Papers by Jukka P Matinlinna
Dentistry journal, Aug 1, 2019
Poster Session - Current Dental Ceramics: Mechanical Properties, Adaptation & Adhesion: no. 0406
Mechanics of Composite Materials, 2017
International Journal of Adhesion and Adhesives, 2015
ABSTRACT
ABSTRACT Objective: The objective of this study was to compare two bonding models and two surface... more ABSTRACT Objective: The objective of this study was to compare two bonding models and two surface treatments on the lithium disilicate ceramics with two resin cements using a microtensile bond test (µTBS). Method: Ceramic blocks (e.max CAD®, Ivoclar) were sectioned, polished and fired for final crystallization. They were treated with two surface treatments: (1) hydrofluoric acid (HF) (IPS Ceramic Etching gel) etched followed by silane (Monobond-S, Ivoclar) application; (2) HF etched, silane applied, followed by hot air drying, rinsing with hot water, dried and unfilled resin (Heliobond, Ivoclar) applied. Ceramic blocks without surface treatment were control groups. Two bonding substrates were used: resin composite (Estenia, Kuraray-Noritake) and ceramic. The bonded substrates were divided into two bonding models: ceramic to ceramic (C-C) and ceramic to resin composite (C-R). Two resin cements, Variolink II® (Ivoclar) and Clearfil SA Cement (Kuraray-Noritake), were tested. Each group was sectioned into beams (n=30) and stored in distilled water for 7 days at 37°C. Specimens were subjected to µTBS. Failure modes were determined with light microscopy and SEM. ANOVA and Bonferroni tests were used for statistical analysis (p<0.05). Result: All control groups spontaneously debonded during cutting. The C-C groups showed significantly higher µTBS than C-R groups (p<0.05). Failure mode in C-R groups was dominated by cohesive failure in resin cement while in C-C groups was mostly mixed failure. Ceramic treated with HF etching and silanization and cemented with Variolink II showed the highest µTBS (53.5±6.6MPa) while ceramic treated with HF etching, silanization, hot air and water treatment and cemented with Clearfil SA Cement showed the lowest µTBS (35.4±7.0MPa) in the C-C groups. Conclusion: C-C model is recommended for evaluating the µTBS of ceramic-resin cement adhesion. Variolink II showed better bonding than Clearfil SA Cement.
ABSTRACT Objective: To contrast and compare the effects of three surface coatings on the bond str... more ABSTRACT Objective: To contrast and compare the effects of three surface coatings on the bond strength between zirconia and resin-cement. Method: 32 pre-sintered zirconia discs (25 mm diameter, 1.5 mm thickness) were sectioned from zirconia blocks and polished under running water. All the samples were randomly divided into four experimental groups and treated as follows: control group (fully sintered, no treatment), group S (fully sintered and sandblasted with silica-coated alumina powders), group G (fully sintered + glazing porcelain veneering + HF etching), group Si (coated with silica and fully sintered). After being ultrasonically cleansed in 70% ethanol solution, a silane coupling agent was applied on each zirconia sample and allowed to react for 5 minutes. Subsequently, the self-adhesive resin composite was bonded on zirconia discs with the cylindrical stub shape (3.6 mm diameter, 3 mm thickness). Each group comprised forty resin stubs. The four groups were kept in a desiccator for 24 h. Half of the specimens in each group was tested with initial shear bond strength and the other half was tested after being stored in 37ºC water for one month. Result: The lowest initial shear bond strength (8.8 MPa) was obtained in control group and the highest value (19.7 MPa) was produced in group S. However, the difference between group S and group Si was not significant. After the water storage, some of the resin stubs in the control group were spontaneously detached from zirconia surface. This group had the lowest bond strength value (1.2 MPa). The differences among groups S (15.1 MPa), G (14.9 MPa) and Si (15.3 MPa) were not significant. Conclusion: Surface treatment is necessary for establishing the successful and durable zirconia/resin integration. Silicon-based coatings are an effective way in enhancing resin zirconia bonding.
Objective: To characterize silica-coated zirconia surfaces by silicon nitride (Si3N4) hydrolysis ... more Objective: To characterize silica-coated zirconia surfaces by silicon nitride (Si3N4) hydrolysis under alkaline condition + a thermal treatment, scanning electron microscopy(SEM), energy-dispersive X-ray spectroscopy(EDX) and atomic force spectroscopy(AFM). The new silica-coating method has the potential to significantly promote resin-zirconia bonding. Method: Polished zirconia was cut into specimens 10mmx5mmx5mm (Upcera, China) were immersed in 2M KOH solution and heated up to 90°C. Then, 0.6 wt% of Si3N4powder dispersion was prepared by adding it into the solution. Pretreated zirconia samples were immersed into the dispersion for 6, 24, and 48 h. Next, zirconia samples were air-dried and thermally treated at 1400°C for 2 h. As control, zirconia was silica-coated using Rocatec™ Sand Plus (110 µm silica-coated alumina). The surface morphology and surface roughness were examined by using SEM and AFM. The elemental composition of the zirconia surfaces were examined by using EDX. Surfa...
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Papers by Jukka P Matinlinna