Person: YILMAZ, BERZA
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Publication Open Access Evaluation of apical root resorption in Class III patients who received one-or two-phase orthodontic treatment(2021-04-01T00:00:00Z) YAĞCI, AHMET; ŞEKER, Elif Dilara; YILMAZ, BERZA; ŞEKER, ELIF DILARA; YILMAZ, BERZAObjectives: The aim of this study was to compare the incidence root resorption and dilaceration between the patients with and without previous orthopedic treatment after the fixed orthodontic treatment.Publication Open Access Voice changes after surgically assisted rapid maxillary expansion(2022-01-01T00:00:00Z) Erdur, Onur Erdem; YILMAZ, BERZA; YILMAZ, BERZAIntroduction: This study aimed to investigate voice changes in patients who had surgically assisted rapid maxillary expansion (SARME). Methods: Nineteen adult patients with maxillary transverse deficiency were asked to pronounce the sounds -[a], [epsilon], [(sic)], [i], [(sic)], [oe] [u], [y]- for 3 seconds. Voice records were taken before the expansion appliance was placed (T0) and 5.8 weeks after removal (T1, after 5.2 months of retention). The same records were taken for the control group (n = 19). The formant frequencies (F0, F1, F2, and F3), shimmer, jitter, and noise-to-harmonics ratio (NHR) parameters were considered with Praat (version 6.0.43). Results: In the SARME group, significant differences were observed in the F1 of [a] (P = 0.005), F2 of [epsilon] (P = 0.008), and [oe] sounds (P = 0.004). The postexpansion values were lower than those recorded before. In contrast, the F1 of [y] sound (P = 0.02), F2 of [u] sound (P = 0.01), the jitter parameter of [(sic)] and [i] sounds (P = 0.04; P = 0.002), and the NHR value of [epsilon] sound (P = 0.04) were significantly than the baseline values. In the comparison with the control group, significant differences were found in the F0 (P = 0.025) and F1 (P = 0.046) of the [u] sound, the F1 of the [a] sound (P = 0.03), and the F2 of the [epsilon] sound (P = 0.037). Significant differences were also found in the shimmer of [i] (P = 0.017) and [(sic)] (P = 0.002), the jitter of [epsilon] (P = 0.046) and [i] (P = 0.017), and the NHR of [i] (P = 0.012) and [(sic)] (P = 0.009). Conclusion: SARME led to significant differences in some of the acoustics parameters.Publication Open Access Is a Single Rinse Effective on Evacuating the Residual Monomers After Orthodontic Bonding? An In Vivo Study(2021-04-01T00:00:00Z) Gorukmez, Erhan; YILMAZ, BERZA; Ramoglu, Sabri Ilhan; YILMAZ, BERZAObjective: Orthodontic adhesives are known to release potentially harmful bio-chemicals such as Bisphenol A, a derivative from Bisphenol-A-Glycidyl-Methacrylate (Bis-GMA). The aim of this study was to evaluate the amount of Bis-GMA released after the use of orthodontic adhesives polymerizing chemically or with light. We also aimed to check whether a single rinse is effective on evacuating all the residual monomers. Methods: Light curing (Transbond XT, Unitek, CA, USA and Opal Seal Ultradent, Utah, USA) and chemically curing adhesives (Rely-a bond, Reliance Orthodontic Products, Inc., USA and Unite, 3M/Unitek, CA, USA) were used to bond upper and lower braces of 48 patients. Patients gargled 25 mL drinking water for 1 minute; before bonding (T0), immediately after bonding (T1) and immediately after the first rinse (T2). The samples were placed in amber colored glass bottles, preserved in -20 degrees C and filtered through a 0.45-micron filter and analyzed with Liquid Chromatography Tandem Mass Spectrometry. Results: Bis-GMA release was recorded with all the adhesives. Higher amount of residual monomer was recorded for the light curing composite adhesives; Transbond XT and Opal Seal, followed by chemically curing; Unite and Rely-a bond. There was no statistically significant difference in Bis-GMA concentration at T1 and T2 (p>0.05). Conclusion: Significant release of Bis-GMA was observed following orthodontic bonding with either light or chemically curing adhesives. No significant difference was recorded between the first and the second rinses following bonding, meaning that a single rinse may not be effective in evacuating all the residual monomers.Publication Open Access Structural and mechanical analysis of three orthodontic adhesive composites cured with different light units(2020-04-01T00:00:00Z) YILMAZ, BERZA; BAKKAL, MELTEM; Kurt, BELMA; YILMAZ, BERZA; BAKKAL, MELTEM; ZENGİN KURT, BELMAObjective: To evaluate the effects of three different curing units on the physical and mechanical features of three different orthodontic adhesive resin materials. Material and Methods: 45 specimens (5 mm in diameter, and 2 mm in thickness) of each of the three different adhesive composite resin materials (Transbond XT, Grēngloo™ Adhesive and Light Bond Paste) were cured with three different light units (a polywave third generation (Valo), a monowave (DemiUltra), and a second-generation LED (Optima 10)). To quantify degree of conversion (DC), the Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy was used in transmission mode (ALPHA FT-IR Spectrometer, Bruker Optics, Germany). Vickers hardness value was recorded under constant load 100 g for 10 s with a microhardness tester (HMV M-1, Shimadzu Corp., Kyoto, Japan). The data were statistically analyzed using Kruskal-Wallis and chi-square tests. The level of significance was considered p<0.05. Results: The highest DC values were obtained as a result of curing with Optima 10. This rate was followed by Demi Ultra and Valo, respectively. Transbond XT samples showed a lower level of conversion than the samples of Light Bond Paste and Grēngloo™ Adhesive. The top surfaces of each material showed higher hardness values than the bottom surfaces (p<0.05). The Light Bond Paste showed the highest hardness values both on the top and bottom surfaces among the three materials, followed by Grēngloo™ Adhesive. While the hardness values of the top surfaces of the samples cured with Demi Ultra and Valo light units were similar, higher hardness values are recorded with Valo on the bottom surfaces (Valo; 85.200/75.200 (top/bottom) versus Demi Ultra; 86.100/66.000 (top/bottom)). Conclusions: The different DC and the surface hardness properties were recorded for the resin as orthodontic adhesives depending on different light units. Shorter radiation time caused lower DC and surface hardness values.Publication Open Access The Accuracy of Information about Orthodontics Available on the Internet(2018-12-01T00:00:00Z) Yilmaz, Borza Sen; YILMAZ, BERZAObjective: The aim of the present study was to evaluate the content of the informative websites related to orthodontic terms in Turkish and in English. Methods: Five different orthodontic terms ("orthodontic appliances (ortodontik aygıtlar)," "orthodontic braces (ortodontik braketler)," "orthodontic elastics (ortodontik elastikler)," "orthognathic surgery (ortognatik cerrahi)," and "orthodontic treatment (ortodontik tedavi)") both in Turkish and in English were searched using Google. There were 25 websites evaluated for each term. A total of 137 different websites were evaluated with three measurement tools: DISCERN (questionnaire, University of Oxford, 1999) (quality of information), LIDA (v1.2 Minervation, 2007) (accessibility, usability, and reliability), and AChecker (v0.1 ATutor, 2011) (accessibility). Results: The mean overall score of the quality of information was "good" for terms in Turkish and in English. The LIDA score was classified as "moderate" for terms in Turkish and in English. More accessibility errors were found on the Turkish websites than on the English counterparts. Most of the statistical evaluations between Turkish and English terms were insignificant. However, intragroup evaluation of the terms mostly showed significant differences. Conclusion: Accessibility, usability, and reliability; quality of information; and scores of access errors showed variations among Turkish and English sites. The collaboration of website designers and clinicians to increase the quality level of the websites is recommended.Publication Open Access Polymerization characteristics of colored compomers cured with different LED units(2019-02-01) Durmus, ZEHRA; Yilmaz, BERZA; Bakkal, MELTEM; Durmus, Ali; Ozalp, Serife; BAKKAL, MELTEM; YILMAZ, BERZA; ÖZDEMİR, ŞERİFEAim: Incomplete polymerization of a resin material used for dental restoration affects the properties of the restoration. We evaluated the structural and mechanical properties of three different colored compomers cured with three different LED units to observe the characteristic changes occurring in different matches. Methods: Polytetrafluoroethylene molds (5 mm in diameter and 2 mm in thickness) were used to prepare disk-shaped sample specimens. Nine sample groups (each of five specimens) were prepared, three each of different compomer resin colors (gold, berry, and silver). Samples were cured using three different LED units (Optima, VALO, and Demi Ultra), according to the manufacturers’ instructions. Microstructural properties of samples were characterized by determining the degree of curing using Fourier-transform infrared spectroscopy and by analyzing sample morphology under a scanning electron microscope. The Vickers hardness, compressive strength, and elastic modulus of the samples were measured to investigate their mechanical properties. Results: The degrees of curing decreased in the order of silver > berry > gold for all curing units. Conversely, gold compomers exhibited poorer mechanical values than the berry and silver counterparts. The Optima 10 unit yielded slightly higher degrees of curing than the other devices, followed by Demi Ultra and VALO light-curing units, respectively. Conclusion: The resin color affected the structural and mechanical properties of the compomers, possibly as a result of the complex interactions and relationships between the irradiation light and resin material, such as light absorbance and reflectance; thus, depending on the color as well as the curing protocol.Publication Open Access Evaluation of Initial Stress Distribution and Displacement Pattern of Craniofacial Structures with 3 Different Rapid Maxillary Expansion Appliance Models: A 3-dimensional Finite Element Analysis(2021-03-01T00:00:00Z) Sucu, Merve; Yılmaz, Berza; Ramoğlu, Sabri İlhan; YILMAZ, BERZAObjective: This study aimed to describe the displacement of anatomical structures and the stress distributions caused by the Hyrax, fan-type, and double-hinged expansion screws via the 3-dimensional (3D) finite element method (FEM). Methods: The 3D FEM was based on the computed tomography data of a 12-year-old patient with a constricted maxilla. The Hyrax model included 1,800,981 tetrahedral elements with 2,758,217 nodes. The fan-type model included 1,787,558 tetrahedral elements with 2,737,358 nodes. The double-hinged model included 1,777,080 tetrahedral elements with 2,722,771 nodes. The von Mises stress distributions after 0.2 mm of expansion and displacement patterns after 5 mm of expansion were evaluated. Results: The highest stress accumulation was observed in the sutura zygomatico maxillaris area with all 3 appliances. An increase in stress was noted at the pterygomaxillary fissure, the medial and lateral pterygoid process of the sphenoid bone, and the nasal areas. The wedge-shaped skeletal opening was observed with all 3 appliances. In the transverse plane, maximum posterior expansion was achieved with the Hyrax appliance, whereas the maximum anterior expansion was observed with the double-hinged appliance. The maxilla moved inferiorly and anteriorly with all the 3 appliances. The greatest inferior displacement of the maxilla was recorded with the Hyrax appliance, whereas anterior maxillary displacement was the greatest with the double-hinged appliance. Conclusion: All the appliances showed similar stress distributions. The use of double-hinged screw caused a slight anterior displacement of point A. The fan-type and double-hinged appliances were shown to be more effective on anterior maxillary constriction, whereas the Hyrax appliance might be chosen for resolving maxillary posterior constriction.Publication Open Access Orthodontics-Surgery-Prosthodontics Teamwork(2016-08-01T00:00:00Z) Sen Yilmaz, Berza; Kucukkeles, Nazan; Cakirer Bakkalbasi, Banu; Guzel, Mehmet Zeki; YILMAZ, BERZAThe consciousness and expectations of orthodontic patients have evolved with the increasing esthetic requirements of the society. Therefore, interdisciplinary intervention is crucial to achieve better results. A 19-year-old female patient presenting with posterior cross-bite, anterior open-bite, and laterognathia applied for treatment with the chief complaint of her unpleasant general facial appearance. The treatment plan included surgically assisted rapid maxillary expansion (SARME), double jaw surgery, and prosthetic restoration of the anterior teeth. The corticotomy was performed under general anesthesia and was followed by SARME. After leveling, stainless steel wires were placed, and Class II elastics were used for the decompensation of incisor teeth inclination. During surgery, maxillary advancement and mandibular set back were performed. The laterognathia was corrected with the rotation of the maxilla and bone removal from the hypertrophic side of the mandibular corpus. Following the removal of the orthodontic appliances, home bleaching and prosthodontic rehabilitations were performed. The patient ended up with the ideal facial criteria and an esthetic smile after 18 months of treatment.