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Öğe Comparison of the light transmission of new generation monolithic zirconia materials and lithium disilicate(Mosher & Linder, Inc, 2023) Köseler, Ege; Değirmenci, Kübra; Sarıdağ, SerkanPurpose: To compare the effects of different thicknesses of ceramic veneering on the light transmission of various monolithic zirconia and lithium disilicate materials used in esthetic restorations. Methods: Zirconia (i.e., Katana UT, Katana HT, Prozir Diamond, Prozir HT, and Zenostar MO) and lithium disilicate specimens (i.e., Emax HT and Emax MO) were prepared at thicknesses of 0.5 mm, 0.8 mm, and 1.2 mm. Additionally, 0.8 mm-thick specimens and 0.3 mm-thick ceramic veneer were prepared for veneering groups. The total transmittance of light values were measured using a spectrophotometer. The light transmission values were analyzed using the Kruskal-Wallis and the post-hoc Dunnett tests (alpha= 0.05). Results: The Emax HT group defined significant differences from all groups (P< 0.05) at all thicknesses. The mean total transmittance of light ranged from 5.53% to 19.55%. There was no significant difference between the Katana UT and Prozir Diamond groups at the 0.5 mm, 0.8 mm, and 1.2 mm thicknesses (P> 0.05).Öğe Effect of different denture base cleansers on surface roughness of heat polymerised acrylic materials with different curing process(Univ Costa Rica, Fac Odontologia, 2020) Değirmenci, Kübra; Atala, Mustafa Hayati; Sabak, CananAvoiding biofilm formation on dentures is associated with maintaining the surface properties of acrylic-based dentures. The aim of the study is to investigate the effects of two different cleaning agents (Corega and Klorhex 0.2% chlorhexidine gluconate) on surface roughness of the denture regarding efficacy of curing procedures. A total of sixty disc-shaped specimens were prepared with two different methods as long and short curing processes. The specimens were divided into subgroups according to the immersion solutions (distilled water, Corega tablet group and Klorhex 0.2% chlorhexidine gluconate group) (n=10). The samples were kept in a solution for 8 hours per day during a month. The average Ra-1 (before exposure to the cleanser agent) and Ra-2 (after exposure to the cleanser agent) of each sample was measured. A two-way ANOVA and post hoc Tukey test was used for statistical analysis. The solutions significantly increased the Ra values in both acrylic groups (p<0.001). While the effect of the distilled water group was significantly lower than Corega and Klorhex in the long-term curing group (p<0.05), no significant difference was found in the short-term curing group (p>0.05). The long-term curing time is highly effective in decreasing the surface roughness of the acrylic base material.Öğe Effect of different surface treatments on the shear bond strength of luting cements used with implant-supported prosthesis: An in vitro study(Korean Acad Prosthodontics, 2020) Değirmenci, Kübra; Sarıdağ, SerkanPURPOSE. The aim of this study was to investigate the shear bond strength of luting cements used with implant retained restorations on to titanium specimens after different surface treatments. MATERIALS AND METHODS. One hundred twenty disc shaped specimens were used. They were divided into three groups considering the surface treatments (no treatment, sandblasting, and oxygen plasma treatment). Water contact angle of specimens were determined. The specimens were further divided into four subgroups (n=10) according to applied cement types: polycarboxylate cement (Adhesor Carbofine-AC), temporary zinc oxide free cement (Temporary Cement-ZOC), non eugenol provisional cement for implant retained prosthesis (Premier Implant Cement-PI), and non eugenol acrylic-urethane polymer based provisional cement for implant luting (Cem Implant Cement-CI). Shear bond strength values were evaluated. Two-way ANOVA test and Regression analysis were used to statistical analyze the results. RESULTS. Overall shear bond strength values of luting cements defined in sandblasting groups were considerably higher than other surfaces (P<.05). The cements can be ranked as AC > CI > PI > ZOC according to shear bond strength values for all surface treatment groups (P<.05). Water contact angles of surface treatments (control, sandblasting, and plasma treatment group) were 76.17 degrees +/- 3.99, 110.45 degrees +/- 1.41, and 73.80 degrees +/- 4.79, respectively. Regression analysis revealed that correlation between the contact angle of different surfaces and shear bond strength was not strong (P>.05). CONCLUSION. The retentive strength findings of all luting cements were higher in sandblasting and oxygen plasma groups than in control groups. Oxygen plasma treatment can improve the adhesion ability of titanium surfaces without any mechanical damage to titanium structure.Öğe Evaluation of quality of life and oral hygiene attitudes of individuals using dental prostheses during the COVID-19 pandemic(Mosby-Elsevier, 2021) Değirmenci, Kübra; Kalaycıoğlu, OyaStatement of problem. The COVID-19 pandemic impacted every area of our lives, including delaying urgent dental care. However, studies evaluating how patients using dental prostheses have been affected by the pandemic are lacking. Purpose. The purpose of this study was to investigate how patients using different types of dental prostheses were being affected by the COVID-19 pandemic. Material and methods. A total of 129 randomly selected individuals from among those who had been examined in the same clinic before the COVID-19 outbreak were included in the study. The study participants were divided into 4 groups according to their type of prosthesis: complete dentures, implant-retained removable dentures, tooth-supported fixed partial dentures, and implant-supported fixed partial dentures. The Oral Health Impact Profile (OHIP-14) questionnaire was implemented by telephone interviews with the study participants, who were also asked about their concerns and steps made regarding prosthetic hygiene during the COVID-19 pandemic. Data were evaluated by the Kruskal-Wallis and post hoc Dunn tests, and multivariate logistic regression analysis with forward selection was carried out to identify predictors of the oral health-related quality of life (OHRQoL) status (alpha=.05). Results. OHIP-14 total scores did not vary significantly among the groups (P>.05). When the domain scores of OHIP-14 were considered separately, the analysis revealed that the implant-retained removable denture group had significantly poorer functional limitations when compared with the tooth-supported fixed partial denture (P=.005) and implant-supported fixed partial denture (P=.031) groups. The results of the multivariate logistic regression analysis indicated a statistically significant association between OHRQoL during the COVID-19 pandemic and the frequency of tooth or denture cleaning (1 time a day versus less than 1 time a day: P=.011; 2-3 times a day versus less than 1 time a day: P=.032). Conclusions. All prosthesis users exhibited increased interest in dental hygiene and an increase in the frequency of prosthesis cleaning during the pandemic. Furthermore, the study determined that the frequency of tooth or denture cleaning was associated with significantly improved OHRQoL during the time of the COVID-19 pandemic. Among the denture groups, those treated with implant-retained removable dentures had the poorest functional limitation in terms of OHRQoL, which can be linked to postponement of routine maintenance appointments. Therefore, providing all patients with scientifically sound information on prosthetic care during a pandemic would be highly beneficial.Öğe Evaluation of reliability of zirconia materials to be used in implant-retained restoration on the atrophic bone of the posterior maxilla: A finite element study(Korean Acad Prosthodontics, 2019) Değirmenci, Kübra; Büyükdere, Ayşe Koçak; Ekici, BülentPURPOSE. Zirconia materials have been used for implant-retained restorations, but the stress distribution of zirconia is not entirely clear. The aim of this study is to evaluate the stress distribution and risky areas caused by the different design of zirconia restorations on the atrophic bone of the posterior maxilla. MATERIALS AND METHODS. An edentulous D4-type bone model was prepared from radiography of an atrophic posterior maxilla. Monolithic zirconia and zirconia-fused porcelain implant-retained restorations were designed as splinted or non-splinted. 300-N occlusal forces were applied obliquely. Stress analyses were performed using a 3D FEA program. RESULTS. According to stress analysis, the bone between the 1) molar implant and the 2) premolar in the non-splinted monolithic zirconia restoration model was stated as the riskiest area. Similarly, the maximum von Mises stress value was detected on the bone of the non-splinted monolithic zirconia models. CONCLUSION. Splinting of implant-retained restorations can be more critical for monolithic zirconia than zirconia fused to porcelain for the longevity of the bone.Öğe Evaluation of the effect of different polyetheretherketone materials on biofilm formation: An in vitro study(Galenos Publ House, 2024) Kayaaltı, Sibel Yüksek; Atalık, Kevser; Karademir, Begüm; Sarıdağ, Serkan; Kaya, Ayşe Demet; Değirmenci, KübraObjective: The aim of this in vitro study was to investigate microorganism adhesion and biofilm formation between pure and ceramic-reinforced polyetheretherketone (PEEK) materials. Methods: A total of 72 rectangular (8 x 8 x 4 mm) samples were prepared from pure-PEEK without filler and PEEK (Ceramicreinforced PEEK - bio high-performance polymer) containing 20% nano-ceramic filler. A profilometer contact surface measurement device was used to assess the surface roughness of the samples. PEEK groups (36 pure PEEK, 36 Ceramic-reinforced PEEK) were divided into 4 sub-groups of 9 according to the microorganism strains. Staphylococcus aureus [American Type Culture Collection (ATCC 29213)], Acinetobacter baumannii (ATCC 19606), Enterococcus faecalis (ATCC 29212), and Candida albicans (ATCC 10231) standard strains were used for microbiological analysis. Blocks were added to 24-well microplates containing suspensions of microorganisms and were incubated at 37 degrees C for 72 hours. Microplates were read at a wavelength of 490 nm using crystal violet. Results: No significant difference was determined between the PEEK groups in terms of surface roughness. No significant differences in biofilm formation of S. aureus , A. baummanii , E. faecalis , and C. albicans strains were found between the PEEK groups (p>0.05). In the pure -PEEK, the highest adhesion was recorded in S. aureus (p<0.001), and the lowest adhesion in C. albicans (p<0.001). In the ceramic -reinforced PEEK group, S. aureus and A. baummanii adhesions were observed more than E. faecalis and C. Albicans (p<0.001). Conclusion: The results of this investigation demonstrated no significant differences in the biofilm formation of different strains between PEEK materials. This was a preliminary study to define the biological characteristics of ceramic -reinforced PEEK. There is a need for further comparative and clinical studies on this subject.Öğe Evaluation of the relationship between oral health, chewing ability, and degree of disease in alzheimer-type dementia patients(Güneş Kitabevi Ltd. Şti., 2021) Değirmenci, Kübra; Türel, Canan AkünalIntroduction: The objective of this study was to investigate the relationship among oral health attitudes, chewing efficiency, and the degree of disease in patients with Alzheimer-type dementia. Materials and Methods: Thirty-nine patients with Alzheimer-type dementia as the study group and 38 cognitively healthy participants as the control group were registered for this cross-sectional study. The participants' demographics and basic clinical features, oral health attitudes, and chewing efficiency scores were recorded for the analysis, and then the evaluation was done comparatively between the groups. Results: A total of 77 participants were included the study. The mean ages of the healthy (control) and Alzheimer-type dementia (study) groups were determined as 69.28 +/- 3.31 and 67.10 +/- 2.11 years, respectively. The chewing scores of the healthy and Alzheimer-type dementia groups were compared, and the scores of Alzheimer-type dementia group showed significantly lower values than the scores of the healthy group (p<0.001). Not using dentures despite tooth loss for both the mandibula and maxilla was found to be significantly higher in the Alzheimer-type dementia group than it was in the healthy group (p<0.001). Conclusion: The study showed a negative correlation between oral health attitudes, chewing efficiency, and the degree of disease in patients with Alzheimer-type dementia. Poor chewing efficiency may be related to the progress of Alzheimer-type dementia. Healthy chewing functions can support cognitive abilities. Thus, prosthetic treatment can be considered a protective factor against Alzheimer-type dementia.Öğe Hareketli Bölümlü Protez Kullanımının Kişilerin KısaDönemdeki Yaşam Kalitesine Olan Etkisinin OHIP-14 Anketiile Değerlendirilmesi: Pilot Çalışma(2021) Değirmenci, Kübra; Sabak, CananAmaç: Hareketli bölümlü protezlerin (HBP) hastaların yaşam kalitesine olan etkileri, klinikbaşarısının değerlendirilmesinde önemlidir. Bu çalışmanın amacı, sabit veya hareketli bölümlüprotez ile okluzal ilişkide olan hareketli bölümlü protezlerin hastanın yaşam kalitesine olan etkisinindeğerlendirilmesidir. Gereç ve Yöntem: Çalışma 2018 yılı Ocak-Mart ayları arasında Bolu Abant İzzet BaysalÜniversitesi Protetik Diş Tedavisi Anabilim Dalı’nda en az bir çenesine hareketli bölümlü protezyaptıran 41 hasta üzerinde gerçekleştirildi. Katılımcılara OHIP-14 soruları sorularak hareketlibölümlü protezleri ile ilgili memnuniyetleri değerlendirildi. Elde edilen sonuçlar hareketli bölümlüprotezin karşısında bulunan protez şekli, cinsiyet, eğitim durumu, gelir ve ağız sağlığıalışkanlıklarına göre değerlendirildi. Kruskall-Wallis ve Mann-Whitney U testleri verilerin istatikselanalizinde kullanıldı. Bulgular: Çalışmanın sonuçlarına göre, cinsiyet, eğitim durumu ve ağız sağlığı alışkanlıklarınınkatılımcıların OHIP-14 skorları üzerine bir etkisi bulunmamıştır (P>0.05). HBP/Doğal diş-sabitproteze sahip katılımcılar ile HBP/HBP protez çiftine sahip katılımcıların OHIP-14 skorlarıkarşılaştırıldığında psikolojik huzursuzluk, fiziksel yetersizlik, psikolojik yetersizlik, sosyaluyumsuzluk ve engellilik kategorilerinde anlamlı farklılıklar belirlenmemiştir (P>0.05). Bununlaberaber, fonksiyonel kısıtlılık ve fiziksel ağrı kategorisindeki skorlar HBP/HBP grubunda anlamlıderecede daha yüksek bulunmuştur (P<0.05). Sonuç: Her iki çenede HBP bulunan hastaların fiziksel ağrı ve fonksiyonel kısıtlama problemleriyaşama ihtimali, tek çenesinde HBP bulunan hastalara göre daha yüksektir.Öğe Influence of anodized titanium abutment backgrounds on the color parameters of different zirconia materials(NLM (Medline), 2021) Değirmenci, Kübra; Sarıdağ, SerkanPURPOSE: To characterize the color outcome on different zirconia types of various colored titanium backgrounds produced with a newly developed anodized technique. METHODS: Blue, green, pink and gold-colored titanium backgrounds were produced via different anodization voltage values. Non-anodized grey colored titanium was used as a control. A total of 40 disc-shaped zirconia specimens were prepared from four different zirconia types (Cercon HT, Noritake Alliance, Prettau, and Ice Zirkon). The zirconia specimens were placed on different titanium backgrounds to evaluate color differences (?E) by recording the L, a and b values. ?E, ?L, ?a and ?b values were compared for different titanium backgrounds and zirconia types. To analyze the results, repeated measures ANOVA and Bonferroni adjustments for pairwise comparison were used (?= 0.05). RESULTS: The Cercon HT group had the highest ?E value, while the Noritake group showed the lowest ?E value (P< 0.05). ?L, ?a and ?b values showed significant color changes depending on the color of the titanium background, the sintering procedure of zirconia and the zirconia ingredients (P< 0.05). CLINICAL SIGNIFICANCE: Anodized titanium abutments may improve color in esthetic regions when a ceramic abutment cannot be used. The study showed that the gold-colored titanium produced via anodization was better than other colors at producing a tooth-like color for implant-supported zirconia restorations. Also, by adjusting the color of zirconia restorations, the effect of the background could be altered using the zirconia sintering protocol.Öğe Kısa Dental İmplantların Klinik Çalışmalar Üzerinden Değerlendirilmesi(2018) Atala, Mustafa Hayati; Değirmenci, KübraKaybedilen doğal dişlerin yerine dental implantlar başarıyla uygulanmaktadır. Ancak, aşırı kemik kaybı standart implant uygulamaları öncesinde ileri cerrahi işlemler gerektirebilmektedir. Son dönemde ileri cerrahi işlemlerin dezavantajlarından kaçınmak için kısa implantların kullanımı değerlendirilmektedir. Etkili ve pratik bir çözüm olan kısa implantların klinik başarıları araştırılmaktadır. Çalışmalarda implantların yüzey özelliği, kemik yapısı, marjinal kemik kaybı, kron/implant oranı, implant üstü restorasyonların tasarımı ve periodontal yapıların sağlığı gibi başlıca faktörler değerlendirilmektedir. Klinik çalışmaların dikkate alındığı bu derlemede, kısa implantlar ve söz konusu faktörlerin kısa implantların başarısına olan etkileri tartışılacaktır.Öğe SABİT PROTETİK RESTORASYONLARIN SÖKÜM NEDENLERİNİN KİŞİLERİN YAŞAM KALİTESİ ÜZER?NE ETKİSİNİN DEĞERLENDİRİLMESİ(2020) Değirmenci, Kübra; Atala, Mustafa Hayati; Ankaralı, HandanAmaç: Ara?tırmamızda çe?itli sebeplerle çıkarılması gereken sabit protetik restorasyonların ba?arısızlık nedenleri, kullanım süreleri, çıkarılma yöntemi ve son 6 ayda ki?inin günlük hayatına nasıl etkilediğinin değerlendirilmesi amaçlanmı?tır.Gereç ve Yöntem: Ara?tırma ya?ları 28-72 (47,6±10,1) arasında deği?en 144 katılımcı (86 kadın; 58 erkek) üzerinde gerçekle?tirildi. Çalı?mamızda 143(%99,3) tane metal destekli porselen restorasyon, 1 tane (%0,7) tam metal restorasyon değerlendirildi. Demografik veriler, sabit protetik restorasyonun söküm nedeni, Ante kural’ına uygunluğu, söküm yöntemi, üye sayısı, kullanım süresi, yapıldığı materyal, sökümünü isteyen bölüm ve hastaya yöneltilen Oral Sağlığın Günlük Hayata Etkisini Ölçen ?ndeks (OIDP) soruların cevaplarıara?tırma formuna kaydedildi.?statiksel değerlendirme için yüzdelikler ve Fisher-Freeman-Haltoon testleri kullanıldı.Bulgular:Ara?tırmada toplam 144 adet sabit protetik restorasyon değerlendirildi. Söküm nedenleri değerlendirildiğinde, destek di?te ağrı (%38,2), periodontal dokularda sorun(%20,1) ve restorasyonun yenilenmesi(%15,3) en çok görülen ilk üç sebep olarak belirlendi. Gruplar arasında OIDP sorularının cevapları değerlendirildiğinde i?/çalı?ma ya?amı ile psikolojik durum dı?ındaki değerlendirmeler açısından anlamlı bir farklılık bulunamadı.Sonuç:Sabit protetik restorasyonların çıkarılma sebepleri arasında destek di?te ağrı en çok görülen sebeptir. Ante kuralını sağlayan ve sağlamayan restorasyonlar, görülen ba?arısızlık nedenleri açısından kar?ıla?tırıldığında arada anlamlı bir fark belirlenememi?tir. Sabit protetik restorasyonlarda ba?arının değerlendirilmesinde Ante kuralı ile beraber hastaya bağlı faktörler, di?in preparasyonu ve restorasyonun yenilenme sayısı gibi diğer faktörlerin de ara?tırılması gerekir.Öğe TAM PROTEZ KULLANMAYA BAŞLAYAN HASTALARIN HAYAT KALİTESİNİN VE ÇİĞNEME ETKİNLİĞİNİN İNCELENMESİ(2018) Büyükdere, Ayşe Koçak; Değirmenci, Kübra; Özgür, Bahar OdabaşıAmaç: Tam protezler ile kaybedilen çiğneme fonksiyonun kazanılması amaçlanır. Tam protezlere adaptasyon kişiden kişiye değişir ve hastaların yaşam kalitelerini etkilemektedir. Ağız sağlığı önemi profili [Oral Health Impact Profile (OHIP)], genel ağız sağlığı değerlendirme indeksi [General Oral Health Assessmnet Index (GOHAI)], ve günlük aktivitede ağız sağlığının önemi [Oral Impact on Daily Performance (OIDP)] anketleri yaşam kalitesini belirlemede sıklıkla kullanılmaktadırlar. Çiğneme etkinliği de tam protezlerin başarısında ve protezlere alışılmasında önemli bir değerlendirmedir. Bu çalışmada hastaların tam protezlere alışma döneminde yaşam kalitesinin, çiğneme etkinliği ile beraber değerlendirilmesi amaçlanmıştır. Gereç ve Yöntem: Bu pilot çalışma 2015 yılında Kocaeli Üniversitesi Diş Hekimliği Fakültesi Protetik Diş Tedavisi kliniğinde tam protez yaptıran 42 hasta üzerinde gerçekleştirildi. Yeni tam protez yapılan hastalara OHIP, GOHAI, OIDP anket soruları ilk gün, 24 saat, 1 hafta, 1 ay ve 3 ay sonraki kontrollerde sorulmuştur. Çiğneme etkinliğini belirlemek için de her seansta 20 ve 50 siklustan olmak üzere çift renk sakız çiğneme testi yapılmıştır. ?statiksel analiz bilgisayar destekli SPSS programında anketler Repeated Measure Anova ve Bonferroni testleri ile değerlendirilmiştir. Çiğneme testi için Ki-Kare testi kullanılmıştır. Bulgular: OHIP, GOHAI, OIDP sonuçlarında ilk takıldıklarında, 1. günde, 1. haftada, 1. ay arasında anlamlı fark bulunmuştur. Birinci ay ve 3. ay arasında sadece OHIP’te anlamlı fark varken. GOHAI ve ODIP arasında anlamlı fark yoktur. Çiğneme etkinliği her seansta istatistiksel olarak artmıştır. Sadece ilk takıldığı an ve 1. gün arasında anlamlı fark yoktur. Sonuç: Hastaların gelirleri ve eğitim durumları protez seçimini etkiler. Fiziksel olarak tam proteze adaptasyonları bir ay içinde çoğunlukla gerçekleşmektedir. Psikolojik adaptasyonu üç aya kadar sürmektedir. Çiğneme etkinliği kullanımla beraber artmaktadır.
