Avicenna Journal of Dental Research
Volume:12 Issue: 3, Sep 2020

The present study aimed to investigate the effect of working in the dental radiology department on the frequency of micronucleus.

In this cross-sectional study, Papanicolaou staining was used to count the micronucleus in 63 individuals working in the dental radiology department. The presence of micronucleus cells and their mean frequency in each cell were investigated. Mann- Whitney U test, t test, and chi-square test were used to determine the effect of age, gender, and employment duration on micronucleus frequency per cell.

The mean frequency of micronucleus per cell in the control and case groups was not statistically significant (P=0.4). In addition, no statistically significant difference was observed in males and females regarding the mean frequency of micronucleus per cell (P=0.6). Employment background and age had no significant impact on the percentage of micronucleus-containing cells and the mean frequency of micronucleus per cell.

Working in a dental radiology center had no impact on the percentage of micronucleuscontaining cells and the mean frequency of micronucleus per cell.

The prevalence and severity of tooth decay have shown a significant increase in the past 20 years. This study evaluated the relationship between the amount of tooth decay and body mass index (BMI) in 6-12 year-old children in Ilam during 2016-2017.

The population of this cross-sectional study consisted of 270 female and 250 male students in Ilam. Their weight and height and BMI were measured for each individual and the information on the examination of children’s teeth was inserted into relevant tables. Other research data (i.e., dietary habits, oral health instruction, and socioeconomic conditions) were gathered using a valid and reliable questionnaire.

There was no significant relationship between the amount of tooth decay and BMI among 6-12 children in Liam. Except for the 11-year-old (n=86) group demonstrating an inverse relationship between dmft and BMI (r = -0.185), an inverse relationship was found between the decay and observation of health although there was a direct relationship between the consumption of sugar materials and tooth decay.

The results of the study revealed no significant relationship between the amount of tooth decay and BMI among 6-12 children in Ilam except for 9-year-old and 11-year-old groups.

Preventing caries or stopping primary caries lesions is one of the most important goals of oral health care. The aim of this study was to compare the effect of flavonoids and the whey extract on tooth enamel by measuring the microhardness of enamel following its demineralization.

In general, 42 samples of healthy enamel were prepared in this experimental-laboratory study. After measuring the initial microhardness using Vickers hardness tester )Buehler, Lake Bluff, IL, USA(, the samples were immersed in the demineralization solution for 4 days and re-tested for microhardness. Then, the samples were randomly divided into three groups of 14 and treated, including the grape seed extract w/v8%, the whey extract, and the artificial saliva. The samples were in contact with the treatment material for 8 days in an incubator at 37° C and then their microhardness was evaluated again.

The analysis of covariance showed that there was a significant difference in the amount of microhardness changes between the study groups (P<0.001) so that microhardness changes were the highest in the grape seed extract group while they decreased in the control group. However, the post hoc test showed no statistically significant difference between the whey extract and grape seed extract groups (P=1.000). Finally, the control group had a statistically significant difference from the whey extract and grape seed extract groups.

Both grape seed extract and whey extract increased remineralization and the microhardness of tooth enamel compared to the control group. Thus, these two substances can be considered as natural and effective substances in the non-invasive treatment of carious lesions.

This study aimed to assess the microhardness and morphology of permanent dentin following the application of Iranian and foreign-made desensitizing toothpastes.

This in vitro, experimental study evaluated 48 dentin samples prepared of the extracted sound human permanent molars. Dentin samples were randomly divided into three groups (n=16) and subjected to the application of Pooneh Iranian desensitizing toothpaste, Colgate Sensitive ProRelief (Poland), and no intervention (negative control). Each dentin sample was then immersed in 5 mL of a demineralizing solution for 10 hours and underwent a demineralization/remineralization cycle (pH cycling) for 14 days. The mean microhardness of the samples was measured at baseline after demineralization and after 14 days. One sample of each toothpaste group was selected for the scanning electron microscopy (SEM) assessment of dentin morphology. Finally, repeated-measures ANOVA was used to analyze the effect of time and type of toothpaste on microhardness using SPSS, version 21.

The comparison of the mean microhardness of the control group with experimental groups revealed no significant difference at baseline or after demineralization (P>0.05) although this difference was significant after 14 days (P<0.001). The mean microhardness of the two toothpaste groups was not significantly different at different time points (P>0.05). Finally, the SEM assessment revealed a greater tubular obstruction in Pooneh group after 14 days.

Pooneh Iranian-made desensitizing toothpaste was comparable to Colgate Sensitive Pro-Relief foreign-made desensitizing toothpaste in terms of the microhardness of permanent dentin. It even demonstrated superior performance with regard to the obstruction of dentinal tubules.

The ostiomeatal complex (OMC) is not a separate anatomical structure although it is a functional unit of structures, including the middle meatus, uncinate process, infundibulum, maxillary sinus ostium, ethmoidal bulla, anterior ethmoid sinus ostium, and frontal recess. Concha bullosa is the pneumatization of the concha, which is one of the most common anatomical variations in the middle turbinate.

This study was conducted using the cone-beam computed tomography (CBCT) images of 172 patients in the archives of the Department of Oral and Maxillofacial Radiology, Dentistry School, Ahvaz Jundishapur. Patient information including age and gender, presence or absence of concha bullosa, the involved side (left or right), and its type (i.e., extensive, lamellar, and bulbous) were collected in the information form. Finally, the chi-square test (with SPSS, version 22) was used to analyze the data, and P value less than 0.05 was considered statistically significant.

Patients with and without concha bullosa were 39.1 and 41.7 years, respectively, but it was no significant difference in terms of age (P=0.321). Out of 52 patients with concha bullosa, 19 (36.5%) cases were males and 33 (63.5%) of them were females. The prevalence of concha bullosa was higher for the bilateral side (20 patients, 38.5%, P=0.000). The prevalence of bulbulsand lamellar-shape was nearly the same (32.7% and 30.8%, respectively). Eventually, the extensive shape with 36.5% was more frequent for the shape of concha bullosa (P=0.000).

The prevalence of concha bullosa was high. There was no significant difference in terms of age (P=0.321) and gender (P=0.058) of patients with concha bullosa. The extensive type and the bilateral appearance of concha bullosa were more significant (P=0.000).

Identification of human remains is the first essential phase of forensic investigation and is significant for subsequent analyses. Mandible is the most dimorphic, largest, and hardest bone of skull and plays a decisive role in sex determination, especially when the complete skull is not available. This study aimed to examine the accuracy of mandibular ramus assessment in sex discrimination using panoramic radiography.

A total of 135 panoramic radiographs (68 males and 67 females; aged 0-75 years) were retrieved from the database of the Department of Oral and Maxillofacial Radiology, Ahvaz Jundishapur University of Medical Sciences, Iran and divided into five groups :4-14, 16-30, 31-45, 45-60, and 61- 75 years. The following four parameters were measured on the radiographs utilizing the mouse-driven method to determine sex: coronoid height (CRH), ramus height (RH), mandibular body height (MBH), and bicondylar breadth (BB). The radiographs were processed using the SCANORA® software. Data were analyzed using receiver operating characteristics (ROC) graphs, t test, and the IBM SPSS software version 22.0 (IBM Corp., Armonk, N.Y., USA).

The percentage of certainty of each variable regarding the determination of sex from an unknown human mandible bone was as follows: RH=84.6%, CRH=82.4%, BB=73.5%, and MBH=83.8%, indicating that RH alone could categorize the sex in 84.6% of the cases (highest accuracy), CRH in 82.4%, BB in 73.5% (lowest accuracy), and MBH in 83.8%. The average accuracy in sex determination was 89% using all four variables.

All the variables studied in the present study revealed a reliable extent of certainty for sex discrimination of unidentified skeletal remains. The overall accuracy of all variables altogether was 89%

Preventing caries or stopping primary caries lesions is one of the most important goals of oral health care. The aim of this study was to compare the effect of flavonoids and the whey extract on tooth enamel by measuring the microhardness of enamel following its demineralization.

In general, 42 samples of healthy enamel were prepared in this experimental-laboratory study. After measuring the initial microhardness using Vickers hardness tester )Buehler, Lake Bluff, IL, USA(, the samples were immersed in the demineralization solution for 4 days and re-tested for microhardness. Then, the samples were randomly divided into three groups of 14 and treated, including the grape seed extract w/v8%, the whey extract, and the artificial saliva. The samples were in contact with the treatment material for 8 days in an incubator at 37° C and then their microhardness was evaluated again.

The analysis of covariance showed that there was a significant difference in the amount of microhardness changes between the study groups (P<0.001) so that microhardness changes were the highest in the grape seed extract group while they decreased in the control group. However, the post hoc test showed no statistically significant difference between the whey extract and grape seed extract groups (P=1.000). Finally, the control group had a statistically significant difference from the whey extract and grape seed extract groups.

Both grape seed extract and whey extract increased remineralization and the microhardness of tooth enamel compared to the control group. Thus, these two substances can be considered as natural and effective substances in the non-invasive treatment of carious lesions.