Aim: The aim of this study is to evaluate the discolouration resistance of attachments made of composites having different physical properties, filler ratios and viscosity through the simulated environment and conditions.Materials and Methods: Seventy‐two extracted human teeth were aligned to simulate upper and lower dental arches. The attachments were prepared according to the guides determined by ClearCorrect. Three different composite groups were used for attachments preparation: Aligner Connect, G‐Aenial Universal Injectable, and Tetric Prime and Tetric Evoflow combination. Dental models and aligners were kept in artificial saliva throughout the experiment of 96 weeks. The aligners were also subjected to 2308 thermal cycles and insertion and removing procedures 840 times for each period of 12 weeks. Afterwards, the models were kept in coffee and red wine solutions. Colour measurements were made with Vita Easy Shade 4.0 at 12th, 24th, 48th and 96th simulated weeks.Results: No significant difference in discolouration was observed during thermal cycle application of 12th and 24th week experimental periods. In the later periods, discolouration was observed in the composite materials, and G‐Aenial Universal Injectable was less coloured than the other samples. The composite samples were more coloured in proportion to their residence time. The G‐Aenial Universal Injectable was more affected by wine solution, and Tetric Prime and Tetric Evoflow combination were more affected by coffee solution.Conclusions: Viscosity, resin matrix content and nature of inorganic filler particles of the composite materials significantly affect the colour changing properties of them due to the long‐term ageing and exposure to colouring agents.

This study was performed to evaluate the effect of different decontamination protocols applied to contaminated surfaces on the recovery of adhesion. Different decontamination protocols were applied to molar teeth contaminated with blood and saliva except the control group. 40 third molar teeth were divided into groups according to the applied decontamination protocols: Group 1(control), Group 2 (water rinse), Group 3 (15-sec re-etch), Group 4 (10-sec re-etch), Group 5 (5-sec re-etch), Group 6 (5% NaOCl), Group 7 (2% chlorhexidine gluconate), Group 8 (ozonated water). Universal adhesive resin (Gluma Universal, Heraus Kulzer) was used in the etch and rinse mode according to the manufacturer’s instructions. Nanohybrid composite material was placed in all groups. Then the Shear Bond strengths of all groups were evaluated after applying 5000 thermal cycles (5–55 °C) to each sample. In the limitation of this in vitro study, it has been shown that rinsing with ozonated water of contaminated surfaces with blood and saliva after etching, has increased the micro-shear bond strength (μSBS) values more than that of in control group values. Also, the application of NaOCl, re-etching with 37% phosphoric acid for 15 seconds, and cleaning with CHX, significantly increase the bonding potential.

Çürük, travma, restorasyonlar, erozyon, atrizyon ve abrazyon gibi birçok faktöre bağlı olarak çok fazla madde kaybı olan ve endodontik tedavi sonrası daha da zayıflayan dişlerin nasıl restore edileceği her zaman bir sorun olmuştur. Endodontik tedavili dişlerin post ve kor sistemleri ile restorasyonu diş hekimliği pratiğindeki en riskli işlemlerden biridir. Endodontik tedavi geçirmiş bir dişin restoratif ve protetik tedavisi, kalan sağlıklı dokuların miktarına, uygulanan kor restorasyonunun prognozuna, kor yapısına destek olan post çeşidine ve post yüzeyine tutuculuğu artırmaya yönelik yapılacak işlemlere, restorasyonun genel olarak yapısal ve estetik kalitesiyle, klinik adaptasyonuna bağlıdır. Günümüzde estetik beklentilerin artması ve adeziv sistemlerin gelişmesiyle birlikte post kor sistemlerinin seçenekleri artmıştır. Giderek artan estetik ve biyolojik olarak uyumlu maddelere olan talep, metal olmayan post kor sistemlerinin geliştirilmesine yol açmıştır. Fiberle güçlendirilmiş sistemler daha çok kullanılmaya başlamıştır. Bu derlemede, restorasyonların ağızda kalma oranı ve en yaygın başarısızlık tipleri açısından, döküm post kor ve fiber postlar ile ilgili retrospektif ve prospektif klinik çalışmalar gözden geçirildi. Buna ilave olarak yüzey işlemlerinin post sistemlerinin retansiyon başarısı üzerine etkileri ve yeni bir post kor sistem olan yüksek performanslı polimer PEKK (polyetherketoneketones)'in üzerinde durulmuştur. Bu derlemenin amacı; madde kaybı çok fazla olan endodontik tedavili dişlere uygulayacağımız tedaviye karar vermekte diş hekimlerine yardımcı olmaktır.It has always been a problem to restore teeth that have lost too much tissue due to many factors such as caries, trauma, previous restorations, erosion, attrition and abrasion, and even weakened after endodontic treatment. The restoration of endodontically treated teeth with post-core systems is one of the most risky procedure in dental practice. Restorative and prosthetic treatment of a tooth that has undergone endodontic treatment generally depends on the amount of remaining healthy tissue, the prognosis of the applied core restoration, and the clinical adaptation of the restoration with structural and aesthetic qualities. Nowadays, with the increase of aesthetic expectations and the development of adhesive systems, the choice of post-core systems has increased. Demand for increasingly aesthetically and biologically compatible materials has led to the development of non-metallic post-core systems. Fiber-reinforced systems have started to be incorporated into routine clinical care more frequently. In this survey, retrospective and prospective clinical studies dealing with cast-post-and core and fiber posts were reviewed regarding the rate of survival of restorations and the most prevalent failures. In addition,, the impacts of surface treatments on the retention success of post systems and a new post core sysytem named high performance PEKK (polyetherketoneketones) have been mentioned. The aim of this review; was to assist dentists in deciding the treatment to be applied to endodontically treated teeth with too much substance loss.

Objective: To examine the awareness of Turkish athletes about mouthguard use and to make mouthguard use routine. Methods: This cross-sectional study is aimed to determine the knowledge about the advantage of mouthguard use of athletes. Participants over the age of 18 who answered all questions were included in this study. Those who refused to participate in the survey were excluded. A face-to-face survey including 10 questions was made. The questionnaire were given on a day and collected the next day. Results: There was a significant difference between protection awareness and use of Mouthguard (P

OBJECTIVE: To report on the level of knowledge of people about Covid-19 symptoms, transmission routes and personal protective equipment use during the Covid-19 pandemic normalization process, to determine the health institutions they will prefer for dental treatment. MATERIALS AND METHODS: A total of 226 individuals aged 18 and over who went to dental institutions like dentsitry of faculties, dental clinics, public and private hospitals at least once in the last 2 years participated in this survey. RESULTS: The range with the highest number of participants is the 20-30 age group; university graduated, small family and a household of 3 people. Participants have a high level of knowledge about Covid-19 symptoms and transmission routes (p=0,001). Surgical masks(94%), hand disinfectants(95%) are the most common measures taken for Covid-19, while N95(24%) and visor(21%) are used the least. No significant relationship was found between socio-demographic characteristics and the level of knowledge about Covid-19 symptoms and transmission routes, and the use of personal protective equipment (p>0,05). Dentsitry of faculties monitor body temperature and mask use, and dental clinics monitor the use of masks more carefully than other health institutions (p=0,05). Among the reasons for the preference of health instutiations the precautions taken regarding the epidemic were not preferred,but only the ease of transportation(p=0,02) and financial reasons(p=0,00) were effective. 46% of the participants are aware of the measures taken by health institutions against Covid-19. CONCLUSION:Participants have sufficient knowledge about the transmission routes and symptoms of Covid-19. The Covid-19 pandemic was not effective in determining the health institution they would prefer.