Seramik restorasyonların mikrosızıntısı üzerine yüksek yoğunluklu LED işık kaynağı mesafesinin değerlendirilmesi

Amaç: Rezin simanla yapıştırılmış IPS e.max Press slot kavite restorasyonlarının; iki farklı yüksek yoğunluklu LED ışık kaynağı ile ve 0 ve 9 mm uzaklıktan mikrosızıntılarının değerlendirilmesidir. Gereç ve Yöntemler: Bu çalışmada 48 adet çekilmiş insan premoları kullanılmıştır. Dişlerin aproksimal yüzeylerinde inley preparasyon seti (Komet, Germany) kullanılarak slot kaviteler oluşturulmuştur. IPS e.max Press (Ivoclar Vivadent AG, Liechtenstein) seramik inley restorasyonlar hazırlanmıştır. İki farklı LED ışık kaynağı yüksek güç yoğunluklu LED (HPIL; Demi Ultra) ve yüksek yoğunluklu LED (HIL; Valo Cordless) dual cure rezin simanı polimerize etmek için kullanılmıştır (NX3 Nexus, Kerr). Işık kaynağının ucu ile restorasyon arasındaki mesafe 0 ve 9 mm olarak ayarlanıp ve plastik halka kullanılarak kontrol edilmiştir. Dişler rastgele olarak 4 gruba ayrılmıştır. Grup 1: HPIL ışık kaynağı ile restorasyon arasında mesafe yok, Grup 2: HIL ışık kaynağı ile restorasyon arasında mesafe yok, Grup 3: HPIL şık kaynağı ile restorasyon arasında 9 mm mesafe bulunmakta, Grup 4: HIL ışık kaynağı ile restorasyon arasında 9 mm mesafe bulunmaktadır. Polimerizasyon işleminden sonra, örnekler 5 ve 55 ˚C arasında, her bir haznede 30 s kalacak şekilde 5000 termal siklusa tabi tutulmuştur. Örnekler tırnak cilasi ile kaplanmış, % 0.5’lik bazik fuksinde 24 saat bekletilmiş, dişler ikiye bölünmüş, stereomikroskop altında incelenmiş ve gingival marjindeki mikrosızıntı skorlanmıştır. Kruskal-Wallis ve Mann-Whitney U-tests kullanılarak istatistiksel analiz yapılmıştır. Bulgular: Çalışmanın sonucunda grup 1, 2 ve 3 arasında istatiksel bir fark gözlenmezken (p > 0.05), grup 4’ün mikrosızıntı değeri diğer tüm gruplardan daha yüksek bir değer göstermiştir (p < 0.05). Sonuçlar: Restorasyon yüzeyinden, HIL ışık kaynağının mesafesinin artması diş ve restorasyon arasında mikrosızıntının artmasıyla sonuçlanmıştır

Protetik tedavilerde lazerlerin kullanımı

Bu çalışmanın amacı lazer teknolojilerinin protetik tedavilere nasıl entegre edilebileceğini ve diş hekimliğinde kullanılan materyaller üzerindeki etkilerini tartışmaktır. Bu derleme, protetik tedavide kullanılan lazer çeşitlerini, lazer parametrelerini ve bunların materyaller olan etkileşimlerini inceleyen bilimsel çalışmaları kapsamaktadır

Bilgisayar destekli diş hekimliği ve güncel CAD/CAM sistemleri

<p>CAD/CAM systems (computer aided design/computer aided manufacturing) has been used in dentistry since 1987. In the past 25 years, development of various high quality chairside and laboratory CAD/CAM systems has been continued with the progress of technology. This article describes currently used CAD/CAM systems.<strong> </strong></p> <p><strong>Keywords:</strong> Dental, CAD/CAM systems.</p><p> </p><p><strong>ÖZET</strong></p> <p>CAD/CAM sistemleri (bilgisayar destekli tasarım/bilgisayar destekli üretim) diş hekimliğinde 1987 yılından beri kullanılmaktadır. Son 25 yılda teknolojinin de ilerlemesiyle üstün özellikte çeşitli klinik ve laboratuvar CAD/CAM sistemleri geliştirilmeye devam etmektedir. Bu makalede günümüzde kullanılan CAD/CAM sistemleri anlatılmaktadır.<strong></strong></p&gt

Influence of desensitizing procedures on adhesion of resin cements to dentin

WOS: 000396765300007This study evaluated the effect of two desensitizer agents with different contents and Nd:YAG laser irradiation on the shear bond strength (SBS) of adhesive resin cements to dentin. New treatment options of Nd:YAG laser irradiation and tetracalcium phosphate-containing agent applications were compared with routinely used glutaraldehyde-containing agents. One hundred and twenty human, caries-free premolars were embedded in acrylic resin blocks 2 mm below the cementoenamel junction. Buccal surfaces of the teeth were ground to expose dentin. The specimens were randomly assigned into three different surface treatments (desensitizing agents, Nd:YAG laser) and the control, then into three different adhesive resin cement applications (n = 10). Resin cements (Panavia SA cement (PA), Panavia SA cement with Clearfil Universal Bond (PACU), and Multilink N (MN)) were applied to the conditioned teeth surfaces using Teflon tubes. The specimens were thermocycled (5000 cycles, 5-55 +/- 1 degrees C, dwell time 30 s). The SBS test was performed in all groups. The results were submitted to two-way ANOVA and Tukey HSD tests (p < .05). Further, SEM analysis was performed on the dentin surfaces. SBS values were significantly difference among the surface treatment groups and also among adhesive resin cement groups (p < .05). The specimen cemented with PA showed lower SBS values than PACU- and MN-applied specimens. The highest SBS value was obtained in the Nd:YAG laser group which was cemented with PACU cement. The lowest SBS value was obtained in the control group which was cemented with PA cement. In addition, SEM evaluation revealed that desensitizing agents and Nd:YAG laser occluded dentin tubules

Color Change of Different Dual-Cure Resin Cements After Thermocycling

The purpose of this study is to evaluate the effect of thermocycling on the color change of the amine-free dual-cure resin cements. IPS e.max CAD blocs were cut into specimens of 1 mm thickness (N=28) and cemented with one of the 4 different amine-free dual-cure resin cements (NX3 Nexus [NX], Kerr Dental; Variolink Esthetic DC [VE], Ivoclar Vivadent; Panavia V5 [PV], Kuraray Dental; G-CEM Linkforce [GC], GC Corporation) (n=7). A spectrophotometer was used for color measurements. Specimens were subjected to thermocycling (5°C and 55°C; 5000 and 10000 cycles). Normality of data distribution was tested by using the Kolmogorov-Smirnov test. Statistical analysis was performed using a two-way analysis of variance (ANOVA) and Tukey’s multiple comparison tests at a significance level of p0.05).  There were no statistically significant differences between the ∆E0 and ∆E1 values of the GC group, however the other groups were affected after 10000 thermocycling (p>0.05). Amine-free resin cements used for cementation showed color change after thermocycling except GC group. All resin cements were showed clinically acceptable color change after thermocycling (∆E 0.05). No hubo diferencias estadísticamente significativas entre los valoresn∆E0 y ∆E1 del grupo GC, no obstante, los otros grupos se vieron afectados después de 10000 termociclos (p>0.05). Cementos de resina libres de aminas. utilizados para la cementación mostró cambio de color después del termociclaje, excepto el grupo GC. Todos los cementos de resina mostraron un cambio de color clínicamente aceptable después del termociclaje (∆E<3.5)

Evaluation of the bond strength between aged composite cores and luting agent.

The aim of this study was to evaluate effect of different surface treatment methods on the bond strength between aged composite-resin core and luting agent

Inhibition of cathepsin-K and matrix metalloproteinase by photodynamic therapy

Objectives: The objective of this study was to determine the effects of antimicrobial photodynamic therapy (aPDT) with indocyanine green (ICG) and toluidine blue (TB) on protease activity (matrix-bound cathepsin K and matrix metalloproteinase (MMP) and dentin bond strength. Methods: Caries-free human third molars were assigned to five groups: 1—control group, 2—application of ICG with activation using an 810 nm diode (aPDT), 3—application of ICG, 4—application of TB with activation using a 660 nm diode (aPDT), and 5—application of TB. For the enzymatic investigation, dentin beams were incubated for either 3 days or 3 weeks. Aliquots of the incubation media were analyzed by ELISA for CTX (C-terminal cross-linked telopeptide of type I Collagen) and ICTP (cross-linked carboxy-terminal telopeptide of type I collagen). For microtensile bond strength testing (μTBS), composite resins were layered onto the tooth surface; the samples were then subjected to μTBS. Kruskall–Wallis and Mann–Whitney U tests were applied for statistical analysis of CTX and ICTP, one way-ANOVA and Tukey's test were applied for statistical analysis of μTBS. Results: Pretreating the dentin matrices with aPDT decreased the endogenous protease activity. ICG with laser activation resulted in the highest μTBS. Therefore, aPDT should be considered as a treatment method because it can reduce MMP-mediated dentin degradation and increase the μTBS. Significance: Inhibiting endogenous protease activity improves the stability of the dentin–adhesive bond and the durability of the bond strength