Yazar "Atil, Fethi" seçeneğine göre listele
Listeleniyor 1 - 16 / 16
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Allogenic versus Autogenous Bone Rings in Dental Implant Surgery: Guidance of Stress Analysis-Part II(Amer Scientific Publishers, 2018) Ozgul, Ozkan; Altay, Berkan; Atil, Fethi; Onder, M. Ercument; Tekin, Umut; Yilmaz, Seda; Kocyigit, Ismail DorukObjective The aim of this study is to compare the stress distribution along the alveolar bone following the allogenic and autogenous bone ring assisted immediate dental implant surgery using three dimensional finite element analyses Material and Methods Finite element models of maxilla and mandible that augmented with autogenous and allogenic bone ring graft with dental implant were created Vertical force of 100 N and oblique force of 100 N at 45(degrees) angle were applied to root formed design dental implant and abutment Results The highest calculated values of VonMisses (VM) stresses were observed in oblique loaded mandible model which augmented with allogenic graft In all models the highest VM stress values were greater for oblique loading compare to vertical loadings Allogenic bone ring grafts contribute the stresses more evenly through the implant, as for the autogenous grafts stresses are concentrated in the neck area of the implant Discussion Allogenic and autogenous grafts applied with implant placement create different stress distributions Stress distributions should be considered when choosing type of biomaterial.Öğe Biomimetic dental implant production using selective laser powder bed fusion melting: In-vitro results(Elsevier, 2024) Önder, M. Ercüment; Çulhaoğlu, Ahmet; Özgül, Özkan; Tekin, Umut; Atil, Fethi; Taze, Cem; Yasa, EvrenInstead of a textured surface with irregular pore size and distribution as in conventional dental implants, the use of lattice structures with regular geometric structure and controlled pore size produced by selective laser powder bed fusion melting (LPDF) technique will provide more predictable and successful results regarding osseointe- gration and mechanics. In this study, biomimetic dental implants with 2 different pore designs were fabricated by LPDF technique and compared with conventional dental implants in terms of surface characterization and resistance to biomechanical forces. Finite element analysis, scanning electron microscopy, computed micro to- mography scanning, ISO 14801 tests and detork tests were used for the comparison. The tested biomimetic implants were found to be as durable as conventional implants in terms of mechanical strength and detork values. They were also found to be 40-60% more advantageous than conventional dental implants with respect to surface area and volume. As a result, it was concluded that biomimetic dental implants with sufficient me- chanical strength and complex surface geometries can be made as designed without changing the reliable base material and can be produced using a different manufacturing method.Öğe Clinical Evaluation of the Use of Tibial Bone Grafting in Dentoalveolar Reconstructive Surgery(Karger, 2016) Atil, Fethi; Kocyigit, Ismail Doruk; Suer, Berkay Tolga; Alp, Yunus Emre; Yazan, Murude; Tekin, Umut; Tuz, Hakan H.Objective: The aim of this study was to evaluate the efficacy of tibial autogenous bone grafting in the treatment of patients with alveolar bone defects. Materials and Methods: The study subjects consisted of 12 patients (10 male, 2 female, age: 19-51 years) who underwent reconstructive autogenous bone-grafting procedures. The medial approach to the tibial bone was used to harvest autogenous cancellous bone grafts in all the patients. Clinical parameters (complications at the donor and recipient sites, resorption and volume of the grafts) were evaluated retrospectively. Results: The mean age of the patients was 36.25 +/- 0.9 years. Of the 12 patients, 5 (41.7%) received bone grafts for sinus augmentation, 3 (25%) for cyst cavity reconstruction and 4 (33.3%) for alveolar cleft reconstruction procedures. The average follow-up period was 28.4 months (range: 21-40 months). An average of 5.2 cm(3) of cancellous bone was harvested for grafting procedures. All the grafting procedures were successful, and there were no surgical complications during the harvesting protocol. In all cases, pain and gait disturbance lasted less than 2 weeks. Conclusion: The results of this study suggest that the use of tibial autogenous bone graft harvested using a medial approach was a safe, simple and effective method for grafting various alveolar bone defects where high amounts of cancellous bone grafts were needed with low morbidity. (C) 2015 S. Karger AG, BaselÖğe Correction of Postsurgical Alveolar Ridge Defect With Vertical Alveolar Distraction of the Onlay Block Graft(Lippincott Williams & Wilkins, 2012) Kocyigit, Ismail Doruk; Tuz, Hakan H.; Alp, Yunus Emre; Atil, Fethi; Tekin, Umut; Coskunses, Fatih MehmetAlveolar bone augmentation for dental implant rehabilitation is one of the greatest challenges for oral and maxillofacial surgeons. Bringing out an inadequate quantity of vertical bone during augmentation compromises correct implant positioning and the resulting prosthetic restoration. Alveolar distraction osteogenesis is now generally used in correcting alveolar ridge atrophy due to trauma, congenital defects, or periodontal defects. Onlay block grafting is a suitable method for restoring the alveolar bony defects. However, it sometimes can become a complicated procedure to repair the horizontal defect accompanying a vertical defect using only bone blocks. This clinical report presents a successful reconstruction of a severe anterior mandibular alveolar bony defect as a result of impacted teeth extraction and periodontal problem in a 50-year-old healthy female patient. The defect was reconstructed with symphysis graft and platelet-rich fibrin in the first step. Vertical alveolar distraction was performed on the grafted site to maintain the suitable bony height 3 months later. Grafted bony segment distraction and the treatment options in similar cases were also discussed in this clinical report among with the literature.Öğe Effect of Locally Administered Alendronate on Onlay Grafts(Amer Scientific Publishers, 2017) Tekin, Umut; Ozgul, Ozkan; Tuz, Hakan; Korkusuz, Petek; Kocyigit, Ismail Doruk; Atil, Fethi; Onder, M. ErcumentObjective: The present study compared the effects of local alendronate application on the osteogenesis of autogenous and xenogenous onlay grafts implanted in rabbit mandibles. Material and Methods: 28 New Zealand rabbits were used in this experimental animal study. The animals were randomly divided into 4 groups according to graft material as follows: D1: autogenous graft-saline; D2: 60% autogenous graft-40% alendronate D3: xenogenous bone graft-saline; D4: 60% xenogenous graft-40% alendronate. 3 histologic parameters were evaluated: the ratio of new bone formation to the total defect area, the active osteoblast-lined bone length, and the ratio of osteocyte-filled lacunae to total lacunae. At the same time, the grafted zones were evaluated using dual-energy X-ray absorptiometry (DEXA) and the Bone mineral density scores were measured. Results: The present study showed better results for the group receiving alendronate applied to autogenous graft when compared to other groups. Discussion: The administration of alendronate increases the resistance of autogenous graft; it may also enhance new bone formation and increase the viability of xenograft. Further animal studies supported with biomechanical tests are required prior to human studies.Öğe Effect of Systemic Oxytocin Administration on New Bone Formation and Distraction Rate in Rabbit Mandible(W B SAUNDERS CO-ELSEVIER INC, 2020) Altay, Berkan; Dede, Eda Ciftci; Ozgul, Ozkan; Atil, Fethi; Kocyigit, Ismail Doruk; Orhan, Kaan; Tekin, UmutPurpose: The main disadvantage of distraction osteogenesis is the prolonged treatment protocol. Recently, oxytocin (OT) has been found to have anabolic effects on bone metabolism. In this experimental study, the effects of OT on the mandibular distraction gap in rabbits at 2 different distraction rates were evaluated. Materials and Methods: This experimental study was conducted on 28 male New Zealand white rabbits. The animals were divided into 3 experimental groups and 1 control group. Group A (control group, n = 7) consisted of animals with distraction at a rate of 1 mm/day, and group B (n = 7) consisted of animals with a distraction rate of 2 mm/day; groups A and B received postoperative saline solution injection. Group C (n = 7) consisted of animals with distraction at a rate of 1 mm/day, and group D (n = 7) consisted of animals with a distraction rate of 2 mm/day; postoperative OT injection was performed in groups C and D. Results: Both histomorphologic and micro-computed tomography evaluations showed increased bone healing in the OT-treated groups. Conclusions: On the basis of the evaluation of both the histomorphometric and micro-computed tomographic data, systemic OT administration was found to increase new bone formation and bone healing with distraction osteogenesis. (C) 2020 American Association of Oral and Maxillofacial SurgeonsÖğe 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, UmutBisphosphonates 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.Öğe Efficacy of platelet rich fibrin in the reduction of the pain and swelling after impacted third molar surgery: Randomized multicenter split-mouth clinical trial(Biomed Central Ltd, 2015) Özgül, Özkan; Şenses, Fatma; Er, Nilay; Tekin, Umut; Tuz, Hakan Hifzi; Alkan, Alper; Atil, FethiBackground: Impacted third molar removal is a routine procedure in oral and maxillofacial surgery. Platelet-rich fibrin (PRF) is a second generation platelet concentration which is produced by simplified protocol. The aim of this study was to assess the effectiveness of PRF in the healing process by evaluating the changes in pain and swelling after third molar surgery. Methods: Fifty-six patients (23 male, 33 female) who provide the inclusion criteria were selected to participate in this study. The evaluation of the facial swelling was performed by using a horizontal and vertical guide. The pain was evaluated in the postoperative period using a visual analog scale (VAS) of 100 mm. Results: Horizontal and vertical measurements showed more swelling at the control side (without PRF) in 3th day postoperatively (p < 0.05). There were no statistically significant differences regarding pain among the groups. Conclusion: As a conclusion, PRF seems to be effectiveness on postoperative horizontal swelling after third molar surgery. PRF could be used on a routine basis after third molar extraction surgery.Öğe Evaluation of Advanced Platelet Rich Fibrin (A-PRF) on Bone Healing. Is It Better than Old Version? A Histological Animal Study(Amer Scientific Publishers, 2017) Titirinli, Kubra; Tekin, Umut; Atil, Fethi; Onder, M. Ercument; Senguven, Burcu; Ozgul, Ozkan; Kocyigit, Ismail DorukObjective: This study aims to evaluate the effect of fibrin, which is formed with an alteration to the standard PRF centrifugation protocol, on the bone formation. The study additionally aims to assess cell-distribution, and to evaluate the effects of alterations in the speed and duration of centrifugation on the changes in cell-distribution and the formation of hard tissue, by making histological investigations. Materials and methods: Ten New Zealand rabbits were used in this experimental animal study. PRF (2700 rpm, 12 min) and APRF (1500 rpm, 14 min) were placed in the standard bone defects that formed in the right corpus of the mandible randomly. No additional material was placed in the left mandible defect, as a control group. Rabbits were sacrificed after two months, the histological evaluation was performed. Results: There were no marked differences between groups in regard to the quantity of bone formation and bone quality. The quantities of new bone formation were (mean) 56.9%, 55%, 42.5%. Discussion: It may be considered that PRF and its variations have positive effects on the new bone tissue and cell number, and may lead to more rapid ossification compared to the unprocessed bone defects.Öğe Evaluation of volumetric measurements on CBCT images using stafne bone cavities as an example(Medicina Oral S L, 2015) Adisen, Mehmet-Zahit; Yilmaz, Selmi; Misirlioglu, Melda; Atil, FethiBackground: 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 measurements.Öğe Oral rehabilitation with implant-supported fixed dental prostheses of a patient with cleidocranial dysplasia(Mosby-Elsevier, 2018) Atil, Fethi; Culhaoglu, Ahmet; Kocyigit, Ismail Doruk; Adisen, Zahit; Misirlioglu, Melda; Yilmaz, BurakThis clinical report describes the oral rehabilitation with implant-supported fixed dental prostheses in the maxilla and mandible of a patient with cleidocranial dysplasia. Cone-beam computed tomography and a tilted implant protocol in the mandible helped to establish a conservative approach for bone preservation, prevent surgical complications, enable proper implant positioning to avoid anatomic structures, and support the fixed dental prostheses.Öğe Piezosurgery Versus Conventional Surgery in Radicular Cyst Enucleation(Lippincott Williams & Wilkins, 2012) Kocyigit, Ismail Doruk; Atil, Fethi; Alp, Yunus Emre; Tekin, Umut; Tuz, Hakan H.Objective: This study compared the use of piezosurgery and conventional surgery in radicular cyst enucleation. Study Design: The study was conducted with 29 patients who were radiologically and cytologically prediagnosed with radicular cysts in the jaw region. Nineteen patients were treated using piezosurgery, and 10 were treated using conventional surgical procedures. Surgical procedures were evaluated according to the following criteria: hemorrhage, soft-tissue damage, manipulation complexity, major perforation areas on the enucleated cyst tissue, and approximate operation duration. Patients were monitored postoperatively and evaluated for hemorrhaging at 24, 48, and 72 hours following surgery. Follow-up was conducted to check for recurrences and ranged from 5 to 24 months. Results: No complications were observed in any of the 20 patients treated using piezosurgery, although the duration of surgery was longer than expected. Of the 10 patients treated using conventional methods, hemorrhaging that affected the operation occurred in 3 cases, perforation of the cyst epithelium and difficulties in enucleation occurred in 5 cases, postoperative hemorrhage occurred in 2 cases, and recurrence was observed in 2 cases. Conclusions: Piezosurgery may be considered effective in procedures such as enucleation that require sensitive manipulation, despite the increase in the length of the overall surgical procedure. Given the results of the present study and the current lack of information in the literature regarding postoperative pain, infection, and long-term success rates associated with the use of piezosurgery in cyst enucleation, further study in this area is recommended.Öğe Spontaneous Healing of Mandibular Noncontinuous Defect Caused by Medication-Related Osteonecrosis of the Jaw(Lippincott Williams & Wilkins, 2016) Yazan, Murude; Atil, Fethi; Kocyigit, Ismail Doruk; Tekin, Umut; Tuz, Hakan Hifzi; Misirlioglu, MeldaBackground: Bisphosphonates are used throughout supportive cancer therapies for the treatment of osteoporosis and metastatic bone diseases, but they invariably induce medication-related osteonecrosis of the jaw (MRONJ). This medicational modality may induce consequential losses that can lead to spontaneous or surgical therapy related bone fractures or defects. MRONJ stages and treatment alternatives are described in the current procedures. Accordingly, treatments for stages 0 and 1 are conservative whereas the treatment for stage 3 is surgical resection of the necrotic bone. Stage III MRONJ therapy is still controversial within the scope of conceivable bone fractures or defects. When the development of MRONJ is refractory to conventional treatment modalities, surgical management can be suggested. The aim of this study was to evaluate the results of the surgical treatment of MRONJ as part of a medical patient. Methods: A 72-year-old man was referred to our department for extensive pain of the left mandibular region that occurred after tooth extraction. It was identified in his medical history that he had received a nitrogen-containing intravenous bisphosphonate (Zometa; Novartis, East Hanover, NJ) therapy for prostate cancer. He had been administered 4 mg. IV Zolenat 9 times during the first year of therapy, followed by 2 doses of the same amount of Zolenat in the second year. Results: The treatment started with a therapy that combined antibiotics and antibacterial mouth rinse with chlorhexidine for maintaining oral hygiene. After the maturity of the sequestrum was identified through radiographic examination, the patient was treated by the segmental resection of the extensive necrotic bone, resulting in discontinuity of the mandibular corpus. Two years later, spontaneous bone healing occurred along the residual defect on the mandible. Conclusion: Treatment options for the defects resulting from MRONJ are still under debate, and no evidence-based guidelines are available. However, due to the results displayed in this patient; it may be a sound approach to closely follow up and observe MRONJ-related bone to prevent additional complications.Öğe Stafne Bone Cavity Complicated By Periapical Infection(Coll Physicians & Surgeons Pakistan, 2016) Atil, Fethi; Adisen, Mehmet Zahit; Misirlioglu, Melda; Suer, Berkay TolgaStafne bone cavity (SBC) is an uncommon lesion of the mandible; and generally found incidentally on routine radiographic examinations. The radiographic differential diagnosis of SBC includes a variety of lesions including odontogenic cysts, benign tumors, or bone metastases. In the present case, a 22-year female patient was admitted with chief complaint of pain in the right mandibular molar area. On panoramic radiographic examination, a non-specific large radiolucent lesion related to mandibular molar teeth was detected and extra-oral surgical intervention was planned. However, on examination with cone-beam CT (CBCT), a SBC was suspected due to lack of lingual cortical plate; and intraoral surgical exploration confirmed the diagnosis showing a cavity with small inflamed salivary gland tissue. Examination with CBCT on suspicious jaw lesions helps avoid unnecessary extraoral surgical interventions.Öğe Stress Analysis of Prostheses Retained with Zygomatic Implants on Augmented and Non-Augmented Maxillary Sinus(AMER SCIENTIFIC PUBLISHERS, 2020) Güngör, Hamiyet; Kaman, Süleyman; Özgül, Özkan; Önder, Ercüment Mustafa; Atil, Fethi; Tekin, Umut Saraçoğlu; Koçyiğit, İsmail DorukZygomatic implants for toothless, atrophic posterior maxilla are effective treatment options and it is known that graft use has a positive effect on the zygomatic implant stability with this treatment option. The aim of this study was to evaluate the stress values and their distribution at zygomatic implant-supported prosthetic infrastructure in augmented and non-augmented models. In this study, the three-dimensional finite element method was used and 2 zygomatic implants (47.5 x 4.0 mm), 2 conventional implants (13 x 3.75 mm) and atrophic maxilla with augmented and non-augmented maxillary sinus with prosthetic infrastructure, were modelled. A vertical load of 150 N was applied onto the maxillary model at 4 different regions (#9, #12, #14 and #15). The von Mises stress, which is produced as a result of loading of zygomatic implants and prosthetic infrastructure has been evaluated in augmented and non-augmented models. The highest von Mises stress value for the prosthetic infrastructure was determined in the non-augmented model as a result of the loading to region #9 (MPa 222,886). Consequently, grafting procedures will increase bone support and reduce stresses in the prosthetic substructure, especially in posterior loads in the maxilla with low bone density.Öğe 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 DorukPurpose: 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.
