Optical properties of manually and CAD/CAM-fabricated polymers

Güth, Jan‐Frederik; Zuch, Timo; Zwinge, Sebastian; Engels, Jörg; Stimmelmayr, Michael; Edelhoff, Daniel

doi:10.4012/dmj.2013-099

Cited by 52 publications

(56 citation statements)

References 19 publications

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“…Glass-ceramic materials and some polymers show higher transmittance than Zirconia 19,20,27,28) . A prior study investigated the translucency of zirconia copings produced on eight different CAD/CAM systems (LAVA Frame 0.3 and 0.5; 3M ESPE, IPS e.max ZirCAD; Ivoclar Vivadent AG, VITA YZ; VITA Zahnfabrik, Procera All Zircon; Nobel Biocare AB, Digizon; Amman Girrbach AG, DC Zircon; DCS Dental AG, Cercon Base; DeguDent GmbH).…”

Section: Discussionmentioning

confidence: 99%

Light transmittance by a multi-coloured zirconia material

Ueda

Güth

Erdelt

et al. 2015

Dental Materials Journal

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Full-contour zirconia restorations are gaining in popularity. Highly translucent zirconia materials and multi-coloured zirconia blocks might help to overcome the aesthetic drawbacks of traditional zirconia. This study evaluated the transmittance of visible light (400-700 nm) through the four different layers (Enamel Layer EL, Transition Layer 1 TL1, Transition Layer 2 TL2, Body Layer BL) of a multi-coloured zirconia block (KATANA™ Zirconia Multi-Layered Disc (ML)) using a spectrophotometer. Forty specimens (thickness of 1±0.05 mm) from each layer were examined and statistically evaluated at a confidence-level of 5%. Light transmittance was expressed as a percentage of the through-passing light. The following mean values (SD) were found: EL 32.8% (1.5), TL1 31.2% (1.3), TL2 25.4% (1.3) and BL 21.7% (1.1). Significant differences were found between all groups (ANOVA, Student-Newman-Keuls). This multi-coloured zirconia block showed four layers with different light transmittance capabilities. It might therefore be useful for enhancing the aesthetic appearance of full-contour zirconia restorations made from this material.

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Section: Discussionmentioning

confidence: 99%

Light transmittance by a multi-coloured zirconia material

Ueda

Güth

Erdelt

et al. 2015

Dental Materials Journal

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“…Compared to conventionally-polymerized temporary materials, high-density polymers offer a wider range of translucency [4] and a higher stability against discoloration [5]. However, PMMA-based polymer materials indicated for temporary restorations present higher wear than resin-based polymeric composites indicated for permanent CAD/CAM restorations [6].…”

Section: Introductionmentioning

confidence: 99%

Repairability of CAD/CAM high-density PMMA- and composite-based polymers

et al. 2015

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OBJECTIVE The study aimed to analyse the shear bond strength of computer-aided design and computer-aided manufacturing (CAD/CAM) polymethyl methacrylate (PMMA)-and compositebased polymer materials repaired with a conventional methacrylate-based composite after different surface pretreatments. METHODS Each 48 specimens was prepared from six different CAD/CAM polymer materials (Ambarino high-class, artBloc Temp, CAD-Temp, Lava Ultimate, Telio CAD, Everest C-Temp) and a conventional dimethacrylate-based composite (Filtek Supreme XTE, control) and aged by thermal cycling (5000 cycles, 5-55°C). The surfaces were left untreated or were pretreated by mechanical roughening, aluminium oxide air abrasion or silica coating/silanization (each subgroup n = 12). The surfaces were further conditioned with an etchrinse adhesive (OptiBond FL) before the repair composite (Filtek Supreme XTE) was adhered to the surface. After further thermal cycling, shear bond strength was tested, and failure modes were assessed. Shear bond strength was statistically analysed by twoand one-way ANOVAs and Weibull statistics, failure mode by chi(2) test (p 0.05). RESULTS Shear bond strength was highest for silica coating/silanization > aluminium oxide air abrasion = mechanical roughening > no surface pretreatment. Independently of the repair pretreatment, highest bond strength values were observed in the control group and for the composite-based Everest C-Temp and Ambarino high-class, while PMMA-based materials (artBloc Temp, CAD-Temp and Telio CAD) presented significantly lowest values. For all materials, repair without any surface pretreatment resulted in adhesive failures only, which mostly were reduced when surface pretreatment was performed. CONCLUSIONS Repair of CAD/CAM high-density polymers requires surface pretreatment prior to adhesive and composite application. However, four out of six of the tested CAD/CAM materials did not achieve the repair bond strength of a conventional dimethacrylate-based composite. CLINICAL RELEVANCE Repair of PMMA-and composite-based polymers can be achieved by surface pretreatment followed by application of an adhesive and a conventional methacrylate-based composite. Conclusions: Repair of CAD/CAM high-density polymers requires surface pretreatment prior to adhesive and composite application. However, four out of six of the tested CAD/CAM materials did not achieve the repair bond strength of a conventional dimethacrylate-based composite.Clinical Relevance: Repair of PMMA-and composite-based polymers can be achieved by surface pretreatment followed by application of an adhesive and a conventional methacrylate-based composite.2

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“…The optical properties (translucency, fluorescence, opalescence, etc.) of glass-ceramics/ceramics are superior to those of resin-based materials (Lim et al, 2010;Güth et al, 2013). While glass-ceramics/ceramics (depending on their composition) might be adversely affected by the pH of the oral environment and/or of the diet, water sorption/desorption could lead to the degradation of the polymer matrix and/ or of the coupling-agent-mediated polymer-filler bond (Nambu et al, 1991).…”

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confidence: 99%

Resin-composite Blocks for Dental CAD/CAM Applications

2014

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Advances in digital impression technology and manufacturing processes have led to a dramatic paradigm shift in dentistry and to the widespread use of computer-aided design/computer-aided manufacturing (CAD/CAM) in the fabrication of indirect dental restorations. Research and development in materials suitable for CAD/CAM applications are currently the most active field in dental materials. Two classes of materials are used in the production of CAD/CAM restorations: glassceramics/ceramics and resin composites. While glass-ceramics/ceramics have overall superior mechanical and esthetic properties, resin-composite materials may offer significant advantages related to their machinability and intra-oral reparability. This review summarizes recent developments in resin-composite materials for CAD/CAM applications, focusing on both commercial and experimental materials.

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Optical properties of manually and CAD/CAM-fabricated polymers

Cited by 52 publications

References 19 publications

Light transmittance by a multi-coloured zirconia material

Light transmittance by a multi-coloured zirconia material

Repairability of CAD/CAM high-density PMMA- and composite-based polymers

Resin-composite Blocks for Dental CAD/CAM Applications

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