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    3-Dimensional finite element analysis of stress distribution of dental implants on the bone tissue around the neck region of the implant and on the implant surface with respect to bone density
    (2020) Celebi Bektas, Adalet; Gulsun, Belgin
    Aim: The aim of this study was to investigate the maximum Von Misses stress values of implants with different diameters in patients with different bone densities depending on the forces that are applied with different angles to the bone around the implant neck and implant surface, by using finite element analysis method. Material and Methods: 3.8 mm and 4.6 mm diameter dental implants of an implant system that had an in vitro laser-microtextured neck design were used in this study. Computational models were generated for implants with different diameters which were placed in the maxillary and mandibular 1st molar teeth using flat and oblique (20° angled) abutments. Vertical and oblique (30° angled) forces of 300 N were applied to all models and the results were evaluated by finite element analysis.Results: The results show that both vertical and oblique forces on the implants and placement of abutments in the flat and oblique position caused tension in the bone around the neck of the implant and the implant surface. When the oblique and vertical loads applied to the bone models were compared, the forces applied in the oblique direction exhibited a significant increase of Von Misses stress values in the cortical bone around the crest module of the implant compared to the other group. In our study, the minimum stress distribution with respect to the direction of the applied forces and placement positions of the abutments was obtained by applying the implant and the force in the same direction (abutment straight, force vertical). However, in the groups with the angled application of the force direction and the angled placement position of the abutments, the maximum Von Misses stress value increased in the bone around the implant neck and implant surface.Conclusion: Placing the implants at the right angle and within bone tissues with adequate cortical bone density around the implant will ensure minimal stress values on both the supporting bone and the implant surface.
  • Küçük Resim Yok
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    Effects of Potentilla fulgens as a Prophylactic Agent in Tibial Defects in Rats
    (Sci Printers & Publ Inc, 2016) Koparal, Mahmut; Irtegun, Sevgi; Alan, Hilal; Deveci, Engin; Gulsun, Belgin; Seker, Ugur
    OBJECTIVE: To investigate the effects of Potentilla fulgens as a prophylactic agent on tibial defects in the rat. STUDY DESIGN: Twenty-eight male Wistar albino rats weighing 200-215 g each were divided into 3 experimental groups. The tibial bone defect group served as the control group. The experimental groups were Potentilla fulgens with tibial defect (14 days) and Potentilla fulgens with tibial defect (28 days). Extract of Potentilla fulgens was mixed with water (400 mg/kg/day) and given to groups 14 and 28 as drinking water. The histopathological and immunohistochemical characteristics of each tibial bone cavity within each group were observed. The trabecular new bone formation was evaluated by expression rate of osteonectin and osteopontin. RESULTS: In the Potentilla fulgens + tibial defect group (14 days), trabecular bone had started combining extensive new bone formation, osteocyte cells were evident, and lamellar bone was formed. Osteoblasts showed a positive reaction with osteonectin. Osteopontin expression was positively observed between fibrous structures and in the osteoblast and osteocyte cells. This can be considered indicative of new bone formation. In the Potentilla fulgens + tibial defect group (28 days), an increase in expansion in trabecular bone and myeloid tissue was observed. Osteoblastic activity and osteocyte cells began to be observed in new bone fragments. CONCLUSION: In our study we show that Potentilla fulgens extract provided a protective effect on new bone formation and aided in the development of osteocytes and secretion of matrix in osteoblasts. Additionally, we show the inductive effect of the extract on new bone formation. In particular, the expression of osteopontin and osteonectin was also supported with the Western blot technique on the development of osteoblasts and osteocytes, showing a similar trend with our results.
  • Küçük Resim Yok
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    WhatsApp messaging improves communication in an oral and maxillofacial surgery team
    (Elsevier Ireland Ltd, 2019) Koparal, Mahmut; Unsal, Haluk Yener; Alan, Hilal; Uckardes, Fatih; Gulsun, Belgin
    Objective: Smartphones have become very popular among oral and maxillofacial surgeons. WhatsApp is an application that enables users to send voice, text, and multimedia messages using the group communication feature. The purpose of this study was to evaluate the efficiency of WhatsApp messaging as a mode of consultation within an oral and maxillofacial surgery team. Materials and methods: A retrospective study on WhatsApp group conversations amongst oral and maxillofacial surgeons was performed between July 2015 and July 2016. A WhatsApp group consisting of senior and junior surgeons was created, and many consultations were recorded. Seven hundred fifty-six consultations were included in the study. In this study, the arrival and response times of messages, types of cases, timing of consultation's end, consultant locations, contents of multimedia messages, and the categories/types of messages were evaluated. During consultations, some cases were discussed with text messages via WhatsApp, and some cases with voice and image messages via WhatsApp, with or without WhatsApp text messages. In addition, several cases were discussed with video messages via WhatsApp. Thus, a total of 1747 messages reflecting four different message types were included in this study: 754 (43%) were text messages, 752 (43%) were photographic images, 213 (12%) were videos, and 28 (nearly 2%) were voice messages. Results: The most frequent consultations concerned impacted teeth (n = 363, 48.01%). Most consultations were resolved using WhatsApp (n = 306, 64.4%), and consultants were often not in the hospital during these consultations (n = 411, 54.3%). Most messages sent by consultants were conclusive (n = 306, 74.4%). Conclusion: We conclude that WhatsApp is a simple, free, and practical application, which allows efficient consultation when consultants are not in the hospital.