and refer the patient to a specialist، if necessary، to prevent potential complications.

During application of bleaching materials، they may come into contact with existing amalgam restorations resulting in changes in amalgam structure. The aim of the present study was to evaluate the influence of rebonding and bleaching on the release of metallic ions and microstractures of admixed and spherical amalgams. This experimental in vitro study was performed on 96 Class V cavities (3. 5 mm in length، 2 mm in width and depth) prepared on sound human premolars and restored with amalgams containing spherical and admixed particles. In half of the samples of each amalgam type rebonding procedure was carried out with Scotchbond Multi-purpose adhesive system and Guardian Seal resin sealant. Then half of the amalgam restorations، with or without rebonding، were exposed to 30% carbamide peroxide (n = 12). The amount of metallic ions released from amalgams was determined by atomic absorption spectrometry. Surface topography and compositions of two samples in each group were observed under a scanning electron microscope (SEM). Data were analyzed by t-test and multivariate ANOVA (α = 0. 05). 30% carbamide peroxide gel caused a significant increase in Hg released from amalgams in non-rebonded groups (p value < 0. 001). There was no significant difference in ion release from spherical and admixed amalgams (p value = 0. 73). Rebonding resulted in significant reduction in Hg release (p value = 0. 007). Exposure of spherical and admixed amalgams to 30% carbamide peroxide gel، without rebonding، caused a significant increase in Hg release from amalgam and changed amalgam microstructure.

Amalgam is used in dentistry cautiously، due to the toxicity of mercury in dental amalgam. Dentists are exposed to mercury vapor in their routine occupational practice، which can be harmful to their health. The aim of the present study was to measure urinary mercury concentrations in general dentists and restorative specialists in Mashhad in 2010. This cross-sectional and analytical study was performed on 45 general dentists، 10 restorative specialists، and 70 controls without any exposure to mercury. A 20 ml urine sample was taken from each of the cases before each one''s routine occupational practice. Mercury concentration of urine was measured by means of an atomic absorption spectrometry. The obtained data was analyzed using one-way ANOVA، Duncan tests، and SPSS software (V: 11. 5) at the significant level α=0. 05. Mean (SD) urine mercury level of general dentists was 9. 26± 2. 70 µg/l and 9. 13± 1. 73 µg/l in general dentists and the restorative specialists، respectively; and 1. 84± 1. 73 µg/l in the control group. There was no significant difference between urine mercury level of the general dentists and restorative specialists (P=0. 833). Urine mercury levels of general dentists and restorative specialists were greater than that of the control group (P=0/000، P=0/001، respectively). Although the urinary mercury concentrations in dentists is higher than that in the control group، it does not reach the toxic level.

Mother's milk is very suitable for the nourishment of infants. Despite the capability of breast glands to refine and purify, some poisonous metals, such as mercury, might seep into the mother's milk. The aim of this study was to determine the relationship between the number of tooth surfaces restored with amalgam and the amount of mercury in mother's milk because mercury is one of the constituents of dental amalgam. In this preliminary descriptive study the subjects consisted of breast-feeding mothers referring to a health center in Isfahan. A total of 25 systemically healthy mothers, aged 18-35, who had given birth less than two months previously, were selected. Simultaneously, 5 mothers with no amalgam restorations were selected as the control group. At first the number of tooth surfaces restored with amalgam was recorded. Then approximately 6 mL of milk were taken from each mother. The mercury levels of the milk samples were measured by cold vapor atomic absorption spectrophotometric method. Data were analyzed by SPSS using independent t-test and correlation coefficient. The average number of amalgam surfaces restored in 25 samples in the test group was 14.56. The mean of milk mercury level was 1.5748. There was a significant relationship between mercury levels of mothers’ milk and the number of amalgam restoration surfaces (p value < 0.001). Under the limitations of this study there was a significant relationship between mercury levels of mothers’ milk and the number of amalgam restoration surfaces.

Lichen Planus is a chronic mucocutaneus diseasefor which many etiologic factors have been introduced including dental amalgam restorations. The purpose of this study is to assess the relationship between amalgam restoration and oral LichenPlanus. In this case-control study 40patients with oral Lichen Planus presenting to dental faculties were selected as the case group and 44 healthy people without Lichen Planus presented to this center were selected as the control group. Case and control groups were examined and evaluated according to the number of amalgam restorations and the total number of amalgam surfaces. The relationship between amalgam restorations and oral Lichen Planus was analyzed with Mann- U- Whitney test. The average number of amalgam restorations in the case and control group s were 3.71 ±3. 12 and 3.16 ± 2.74 respectively and t he average number of total amalgam surfaces in the case and control group s were 5.62 ±6.96 and 4.53±4.07. respectively there was not any significant difference between two groups. (p=0.5),(p=0.1). there is no relationship between the number of amalgam restorations and total number of amalgam surfaces with oral Lichen Planus.

Mercury or Hydrargyrum (Hg) is the most non-radioactive toxic element known. Dental amalgam is made up of 50% mercury.. Electromagnetic fields may increase the emission of mercury from dental amalgam fillings. It was thus aimed to study the effects of electromagnetic fields of mobile use on the level of mercury released from dental amalgam restorations. In this case control clinical trial, study urinary mercury concentrations of 14 healthy University students were measured both before amalgam restoration (zero level), and on days 1, 2, 3 and 4 after restoration. All the subjects had the same diet. Dental treatment was given for all 14 students regarding 2 molars on one side (i.e the side of cellphone exposure), one class I and one class II restorations with identical volume and surface area of the amalgam fillings). All the students had not used mobile phones before the study and did not have any previous amalgam restorations. The test group consisting of seven female students were exposed to microwave radiation emitted from a Nokia 3310 mobile phone (SAR=0.96 W kg-1) that was in talk mode for 15 minutes on days 1-4 after restoration. Seven other female students who had the same condition matched the first group except exposure to microwave radiation were taken as the controls. Urine samples were collected 1 hour after each mobile use (real exposure) and one hour without mobile use (false exposure). After freezing, the samples were sent to the Toxicology Laboratory of Imam Reza Hospital (Mashhad, Iran) and mercury levels in samples were measured by cold vapor atomic absorption spectrometry. The obtained data was analysed by means of a statistical software (SPSS version 13.0) and statistical tests of ANOVA and Student-t at the significant level of P≤0.05.

Our study demonstrated an elevation of mercury level released from dental amalgam fillings after exposure to microwave radiation emitted form mobile phones. Mean (±SE) concentration levels of mercury in urine samples in the case group were 2.43±0.25, 2.71±0.27, 3.79±0.25, 4.8± 0.27 and 4.5±0.32 g/L one day before the amalgam restoration and on days 1, 2, 3 and 4, respectively. But mean Hg concentration levels in controls were 2.07±0.22, 2.34±0.30, 2.51±0.25, 2.66± 0.24 and 2.76±0.32 g/L on the respective days. Results obtained from this study show a significant increase of the mercury release in urine after mobile phone use. This finding confirms early reports that showed an increased release of mercury from dental amalgam restorations in undersea welding.

The introduction of magnetic resonance (MR) technology as a clinical imaging method has substantially increased the patient exposure to static, gradient and radio frequency of electromagnetic fields. The aim of this study was to assess the release of mercury from human dental amalgam restorations after exposure to electromagnetic fields produced by conventional MR imaging. The pre- and post-interventional study design was used for this investigation. The study participants were composed of individuals who were scheduled for brain MRI and those who had at least 4 teeth with amalgam restorations. These restorations had to be at least one week or older. Thirty individuals, who met the inclusion criteria, were referred to magnetic resonance imaging (MRI) department. A questionnaire was used for each patient to collect basic information on past exposures to electromagnetic fields, occupation and life style. Biological specimens (5cc stimulated saliva) were collected just before and after MRI procedures. The magnetic flux density was 0.23 T, and the patient’s duration of exposure to magnetic field was 30 minutes. The collected saliva samples were analyzed by laboratory for mercury level by using cold-vapor atomic absorption technique. The SPSS software and paired t-test were used for statistical analysis of mercury levels. The mean concentrations of mercury in saliva before and after MRI were 0.86 ± 0.3 mg /dl and 1.13 ± 0.5, mg /dl respectively. Data analysis using paired t-test showed a statistically significant difference between the mean concentrations of saliva mercury before and after MRI procedures. This study showed significant relationship between increased mercury levels in saliva of patients exposed to magnetic resonance imaging.

Vast usage of Amalgam and it's poisoning nature related to mercury necessited the hygiene aspects of mercury to be put in to consideration. The aim of this study was to assess knowledge, attitude and practice of dentists towards the principles of mercury hygiene. In this descriptive analytic study, 116 dentists in their private clinic were selected randomly and were analyzed for the above parameters by questionnaire. Data were analyzed in spss.14/win software with descriptive statistic methods, t test and Pearson correlation test. The mean of knowledge, attitude and practice of dentists were 45.74±13.28, 68.96±10.62 and 17.43±17.55 respectively. There was no statistically significant correlation between the knowledge and attitude and practice of principles of mercury hygiene. Besides there was no significant correlation between sex, specialty and graduation time with those parameters. Despite positive attitude and knowledge, practice of Tabriz dentists is not favorable. According to the positive attitude and the willingness of the dentists for knowledge enhancement and optimizing the practice for mercury hygiene, appropriate programming for mercury hygiene instruction during the educational period and continuing educational program can be very advantageous.

Patients always complain about metallic color of amalgam restorations. Covering amalgam by composite can solve this problem. Since polymerization shrinkage is a serious shortcoming in composites, application of the combined amalgam and composite restoration is one of the methods to reduce leakage in the cervical margins of posterior restorations. The aim of this invitro study was to evaluate the microleakage of amalgam/composite interface when Rely-X ARC adhesive resin cement was used in the joint. Twenty-four sound extracted premolars were chosen. Mesial and distal class II conventional cavities were prepared and the samples were divided into 4 groups of 12. In all groups, the bases of the cavities were restored with amalgam and then the remaining part was filled by composite resin. Specimens in groups 1 and 2 were restored with composite-resin, immediately after condensing amalgam without or with application of Rely-X ARC (3M, ESPE) respectively. In groups 3 and 4, composite resin were applied 24 hours after condensation of amalgam, without or with application of Rely-X ARC respectively. After polishing and thermocycling, all specimens were prepared for dye penetration and the degree of leakage was scored and analyzed using Kruskall Wallis test with p<0.05 as the level of significance. The frequency of dye penetration in different groups was obtained. The most and the least scores were observed in groups 3 and 4 respectively. No statistically significant difference was observed in different methods. None of the methods in this study could seal the amalgam/composite-resin interface.

Dental Amalgam is a common restorative material for posterior teeth. Because of Hg content in the composition of amalgam, during the handling of material, mercury may release as vapor in the environment. Excess amount of mercury vapor can cause serious health problems in dental personnel. The aim of this investigation was to determine mercury vapor concentration in working environment of dentists in Tehran. 211 dental clinics were participated in this cross-sectional study. The clinics were randomly selected from different regions of Tehran (north, center, south, east and west). The dentists were asked to complete a questionnaire including items on demographic characteristics such as age, sex and work history, method of handling of amalgam, environmental characteristics and general health conditions. Environmental measurements of mercury vapor in dentists’ offices were done by mercury absorption tubes (Hydrar) and personal pumps (SKC, 222-3, England) as suggested in NIOSH method. Analysis of air samples was done by atomic absorption spectrophotometery (cold vapor). The data were analyzed by non-parametric tests (Kruskall Wallis, Mann-Whitney and Kendall).P<0.05 as the level of significance. The mean mercury vapor concentration in dentists’ offices was 8.39(±9.68) µg/m³.There was no significant relationship between the urine mercury of dentists (3.107±3.95) and the air Hg vapor concentration of their offices. Using precapsulated amalgam showed significantly less Hg vapor than bulk amalgam (P=0.034). Also the surface area of working room and air Hg vapor (P=0.009) had a significant relationship (P=0.009 r=0.81). There was not any significant correlation between mercury vapor and other factors such as working hours per day and working days per week, squeezing of triturated amalgam or not, storage medium of set amalgam (water or fixer solution), mercury storage method and type of ventilation. The concentration of mercury vapor in dental office's environment was lower than threshold limit value. Based on this study the type of amalgam (precapsulated or not) and area of the working room had significant effect on the mercury vapor concentration of environment.

Dentists are exposed to mercury from dental amalgam in their routine occupational practice. Excess exposure to mercury is harmful and the measurement of mercury content of urine is a reliable and valid assessment of the level of mercury exposure from dental amalgam. The aim of this study was the measurement of urine mercury in dentists of Tehran and assessment of some possible related factors. This cross-sectional study was performed randomly on 211 dentists in all regions in Tehran city (center, north, south, west, and east) between 1381 and 1383. Dentists were asked to give a sample of urine in the day of visit and to complete a questionnaire consisting of variables such as age, working history, handling of amalgam, environmental parameters and general health situation. Urine samples were analyzed by cold vapour atomic absorption spectrophotometry. Data were analyzed by Kruskall Walis, Kendall and Mann Whitney tests, with p<0.05 as the limit of significance. The mean of urine mercury content in Tehran dentists was 3.1 (± 3.95) which was lower than the international TLV (Threshold Limit Value). There was a significant relation between urine mercury level and working hours per day (P=0.006). This relation was observed with working hours per week too (P=0.006). In general dentists, there was a positive relation between urine mercury and age (0.008) as well as the practicing years (P=0.034). A significant relation was found between urine mercury and the number of amalgam repairs and replacements in restorative specialists (p=0.039). There was a significant relation between the number of amalgam fillings in the mouth and urine mercury in general practitioners (p=0.027). The type of amalgam (predosed capsules or bulk powder) had a significant effect on the urine mercury content (P=0.001). There was no significant relation between urine mercury and other variables of the study such as the squeezing of triturated amalgam, storage method of residual amalgam, method of storing mercury and office ventilation. Based on the results of this study, the mean urine mercury content of dentists of Tehran was below the international TLV. The use of precapsulated amalgams had significant effect on the urine mercury. Most of the dentists were working in public or semiprivate clinics, so it is concluded that the level of general hygiene and specially mercury hygiene in these centers seems to be acceptable.

Dental amalgam has been one of the most widely used restorative dental material for over 150 years. Mercury is one of the main elements in dental amalgam composition. Absorption of mercury in human body can cause serious problems such as insomnia, loss of memory, mental depression and inability to concentrate. Widespread use of Dental amalgam in dental schools make a lot of mercury vapour, so, evaluation of blood mercury in dental students during their practical courses may be useful. In this study, two groups of dental students were selected. The first group included 25 clinical dental students and the second 25 preclinical dental students. All selected students were non-smokers, non-alcoholics, and neither group hadnt had new amalgam restoration nor had seafood for at least a week. Blood samples were prepared from each group. In each sample 4 ml of blood was drawn and mixed with 0.5 ml, 1% EDTA as anticoagulant. The concentration of mercury was determined by cold vapor atomic absorption spectrometry with amalgamation. The results showed significant differences between total mercury and nonorganic mercury in two mentioned groups but organic mercury had no significant difference. However means were less than 4ng/ml. According to the result of this study working with amalgam in dental school and operative department can increases blood mercury however no toxicity and serious problem for dental students could be observed. Therefore, it seems making a good air conditioned environment for exiting mercury vapor is necessary, especially in operative department. In addition special attention to control of blood mercury is necessary for assistants, staff and professors of dental school because of their permanent presence in environment containing mercury vapour.

The aim of this research was to evaluate the effect of surface treatment, clinical performance and the condition and position of the dental restoration on the corrosion behavior of dental amalgam. Commercial amalgam namely Oralloy was selected to prepare 21 flat amalgam samples. After triturating and condensation, the samples were divided into three groups and each group was finished by using one of the three clinical procedures carving, carving-burnishing, carving-burnishing-polishing. A special cylindrical mold was used in order to simulation of the inter-proximal areas and proximal surfaces of the dental restorations. Stainless steel matrix band was placed on the internal mold surfaces and amalgam paste was compacted in the mold and 14 cylindrical samples were prepared. Electrochemical tests were performed at a temperature of 37±1oC in normal saline in order to determine the corrosion behavior of dental amalgam samples. Tafel extrapolation and linear polarization methods determined corrosion potential and corrosion current densities. The mean value and standard deviations of the results were calculated. The mean values were statistically compared by ANOVA and Duncan methods at 95% level of confidence. The results showed statistically significant differences between the mean corrosion current density values of three different groups of dental amalgam(P<0.05). The carved group showed more corrosion resistance in comparison with the sample near the matrix band (P<0.05) as an index of the proximal surfaces of the dental restorations. Even a simple clinical performance could effect on the corrosion resistance of dental amalgam. The proximal surfaces of the class II restorations are not only susceptible to concentration cell corrosion but also possess less corrosion resistance.

Amalgam restorations often tarnish and corrode in the oral environment. The degree of tarnish and the resulting discoloration appear to be dependent on the parameters such as oral environment, oral hygiene, and the particular alloy employed and clinical procedures. The aim of this research was to evaluate and compare the effect of clinical procedures such as carving, carving-burnishing and carving-burnishing-polishing on the tarnish and corrosion behavior of four brand dental amalgams. Method & Materials: Four different type of commercial amalgam alloy powders with different powders with various particles shape (lathe cut, spherical, spheroids) namely Sybraloy (Sy), Cinalux (CL), Oralloy (Or) and cinaalloy (Ca) were studied. A special mold was used to prepare the samples of each type of commercial amalgams. Twenty-one samples of each type of amalgams were prepared. After trituration and condensation, the samples of each type of amalgams were divided into three groups and each group was finished by using one of three procedures carving, carving-burnishing, carving-burnishing-polishing. Electrochemical potentiodynamic tests were performed at a temperature of 37±1 °C in order to determine and compare the corrosion behavior of dental amalgams, as an indication of biocompatibility. The results showed statistically significant differences between the mean corrosion current densities values of three different groups of each type of commercial amalgam (P<0.05). The polished group of each type of commercial amalgams possesses the lowest corrosion current density and the carved group shows the highest corrosion current density (the lowest corrosion resistance). This trend was not affected by the brand and chemical composition of commercial amalgams. The polished Sybraloy amalgam possesses the highest corrosion resistance between four types of polished amalgams and the polished Cinaaloy amalgam showed the lowest corrosion resistance. The similar trend was observed in carved group and carved-burnished group of four types of amalgams. It was concluded that the clinical operations and procedures could influence the tarnish and corrosion behavior of high copper dental amalgams. Polishing procedure increases the corrosion resistance of high copper dental amalgams and is more effective on the corrosion behavior of dental amalgams, which are less corrosion resistant in compare with the dental amalgams that are more corrosion resistant.