Endocrowns were manufactured using different restorative materials to evaluate the marginal adaptation and fracture strength. Fifty endodontically treated mandibular first molar teeth were divided into five groups (n = 10). Endocrowns were obtained from lithium disilicate glass ceramic ingots by heat‐press technique (Group e.max Press: GEP), and from feldspathic blocks (Group Cerec: GC), polymer infiltrated ceramic network blocks (Group Enamic: GE), lithium disilicate glass ceramic blocks (Group e.max CAD: GEC), and zirconia‐reinforced glass ceramic blocks (Group Suprinity: GS) by CAD/CAM technique. After thermocycling, marginal adaptation was evaluated under scanning electron microscope at ×200 magnification. The specimens' fracture strengths were tested in universal test machine, and fracture types were evaluated. Statistical analyses were performed with Kruskal–Wallis test. The highest marginal gap value was found in GEP, but no significant differences were determined among the other four groups (p > .05). Significant differences were observed among the groups in terms of fracture strength (p = .019). The fracture strength values of GEC were significantly higher than GE, GC, and GS (p < .05). Values were not significantly different between the GEC and GEP groups (p > .05). CAD/CAM endocrowns showed better marginal adaptation than heat‐pressed endocrowns. Clinically acceptable marginal gaps were seen in both endocrown types. Both CAD/CAM and heat‐pressed lithium disilicate glass ceramic endocrowns showed higher fracture strength.
Aim The aim of the study was to evaluate the effect of different two mouthrinses and repolishing on the color stability of hybrid nanoceramic computer-aided design/computer-aided manufacturing (CAD/CAM) material. Materials and Methods Thirty specimens with dimensions of 1.5 × 12 × 12 mm3 were prepared from Cerasmart CAD/CAM blocks and divided into three groups according to the immersion solutions; distilled water, Oral B, and 0.12% chlorhexidine gluconate (CHX) for 2 min, twice for a day. Initial, 7th day, 14th day, and following repolishing color values were measured with a dental spectrophotometer according to the CIELab system and color changes were calculated (ΔE). Data were statistically analyzed with the Kruskal–Wallis test. Results Oral B and CHX groups showed significantly higher ΔE values than control groups (P ≤ 0.05). No significant differences were found between Oral B and CHX in both ΔE measurements (P ≥ 0.05). There were no significant differences among the 7th day, 14th day, and after repolishing color changes in control and CHX groups (P ≥ 0.05). However, color change after repolishing was significantly less than the 14th day color change (P ≤ 0.05). Conclusions Oral B and CHX caused discoloration on the CAD/CAM restorative material in clinically acceptable limits. Repolishing could provide a significant change only after 14 days of use Oral B.
ÖZAmaç: Koronavirus Hastalığı 2019 (COVID-19), Dünya Sağlık Örgütü (DSÖ) tarafından, tüm dünyadaki insanları etkileyen küresel bir halk sağlığı acil durumu olarak ilan edildi. Bu çalışmanın amacı, COVID-19 salgını sırasında diş hekimine başvuran hastaların COVID-19 hakkında bilgi ve endişelerini değerlendirmektir. Gereç ve Yöntemler:Temmuz-Ekim 2020 tarihleri arasında Zonguldak Bülent Ecevit Üniversitesi Diş Hekimliği fakültesine başvuran 400 hastaya, COVID-19 salgını ile ilgili literatür ışığında hazırlanmış olan toplam 17 adet sorudan ve iki bölümden oluşan anket yapıldı. Hastalar yaşa göre 18-25, 26-40 ve 40 yaş üstü bireyler olmak üzere üç gruba, eğitim düzeyine göre ilköğretim, ortaöğretim, meslek yüksekokulu (önlisans), lisans, lisansüstü ve uyruğa göre Türkiye Cumhuriyeti vatandaşı veya Türkiye Cumhuriyeti vatandaşı olmayan olarak kategorize edildi. Elde edilen verilerin, hastaların kategorilerine göre verdiği cevaplar ile ilişkisini değerlendirmek için Pearson ki-kare testi kullanıldı. p<0.05 değeri istatistiksel olarak anlamlı kabul edildi.Bulgular: Çalışmaya %54'ü (n=216) kadın, %46'sı (n=184) erkek olmak üzere toplam 400 hasta katıldı. COVID-19'un bulaşıcı bir hastalık olduğunu düşünenlerin oranı %47, olmadığını düşünenlerin oranı ise %53 olarak elde edildi ve verilen yanıtlar ile eğitim durumu arasında istatistiksel bir fark bulundu (p=0.000). COVID-19'un bulaşıcı olduğunu düşünenlerin %78,8'i lisans mezunudur. COVID-19'un yüzeylere temas ile bulaşacağını düşünenlerin oranı %99 olarak elde edildi ve bu soruya verilen yanıtlar ile katılımcıların cinsiyeti ilişkisi değerlendirildiğinde istatistiksel olarak anlamlı fark bulundu (p=0.044). COVID-19'dan korunmada diş hekiminin ve yardımcı personelin koruyucu gözlük ve tıbbi maske giymesinin hasta ve sağlık personelinin korunması için yeterli olduğunu düşünenlerin oranı %88'dir. Bu soruya verilen yanıtlar değerlendirildiğinde katılımcıların yaşı (p=0.000) ve eğitim (p=0.000) düzeyleri açısından istatistiksel olarak anlamlı farklılıklar elde edildi.Sonuç: COVID-19'un dental uygulamalar sırasında hekim ve hastalara bulaşma riski yüksektir. Diş hekimleri ve hastaları için COVID-19'dan korunmada, hastalık hakkında farkındalığı artırmak, hastalığa sahip olabilecek kişilerle temastan kaçınmak, dental işlemler sırasında uygun kişisel koruyucu ekipman kullanmak ve kişisel hijyen davranışlarına dikkat çekmek oldukça önemlidir.
This study aimed to compare the effect of acid etching, sandblasting, or silica coating on the micro-shear bond strength of dual-cured resin cements to computer-aided design and computer-aided manufacturing (CAD/CAM) glass ceramic materials. Feldspathic, lithium disilicate, and zirconia-reinforced CAD/CAM ceramics were divided into four groups: control group (C), no surface treatment; hydrofluoric (HF) group, 5% HF acid-etched; sandblasting (SB) group, abraded with 50 µm aluminum oxide (Al2O3) particles; silica-coated (CJ) group, abraded with 30 µm silica-modified Al2O3 particles. Roughness values were obtained by using a profilometer. The cements were condensed on the surface-treated specimens and a micro-shear bond test was conducted. The ceramic material (p < 0.001) and surface treatment type (p < 0.001) significantly affected the micro-shear bond strength values. HF acid etching can be recommended for the surface pretreatment of feldspathic, lithium disilicate, and zirconia-reinforced CAD/CAM ceramics. Better bond strengths can be obtained with HF acid etching than with sandblasting and silica coating.
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