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    Comparison of Different Fixation Types Used in Unilateral Mandibular Condylar Fractures: An In Vivo Study With New Biomechanical Model
    (Lippincott Williams & Wilkins, 2016) Cimen, Emre; Onder, Mustafa Ercument; Cambazoglu, Mine; Birant, Emir
    Introduction: The aim of this in vivo study is to compare the single-titanium, double-titanium mini plate, and single resorbable plate systems used in internal rigid fixation of the unilateral mandibular condylar fractures on new design biomechanical model. Methods: Thirty synthetic polyurethane models were used for biomechanical testing. Fracture lines were created for each model. Fragments were fixed with single-titanium plates in Group A (n = 10), double-titanium plates in Group B (n = 10), and single biodegradable plate (PPLA) in Group C (n = 10). Masticatory forces were applied to the models and the biomechanical properties of the titanium plate and screws, resorbable plate, and screws were evaluated. Results: The average failure force for Group A, Group B, and Group C is 199, 324, 177N and the average bone displacement for Group A, Group B, Group C is 1.9, 0.3, 2.1 mm, respectively. Discussion: Double titanium plates showed the most acceptable results in the fixation of unilateral subcondylar fractures where the single titanium and biodegradable plate systems failed to provide enough stability in unilateral subcondylar fracture fixation. Biodegradable plate systems are still not an alternative in fixation of unilateral condylar fractures.
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    Effects of Local Low-Dose Alendronate Injections Into the Distraction Gap on New Bone Formation and Distraction Rate on Distraction Osteogenesis
    (Lippincott Williams & Wilkins, 2017) Alp, Yunus Emre; Taskaldiran, Alper; Onder, Mustafa Ercument; Karahan, Siyami; Kocyigit, Ismail Doruk; Atil, Fethi; Tekin, Umut
    Bisphosphonates that constrain bone resorption have a direct effect on osteoclast function. In this experimental study, the effects of low-dose local alendronate injections on the distraction gap (DG) in rabbit mandible at 2 different rates were evaluated. The experimental study was conducted on 20 male, New Zealand white rabbits. The animals were divided into 3 experimental groups and 1 control group. Group 1 consisted of animals with distraction at the rate of 1 mm/day, receiving postoperative local low-dose alendronate local injections into the DG. Group 2 consisted of animals with distraction at the rate of 2 mm/day, receiving postoperative 0.75 mu g/kg of alendronate local injections into the DG. Group 3 consisted of animals with distraction at the rate of 2 mm/day, receiving postoperative 0.2 mL local saline injections into the DG. Group 4 consisted of animals with distraction at the rate of 1 mm/day, receiving postoperative 0.2 mL local saline injections into the DG. All the injections were performed immediately postoperatively and for all groups at 1, 2, 3, and 4 weeks following surgery. The distraction zones were evaluated using dual-energy X-ray absorptiometry and histological analysis. Histologically, bone healing was found to be significantly accelerated in Groups 1 and 4 compared with Groups 2 and 3 (P<0.05). Bone healing was superior in Group 1 and the difference was statistically significant compared with Group 4. There was a significant increase in mean bone mineral density in the 1 mm daily rate groups (Groups 1 and 4) compared with the 2 mm daily rate groups (Groups 2 and 3) (P<0.05). Local low-dose alendronate injections could be an effective way for improving bone formation in distraction osteogenesis. Furthermore, the results of this study did not support the hypothesis that injections of local low-dose alendronate may allow 2 mm/day instead of 1 mm/day of elongation in the rabbit mandible.
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    Is YouTube® Adequate as a Source of Patient Information for Intravenous Sedation in Dentistry?
    (Routledge Journals, Taylor & Francis Ltd, 2022) Erkan, Gozde Nur; Onder, Mustafa Ercument
    Objective: According to the results of the research conducted by the Pew Research Center in the USA, 80% of adult Internet users search for health on the Internet, and treatment decisions of 58% of them are affected by the information obtained. YouTube (R) is the most popular video-sharing platform globally, and many health-related videos are available. However, the information quality of YouTube (R) videos on intravenous sedation in dentistry is unclear. This study aimed to evaluate the information quality of YouTube (R) videos on Intravenous sedation in dentistry. Materials and methods: Intravenous sedation in dentistry was searched on YouTube (R), and the first 200 videos were listed. Video features, i.e., like ratio (LR) and video power index (VPI), were recorded. The quality of videos was evaluated using the DISCERN questionnaire, Global Quality Score (GQS), and Journal of the American Medical Association (JAMA) score. Results: The study included 130 videos, and 73.1% of the videos were published by private dental hospitals. However, 96.9% of the videos were of low quality considering the DISCERN total score. Only 14.6% of the videos with GQS and 1.5% with JAMA were of acceptable quality (score >= 3). Videos with Fair DISCERN total score and the DQ score of 4 had significantly higher VPI, view ratio, and number of comments. The VPI and view ratio were significantly higher in videos with a GQS score of 4. Moreover, the video quality was positively correlated with the video duration. Conclusion: YouTube (R) content about intravenous sedation in dentistry was generally of low quality. It has been demonstrated that users viewed higher quality videos more and higher quality videos were more popular about IV sedation in dentistry. Thus, patients could be informed effectively and adequately by uploading accurate and quality YouTube (R) videos created by authorized institutions, anesthesiologists, and dentists.
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    Stress Analysis of Zygomatic Implants on the Augmented Maxillary Sinus: Is It Necessary to Graft?
    (Lippincott Williams & Wilkins, 2017) Kaman, Suleyman; Atil, Fethi; Tekin, Umut; Ozgul, Ozkan; Onder, Mustafa Ercument; Yilmaz, Seda; Kocyigit, Ismail Doruk
    Purpose: Zygomatic implants are becoming an ideal therapy with advanced implant-supported prosthetic treatment for the posterior atrophic maxilla. The purpose of this study is to examine the quantity and distribution of stress, which was caused by zygomatic implants placed using intrasinus method with or without augmentation to the atrophic posterior maxilla. Materials & Methods: In this study, 3-dimensional atrophic edentulous maxilla models with and without sinus augmentation are designed with computer-aided programs. Stress analysis was carried out on the created computer models for maxillary alveolar cortical bone, for cortical bone in the zygomaticomaxillary suture, and for zygomatic spongy bone at the apex of the zygomatic implant and for metal substructure of Von Misses stress data. Results: Having augmented the maxillary sinus with graft, it was observed that after the loading especially in the posterior region, the tensile and compressive stresses on the alveolar crest was distributed more homogeneously and the stress generated on the cortical bone was reduced through the graft. Conclusion: Although zygomatic implants are graftless solutions for athrophic maxilla, sinus augmentation will be useful for bearing stress around the implants.