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Showing 4 results for Mohajer
The effect of calcium hydroxide as an intracanal medication of the apical microleakage
F. Mokhtari, N. Joshan, Ar. Heshmat Mohajer, Y. Khalil Sefat,
Volume 24, Issue 3 (21 2011)
Abstract

Background and Aims: Nowadays, calcium hydroxide is used as a dressing for canal sterilization and repair progression of apical lesions. The aim of this study was to investigate the effect of calcium hydroxide as an intracanal medicament on the apical microleakage of root filling.
Materials and Methods: In this experimental study, 46 extracted single-rooted human teeth were instrumented with step-back technique to master apical file (MAF) size 35. Specimens were randomly divided into 2 groups (n = 20). In group 1, the specimens were treated with calcium hydroxide intracanal medication and in group 2, the samples did not receive any medication. The teeth were incubated in 100% humidity at 37°C for one week. After that, calcium hydroxide was removed using irrigation with normal saline and reaming with MAF. The root canals were obturated with gutta- percha and AH26 sealer using lateral compaction technique. Specimens were incubated in 100% humility at 37°C for 72 hours and then immersed in India ink for 1 week. Finally, the teeth were cleared and the maximum linear dye penetration was measured under a stereomicroscope at 4X magnification. The data were analyzed by T-test and Chi-square.
Results: There was no significant difference between the two experimental groups (P=0.068).
Conclusion: The findings of this study indicated that using calcium hydroxide as an intracanal medicament did not influence the apical microleakage after final obturation of the root canal system.


Designing and evaluation of validity and reliability of a new device for measurement of axial wall tapering of prepared teeth for fixed crown prosthesis
Hamid Jalali, Farzaneh Farid, Abdolsalam Abobakry, Maryam Mohajerfar,
Volume 25, Issue 2 (9 2012)
Abstract

Background and Aims: The purpose of this study was to design a new device assisting dental students to measure the tapering of the prepared teeth for fixed crown prosthesis in which the desired tapering for better clinical prognosis could be obtained.

Materials and Methods: The designed device in this study had two arms that were placed on two opposite walls of the prepared teeth. To evaluate the validity and reliability of this device, 3 dies with different degrees (13, 29 and 45°) were used and 20 teeth were prepared by dental students with undefined tapering degrees. The measurements of tapering were performed by six last year-dental students in two different time periods. Comparison of errors in measurements on standard dies between observers and between time intervals were analyzed by (Wilcoxon) Paired t-test with a significance level of α=0.05.

Results: For the three dies used in this study, we compared the differences for each measurement taken by observers with the standard taper of the dies. Maximum difference of measurements with true standard die tapering was 1 degree. A number of 6 measurements were under the true standard tapers and 2 measurements were above it. Interclass Correlation Coefficients (ICC) of the first and second measurements on prepared teeth were 97.4 and 97.5, respectively.  There were no significant differences between different observers or two measurements of the same observer in different time intervals (P>0.05).

Conclusion: The results indicated that this device can be valid and reliable for measuring the angle of convergence of the prepared teeth and can be used as an educational device in dental schools as a replacement for previous tapering measurement methods.


Effect of pulp tester probe placement site on the response of maxillary anterior teeth
Jalil Modaresi, Amir Reza Heshmat Mohajer, Hossein Aghili, Morteza Khorshidi, Faramarz Rostami Chavoshlo, Amirmohamad Mahabadi,
Volume 25, Issue 3 (1 2012)
Abstract

Background and Aims: Electric pulp testing is used for diagnosis of the pulp status. This test is technique sensitive and hence may elicit positive or negative false response in case of inaccurate use. The optimal site for placement of the probe tip has not been determined. The aim of this study was to evaluate the effect of pulp tester probe placement site on the response of maxillary teeth.
Materials and Methods: A total of 378 teeth (126 central incisors, 126 lateral incisors and 126 canines) in 67 voluntary 20-35 year-old patients were selected. Three sites on each tooth (incisal edge, labial and lingual surfaces) were tested with an electrical pulp tester and responses were recorded. Data were analyzed by Repeated Measure ANOVA test.
Results: The central teeth showed significantly lower sensation threshold than lateral and canine teeth (P<0.001). The incisal edge of tooth were significantly more sensitive compared to labial and lingual surfaces (P=0.008).
Conclusion: This study showed that the optimum site for placement of pulp tester probe was incisal edge.


Evaluation of the effect of tranexamic acid with Gelfoam carrier in preventing dry socket syndrome following surgical removal of impacted mandibular third molars
Misagh Mohajer, Hassan Mesgari, Behnaz Pourian, Javad Nosrati Momvandi, Masoud Hassanzadeh,
Volume 39, Issue 0 (3-2026)
Abstract
Background and Aims: Dry socket is one of the most common complications following dental surgery. Therefore, effective prevention of dry socket can significantly improve patient recovery after tooth extraction. The aim of this study was to evaluate the effect of tranexamic acid combined with a Gelfoam carrier on the prevention of dry socket following surgical removal of impacted mandibular third molars.
Materials and Methods: This parallel randomized clinical trial was conducted in 2023 on 72 patients (40 in the intervention group and 32 in the control group) at the Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Islamic Azad University, Tehran Unit. In the intervention group, 250 mg of tranexamic acid powder was placed into the extraction socket and covered with Gelfoam, whereas the control group received sterile gauze only. The diagnosis of dry socket was made 2–3 days postoperatively by an independent surgeon. Statistical analysis was performed using the chi-square test, likelihood ratio, and Fisher’s exact test, with a significance level set at P<0.05.
Results: The incidence of dry socket was 7.5% in the intervention group and 34.4% in the control group. All statistical tests demonstrated a significant reduction in the occurrence of dry socket in the intervention group (P≤0.005). These findings are consistent with the physiological mechanism of tranexamic acid in inhibiting fibrinolysis and stabilizing the blood clot, resulting in a marked reduction compared with the control group.
Conclusion: Topical application of the tranexamic acid in combination with Gelfoam following extraction of impacted third molars is an effective, simple, and cost-effective method for the prevention of dry socket. For broader clinical recommendation, further studies with larger sample sizes, comparisons with existing standard preventive methods, and longer follow-up periods are suggested.

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