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Showing 3 results for ابوالقاسم زاده
Evaluation of the general dentists’ problems during and after posterior composite filling in Babol
Reza Judi, Faezeh Abolghasemzade,
Volume 4, Issue 1 (March- 2015)
Abstract

Introduction: Posterior composites are one of the most popular filling materials. The aim of this study was to evaluate the problems of general dentists during and after posterior composite restorations in city of Babol.

Materials &Methods: In this study, data were collected using questionnaire about the problems during and after posterior composite filling. Then data were analyzed by chi square test.

Results: The highest complains of patients after posterior composite filling were related to the food impaction (33.4%), the most clinician's problem during posterior composite filling was inadequate proximal contact (37.2%) and most of dentists used pressing matrix band for proper proximal contact (31.2%). Most of dentists used incremental technique for composite filling (49.3%) and two-step total etch adhesives (68.7%) according to the manufacturer's instructions (44.2%) and applied wet polishing technique (75.6%) and major criteria for choosing composite as restorative material in posterior teeth were the ability of isolation (41.8%).

Conclusion: Increasing the knowledge of dentists about these restorations may reduce the associated problems during and after composite filling.


Influence of different light sources on visual shade matching performance
Romina Roodgarian, Toloo Jafari, Soraya Khafri, Faezeh Abolghasemzadeh,
Volume 5, Issue 2 (September- 2016)
Abstract

Introduction: The shade selection ability of dentists is a necessary element in natural tooth color recreation. Visual shade selection is affected by light source variables. The aim of this study was to compare the results of shade matching under three light conditions.

Materials &Methods: The Ishihara test was doneon58 volunteers participated in this study: 40 dental interns, 10 Postgraduate students of restorative dentistry, 8 Postgraduate students of prosthodontics. Totally, 9 classical vita shade tabs were randomly chosen and their codes were covered. The participants matched these 9 shades with a complete classical vita shade under the lighting condition in the dental office, natural light and corrected light source. Matching scores were computed and the mean of the color differences between the citation shades and the chosen shades counted with ΔEab* formula. The data were analyzed using Mann-Whitney, Friedman and Wilcoxon test.

Results: The average of shade matching scores with correcting light (7.87) was higher than the lighting conditions in the dental office (3.94) and natural light(5.53). Comparison of ΔE between three light conditions was significant (P<0.05). No significant difference was found in shade matching scores by sex (P>0.05).There was a significant difference between scores of under-graduate and post-graduate students (P<0.05).

Conclusion: To achieve successful shade matching, it is recommended to use the corrected light source. The combination of using corrected light and training can improve shade matching performance.


Scanning electron microscope and shear bond strength analysis of Biofix and Orthocem two-step fluoridated orthodontic adhesives on human enamel
Fatereh Samadi, Manouchehr Rahmati Kamel, Valiollah Arash, Soraya Khafri, Faezeh Abolghasemzadeh,
Volume 8, Issue 2 (September- 2019)
Abstract
Introduction: The bonding process in orthodontic treatment is very important. This study aimed to evaluate the shear bond strength (SBS) and bond failure sites of stainless steel brackets bonded with two new two-step adhesives (Biofix (BF) and Orthocem (OC)) and a three-step adhesive (Transbond XT (TXT)).
Materials & Methods: In this in vitro study, 66 extracted human premolars were collected and randomly divided into three groups (n=22). The brackets were bonded to each tooth with a) TXT, b) BF, and c) OC adhesives according to manufacturers’ instructions. The SBS values of the brackets were measured 24 hours after thermocycling. Adhesive remnant index (ARI), enamel detachment index (EDI) and bond failure locations on bracket surfaces were qualitatively and quantitatively assessed using stereomicroscopic, scanning electron microscope (SEM) and energy dispersive x-ray (EDX) analyses. The data were analyzed using SPSS 22 software and ANOVA test. The significance level was defined at P<0.05.
Results: The means and standard deviations of SBS values for TXT, BF and OC adhesives were 22.49±4.58, 17.82±6.43 and 16.20±4.46 MPa, respectively. The SBS in the TXT group was significantly different from the two other groups, but the difference was not significant between the two other groups. Moreover, ARI and EDI were not significantly different between the three groups. The SBS values of BF (P<0.001) and OC (P<0.001) were not significantly different.
Conclusion: The adhesive SBS in the BF and OC groups was in the determined ranges to bond the orthodontic brackets. Therefore, these two adhesives can be used as a proper alternative for conventional bonding methods.

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