Kerem Kilic

A reactive lesion (pyogenic granuloma) associated with dental implant: a case report.

D ental osseointegrated implants are made of titanium, which is a tissuefriendly and osseointegratable material; the implants have been widely used in preprosthetic surgery. Dental plaque, inadequate oral hygiene, traumatic occlusion, and anatomic drawbacks can cause complications associated with dental implants resulting in peri-implantitis and implant failure. However, gingival reactive lesions like Pyogenic granuloma (PG) or peripheral giant cell granuloma (PGCG) are thought of as common lesions in the natural dentition while such lesions in association with dental implants are uncommon. Pyogenic granuloma is a common, inflammatory hyperplasia of the oral cavity. Although the term ‘‘pyogenic’’ is used, PG is not an infectious lesion. PG usually occurs as a response to different stimulating factors such as local trauma or irritation, iatrogenic and hormonal factors. Because of the female hormone factor it has very high incidence in young females, principally in the second decade of life. Clinically, PG presents as a painless, smooth, or lobulated shape. It is classed as a hemorrhagic lesion because of its vascular structure and its color ranges from pink to dark red. In addition, it bleeds very easily when touched. Sometimes its surface may be covered by a pseudo-membrane due to secondary ulcerations. There are only two case reports in the literature that describe PG associated with dental implants. The aim of this paper is to present the case of a patient with PG in association with dental implant, which had been inserted after bone splitting.

Do blood contamination and haemostatic agents affect microtensile bond strength of dual cured resin cement to dentin

Objective: The purpose of this study was to evaluate the effects of blood contamination and haemostatic agents such as Ankaferd Blood Stopper (ABS) and hydrogen peroxide (H2O2) on the microtensile bond strength between dual cured resin cement-dentin interface. Material and Methods: Twelve pressed lithium disilicate glass ceramics were luted to flat occlusal dentin surfaces with Panavia F under the following conditions: Control Group: no contamination, Group Blood: blood contamination, Group ABS: ABS contamination Group H2O2: H2O2 contamination. The specimens were sectioned to the beams and microtensile testing was carried out. Failure modes were classified under stereomicroscope. Two specimens were randomly selected from each group, and SEM analyses were performed. Results: There were significant differences in microtensile bond strengths (µTBS) between the control and blood-contaminated groups (p<0.05), whereas there were no significant differences found between the control and the other groups (p>0.05). Conclusions: Contamination by blood of dentin surface prior to bonding reduced the bond strength between resin cement and the dentin. Ankaferd Blood Stoper and H2O2 could be used safely as blood stopping agents during cementation of all-ceramics to dentin to prevent bond failure due to blood contamination.

Alternative method to reposition the dislocated transport segment during vertical alveolar distraction.

g fi f m p e t d u e t oi:10.1016/j.joms.2009.04.026 . Pintol PX, Debnath S: Use of pedicle graft of buccal fat pad to line a nasal defect in releasing pushback palatoplasty. Br J Oral Maxillofac Surg 45:249, 2007 . Clark JM, Saffold SH, Israel JM: Decellularized dermal grafting in cleft palate repair. Arch Facial Plast Surg 5:40, 2003 . Panetta NJ, Gupta DM, Slater BJ, et al: Tissue engineering in cleft palate and other congenital malformations. Pediatr Res 63:545, 2008 . Salyer KE, Sng KW, Sperry EE: Two-flap palatoplasty: 20-year experience and evolution of surgical technique. Plast Reconstr Surg 118:193, 2006 . Tian M, Bing Shi, Xu Huang, et al: Roles of different area of palatine bone denudation on growth and development of maxilla and dental arch: An experimental study in rats. J Craniofac Surg 18:391, 2007 . Choudhary S, Cadier MA, Shinn DL, et al: Effect of Veau-WardillKilner type of cleft palate repair on long-term midfacial growth. Plast Reconstr Surg 111:576, 2003

Stress distribution of oval and circular fiber posts in amandibular premolar: a three- dimensional finite element analysis

PURPOSE The aim of the present study was to evaluate the effects of posts with different morphologies on stress distribution in an endodontically treated mandibular premolar by using finite element models (FEMs). MATERIALS AND METHODS A mandibular premolar was modeled using the ANSYS software program. Two models were created to represent circular and oval fiber posts in this tooth model. An oblique force of 300 N was applied at an angle of 45° to the occlusal plane and oriented toward the buccal side. von Mises stress was measured in three regions each for oval and circular fiber posts. RESULTS FEM analysis showed that the von Mises stress of the circular fiber post (426.81 MPa) was greater than that of the oval fiber post (346.34 MPa). The maximum distribution of von Mises stress was in the luting agent in both groups. Additionally, von Mises stresses accumulated in the coronal third of root dentin, close to the post space in both groups. CONCLUSION Oval fiber posts are preferable to circular fiber posts in oval-shaped canals given the stress distribution at the post-dentin interface.

Evaluation of the retention force of double conical crowns used in combination with a galvanoforming and casting fabrication technique.

PURPOSE The aim of this study was to measure the in vitro retention force of double conical crowns fabricated using primary galvanoforming and secondary casting techniques and those fabricated using primary casting and secondary galvanoforming techniques under simulated clinical conditions before and after a wear test. MATERIALS AND METHODS Primary galvanoformed crowns (n = 10) with non-noble secondary crowns (n = 10; group A) and primary non-noble crowns (n = 10) with secondary galvanoformed crowns (n = 10; group B) were fabricated. Each primary and secondary crown was embedded in acrylic resin and weighed with a digital balance. Retention forces were then measured using a universal testing device. To simulate wear, specimens were inserted and separated horizonatally 3285 times in wear equipment with artificial saliva. Retention forces and weights of the double crowns were then remeasured. Data were analyzed using paired t-tests and Wilcoxon tests, and the groups were compared using Mann-Whitney U-tests. RESULTS In group A, the wear test had a significant influence on the retentive force (p < 0.05), but wear produced no significant difference in weight (p > 0.05). In group B, the wear test had a significant influence on the retentive force (p < 0.05), and wear produced a significant difference in weight (p < 0.05). CONCLUSIONS The results of this study indicated that the use of different combinations of galvanoforming and casting techniques in the fabrication of conical crowns significantly affected retention force.

Evaluation of the resin cement thicknesses and push-out bond strengths of circular and oval fiber posts in oval-shapes canals

PURPOSE The aim of this study was to evaluate whether the push-out bond strength varies between oval and circular fiber posts, and to examine the effect on the resin cement thicknesses around the posts. MATERIALS AND METHODS Eighteen mandibular premolar roots were separated into two groups for oval and circular fiber posts systems. Post spaces were prepared and fiber posts were luted to the post spaces. Roots were cut horizontally to produce 1-mm-thick specimens. Resin cement thicknesses were determined with a metallographic optical microscope and push-out tests were done. RESULTS No significant differences were observed in terms of push-out bond strength between the oval and circular fiber posts (P>.05) The resin cement thicknesses of the oval posts were greater than those of the circular posts group in the coronal, middle and apical specimens (P<.05). CONCLUSION In the light of these results, it can be stated that resin cement thickness does not affect the push-out bond strength.

Infrared Thermographic Comparison of Temperature Increases on the Root Surface during Dowel Space Preparations Using Circular versus Oval Fiber Dowel Systems

PURPOSE The purpose was to evaluate temperature increases during dowel space preparations with oval and circular fiber dowel systems. MATERIALS AND METHODS This study included 42 single-rooted human mandibular premolars. Roots were scanned with cone-beam computerized tomography (CBCT) to determine the ovoid root canal morphology. Root canals were treated with Ni-Ti rotary instruments and obturated. A second CBCT was taken to determine the thinnest dentin thickness of each root. Roots were randomly divided into two groups (n = 21) according to the fiber dowel system used: group 1, circular fiber dowel system (D.T. Light-Post); group 2, oval fiber dowel system (Ellipson Post). Dowel spaces were prepared using a circular fiber dowel drill and a diamond-coated ultrasonic tip with an oval section under water cooling until 9 mm dowel spaces were obtained. Temperature changes were recorded from the thinnest root surfaces using a FLIR E60 thermal imaging camera. RESULTS Temperature increases were significantly greater with the circular fiber dowel system than with the oval fiber dowel system (p < 0.05). CONCLUSIONS Although both dowel systems generated high temperature increases on root surfaces, the relatively lower temperature increase associated with the use of oval fiber dowels in ovoid canals makes it preferable to the use of circular fiber dowels.

Farklı post boylarının ve farklı siman kullanımının kron ile restore edilmiş dişlerin kırılma dayanımına etkisi

Farkli post boylarinin ve farkli siman kullaniminin kron ile restore edilmis dislerin kirilma dayanimina etkisi Amac: Bu calismanin amaci post-kor ve kronla restore edilmis dislerde farkli simantasyon materyallerinin ve post uzunluklarinin kirilma direncine etkisini degerlendirmektir. Gerec ve Yontemler: Benzer boylara sahip 40 mandibular premolar disin kronlari uzaklastirildi. Kanal tedavileri yapildiktan sonra disler akrilik bloklara gomuldu. Ornekler ilk olarak ikiye ayrildi. 10 mm ve 5 mm derinliklerinde sirkuler post bosluklari, sirasiyla #0.5 ve #2 kodlu uretici frezleri ile hazirlandi. Post (D.T. Light-Post) simantasyonu asamasinda, her post grubundaki 10 ornek kendinden adezivli rezin siman (Rely X) ile simante edildi. Diger 10 ornek kendinden asitli kompozit siman (Clearfill Esthetic Cement) ile simante edildi (n=10). Tum ornekler kompozit korlar ile restore edildi ve toplamda yaklasik 5°’lik konverjans acisiyla 6 mm boyunda (1 mm ferrule dahil) prepare edildi. Sonra, tum disler tam metal kronlarla, cam iyonomer simanla simante edilerek restore edildi. Termal dongu ile yorma sonrasi, tum orneklere kirilma dayanimi testi (0,5 mm/min) uygulandi. Data iki yonlu varyans analizi kullanilarak analiz edildi (α=0.05). Bulgular: Farkli tip siman kullanimi restore edilmis dislerin kirilma dayanimini etkilemezken (p=0.209), 10 mm derinlikte post yerlesimi 5 mm derinlikte yerlesime gore daha yuksek kirilma dayanimi gostermistir (p<0.001).Sonuc: Calismanin limitasyonlari dahilinde, hangi tip simanin kullanildigina bakilmaksizin, post boslugunun daha derin acilmasi post-kor destekli kron restorasyonlu dislerin kirilma dayanimini artirmaktadir.

Effect of Delayed Bonding and Antioxidant Application on the Bond Strength to Enamel after Internal Bleaching

PURPOSE This study evaluated the effect of delayed bonding and antioxidant application (AA, 10% sodium ascorbate) after internal bleaching (35% carbamide peroxide) on the shear bond strength of an adhesive cement to enamel. MATERIALS AND METHODS Eighty-four human maxillary central incisors were endodontically treated. The control group remained unbleached with no AA. Experimental groups were all internally bleached. The buccal enamel was finished and polished with metallographic paper to a refinement of #600, in order to obtain a 5-mm(2) flat bonding area. An adhesive cement (Clearfil Esthetic) was placed into a plastic tube with internal diameter of 3 mm and a 3-mm height and cured on the enamel. Bonding occurred either immediately after bleaching (group Im), a 7-day delay (group 7), or a 14-day delay (group 14), and half the specimens were treated with antioxidant application (groups Im-AA, 7-AA, and 14-AA). Shear bond strength testing was performed on a universal testing machine, and data were analyzed with ANOVA and Fisher test (5%). RESULTS Delaying of bonding is a useful factor for enhancing shear bond strength (p < 0.05), whereas AA only enhanced shear bond strength after 7 days delayed bleaching (p < 0.05). The highest bond strength was noted in groups 7-AA (20.51 ± 4.5 MPa), 14 (19.82 ± 4.6), 14-AA (20.27 ± 4.4), and control (20.51 ± 5.1), which were not significantly different from each other. CONCLUSIONS After internal bleaching, adhesive cementation to enamel is recommended only when delayed 14 days, or delayed 7 days with sodium ascorbate application.

Fracture resistance of teeth with oval canal morphology restored using oval and circular posts

The study aimed to evaluate the effects of different post morphologies and placement lengths on the fracture resistance of teeth with oval canal morphology that had been restored with crowns. Extracted mandibular premolars with similar dimensions were decoronated. After the root canal treatment, the teeth were mounted on acrylic blocks. Samples were randomly divided into four groups (n = 10 each). In groups C-10 and C-5, 10-mm- and 5-mm-long circular post spaces were created. In groups O-10 and O-5, 10-mm- and 5-mm-long oval post spaces were ultrasonically created. After post cementation, all specimens were restored with composite cores and prepared at height of 6 mm. Thereafter, all teeth were restored with crowns. After thermocycling, all specimens underwent fracture resistance testing. Oval posts and placement at 10-mm depth showed higher fracture resistance than circular posts and placement at 5-mm depth (P < 0.001). Increased post length and use of oval posts enhanced the fracture strength of teeth with oval canal morphology. Based on the results of this study, although the fracture resistance of teeth restored with crowns was enhanced by deep fiber post placement, the use of oval fiber post is recommended in cases where deep placement is impossible. (J Oral Sci 58, 339-345, 2016).