Journal of Medical and Dental Investigations最新文献

{"title":"Does a sloped neck implant design facilitate All-on-4 surgeries? A three-dimensional finite element analysis","authors":"M. Toprak","doi":"10.5577/jomdi.e230310","DOIUrl":"https://doi.org/10.5577/jomdi.e230310","url":null,"abstract":"Aim: In the treatment of edentulous resorbed mandibles using All-on-4 concept, the distal part of posteriorly tilted implants with a conventional flat neck design is usually embedded in the bone, which may lead to improper installation or positioning of angled multiunit abutments. Bone trimming from the distal area, where the implant neck is embedded in the bone, is typically necessary to avoid this complication. This study aimed to evaluate the biomechanical behavior of a sloped marginal neck configuration of implant posteriorly tilted at 30° in edentulous mandibles using a three-dimensional finite element analysis (FEA).\u0000Methodology: The sloped neck implants were posteriorly tilted at 30° without any further operation in the edentulous mandibular model designed using the FEA. The tilted conventional flat neck implants were placed at the same length, diameter, and angle, and 2 mm2 of bone was trimmed from the distal area. Similar multiunit abutments, two conventional flat neck implants axially placed on the anterior side, titanium frameworks, and acrylic resin prosthetic dentures were created for both models. The biomechanical behaviors of the models were evaluated by applying a foodstuff force of 50 N to the incisors, 100 N to the premolars, and 150 N to the molar cantilever.\u0000Results: The von Mises stress value of the sloped neck implants (158.489 MPa) was lower than that of the conventional flat neck implants (177.208 MPa). Both the maximum and minimum principal stress values ​​in the surrounding cortical and cancellous bones were within the acceptable physiological limits.\u0000Conclusion: Sloped neck implants can be placed easily and are less invasive than conventional flat neck implants; thus, they can be a treatment alternative that can facilitate the All-on-4 concept.\u0000 \u0000How to cite this article:\u0000Toprak ME. Does a sloped neck implant design facilitate All-on-4 surgeries? A three-dimensional finite element analysis. J Med Dent Invest 2023;4:e230310. https://doi.org/10.5577/jomdi.e230310\u0000 \u0000Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.","PeriodicalId":415108,"journal":{"name":"Journal of Medical and Dental Investigations","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130562721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of time exposure of different irrigation agents on radicular dentin erosion","authors":"Ömer Ferşat Okumuş, S. Kaya, Özkan Adıgüzel, Merve Yeniçeri Özata","doi":"10.5577/jomdi.e221170","DOIUrl":"https://doi.org/10.5577/jomdi.e221170","url":null,"abstract":"Aim: The amount of root dentin erosion caused by Ethylene diamine tetraacetic acid (EDTA), Glycolic acid (GA), and Etidronic acid (HEDP) solutions applied with sonic activation (SA) for 1 and 3 minutes during the final irrigation was evaluated in this in vitro study.\u0000Methods: Using 5 ml of 2.5% NaOCl irrigation solution in each sample, 70 mandibular premolars were enlarged with the Reciproc R25 rotary instrument system. The samples were randomly divided according to the final irrigation protocol into 6 experimental groups (n:10) and 1 control group (n:10): Group 1   (17% EDTA – 1 min SA), Group 2   (17% EDTA – 3 min SA), Group 3   (10% GA – 1 min SA), Group 4   (10% GA – 3 min SA), Group 5   (18% HEDP – 1 min SA), Group 1   (18% HEDP – 3 min SA) and Group 7   (Negative control group-distilled water, 1 min SA). The teeth were divided into two parts longitudinally after the final irrigation protocol. A low vacuum scanning electron microscope (SEM) was used to image the samples’ coronal, middle, and apical root areas at x2000 magnification. Samples were evaluated using a triple-scoring system.\u0000Results: Data were analyzed by Shapiro Wilk, Kruskal Wallis H, Mann-Whitney U, and Dunn’s tests. There was no statistically significant difference between EDTA, GA, and HEDP in both periods (p > 0.05).\u0000Conclusion: We saw similar amounts of erosion in dentin in 1 and 3 minutes of chelation applications for all chelators. Considering the smear removal efficiency of chelators, there is no harm in increasing the time in terms of erosion. There is a need for studies on the clinical applicability of chelation with a different duration time.\u0000 \u0000How to cite this article:\u0000Okumuş ÖF, Kaya S, Adıgüzel Ö, Yeniçeri Özata M. Evaluation of time exposure of different irrigation agents on radicular dentin erosion. J Med Dent Invest 2022;3:e221170. https://doi.org/10.5577/jomdi.e221170\u0000 \u0000Linguistic revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.\u0000 \u0000Checked for plagiarism: Yes","PeriodicalId":415108,"journal":{"name":"Journal of Medical and Dental Investigations","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121610876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of the knowledge levels of dentists and healthcare personnel regarding the changes in dental practice that had occurred during the COVID-19 pandemic","authors":"U. Yilmaz, Fatma Eriş Derkuş, Berivan Dündar Yılmaz","doi":"10.5577/jomdi.e221164","DOIUrl":"https://doi.org/10.5577/jomdi.e221164","url":null,"abstract":"Aim: Coronavirus disease 2019 (COVID-19), which has been declared a pandemic by the World Health Organization, poses a great risk of transmission throughout society, especially among healthcare workers. The aim of this study was to evaluate the knowledge levels of dentists and healthcare personnel regarding the changes in dental practice that had occurred during the COVID-19 pandemic.\u0000Methods: An online questionnaire was sent to dentists and health personnel working in Diyarbakır, Turkey within the period from December 30, 2021 to January 6, 2022, using WhatsApp, e-mail, and special social platforms. The questionnaire was designed to identify the sociodemographic characteristics of the respondents and their awareness of new clinical procedures and of the changes in dental practice that had occurred during the COVID-19 pandemic. The data obtained from 239 dentists and healthcare personnel in Diyarbakır [118 (49.4%) female and 121 (50.6%) male; 177 dentists and 62 healthcare personnel] were evaluated.\u0000Results: Of the dentist participants, 12.7% reported that they did not perform active dental treatment during the COVID-19 pandemic due to their concerns about being infected by their patients with COVID-19 or their existing comorbidities (chronic diseases). Of the participants, 24.6% had acquired COVID-19. Most of the participants used personal protective equipment when conducting all types of dental procedures, including examinations.\u0000Conclusion: Dentists and healthcare personnel play an important role in controlling COVID-19 infection. It is very important to be aware of the possible transmission routes of COVID-19 in clinical applications, to use protective equipment during treatments, and to pay attention to personal hygiene.\u0000 \u0000How to cite this article:\u0000Yılmaz UN, Eriş Derkuş F, Dündar Yılmaz B. Evaluation of the knowledge levels of dentists and healthcare personnel regarding the changes in dental practice that had occurred during the COVID-19 pandemic. J Med Dent Invest 2022;3:e221164. https://doi.org/10.5577/jomdi.e221164\u0000 \u0000Linguistic revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.\u0000 \u0000Checked for plagiarism: Yes","PeriodicalId":415108,"journal":{"name":"Journal of Medical and Dental Investigations","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127351430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of the impact of different irrigation agents and temperatures on the bond strength of resin cement used in bonding fiber posts to dentin","authors":"Faruk Öztekin, S. Tekin","doi":"10.5577/jomdi.e221150","DOIUrl":"https://doi.org/10.5577/jomdi.e221150","url":null,"abstract":"Aim: The aim of this study was to evaluate the bond strength of resin cement used in bonding fiber-reinforced composite pulp to canal dentin walls treated with various irrigation agents at different temperatures.\u0000Methods: Seventy-two extracted teeth (single-rooted lower first and second premolars) were used. The teeth were divided into six groups according to the final irrigation solutions applied to the post cavity (n = 12 in each group). The groups were as follows: QMix 2 in 1, 25ºC (group 1); QMix 2 in 1, 40°C (group 2); 2% chlorhexidine digluconate (CHX), 40°C (group 3); 17% ethylenediaminetetraacetic acid (EDTA), 25 °C (group 4); 17% EDTA, 40°C (group 5); and CHX, 25°C (group 6). The irrigation agents were applied for 60 seconds, and root canals were dried. Horizontal sections were obtained 24 hours after fiber post cementation. The bond strength between the fiber post and dentin wall was measured using a push-out tester and recorded. The difference between the two groups was determined by the independent Student’s t-test, one-way ANOVA, and Tukey HSD post-hoc test for more than two groups (p<0.05).\u0000Results: The highest apical strength was observed in group 2 (42.240 ± 4.969) and the lowest in group 6 (2.160 ± 0.825). The highest coronal strength was observed in group 5 (55.435 ± 5.396) and the lowest in group 3 (5.139 ± 0.977) (p<0.05). There was a statistically significant difference between the coronal and apical regions in group 1 and group 6 (p<0.05).\u0000Conclusion: The best bonding strength in apical regions was obtained using QMix 2 in 1 (40ºC), and the best bonding strength in coronal regions was achieved using 17% EDTA (40ºC).\u0000 \u0000How to cite this article:\u0000Öztekin F, Tekin S. Evaluation of the impact of different irrigation agents and temperatures on the bond strength of resin cement used in bonding fiber posts to dentin. J Med Dent Invest 2022;3:e221150. https://doi.org/10.5577/jomdi.e221150\u0000 \u0000Linguistic revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.\u0000 \u0000Checked for plagiarism: Yes","PeriodicalId":415108,"journal":{"name":"Journal of Medical and Dental Investigations","volume":"215 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123250116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of second mesiobuccal canal prevalence of maxillary molar teeth by gender and age in a Turkish subpopulation: A cone-beam computed tomography study","authors":"A. Akay, H. Öz, Özkan Adıgüzel, Seda Erkan Akay","doi":"10.5577/jomdi.e211062","DOIUrl":"https://doi.org/10.5577/jomdi.e211062","url":null,"abstract":"Aim: The purpose of this study is to examine the distribution of second mesiobuccal (MB2) canal frequency according to age and gender in the maxillary molars of individuals in South-eastern Anatolia, Turkey, using cone-beam computed tomography (CBCT). It also seeks to inform dentists who perform root canal treatments about the prevalence of additional canals that affect the success of treatments.\u0000Methods: 300 patients who had already had CBCT images taken were grouped by gender and age. A total of 1,034 maxillary molar teeth were evaluated in the axial section. The chi-square test was used to evaluate the morphological differences between different age groups and genders.\u0000Results: The total frequency of MB2 canals was found to be 44.4% in 300 people (42.5% in women; 47.2% in men). In addition, the frequency of MB2 canals was 59.2% (n = 506) in maxillary first molars and 30.4% (n = 528) in maxillary second molars. On the basis of the right and left jaws, the incidence of MB2 canals was 44.2% in the right jaw and 44.9% in the left jaw. No statistically significant differences were found between gender and age.\u0000Conclusion: It is concluded that using CBCT will increase the detection of the presence of additional canals, increasing dentists’ success rates in performing root canal treatments. Furthermore, it has been observed that using new technologies and spending more time in the detection of MB2 canals will increase the success of root canal treatments in maxillary molar teeth.\u0000 \u0000How to cite this article:\u0000Akay A, Öz H, Adıgüzel Ö, Erkan Akay S. Comparison of second mesiobuccal canal prevalence of maxillary molar teeth by gender and age in a Turkish subpopulation: A cone-beam computed tomography study. J Med Dent Invest 2021;2:e211062. https://doi.org/10.5577/jomdi.e211062\u0000 \u0000Linguistic revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.\u0000 \u0000Checked for plagiarism: Yes","PeriodicalId":415108,"journal":{"name":"Journal of Medical and Dental Investigations","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115648973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative evaluation of sterilization- and temperature-dependent cyclic fatigue resistance of four different nickel-titanium rotary file systems with reciprocal motion","authors":"Bayram Çelikel, Faruk Öztekin","doi":"10.5577/jomdi.e211038","DOIUrl":"https://doi.org/10.5577/jomdi.e211038","url":null,"abstract":"Aim: The aim of this study was to examine the effect of sterilization and temperature differences on the cyclic fatigue resistance of WaveOne Gold, Reciproc, Reciproc Blue, and Twisted File Adaptive rotary file systems.\u0000Methods: In total, 160 files and four file systems were used (n = 20). This study was carried out at two different temperatures: 20°C and 39°C. An artificial stainless-steel canal was used for the static cyclic fatigue test. The breaking times of the files were recorded and calculated by multiplying the number of revolutions by the rotational speed. The SPSS 22 program was used for statistical analysis. The Shapiro–Wilk test was used for data with a normal distribution. The Mann–Whitney U test was used for paired groups. The Kruskal–Wallis test was applied to groups with more than two variables where the data did not fit a normal distribution. Tukey’s post-hoc analysis was used to determine the source of differences. A value of p<0.05 was considered statistically significant.\u0000Results: When the lengths of the broken pieces and the numbers of breaks were compared at the two different temperatures, there was a significant difference between all the files. In addition, there was a significant between-group difference between the sterilized files and nonsterilized files (p < 0.05).\u0000Conclusion: The cyclic fatigue resistance of the Reciproc Blue file was higher than that of the other files. Low temperature increased cyclic fatigue resistance.\u0000 \u0000How to cite this article:\u0000Çelikel B, Öztekin F. Comparative evaluation of sterilization and temperature-dependent cyclic fatigue resistance of four different nickel-titanium rotary file systems with reciprocal movement. J Med Dent Invest 2021;2:e211038\u0000https://doi.org/10.5577/jomdi.e211038\u0000 \u0000Linguistic revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.\u0000 \u0000Checked for plagiarism: Yes","PeriodicalId":415108,"journal":{"name":"Journal of Medical and Dental Investigations","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125698085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}