Impact of internet supported dental education: Initial outcomes in a study sample

The aim of this preliminary mixed method study was to understand dental students’ thoughts on internet supported learning environment (ISLE) and to investigate its’ impact on their academic success. The research was designed to enroll the students from the 7th semester of School of Dentistry. The lecturer taught dental students for four hours (within four weeks) on the topics of "anamnesis, extraoral and intraoral examination". Voluntary twenty-four students participated actively to the ISLE. During the evaluation phase, data were collected by using open-ended questionnaire, instructor’s observation, students’ evaluation forms and exam results. According to the Open-ended questionnaire, 90% of the participating students mentioned e-learning experience positively affected their success; 55% of the students stated that dental courses can be taught online. According to students’ evaluation form, the highest mean score was granted to the instructor of the course (4.6/5), followed by the learning environment (4.1/5) and the materials (3.7/5). There was a significant difference between the grades granted to the instructor and materials; students thought the instructor was more important than the teaching materials (p<0.05). It was concluded that ISLE supported by PBL increased the students’ satisfaction, positive learning environment and academic success

The Effect of Root Canal Preparation Size and Taper of Middle Mesial Canals on Fracture Resistance of the Mandibular Molar Teeth: An In Vitro Study

Introduction: The aim of the present study was to investigate the influence of root canal preparation size and taper of middle mesial (MM) canals on fracture resistance of mandibular molars. Methods: Fifty-five mandibular molar teeth having an MM canal were selected based on the cone-beam computed tomographic analysis. After the decoronation and distal root separation procedure, the lengths of the mesial roots were standardized to 13 mm. The specimens were randomly distributed into 5 groups (n = 11). Mesiobuccal and mesiolingual canals were prepared up to size 30.06 using VDW.ROTATE rotary files (VDW, Munich, Germany). The MM canal was prepared up to size 25.04, 25.06, 30.04, and 30.06, respectively. No preparation was done in the MM canal in the control group. After the irrigation protocol, the canals were obturated with the single-cone technique. A thin layer of silicone coated specimens was embedded in acrylic resin and subjected to a fracture strength test by a universal testing machine. A vertical force was applied to the roots until they fracture. Statistical analysis was performed with 1-way analysis of variance and post hoc Duncan tests (P = .05). Results: There was no significant difference between group 25.04 and the control group, but the fracture strengths of these groups were found to be significantly higher than that of groups 25.06, 30.04, and 30.06 (P , .05). Conclusions: Within the limitations of this study, we concluded that increasing the apical diameter and taper in the MM canal reduces the fracture strength of mandibular molar teeth. Among the tested instrumentation sizes, fracture strength decreased significantly when greater than 25.04 instrumentation sizes were chosen. (J Endod 2021;47:1467-1471.

Extra-Short Implants with Osteotome Sinus Floor Elevation: A Prospective Clinical Study

WOS: 000519127500022PubMed: 32142579Purpose: the aim of this study was to assess the radiographic and clinical outcomes of extra-short implants either alone or in conjunction with osteotome sinus floor elevation and to compare these with regular-sized implants in the posterior atrophic maxilla. Materials and Methods: Systemically healthy, nonsmoker individuals having at least one tooth gap in the posterior maxilla were included in the study. When the residual bone height was .05). Conclusion: Extra-short implants placed either in native bone or in conjunction with osteotome sinus floor elevation may provide similar clinical and radiographic outcomes that are comparable to those obtained with regular implants. Both extra-short implant placement methods can be promising noninvasive treatment options for the posterior maxilla, and implant dimension, crown length, crown-to-implant ratio, and residual bone height may not affect the crestal bone level change, at least in the short term

Farklı post materyallerinin radyoopasitelerinin değerlendirilmesi

Amaç: Dört farklı post materyalinin radyoopasitelerinin karşılaştırılmalı olarak değerlendirilmesidir. Gereç ve Yöntem: Farklı üreticilere (CosmoPost (Ivoclar Vivadent, Leicester, İngiltere), Unicore (Ultradent, Salt Lake City, CA, ABD), D.T.Light-Post (Bisco Inc, Schaumburg, IL ABD), FRC Postec Post (Ivoclar Vivadent, Schaan, Liechtenstein) ait postlardan, düşük hızda dönen elmas separe yardımıyla 2 mm kalınlığında sekizer tane örnek elde edildi. Örnekler dörderli gruplar halinde %99 saflıkta alüminyum step wedge ile birlikte fosfor plak üzerinde konumlandırıldı ve standart dijital radyografiler alındı. TIFF formatında kaydedilen görüntüler, görüntü analiz programıyla değerlendirildi ve her örneğin ortalama grilik değerleri tespit edildi. Veriler tek yönlü varyans analizi ve Tukey çoklu karşılaştırma testleri kullanılarak olarak analiz edildi (p=0,05). Bulgular: En yüksek radyoopasite değeri Cosmopost (7,37±0,17 mm Al) için saptandı. Bu materyali sırasıyla Unicore (4,3±0,26 mmAl), D.T.Light-Post (2,11±0,1 mmAl) ve FRC Postec (1,72±0,24 mmAl) izledi (p<0,001). Sonuçlar: FRC Postec, D.T.Light Post ve Unicore post materyallerinin tümü fiber esaslı olmakla birlikte radyoopasite değerleri birbirinden farklı bulunmuştur ve bu sonuçlar literatürle uyumludur. Zirkonyum dioksit içerikli Cosmopost ise oldukça yüksek radyoopasite değeri sergilemiştir. Elde edilen sonuçların klinik çalışmalarla irdelenmesinin faydalı olacağını kanısındayız.Objectives: The aim of this study was to evaluate the radiopacity of four different types of post materials by using a digital image analysis method. Materials and Methods: Various brands of four post systems CosmoPost (Ivoclar Vivadent, Leicester, UK), Unicore (Ultradent, Salt Lake City, CA, USA), D.T.Light-Post (Bisco Inc, Schaumburg, IL, USA), FRC Postec (Ivoclar Vivadent, Schaan, Liechtenstein) were used for the study. Eight specimens from each post type of 2 mm in thickness were obtained using a diamond blade mounted on a cutting machine. Eight digital radiographs of the specimens and 99% pure aluminium (Al) step wedge (SW) were acquired under standard exposure conditions. The mean gray values of each specimen and Al-SW were measured using a digital imaging software. Data were analyzed using one-way ANOVA and post-hoc Tukey tests (p=0.05). Results: The highest opacity was observed for Cosmopost (7.37&plusmn;0.17 mmAl), which was followed by Unicore (4.3&plusmn;0.26 mmAl), D.T.Light-Post (2.11&plusmn;0.1 mmAl), and FRC Postec (1.72&plusmn;0.24 mmAl), respectively (p&lt;0.001). Conclusions: Even though all three post materials are based on fiber, the radiopacity values of FRC Postec, D.T.Light Post and Unicore were different from each other; this was concordant with the literature. Zirconium dioxide containing Cosmopost revealed the highest radioopacity. These findings shall be further evaluated and confirmed by clinical investigations in order to provide more substantial decision

Cyclic Fatigue Resistance of Novel Glide Path Instruments with Different Alloy Properties and Kinematics

WOS: 000444527700014PubMed ID: 30049469Introduction: The aim of the present study was to evaluate the cyclic fatigue resistance of the WaveOne Gold Glider (Dentsply Maillefer, Ballaigues, Switzerland), R-Pilot (VDW, Munich, Germany), and ProGlider (Dents ply Maillefer) glide path instruments. Methods: Ten instruments from each glide path system were included in the study. A stainless steel artificial canal with a 90 angle and a 3-mm radius of curvature was used for the testing process. The working lengths of the instruments were fixed at 19 mm, and the instruments were operated using an endodontic motor (X-Smart Plus, Dentsply Maillefer) at recommended setting for each. A digital camera (Sony HDR-XR260; Sony Corporation, Minato, Tokyo, Japan) was positioned on the top of the cyclic fatigue test device, and the time to fracture was recorded in seconds by means of the video camera. For each instrument, the number of cycles to failure was calculated, and the length of the fractured fragment was measured. The data were analyzed using 1-way analysis of variance followed by the post hoc Tukey test. Results: Statistically significant differences in the number of cycles to failure values were observed across the tested groups; the ranking of the instruments was as follows: WaveOne Gold Glider > R Pilot > ProGlider (P .05). Conclusions: Within the limitations of the present study, it can be concluded that improved alloy properties and reciprocating motion could enhance the cyclic fatigue resistance of glide path instruments

A sustainable, self-sufficient peer review algorithm for health-related YouTube videos: A proposal

YouTube has recently become one of the major sources of information in the field of health. Not only healthcare professionals but also laypersons can upload videos to YouTube and this fact creates a significant heterogeneity in the content, viewpoint, and accuracy of the available videos. Particularly, those videos presenting personal experiences and inferences on health problems may not rely on scientific evidence thus create inaccurate information. This commentary aims to propose an algorithm to improve the accuracy and reliability of health-related YouTube videos