Interfacial fracture toughness of different surface treatments on zirconia-reinforced lithium silicate glass-ceramics.

This study investigated the influence of different surface treatments on unfiring or firing zirconia-reinforced lithium silicate (ZLS) glass-ceramics. Celtra Duo and IPS e.max CAD blocks were cut and process following manufacturer protocols.

INVESTIGATION OF MICROSCOPIC STRUCTURE, TRANSLUCENCY PARAMETERS, AND FRACTURE TOUGHNESS OF TWO PRESSABLE LITHIUM DISILICATE GLASS-CERAMIC MATERIALS.

Purpose: To investigate the microscopic structure and fracture toughness of two pressable glass-ceramics-GC Initial LiSi Press (LiSi) and IPS e.max Press (e.max)-with different levels of translucency.

Cyclic contact fatigue behavior of baria-silicate glass-ceramics as a function of crystal aspect ratio.

Ceramic materials are potentially useful for dental applications because of their esthetic potential and biocompatibility. However, evidence of contact fatigue damage in ceramics raises considerable concern regarding its effect on the survival probability predicted for dental prostheses. To simulate intraoral conditions, Hertzian indentation loading with steel indenters was applied in this study to characterize the fatigue failure mechanisms of ceramic materials.

Heat-cured poly(methyl methacrylate) resin incorporated with different food preservatives as an anti-microbial denture base material.

Background/purpose: The colonization of microorganisms onto denture bases is one common problem that can contribute to oral diseases. Herein, three food preservatives, including zinc oxide, potassium sorbate, and sodium metabisulfite were introduced as anti-microbial additives into a heat-polymerized poly(methyl methacrylate) (PMMA).

Materials And Methods: Relative microbial reductions of the modified PMMA resins against , , and were evaluated.

Ageing assessment of zirconia implant prostheses by three different quantitative assessment techniques.

Purpose: To evaluate the influence of cyclic loading on phase transformation of zirconia abutments and to compare the effectiveness of three different quantitative ageing assessment techniques.

Materials And Methods: Thirty two Y-TZP prostheses fabricated from two brands, InCoris ZI and Ceramill ZI, were cemented to titanium bases and equally divided into two subgroups (n=8): control group without any treatment and aged group with cyclic loading between 20 N and 98 N for 100,000 cycles at 4 Hz in distilled water at 37℃. The tetragonal-to-monoclinic phase transformation was assessed by (i) conventional x-ray diffraction (XRD), (ii) micro x-ray diffraction (µXRD), and (iii) micro-Raman spectroscopy.

Fracture toughness of experimental mica-based glass-ceramics and four commercial glass-ceramics restorative dental materials.

The mica-based glass-ceramics were prepared in the SiO-AlO-MgO-MgF-SrCO-CaCO-CaF-PO glass system. There were four mica-based glass-ceramics produced in this study according to the pigment added (CeO or Pr-ZrSiO/Fe-ZrSiO) and crystallization time (5-35 min). Four dental glass-ceramics, which were leucite-based, lithium disilicate-based and two zirconia reinforced lithium silicate ceramics, were also tested.

Microtensile bond strength of repaired indirect resin composite.

Purpose: The objective of this study was to investigate the effect of surface treatments on microtensile bond strengths (MTBSs) of two types of indirect resin composites bonded to a conventional direct resin composite.

Materials And Methods: Indirect resin composite blocks of Ceramage and SR Nexco were prepared in a plastic mold having a dimension of 10 × 10 × 4 mm. These composite blocks were divided into three groups according to their surface treatments: Group1: Sandblast (SB); Group2: Sandblast and ultrasonically clean (SB+UL); Group3: Sandblast plus silane (SB+SI).

Contrast ratio of six zirconia-based dental ceramics.

Purpose: The objective of this study was to determine the effect of thickness and brands on the contrast ratio of six zirconia dental ceramics.

Materials And Methods: Six brands of yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP) ceramics (ZENO® Translucent, Lava™ Plus High Translucency, inCoris TZI, Cercon® Base, Zeno®Zr, Lava™) were used in this study. Disc-shaped specimens with 15 mm diameter were prepared in five thickness levels (0.

Effect of the shades of background substructures on the overall color of zirconia-based all-ceramic crowns.

Purpose: The objective of this study was to determine the effect of the color of a background substructure on the overall color of a zirconia-based all-ceramic crown.

Materials And Methods: Twenty one posterior zirconia crowns were made for twenty subjects. Seven premolar crowns and six molar crowns were cemented onto abutments with metal post and core in the first and second group.

Comparison of two fracture toughness testing methods using a glass-infiltrated and a zirconia dental ceramic.

Purpose: The objective of this study was to compare the fracture toughness (KIc) obtained from the single edge V-notched beam (SEVNB) and the fractographic analysis (FTA) of a glass-infiltrated and a zirconia ceramic.

Materials And Methods: For each material, ten bar-shaped specimens were prepared for the SEVNB method (3 mm × 4 mm × 25 mm) and the FTA method (2 mm × 4 mm × 25 mm). The starter V-notch was prepared as the fracture initiating flaw for the SEVNB method.

Clinical performance and wear characteristics of veneered lithia-disilicate-based ceramic crowns.

Objectives: The objectives of this study were to characterize the clinical performance and wear characteristics of lithia-disilicate-based ceramic crowns.

Methods: Thirty posterior crowns were made using the heat-pressing technique and lithia-disilicate-based core ceramic. Subjects were recalled annually.