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Öğe Complex Midfacial Reconstruction With an Implant-Supported Framework(LIPPINCOTT WILLIAMS & WILKINS, 2011) Akman, Serhan; Kalayci, Abdullah; Ataoglu, Hanife; Aykent, FilizThis clinical report describes the treatment of a patient with osseointegrated extraoral implants supporting a framework retainer and acrylic resin mesostructures and a large silicone mid-facial prosthesis. A metal framework was used to splint the implants together and provided satisfactory retention for the facial prosthesis. A 2-piece prosthesis that composed of an obturator and facial prosthesis was fabricated. Cosmetic improvements as well as the ability to speak, swallow, and, to a lesser degree, chew, were achieved for this patient.Öğe Dental porselenlerde tekrarlanan fırınlama işleminin boyutsal stabilite üzerine etkisinin dijital fotogrametri yöntemi ile incelenmesi(Selçuk Üniversitesi Sağlık Bilimleri Enstitüsü, 2003) Akman, Serhan; Eskitaşcıoğlu, GürcanBu çalışmada deformasyonlann mikron seviyesinde 3 boyutlu olarak ölçülebildiği dijital fotogrametrik yöntem kullanılarak dental porselenlerde tekrarlanan fırınlamaların boyutsal stabilite üzerine etkisi araştırılmıştır. 20 adet metal destekli, 20 adet metal desteksiz örnek hazırlanmıştır. Örnekler üzerinde okluzalde 4, aksiyalde 4 nokta referans noktası olarak belirlendi. İki ayrı porselen sisteminde belirlenen noktalar arasında tekrarlanan fırınlamaları takiben alan, çevre ve vektörel uzunluk ölçümleri yapıldı. Görüntüler Nikon Coolpix 950 dijital kamera ile elde edildi. Pictran D ve Pictran B programlan kullanılarak örnekler üzerinde oluşturduğumuz noktalarının koordinattan tespit edildi. Elde edilen veriler NedCad programına aktarılarak analizler gerçekleştirildi. Bulgular istatistiksel ve görsel olarak değerlendirildi. Sonuçlar: 1- Tekrarlanan fırınlama işleminin boyutsal stabilite üzerine etkisi vardır. 2- Tekrarlanan fırınlama işleminde aksiyal yüzler boyutsal stabilite açısından okluzal yüze oranla daha fazla etkilenmektedir. 108 3- İstatistiksel olarak iki porselen sistemi arasında bir fark çıkmamasına karşın görsel olarak benzer davranışlarda farklı seviyeler net olarak gözlemlenmiştir. 4- 2. fırınlamada hem okluzal hem de aksiyal yüzeyde metal destekli porselen örnekler metal desteksiz porselen örneklere oranla görsel olarak daha az etkilenmektedir. 5- 3. fırınlamada okluzal yüzde metal destekli porselen örnekler, aksiyal yüzde ise metal desteksiz porselen örnekler görsel olarak daha az etkilenmektedir. 6- Fırın içerisinde porselen örneklerin pozisyonu ısı ve basınç altında akışkanlık kazanan materyal için yüzey stabilitesi açısından önem taşır. 7- Tekrarlanan fırınlamalarda porselenin fiziksel ve kimyasal yapılarındaki değişim sonucu termal expansiyonda cam geçiş ısısına kadar bilinen lineer artış şekli değişmektedir. 8- Tekrarlanan fırınlama pöröziteyi arttırıp, estetik faktörleri olumsuz yönde etkilemektedir.Öğe The Effect of Different Posts on Fracture Strength of Roots with Vertical Fracture and Re-Attached Fragments(WILEY-BLACKWELL, 2010) Özçopur, Betül; Akman, Serhan; Eskitasçıoğlu, Gürcan; Belli, S.P>The aim of this in vitro study was to test the effect of different post systems on fracture strength of roots with re-attached fragments. Root canals of eighty extracted single-rooted human teeth were instrumented (ProFile) and randomly divided into two groups. The roots in the first group were vertically cracked, and the fragments were re-attached using Super Bond C&B (Sun Medical, Tokya, Japan). The roots in the second group were kept sound. Obturation of the roots was performed with MetaSEAL (Sun Medical) and gutta-percha. Post spaces were prepared, and the roots were restored with one of the followings: UniCore (Ultradent), Everstick (Stick Tech), Ribbond (Ribbond), ParaPost (Coltene/Whaledent) (n = 10). Four mm high build-ups were created (Clearfil DC Bond Core; Kuraray, Tokyo, Japan). Compressive loading of the samples was performed after 24 h (1 mm min-1). Mean load necessary to fracture each sample was recorded (Newton) and statistically analysed (One-way anova, t-tests). ParaPost showed the highest fracture strength among the roots with re-attached fragments (P < 0.05). UniCore and ParaPost systems showed similar fracture strength in the sound roots (P > 0.05). Re-attached fragments significantly reduced the fracture strength of roots in UniCore group (P = 0.000). Ribbond post showed mostly repairable fractures. Metal post (ParaPost) showed the highest fracture strength in the roots with re-attached fragments; however, fracture pattern was 41% non-repairable. Re-attached fragments significantly reduced the fracture strength of the roots in UniCore group. Prefabricated posts showed similar fracture strength in the sound roots. Customized post systems EverStick and Ribbond showed mostly repairable failure after loading in sound roots or roots with re-attached fragments.Öğe Effect of surface treatment methods on the shear bond strength between resin cement and all-ceramic core materials(ELSEVIER, 2012) Yucel, Munir Tolga; Aykent, Filiz; Akman, Serhan; Yondem, IsaThis study compared the influence of various surface treatments on the shear bond strength between resin cement and lithium disilicate glass-ceramics. A series of 120 lithium disilicate ceramic samples were prepared to compare the effect of different surface treatments on the shear strength of a luting cement bonded to two all-ceramic systems. IPS Empress 2 and IPS e.max Press ceramic samples were fabricated according to the manufacturer's instructions. The ceramic samples were divided into the following 6 surface treatment groups for each ceramic system: 1-no treatment (C), 2-airborne-particle abrasion (A), 3-acid etching (E), 4-airborne-particle abrasion + acid etching (AE), 5-Nd:YAG laser (L), 6-Nd:YAG laser + acid etching (LE). Resin cement was then bonded to the treated ceramic surfaces and light polymerized. The shear bond strengths of the specimens were measured using a universal testing machine. Two-way ANOVA and Tukey HSD (alpha=0.05) test were used to determine differences in shear bond strength between the groups. The ANOVA revealed significant differences between the treatment groups and ceramic types (p < 0.05). The shear bond strengths of IPS Empress 2 were significantly higher than those of IPS e.max Press. (C) 2012 Elsevier B.V. All rights reserved.Öğe The Effects of Laser with Different Parameters and Crosshatching on Fibroblast Adhesion and Proliferation to Implant Surfaces(QUINTESSENCE PUBLISHING CO INC, 2017) Celebi, Hakki; Arpaci, Pembegul Uyar; Celik, Ilhami; Akman, SerhanPurpose: To compare the adhesion and proliferation effect of HGF-1 cells on pure titanium disks when the surfaces are unprocessed (machined surfaces after slicing) or modified with a laser. Materials and Methods: Twenty-eight titanium disks were divided into four groups. Three surface topographies were created using an erbium fiber laser: group 1 (unidirectional application [no crosshatch]), group 2 (crosshatching in two directions), and group 3 (crosshatching in three directions). The samples in group 4 were unprocessed and served as controls. The surface roughness of samples was investigated with scanning electron microscopy (SEM) and measured with a mechanical surface profilometer. HGF-1 cell line was used to analyze the adhesion of fibroblasts on the sample surfaces. The authors used SEM, XTT, and acridine orange tests to determine the adhesion of HGF-1 onto specimen surfaces and the cell morphology after incubation for 72 hours. XTT results and surface roughness values for all specimens were analyzed using the Kruskal-Wallis test. Results: Ra values of group 1 to group 4 (control) were 1.13, 0.26, 0.38, and 0.19, respectively. Crosshatching decreased the surface roughness values compared with unidirectional application (P = .003). Cell morphology observed in SEM showed that the elongation direction of cells resulted in all directions related with additional filopodia extentions within the crosshatch groups. Therefore, the highest cell viability was also detected in the three-directional crosshatch group (group 3) (P = .000) in XTT assay. According to the acridine orange test, higher cell numbers were seen in group 3, similar to the XTT findings (P = .86). Conclusion: Crosshatching significantly increased the cell-covered implant surfaces compared with the unidirectional group. Decreasing the surface Ra values via crosshatching helped spread the fibroblast over the implants in any direction, thus increasing cell proliferation and adhesion.Öğe The finite element analysis of the effect of ferrule height on stress distribution at post-and-core-restored all-ceramic anterior crowns(SPRINGER HEIDELBERG, 2009) Eraslan, Oguz; Aykent, Filiz; Yucel, M. Tolga; Akman, SerhanThe purpose of this study was to compare the effect of ferrule with different heights on the stress distribution of dentin and the restoration-tooth complex, using the finite element stress analysis method. Three-dimensional finite element models simulating an endodontically treated maxillary central incisor restored with an all-ceramic crown were prepared. Three-dimensional models were varied in their ferrule height (NF: no ferrule, 1F: 1-mm ferrule, and 2F: 2-mm ferrule). A 300-N static occlusal load was applied to the palatal surface of the crown with a 135 degrees angle to the long axis of the tooth. In addition, two post and core materials with different elastic modulus were evaluated. The differences in stress transfer characteristics of the models were analyzed. Maximum stresses were concentrated on force application areas (32.6-32.8 MPa). The stress values observed with the use of a 2-mm ferrule (14.1/16.8 MPa) were lower than the no-ferrule design (14.9/17.1 MPa) for both the glass fiber-reinforced and zirconium oxide ceramic post systems, respectively. The stress values observed with zirconium oxide ceramic were higher than that of glass fiber-reinforced post system. The use of a ferrule in endodontically treated teeth restored with an all-ceramic post-and-core reduces the values of von Mises stresses on tooth-restoration complex. At rigid zirconium oxide ceramic post system, stress levels, both at dentin wall and within the post, were higher than that of fiber posts.Öğe In vivo evaluation of titanium-prepared platelet-rich fibrin (T-PRF): a new platelet concentrate(CHURCHILL LIVINGSTONE, 2013) Tunali, Mustafa; Ozdemir, Hakan; Kucukodaci, Zafer; Akman, Serhan; Firatli, ErhanWe have developed a new, titanium-prepared, platelet-rich fibrin (T-PRF) together with the protocol for forming it, which is based on the hypothesis that titanium tubes may be more effective at activating platelets than the glass tubes used by Chouckroun in his platelet-rich fibrin (PRF) method. The aim of this study was to find a suitable animal model in which to evaluate the method and to investigate the efficacy of T-PRF for wound healing. Blood samples from 6 rabbits were used to confirm the protocol for formation of T-PRF. We evaluated T-PRF or T-PRF-like clots morphologically using scanning electron microscopy (EM). Blood samples from 5 rabbits were used to develop an experiment in which to evaluate the effects of T-PRF on wound healing. The mucoperiosteal flaps were filled with autologous T-PRF membranes from the vestibule in the anterior mandibular regions. Samples collected from the surgical sites were stained with haematoxylin and eosin. We found a mature fibrin network in T-PRF clots that had been centrifuged for 15 min at 3500 rpm and, 15 days after placement of the membrane, we found newly-forming connective tissue and islets of bony tissue in the T-PRF membrane. These results show that T-PRF could induce the formation of new bone with new connective tissue in a rabbit model of wound healing within 30 days of treatment. Published by Elsevier Ltd. on behalf of The British Association of Oral and Maxillofacial Surgeons.Öğe Influence of several fibre-reinforced composite restoration techniques on cusp movement and fracture strength of molar teeth(WILEY, 2011) Akman, Serhan; Akman, Melek; Eskitaşcıoğlu, Gülhan; Belli, SemaP>Aim To compare mean cusp movement in molar teeth with endodontic access and mesial-occlusal-distal (MOD) cavities before and after restoration with several fibre-reinforced composite restoration techniques under loading and to evaluate the effect of restoration technique on fracture strength. Methodology Reference points were marked at the mesial cusp ridges of extracted human mandibular molar teeth. Digital images were taken under loading (300 N) using a stereomicroscope (Leica MZ16A; Wetzlar, Germany). Three-dimensional (3D) distances between the reference points were recorded (Leica, Stereo-Explorer, 2.1) as controls. Standard MOD cavities were prepared and restored as follows (n = 10), group 1: composite restoration (Clearfil AP-X; Kuraray, Tokyo, Japan); group 2: cavity lined with polyethylene fibre (Ribbond, Ribbond Inc., Seattle, WA, USA) in combination with flowable resin (Protect-Liner F; Kuraray, Tokyo, Japan) before composite restoration; group 3: polyethylene fibre inserted on occlusal surface of the tooth from buccal to lingual after finishing the composite restoration; group 4: missing walls were restored with composite resin and inner surfaces of the axial walls were then reinforced with polyethylene fibre placed circumferentially before the composite restoration. The restored teeth were re-loaded, digital images were re-taken and the 3D distance between the reference points was recorded in mu m. Comparisons of the restoration techniques, the effectiveness of restoration for each group were analysed statistically (Kruskall-Wallis, paired-samples t-test). The teeth were then loaded until failure (5 mm min-1), the data were recorded (N) and analysed statistically (Kruskall-Wallis test). Results A significant difference occurred amongst the groups in terms of cusp movement (P = 0.018). All the groups revealed a decrease in inter-cuspal width when compared to their initial records. The mean values of these decreases were as follows: group 1 17.6 (P = 0.003), group 2 6.7 (not sig), group 3 6.6 (not sig) and group 4 0.85 (not sig) mu m. No significant difference was found amongst the fracture strength values (P = 0.22). In group 1, 90% of the fractures were non-restorable, whereas in group 3 100% of the fractures were restorable. Conclusions Regardless of restoration technique, fibre reinforcement of composite restorations decreased cusp movement in molar teeth with MOD and endodontic access cavities but did not affect fracture strength.Öğe Modification of Maxillary Sinus Floor With Orthodontic Treatment and Implant Therapy: A Case Letter(ALLEN PRESS INC, 2014) Saglam, Mehmet; Akman, Serhan; Malkoc, Siddik; Hakki, Sema S.[Abstract not Available]Öğe A novel platelet concentrate for guided bone regeneration: Titanium prepared platelet-rich fibrin (T-PRF)(Gulhane Medical School, University of Health Sciences, 2015) Tunalı, Mustafa; Özdemir, Hakan; Küçükodacı, Zafer; Ezirganlı, Şeref; Barış, Emre; Akman, Serhan; Atay, ArzuIn our previous studies, we developed a novel platelet-rich product that we called titaniumprepared platelet-rich fibrin (T-PRF). T-PRF is based on the hypothesis that titanium may be more effective at activating platelets than the silica activators used with glass tubes in Chouckroun's platelet-rich fibrin (PRF). This study aimed to assess the effects of T-PRF on bone augmentation in a rabbit calvaria model. Twenty-four adult male New Zealand rabbits were used in the study. T-PRF alone, inorganic bovine bone (ABB), and T-PRF + ABB were used in the experimental groups. No material was used in the control group. Half of the animals were sacrificed after one month, and the remaining animals were sacrificed 3 months later. A histomorphometric evaluation was performed to compare new bone formation among the groups. More new bone areas were determined in the T-PRF group than the other three groups. While less new bone formation was observed than in the T-PRF group, more new bone formation occurred in the ABB and T-PRF + ABB groups when compared to the control group. Basing on the results of this study, we can say that T-PRF membrane can be successfully used for bone augmentation. © Gülhane Askeri Tip Akademisi 2015.Öğe A Novel Platelet Concentrate: Titanium-Prepared Platelet-Rich Fibrin(HINDAWI LTD, 2014) Tunali, Mustafa; Ozdemir, Hakan; Kucukodaci, Zafer; Akman, Serhan; Yaprak, Emre; Toker, Hulya; Firatli, ErhanWe developed a new product called titanium-prepared platelet-rich fibrin (T-PRF). The T-PRF method is based on the hypothesis that titanium may be more effective in activating platelets than the silica activators used with glass tubes in Chouckroun's leukocyte- and platelet-rich fibrin (L-PRF) method. In this study, we aimed to define the structural characteristics of T-PRF and compare it with L-PRF. Blood samples were collected from 10 healthy male volunteers. The blood samples were drawn using a syringe. Nine milliliters was transferred to a dry glass tube, and 9 mL was transferred to a titanium tube. Half of each clot (i.e., the blood that was clotted using T-PRF or L-PRF) was processed with a scanning electron microscope (SEM). The other half of each clot was processed for fluorescence microscopy analysis and light microscopy analysis. The T-PRF samples seemed to have a highly organized network with continuous integrity compared to the other L-PRF samples. Histomorphometric analysis showed that T-PRF fibrin network covers larger area than L-PRF fibrin network; also fibrin seemed thicker in the T-PRF samples. This is the first human study to define T-PRF as an autogenous leukocyte-and platelet-rich fibrin product. The platelet activation by titanium seems to offer some high characteristics to T-PRF.Öğe OLUŞAN RETROGRAT PERİ-İMPLANTİTİSİN CERRAHİ OLMAYAN TEDAVİSİ: OLGU SUNUMU(2015) Tunalı, Mustafa; Koyuncuoğlu, Cenker Zeki; Akman, Serhan; Selek, Burak; Yıldırım, Ersin; Aydınbelge, MustafaRetrograt peri-implantitis (RPİ) implant başarısızlıklarının önemli bir nedenini oluşturmaktadır. RPİ'in çok sayıda potansiyel etiyolojik faktörü ve tedavi yöntemi literatürde tartışılmış olmasına rağmen, nedeni tam olarak açıklığa kavuşturulamamıştır ve tedavi yöntemi konusunda da bir fikir birliği oluşamamıştır. Vaka Raporu Vaka raporu 28 yaşındaki erkek hastada, başarısız endodontik tedaviler sonucu kaybedilmiş üst çene keser dişler bölgesine uygulanan implantlardan birinin apikal bölge çevresindeki radyolosensi'nin tedavisini içermektedir. Bölgeye iki implant uygulamasından üç ay sonra, sol taraftaki implantın apikal bölgesinde radyolosensi ve klinik olarak implant apikaline uzanan sinüs yolu teşhis edildi. Mikrobiyal değerlendirme sonrasında, hastaya antimikrobiyal tedavi uygulandı ve 12 ay boyunca takip edildi. Radyolosent alanın, başka bir tedavi uygulamasına gerek kalmaksızın, kademe kademe azaldığı gözlemlendi. Hastanın, son restoratif tedavisi yapılana kadar herhangi bir şikayeti tespit edilmedi. Sonuç Başarısız endodontik tedavi veya apikal rezeksiyon alanındaki bakteriyal enfeksiyon, RPİ'nin oluşumunda potansiyal bir etiyolojik faktör olabilir. Retrograt periapikal implant lezyonların tedavisinde antibiyotik uygulamasının tek başına bir tedavi seçeneği olabileceği düşünülmektedir.Öğe Prosthetic Rehabilitation of Partial Ear Defect: 2 Case Reports(Springer India, 2014) Subaşı, Gülce; Alnıaçık, Gamze; Kalaycı, Abdullah; Akman, Serhan; Durmuş, ErcanThe loss or absence of an auricle may result from trauma, disease or congenital anomalies and causes a considerable aesthetic problem. If the deformity involves the external auditory canal, it can affect hearing. This case report describes the surgical and prosthetic treatment of two patients with partial defects of their right external ears from different causes. Implant-retained auricular prostheses fabricated from heat-temperature-vulcanised silicone were used in both the cases; they were designed to be harmonious with the remaining tissues. The patients experienced improved retention, aesthetics, hearing and quality of life with these prostheses. During the approximately 3 year follow-up, both the prostheses were re-fabricated once; however, problems related to implant stability and peri-implant tissue health were not encountered. © 2013, Indian Prosthodontic Society.Öğe Temporomandibular Eklem Seslerini Değerlendirme Yöntemleri(Selçuk Üniversitesi, 2023 Aralık) Yayman, Mevsim; Akman, SerhanTemporomandibular eklem sesleri, temporomandibular eklemdeki patolojik değişikliklere işaret eden en önemli bulgulardan biridir. Eklem seslerinin doğru bir şekilde tanımlanması ve değerlendirilmesi, hekimleri uygun tanı ve tedavi seçeneklerine yönlendirmektedir. Eklem seslerinin değerlendirilmesi için öznel ve nesnel yöntemler uygulanmaktadır. Palpasyon, oskültasyon ve stetoskop ile dinleme gibi öznel yöntemler, klinikte uygulama kolaylıkları nedeniyle sıklıkla tercih edilmelerine rağmen bu yöntemlerin tekrarlanabilir olmamaları ve gözlemciler arası karşılaştırmalar yapmaya izin vermemeleri gibi dezavantajları bulunmaktadır. Nesnel yöntemler ise sıklıkla ekipman ve teknik hassasiyet gerektirmektedirler. Bununla birlikte, eklem seslerinin kaydı ve analizine izin veren bu yöntemler, tedavi süreçlerinin nesnel bir şekilde değerlendirilmesine olanak tanımaktadır. Bu derlemede, eklem seslerinin klinik açıdan önemi, sesin parametreleri ve eklem seslerinin değerlendirilmesinde kullanılan öznel ve nesnel yöntemler ele alınmıştır.Öğe The Use of Endodontically Treated and/or Fiber Post-Retained Teeth as Abutments for Fixed Partial Dentures(SPRINGER HEIDELBERG, 2012) Akman, Serhan; Akman, Melek; Eskitaşcıoğlu, Gürcan; Belli, SemaThe purpose of this in vitro study was to evaluate the effect of endodontic treatment with or without fiber-post restorations on the fracture strength of abutment teeth under fixed partial dentures (FPDs). Seventy extracted premolar and canine teeth were used. Groups of fiber-post-retained and root-filled teeth were endodontically treated. The teeth were embedded in an acrylic resin perpendicular to the horizontal plane to create fixed partial dentures. The following groups were created using different abutments: (1) sound (S) canine/S premolar, (2) S canine/endodontically treated (ET) premolar, (3) ET canine/S premolar, (4) ET canine/ET premolar, (5) S canine/fiber-post-restored (FPR) premolar, (6) FPR canine/S premolar, and (7) FPR canine/FPR premolar. Each tooth was prepared for a complete-coverage full-metal crown. Impressions were taken; metal frameworks were fabricated and cemented. The samples were exposed to 5,000 cycles of thermomechanical fatigue and loaded compressively until fracture (2 mm/min). The data were statistically analyzed using (Kruskal-Wallis test, alpha = 0.05). No significant difference was found among the mean fracture strengths of the groups (p = 0.696). There were distinct differences in failure patterns. All of the fracture types were horizontal, and neither vertical nor non-restorable root fractures were recorded. Premolars seemed to be a critical abutment compared to canines when they were sound under FPDs. The percentage of cervical fractures was high in endodontically treated teeth when compared to post-retained groups. In case of post-debonding, the abutment fracture did not occur. When root-filled teeth are used as abutments for FPDs, fiber-post restorations or the creation of abutments from similar structures (ET/ET or FPR/FPR) results in improved conservation of root structure under loading when compared to the abutments from different structures (S/ET, ET/S, FPR/S, S/FPR).
