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Öğe Comparison of the effects of different loading locations on stresses transferred to straight and angled implant-supported zirconia frameworks: a finite element method study(Taylor & Francis Ltd, 2015) Guven, Sedat; Atalay, Yusuf; Asutay, Fatih; Ucan, Musa Can; Dundar, Serkan; Karaman, Tahir; Gunes, NedimThe paper presents three-dimensional (3D) finite element models of straight and angled implants and their zirconium-based superstructures. The key objective was to compare the influence of different loading conditions on the stress distribution of straight and angled implants and the zirconia frameworks. 3D finite element straight- and angled-implant models of a mandibular section of bone with missing second molars and their zirconium-based superstructures were used. The straight and angled implants were 4.7 x 13-mm screw-type dental implant systems. Total loads of 300 N were applied in a vertical direction and in an oblique (30 degrees to the vertical) direction buccolingually. Maximum and minimum von Mises stress values of the titanium structures (abutment and implant body) and zirconia frameworks were calculated. When the two groups were examined, the highest stress value was in the zirconia framework of the angled implant-supported model with an oblique loading force (731.46 MPa). The lowest stress values were concentrated in the straight implant-supported model. Thus, the stress values in the angled implant-supported crown were higher than those in the straight implant-supported model. Stress values with oblique loading forces were higher than the values with vertical loading forces. The highest stress value in the zirconia framework was similar to the ultimate strength of the zirconia.Öğe Effects of Systemic Zoledronic Acid Administration on Osseointegration of Hydroxyapatite-Coated and Resorbable Blast Material Surface Implants in Rabbit Models(Quintessence Publishing Co Inc, 2012) Yaman, Ferhan; Agacayak, Serkan; Atilgan, Serhat; Benlidayi, Emre; Ucan, Musa Can; Erol, Behcet; Kaya, BeyzaPurpose: It is unknown whether zoledronic acid (ZA) interferes with initial bone healing at implant sites. The goal of this study was to examine the effects of systemic zoledronic acid administration on osseintegration of hydroxyapatite (HA)-coated and resorbable blast material surface (RBM) implants in rabbit models. Materials and Methods: Twenty-eight male New Zealand rabbits (aged 6 to 12 months) were used in this study. Rabbits were randomly assigned to four groups. In group A, HA-coated implants were placed in the right tibia of seven rabbits. In group B, RBM-surface implants were placed in the right tibia of seven rabbits. In group C, HA-coated implants were placed in seven rabbits with intravenous (IV) administration of ZA. Finally, in group D. ROM-surface implants were placed in seven rabbits with IV administration of ZA. For groups C and D, IV zoledronic acid (0.1 mg/kg) was performed monthly during the entire osseointegration period. All of the rabbits were sacrificed 12 weeks after the implantation, and tibial specimens were harvested. Histomorphometric bone-to-implant contact (BIC) analysis and the data were statistically analyzed. Results: The highest BIC percentage was detected in group D, with a mean value of 56.73% +/- 1.85%, as compared with 45.80% +/- 3.77% in group C, 35.11% +/- 0.76% in group B, and 3114% +/- 1.04% in group A. Conclusions: Histomorphometric analyses showed significant improvement in the osseointegration of implants in the RBM-surface ZA group compared with the HA-coated ZA group. The results of this study suggest that systemic ZA administration may improve osseointegration of titanium implants in bone. INT J ORAL MAXILLOFAC IMPLANTS 2012;27:1443-1447Öğe Evaluation of Mandibular Fractures in Children during Five years' in a Dental School(Drunpp-Sarajevo, 2012) Yaman, Ferhan; Atilgan, Serhat; Erol, Behcet; Ucan, Musa Can; Yilmaz, Utku Nezih; Agacayak, Serkan Kamil; Gunes, NedimMandibular fractures are rarely encountered among the pediatric population, and when they do present, their clinical features differ from those in adults. This retrospective study looked at the age, sex, type and cause of fracture, treatment method and associated injuries and complications in 260 cases of mandibular fracture in children under age 16. Among the most significant findings: Fracture incidence had a 3:5 male:female ratio; 52% of all mandibular fractures involved condyle/subcondyle fractures and 50.7% involved symphysis/parasymphysis fractures; the most common treatment method was intermaxillary fixation; in no cases were severe complications observed during the healing period.Öğe Evaluation of retrograde intubation in patients with limited mouth opening(Springer Japan Kk, 2013) Tufek, Adnan; Ucan, Musa Can; Tokgoz, Orhan; Celik, Feyzi; Agacayak, Serkan[Abstract Not Available]Öğe Examination of stress distribution and fracture resistance in five-unit tooth- nd implant-supported partial fixed zirconia prosthesis(Taylor & Francis Ltd, 2015) Guven, Sedat; Aguloglu, Suleyman; Beydemir, Koksal; Dundar, Serkan; Atalay, Yusuf; Ucan, Musa Can; Asutay, FatihIn this study, stress distribution and fracture strength values of zirconia frameworks were compared in five-unit tooth- and implant-supported fixed zirconia prosthesis. Three-dimensional finite element stress analysis and static non-linear analysis were used. Because of the boundary conditions determined for these methods, the tooth- and implant-supported models only included the regions of tooth numbers 43-47. The highest stress value (901.845 MPa) was measured in Model 1 (five-unit tooth-supported fixed zirconia bridge) at the mesial gingival neck area of restoration number 45. This stress value was within the ultimate strength of zirconia (900-1200 MPa). Stress values for connector regions were not in the ultimate strength value of zirconia. Stress values in the tooth-supported fixed zirconia bridge were more than the values in the implant-supported fixed zirconia bridge. The highest stresses in Model 2 (five-unit implant-supported fixed zirconia bridge) occurred in the restoration that the model was installed on. The obtained results showed that five-unit tooth-supported posterior zirconia fixed bridge prostheses are not recommended and that the second premolar region is most seriously affected in terms of stress.Öğe Mandibular fractures: a comparative analysis between young and adult patients in the southeast region of Turkey(Univ Sao Paulo Fac Odontologia Bauru, 2010) Atilgan, Serhat; Erol, Behcet; Yaman, Ferhan; Yilmaz, Nezih; Ucan, Musa CanObjective: The purpose of this study was to review and compare the differences between mandibular fractures in young and adult patients. Material and Methods: Patients treated at the Oral and Maxillofacial Department of Dicle University during a five-year period between 2000 and 2005 were retrospectively evaluated with respect to age groups, gender, etiology, localization and type of fractures, treatment methods and complications. Result: 532 patients were included in the study, 370 (70%) males and 162 (30%) females, with a total of 744 mandibular fractures. The mean age of young patients was 10, with a male-female ratio of 2:1. The mean age of adult patients was 28, with a male-female ratio of 3: 1. The most common causes of injury were falls (65%) in young patients and traffic accidents (38%) in adults. The most common fracture sites were the symphysis (35%) and condyle (36%) in young patients, and the symphysis in adults (36%). Mandibular fractures were generally treated by arch bar and maxillomandibular fixation in both young (67%) and adult (39%) patients, and 43% of the adult patients were treated by open reduction and internal fixation. Conclusion: There was a similar gender, monthly and type of treatment distribution in both young and adult patients in the southeast region of Turkey. However, there were differences regarding age, etiology and fracture site. These findings between young and adult patients are broadly similar to those from other studies. Analysis of small differences may be an important factor in assessing educational and socioeconomic environments.Öğe Maxillar adenocystic carcinomas and surgical-prosthetic rehabilitation(Int Scientific Literature, Inc, 2011) Erol, Behcet; Atilgan, Serahim Serhat; Yaman, Ferhan; Ucan, Musa Can; Yilmaz, Utku Nezih; Yildiz, FetinBackground: Due to its microscopic appearance, characteristic clinical behavior, high level of recurrence and systemic spread, adenocystic carcinoma is considered as separate from other forms of glandular neoplasm. In terms of clinical behavior, it is the most deceptive tumor in the head-neck region. It most commonly involves the parotid, submandibular gland, tongue and accessory salivary glands in the palate. The clinical appearance is of a mass with hardness at palpitation and sometimes pain or sensitivity. Postoperative prosthetic defect rehabilitation is functionally and phonetically essential. Case Report: The first patient was a 50-year-old woman with a painful swelling in the right maxillary molar and palatal region, which had persisted for the previous year and grown rapidly during the previous 2 months, and with congestion in the right side of the nose. The second patient was a 36-year-old woman complaining of swelling in the left cheek 1.5 years previously and an inability to open her mouth 5-6 months before application to our clinic, a solid mass, painful on palpitation, causing facial asymmetry along the left cheek and limiting mouth opening. Conclusions: Our aim is to present and discuss surgical approaches adopted in cases reported as adenocystic carcinoma, which occupies a special place among malign salivary gland tumors, the first case involving the maxillary dentoalveolar structure and maxillary sinus, and the second case involving the buccal, retromaxillary, infratemporal and pterygomandibular fossa.Öğe Myiasis Caused by Musca domestica Larvae in a Child: A Case Study(Medwell Online, 2011) Ucan, Musa Can; Erol, Behcet; Balacan, Fatma; Atilgan, Serhat; Yaman, Ferhan; Arslanoglu, Zeki; Agacayak, Serkan KamilThe term myiasis is the infestation of tissue by the larvae of flies. This parasitic infestation is well documented in the skin, especially among animals and people in tropical and subtropical zones. Among the sites of infestation, the human mouth is a common site mainly in tropical countries and is associated with inadequate public and personal hygiene. Due to its destructive potential, appropriate treatment is necessary. This study describes oral myiasis in an 8 years old boy who lives relatively warmer area of his country. The myiasis occurred in the anterior upper jaw associated with palatal area of left incisor and lateral tooth. Pathologic soft tissue sockets were observed in the palatal area at the level of the both deciduous incisor and lateral along the deep periodontal tissues.Öğe Three-dimensional finite-element analysis of a single implant-supported zirconia framework and its effect on stress distribution in D4 (maxilla) and D2 (mandible) bone quality(Taylor & Francis Ltd, 2015) Guven, Sedat; Demirci, Fatih; Yavuz, Izzet; Atalay, Yusuf; Ucan, Musa Can; Asutay, Fatih; Altintas, EyyupThe aim of this in-silico study was to compare stress distributions in implants and zirconia frameworks of mandibular and maxillary implant-supported crowns. For comparison, vertical and oblique loading forces were used. Three-dimensional finite-element implant models of a mandibular section of bone (D2) and a maxillary section of bone (D4) with missing second molars and their zirconium-based superstructures were used. Zimmer dental implants of 13 mm in length and 4.7 mm in diameter were modelled. A load of 200 N was applied toward vertical and oblique (30 degrees to the vertical) directions. Maximum and minimum von Mises stress values of the implants and the zirconia framework were calculated. The highest stress value was concentrated in the zirconia framework of the maxillary implant-supported model with the oblique loading force (301.17 MPa). The lowest stress value was concentrated in the mandibular implant-supported model. And the stress values in the maxilla were higher than in the mandible. The maxilla (D4) showed higher stress values than in the mandible (D2), because the trabecular bone is weaker and less resistant to deformation than the cortical bone. Stress values with oblique loading forces were higher than with vertical loading forces. Because of the high Young's modulus of zirconia (low elastic properties), zirconia frameworks showed higher stress values than the implants.
