Comparative approach to analyse the effects of different surface treatments on CAD/CAM resin nanoceramics–resin composite repair bond strength

Limited data are available on the repair bond strength between computer-aided design and manufacturing (CAD/CAM) resin nanoceramics and composite repair materials. Therefore, the purpose of this study was to test the influence of several different surface treatment modalities, intermediate agents and phosphoric acid on the shear bond strength (SBS) of repair composites with water-aged CAD/CAM resin nanoceramics. Three pretreatment and four conditioning methods comprised 12 different groups. A universal testing machine was used to test the SBS. Specimens were examined with a stereomicroscope and scanning electron microscope to determine the fracture mode. The results showed that a combination of the pretreatment and conditioning methods significantly enhanced the SBS of the resin nanoceramic (p:0.001; p 0.05). This study showed that surface pretreatment in combination with a conditioning method should be used in the repair of CAD/CAM nanoceramics. The highest SBS values were achieved by grinding the surface with a diamond bur followed by silane and adhesive application, whereas the lowest values were obtained in the non-conditioned non-pretreated group

Effects of individual factors and the training process of the shade-matching ability of dental students

AbstractBackground/purposeIn this study, we evaluated the ability of dental students to correctly match tooth shades and examined the influence of clinical practice years, gender, eye color, and the use of eye glasses or contact lenses on the ability to match tooth shades.Materials and methodsIn total, 244 dental students (138 females and 106 males, with a mean age of 22 years) in their 1st to 5th years of education were included in the study. Students were asked to match the color of artificial teeth (Vitapan acrylic denture teeth) using the Vita Toothguide 3D-Master. Three predefined test colors were used: 2L1.5, 1M2, and 2R1.5. Exact matching rates of all three color components (value, hue, and chroma) were calculated and analyzed by a Chi-squared test.ResultsStudents in the 3rd, 4th, and 5th clinical years performed better with regard to exactly matching the three shades, compared to students in the 1st and 2nd preclinical years (29.4% vs. 22.5%, P = 0.034). On the other hand, gender, eye color, and use of eye glasses or contact lenses had no effect on the ability to correctly match the color. Higher rates of exact matches were found for 1M2, compared to 2L1.5 (31.1% vs. 20.5%, P = 0.007).ConclusionsThe shade-matching ability of dental students seemed to improve with more education because of the inclusion of clinical practice in the educational program. However, gender, eye color, and the use of eye glasses or contact lenses had no influence

İmplant destekli overdenture ve klasik tam protezlerin hasta memnuniyeti açısından karşılaştırılması

<p><strong>Objectives: </strong>The aims of this study were to evaluate satisfaction of patients used implant-retained overdentures and conventional complete dentures, and to investigate the effect of sociodemographic properties on satisfaction.</p> <p><strong> Materials and Methods: </strong>Forty two patients, 27 female and 15 male,<strong> </strong>used implant-retained overdentures and conventional complete dentures were included in this study, who attended to University of Yeditepe, Faculty of Dentistry in 2011. A questionnaire was prepared and distrubuted to evaluate the patient satisfaction levels about their dentures and sociodemographic properties such as age, gender, education, marital and income status. The answers were asked to give as not satisfied, satisfied, very satisfied. Chi-square test and Fisher’s Exact Chi-square test were used to analyze the quantitative data. An alpha level of 0.05 was used for all statistical analyses.</p> <p><strong> Results: </strong>The mean age of the 42 patients (64.3% female, 35.7% male) was 62.26.<strong> </strong>It was observed that<strong> </strong>patients with higher educational level prefered implant-retained overdentures, compared to conventional complete dentures. In the conventional complete denture group, higher numbers of patients were very satisfied with the cleanability compared to implant-retained overdenture group. (<em>p</em>=0.039). There was no statistically significant differences between implant-retained overdentures and conventional complete denture groups with regard to satisfaction level of esthetic, chewing, speech, retention and comfort.</p><p><strong> Conclusions: </strong>It can be concluded that sociodemographic factors did not affect the satisfaction of different denture types. The patients with conventional complete dentures were more satisfied with the cleanability, compared to implant-retained overdentures.</p> <p><strong>Keywords:</strong> Conventional complete dentures, implant-retained overdentures, satisfaction.</p><p> </p><p><strong>ÖZET</strong></p> <p><strong> Amaç:</strong> Bu çalışmanın amacı, klasik tam protez ve implant destekli tam protez kullanan hastaların memnuniyetlerini değerlendirmek ve demografik özelliklerin memnuniyet üzerine etkisini incelemekti.</p> <p><strong> Gereç ve Yöntem: </strong>Çalışmaya,<strong> </strong>2011 yılında Yeditepe Üniversitesi Diş Hekimliği Fakültesi’nde, alt-üst klasik tam protez ve üst klasik-alt implant destekli tam protez uygulanan, 27’si kadın ve 15’i erkek, toplam 42 hasta dahil edildi. Hastalara, sosyodemografik özelliklerini (cinsiyet, yaş, ömedeni durum, öğrenim durumu, gelir düzeyi) içeren ve protezlerinin memnuniyetini değerlendiren anket formları dağıtıldı. Cevapların, memnun değilim/memnunum/çok memnunum şeklinde verilmesi istendi. Niteliksel verilerin karşılaştırılmasında Ki-Kare testi ve Fisher’s Exact Ki-Kare testi kullanıldı. Anlamlılık p<0,05 düzeyinde değerlendirildi.</p> <p><strong> Bulgular: </strong>%64,3’ü kadın ve %35,7’si erkek olan toplam 42 hastanın yaş ortalaması 62,26 idi. İmplant destekli protez kullanan lise ve üzeri eğitim düzeyindeki hastaların oranının, klasik tam protezler kullananlardan anlamlı şekilde yüksek olduğu görüldü. Bu hastaların temizlenebilirlikten çok memnun olma düzeylerinin ise klasik tam protez kullanan hastalardan yüksek olduğu belirlendi (<em>p=0,039)</em>. İmplant destekli protez kullanan hastalar ile klasik tam protez kullanan hastaların estetik, çiğneme, konuşma, tutuculuk ve rahatlık memnuniyet düzeyleri arasında istatistiksel olarak anlamlı bir farklılık bulunmadı.</p><p><strong> Sonuç: </strong>Yapılan çalışmada, demografik faktörlerin her iki protez tipinin memnuniyeti üzerine etkisi olmadığı, yalnızca klasik tam protez hastalarının implant destekli tam protez hastalarına kıyasla, temizlenebilirlik açısından daha memnun olduğu belirlendi.<strong> </strong></p> <p><strong>Anahtar Kelimeler: </strong>Klasik tam protez, implant destekli overdenture, memnuniyet.<strong> </strong></p&gt

Effect of mica and glass on acrylic teeth material's color

The purpose of this study was to evaluate the effect of two different ratios of silanized mica filler and milled glass fiber reinforcement on the color of acrylic denture teeth materials. Ten acrylic resin discs made of acrylic denture teeth material (PMMA) obtained from the manufacturer were used as the control group. Four experimental groups were modified from the control group's PMMA material by adding a ratio of 5% or 10% by weight of silane-treated mica filler or milled glass fibers. Each group consisted of 10 specimens. Measurements were performed using a spectrophotometer CM-2600d, and the color changes were characterized in the Commission Internationale d'Eclairage L*a*b* color space. Delta E* values of 5% mica-, 10% mica-, 5% glass-, and 10% glass-containing sample groups were 2.46, 3.03, 2.16, and 2.59 respectively. There were statistically significant differences in L*, a*, and b* values between the control group and each test group. It was shown that when PMMA denture teeth material was modified with silane-treated mica filler or silane-treated milled glass fibers for the purpose of reinforcement, it would also cause significant changes to the original color of the material