A possible association between medial depression of mandibular ramus and maximum bite force

Background: Medial depression of the mandibular ramus (MDMR) is an anatomical depression with unknown aetiology and described as a result of a slender mandibular ramus in the area of the mandibular notch. It is suggested that MDMR may be due to variations in muscle functions. The aim of this study is to compare the bite force of patients with and without MDMR detected on panoramic radiographs. Materials and methods: One hundred and ten patients (55 women and 55 men; mean age 22.69 ± 2.85 years) participated in this study. Patients were divided into two groups based on the presence of MDMR. Bite force of 55 patients with MRMD and 55 patients without MDMR were determined using a bite force sensor. Non-parametric tests were used to assess differences between groups. Results: Measurements showed statistically significant differences in bite force between genders (p = 0.00) with men having higher values (535.98 ± 187.85 N) than women (363.59 ± 139.56 N). The mean bite force in the sides with and without MDMR was 538.19 ± 196.94 N and 396.22 ± 157.69 N, respectively. There was a statistically significant difference between groups with and without MDMR (p = 0.00). There was no statistically significant difference in bite force between groups according to Angle’s classification (p = 0.581).Conclusions: This study suggests that the presence of MDMR may be an indicator of high muscle activity. Patients with MDMR should be carefully examined for the risk of relapse prior to any surgical intervention

Evaluation of volumetric measurements on CBCT images using stafne bone cavities as an example

Background: The aim of the present study is to evaluate the efficacy of CBCT in volume measuring using Stafne Bone Cavities (SBC) as an example. Material and Methods: The study was conducted with 14 subjects with SBC detected on panoramic radiographs. In order to evaluate lesions volumetric dimensions, CBCT images for each patient were captured. Files in Digital Imaging and Communications in Medicine (DICOM) format were transferred into a medical image processing program (ITK-SNAP 2.4.0) and volume in mm 3 of the cavities were measured using semi-automatic segmentation procedure by 2 observers blinded to each other over a one-month period. Inter-reliability of volumetric measurements between observers was compared. SBCs relation to mandibular canal was also examined and three types of relation were observed; type 1: mandibular canal is separated from the SBC, type 2: mandibular canal is in contact with SBC, type 3: mandibular canal goes through the SBC. Results: There were 12 males and 2 females who had SBC in this study (age range: 37-73, mean age: 55.3 years). The total volume of SBC in patients ranged from 160 mm 3 to 520 mm 3 (mean: 361.7 mm 3 ). There was no significant difference between observers for volume measurements ( p >0.05). According to relationship of SBC with mandibular canal, most SBCs were Type 1 (64.3 %) followed by type 3 (21.4 %) and type 2 (14.3 %). Pearson correlation coefficient shows a positive correlation between lesions volumetric size and relation with mandibular canal (pearson correlation = 0.54, sig < 0.05). Conclusions: Based on the results of this preliminary study, CBCT was considered to be an effective radiographic technic for measuring volumetric sizes of SBCs. However further studies with larger sample sizes are needed to prove the usefulness of CBCT in volume measurement

Allergic Contact Dermatitis Caused by Laurel Leaf Oil

info:eu-repo/semantics/publishedVersio

Supporting the diversity of the E-learning 2.0 learners: The development of a psychological student model

Peer reviewe

The evaluation of the relationship between cervical vertebral anomalies with skeletal malocclusion types and upper airway dimensions

Adisen, Mehmet Zahit/0000-0002-5493-8390WOS: 000527866200004PubMed: 30063196Objectives: To compare the prevalence of cervical vertebral anomalies (CVAs) in different skeletal malocclusions and to evaluate the relationship between upper airway dimension and vertebral anomalies. Methods: A retrospective study was performed on lateral cephalometric radiographs of 2062 patients aged 7-49 years. Skeletal malocclusion type, presence of CVAs, and upper airway area of 1856 patients who met the inclusion criteria of the study were recorded. The obtained data were transferred to the SPSS program for statistical analysis. Results: The mean age of the patients was 13.8 +/- 3.7 years. The prevalence of CVAs was 45.7%. There was no significant difference in prevalence between skeletal malocclusions (p = 0.89). According to airway measurements, no significant difference was found between patients with and without CVAs (p = 0.718). Conclusion: The present results suggest that there is no direct effect of skeletal malocclusion type and upper airway dimension in the etiology of CVAs

Prevalence of ponticulus posticus among patients with different dental malocclusions by digital lateral cephalogram: a comparative study

Adisen, Mehmet Zahit/0000-0002-5493-8390WOS: 000397584300008PubMed: 27515304The aim of the present study was to investigate the prevalence of ponticulus posticus among patients with dental Angle class I, II, and III malocclusions in Middle Anatolian population. A total of 1246 cephalometric radiographs were examined in a 6 months period. Each patient was assigned an identification number, and demographic information, absence/presence of PP, if present, type of PP and type of dental malocclusion were recorded by two observers. In cases where there was any disagreement, a third observer was consulted. Distributions of obtained values were analysed using Pearson's Chi-square test. The mean age of subjects was 20.98 +/- 6.95 years (range 10-39). In the analysed sample, PP had a prevalence of 18.8 % (complete form 9.6 %, incomplete form 9.2 %). There was a significant difference between genders (p = 0.002) (more prevalent in male patients: 119/522; 23 %). No significant difference was found between age groups (p > 0.05). PP was most frequently detected in Angle class III patients (78/351; 22.2 %) but there was no significant difference between malocclusion groups (p > 0.05). In the present study, PP is found to be a relatively common anomaly in patients with dental malocclusions. Although Angle class III patients showed a higher frequency of PP, statistically no significant difference was found among dental malocclusion groups

Ex Vivo Mercury Release from Dental Amalgam after 7.0-T and 1.5-T MRI

Yilmaz, Selmi/0000-0001-9546-6548; Yilmaz, Selmi/0000-0001-9546-6548; Adisen, Mehmet Zahit/0000-0002-5493-8390WOS: 000442165000025PubMed: 29944087Purpose: To evaluate ex vivo mercury release from dental amalgam after 7.0-T and 1.5-T MRI. Materials and Methods: The authors evaluated 60 caries-free molar or premolar teeth that had been extracted for clinical indications. Two-sided cavities were opened in each tooth and amalgam fillings applied. After 9 days, two groups of 20 randomly selected teeth were placed in 20 mL of artificial saliva immediately followed by 20 minutes of MRI exposure at 1.5 or 7.0 T. A control group of teeth was placed in artificial saliva without undergoing MRI exposure. The teeth were removed from the artificial saliva 24 hours later, and the saliva was analyzed for mercury content by using inductively coupled plasma mass spectrometry. One-way analysis of variance was used to compare the mean mercury values among the three independent groups, and the Tukey test was used for multiple comparisons of the mean values. Results: The mean mercury content of the artificial saliva was 673 mu g/L +/- 179 in the 7.0-T MRI group, 172 mu g/L +/- 60 in the 1.5-T MRI group, and 141 mu g/L +/- 152 in the control group. The mercury content in the 7.0-T group was greater than that in both the 1.5-T group (P <.001; 95% confidence interval: 368 mu g/L, 633 mu g/L) and the control group (P <.001; 95% confidence interval: 416 mu g/L, 648 mu g/L). There was no statistically significant difference in mercury content between the 1.5-T and control groups (P = .84; 95% confidence interval: 164 mu g/L, 110 mu g/L). Conclusion: In an ex vivo setting, mercury was released from amalgam fillings after exposure to 7.0-T MRI but not 1.5-T MRI. (C) RSNA, 2018.Kirikkale University Scientific Research Projects Coordination UnitKirikkale University [2017/36]Supported by Kirikkale University Scientific Research Projects Coordination Unit (project no. 2017/36)