Publications by authors named "Caner Yilmaz"

8 Publications

  • Page 1 of 1

May Autogenous Grafts Increase the Effectiveness of Hyalonect Membranes in Intraosseous Defects: An Experimental In Vivo Study.

Medicina (Kaunas) 2021 Apr 29;57(5). Epub 2021 Apr 29.

Department of Oral Implantology, Faculty of Dentistry, Istanbul University, Istanbul 34093, Turkey.

: Guided bone regeneration (GBR) surgeries are used for dental implant placements with insufficient bone volume. Biomaterials used in GBR are expected to produce sufficient volume and quality of bone swiftly. This study aims to histologically evaluate the effectiveness of the use of Hyalonect membranes alone or with autogenous grafts in intraosseous defects. : This study is an experimental study on sheep. Surgeries were performed under general anesthesia in accordance with ethical rules. Five 10 mm defects were surgically created in each ilium of six sheep. One defect was left empty in each ilium (group ED). The defects in the experimental group were covered with Hyalonect membrane while unfilled (group HY) or after being filled with autogenous bone grafts (ABG) (group G+HY). In the control group, the defects were either covered with collagen membrane while unfilled (group CM) or after being filled with the ABG group (G+CM). The sheep were histologically and histomorphometrically evaluated after being postoperatively sacrificed in the third and sixth week (three animals in each interval). : All animals completed the study without any complications. No difference was found between groups in the third and sixth weeks regarding the inflammation, necrosis, and fibrosis scores. The G+CM (52.83 ± 3.06) group was observed to have a significantly higher new bone formation rate than all the other groups in the third week, followed by the G+HY group (46.33 ± 2.25). Similar values were found for HY and CM groups (35.67 ± 4.55 ve 40.00 ± 3.41, respectively, = 0.185), while the lowest values were observed to be in group ED (19.67 ± 2.73). The highest new bone formation was observed in group G+CM (82.33 ± 4.08) in the sixth week. There was no difference in new bone formation rates between groups G+CM, G+HY (77.17 ± 3.49, = 0.206), and CM (76.50 ± 2.43, = 0.118). The insignificant difference was found ED group and group HY (55.83 ± 4.92, 73.50 ± 3.27, respectively, = 0.09). The residual graft amount in the G+CM group was found to be statistically significant at 3 weeks ( = 0.0001), compared to the G+HY group, and insignificantly higher at the 6th week ( = 0.4). : In this study, close values were observed between G+HY and G+CM groups. Further experimental and clinical studies with different graft materials are required to evaluate the effectiveness of HY in GBR.
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http://dx.doi.org/10.3390/medicina57050430DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8146224PMC
April 2021

Fabricating a hollow obturator with visible light-cured resin system.

J Prosthodont 2008 Oct 20;17(7):596-8. Epub 2008 Jun 20.

Department of Prosthodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.

Obturators are routinely used in the rehabilitation of maxillectomy defects. Ideally, obturators should be easily constructed to produce a comfortable and stable prosthesis. This article describes a technique that provides an easy method for the construction of an obturator prosthesis using a visible light-cured (VLC) resin. As a result, technicians can easily construct obturators in little time; this would, in turn, provide patients with light, comfortable, and tolerable prostheses.
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http://dx.doi.org/10.1111/j.1532-849X.2008.00335.xDOI Listing
October 2008

Implant-retained auricular prostheses: an assessment of implant success and prosthetic complications.

Int J Prosthodont 2008 May-Jun;21(3):241-4

Gazi University, Faculty of Dentistry, Department of Prosthodontics, 8. Cadde, 82. Sokak, Emek-Ankara 06510, Turkey.

The aims of this study were to evaluate the success rates and peri-implant soft tissue responses of auricular implants, to assess prosthetic complications, and to calculate the survival rate of silicone auricular prostheses. Twenty-nine extraoral implants were placed in 10 patients with 11 auricular defects. Implant failure was defined as clinically detectable implant mobility, and a 5-point scale was used to record the health of peri-implant soft tissues. Prosthetic complications were assessed, and the survival rate of silicone auricular prostheses was calculated using Kaplan-Meier analysis. The implant success rate was 100%. A few soft tissue problems were noted. The overall cumulative survival rate for the first prostheses of the patients was 70% after 18 months. The mean survival time was 17 months. Extraoral implants had a very high success rate in the mastoid region. Prosthetic assessment indicated that although experience with wearing prostheses reduces retention degradation, discoloration and reduced quality of fit at the prosthesis edge over time remain the major problems in maxillofacial prosthetics.
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August 2008

The use of dental implants to retain thumb prostheses: a short-term evaluation of 2 cases.

Int J Prosthodont 2008 Mar-Apr;21(2):138-40

Department of Prosthodontics, Faculty of Dentistry, Gazi University, Emek-Ankara, Turkey.

This article presents the use of dental implants for the retention of thumb prostheses. Two patients with traumatic amputation of the thumb were rehabilitated with implant-supported digital prostheses. A dental implant was placed in the residual bone of the thumb. After a 3-month osseointegration period, retentive attachment and silicone prostheses were fabricated. Osseointegration of the implant, peri-implant skin health, and prosthesis function were assessed every 6 months. The follow-up period was 18 months for patient 1 and 21 months for patient 2. Osseointegration was achieved, and there were no skin problems. Some degree of tactile sensation was observed, and the patients were satisfied with the esthetic result.
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August 2008

Antibacterial and antifungal properties of polyether impression materials.

J Oral Sci 2007 Dec;49(4):265-70

Department of Prosthodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.

The aim of this study was to evaluate the antibacterial and antifungal properties of polyether impression materials using the agar diffusion test. Three different types of polyether impression materials (P2, Penta Soft and Penta) were tested to determine their ability to inhibit the growth of Enterococcus faecalis, Staphylococcus aureus, Pseudomonas aeruginosa, and Candida albicans. The areas of inhibition zones were measured visually with a 0.1-mm incremental Boley gauge. In all groups, none of the samples of the P2 polyether impression material exhibited antibacterial or antifungal activity against any of the microorganisms. All Penta Soft and Penta samples exhibited antibacterial activity against E. faecalis and S. aureus, and only Penta samples exhibited antifungal effect against C. albicans, which decreased progressively as the setting time of the material increased.
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http://dx.doi.org/10.2334/josnusd.49.265DOI Listing
December 2007

Color stability of glazed and polished dental porcelains.

J Prosthodont 2008 Jan 30;17(1):20-4. Epub 2007 Oct 30.

Department of Prosthodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.

Purpose: The purpose of this study was to compare the visual and colorimetric color stability of two ultra low-fusing and three conventional low-fusing porcelains on both glazed and polished surfaces.

Materials And Methods: Twelve disks, 10 mm in diameter and 3 mm in thickness, were fabricated for each porcelain. Specimens were glazed using their specific glaze materials. For each type of porcelain, the specimens were divided into two groups: one group was immersed in methylene blue and the other group in distilled water as a control. The surfaces were visually examined for staining without magnification. Objective color measurement was performed for each sample using a Tristimulus colorimeter. After examining the color of the glazed specimens, glazed layers were removed from the surface of the specimens to simulate an intraoral environment. Then, porcelain polishing points and diamond polishing paste were applied. The samples were immersed again in methylene blue and distilled water, and after removing from the staining solution and distilled water, visual and objective measurements were performed again.

Results: Visually discernible stain was present on the polished groups of all five porcelains immersed in methylene blue, whereas the glazed group immersed in methylene blue showed no staining. No staining was observed with glazed and polished samples immersed in distilled water. The objective evaluation showed that the polished porcelain surface of all five porcelain products had statistically significant color deviation than the glazed surface in the same group after immersion in methylene blue. The results of this study show a statistically significant difference in color stability between the polished and glazed specimens.

Conclusion: It may be concluded that the glazed specimens showed a better color stability, although the staining observed in the polished specimens was not clinically noticeable.
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http://dx.doi.org/10.1111/j.1532-849X.2007.00237.xDOI Listing
January 2008

Effect of disinfection on the dimensional stability of polyether impression materials.

J Prosthodont 2007 Nov-Dec;16(6):473-9. Epub 2007 Aug 29.

Department of Prosthodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.

Purpose: Difficulties in sterilizing impressions have led to chemical disinfection solutions as an alternative; however, some impression materials are more sensitive to humidity. For example, polyether impression materials are more hydrophilic. This study investigated the effect of three disinfecting methods on the dimensional stability of three polyether impression materials.

Materials And Methods: Three polyether impression materials (P2, Impregum Penta Soft, and Impregum Penta) were submitted to the following treatments: spray disinfectant (Mikrozid Liquid), immersion in 2% glutaraldehyde solution (Super-On), immersion in 0.525% sodium hypochlorite solution for 10 minutes, and a control group (not disinfected). Each group included five samples. After treatment, dimensional change was evaluated according to ISO 4823. The data were analyzed by 2-way analysis of variance at alpha= 0.05.

Results: The mean percentages of linear dimensional change of materials P2, Penta Soft, and Penta were -0.040%, 0.098%, and 0.100%, respectively. The dimensional change associated with different disinfectant agents mikrozid liquid, 2% glutaraldehyde, room air (control), and 0.525% sodium hypochlorite was 0.013%, 0.024%, 0.077%, and 0.096%, respectively. The interaction between the impression materials and the disinfectant treatment was not significant. The disinfectant agents can be classified in two groups as low- and high-effected. The control group did not significantly differ from either group.

Conclusion: From the standpoint of dimensional change, the disinfectants tested for 10 minutes caused no significant linear dimensional change in the polyether impression materials, compared with the control group.
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http://dx.doi.org/10.1111/j.1532-849X.2007.00235.xDOI Listing
January 2008

Effects of mesiodistal inclination of implants on stress distribution in implant-supported fixed prostheses.

Int J Oral Maxillofac Implants 2006 Jan-Feb;21(1):36-44

Department of Prosthodontics, Dentistry Faculty of Gazi University, Ankara, Turkey.

Purpose: Patterns of von Mises stress values surrounding implants supporting fixed prostheses in the posterior edentulous maxilla were evaluated using 3-dimensional finite element analysis.

Materials And Methods: Implants were placed in maxillary bone in 2 different configurations. In the first configuration, implants were placed in the first premolar, second premolar, and second molar regions; in the second configuration, implants were placed in the second premolar and second molar regions, and a mesial cantilever was extended to the space of the first premolar tooth on the superstructure. On the implant placed in the socket of the second molar, 3 different inclinations were used (0, 15, and 30 degrees). Loading was applied in the vertical, oblique, and horizontal axes.

Results: Inclination of the implant in the molar region was found to result in increased stress. Significant increase in stress on the implant embedded in the premolar region was also seen in the design with the cantilever as compared to the conventional prosthesis design.

Discussion: The stress concentrations observed at the neck of the implant were similar to results reported in the literature.

Conclusion: The highest stress value obtained in the study was 194.2 MPa with oblique loading. This value did not exceed the endurance limit of pure titanium, which is 259.9 MPa.
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April 2006