Effects of the ratio of silane to 10-methacryloyloxydecyl dihydrogenphosphate (MDP) in primer on bonding performance of silica-based and zirconia ceramics

Minkhant Koko; Tomohiro Takagaki; Ahmed Abdou; Masanao Inokoshi; Masaomi Ikeda; Takahiro Wada; Motohiro Uo; Toru Nikaido; Junji Tagami

doi:10.1016/j.jmbbm.2020.104026

Effects of the ratio of silane to 10-methacryloyloxydecyl dihydrogenphosphate (MDP) in primer on bonding performance of silica-based and zirconia ceramics

J Mech Behav Biomed Mater. 2020 Dec:112:104026. doi: 10.1016/j.jmbbm.2020.104026. Epub 2020 Aug 8.

Authors

Minkhant Koko¹, Tomohiro Takagaki², Ahmed Abdou³, Masanao Inokoshi⁴, Masaomi Ikeda⁵, Takahiro Wada⁶, Motohiro Uo⁶, Toru Nikaido⁷, Junji Tagami⁸

Affiliations

¹ Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan; Department of Conservative Dentistry, University of Dental Medicine Mandalay, Chanmyathazi, Mandalay, 05041, Myanmar. Electronic address: min.khnat.86@gmail.com.
² Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan; Department of Operative Dentistry, Division of Oral Functional Science and Rehabilitation, School of Dentistry, Asahi University, 1851 Hozumi, Mizuho, Gifu, 501-0296, Japan. Electronic address: takagaki@dent.asahi-u.ac.jp.
³ Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan; Biomaterials Department, Faculty of Dentistry, Modern University for Technology and Information, Mokatam, Cairo, 11571, Egypt.
⁴ Department of Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University 1-5-45, Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan.
⁵ Department of Oral Prosthetic Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan.
⁶ Department of Advanced Biomaterials, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan.
⁷ Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan; Department of Operative Dentistry, Division of Oral Functional Science and Rehabilitation, School of Dentistry, Asahi University, 1851 Hozumi, Mizuho, Gifu, 501-0296, Japan.
⁸ Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan.

PMID: 32841834
DOI: 10.1016/j.jmbbm.2020.104026

Abstract

Objectives: The purpose of the study was to evaluate the effects of the ratio of different concentrations of silane to 1 wt% 10-methacryloyloxydecyl dihydrogenphosphate (MDP) in primer on the performance and durability of bonding to silica-based and zirconia ceramics.

Methods: Phosphoric acid-treated lithium-disilicate (LD) and alumina-blasted zirconia specimens were assigned to five groups according to surface chemical treatment with different concentrations of γ-methacryloxypropyltrimethoxysilane (γ-MPTS) to 1 wt% MDP containing primer as follows: S0) without γ-MPTS; S1) 1 wt% γ-MPTS; S2) 2 wt% γ-MPTS; S5) 5 wt% γ-MPTS and S10) 10 wt% γ-MPTS. After priming, stainless-steel rods were bonded to the specimens with PanaviaV5 cement. Tensile bond strength (TBS) test was evaluated after 24-h (TC0) or 5000 thermocycling (TC5K). The wettability of primer-treated surfaces was measured using contact angle measurements. Surface elemental composition of zirconia was determined with X-ray photoelectron spectroscopy (XPS). The TBS data were analyzed using Weibull analysis. Contact angle data were analyzed by three-way analysis of variance (α = 0.05).

Results: Before thermocycling, S5 (34.3 ± 4.5 MPa) showed the highest TBS compared to S1 (27.8 ± 5.2 MPa) and S2 (29.7 ± 4.8 MPa), and insignificant difference with S10 (30.6 ± 6.2 MPa) in LD. For zirconia there was no significant difference in all silane containing primers with S0 (p > 0.05). Thermocycling decreased TBS for all experimental groups among both ceramics (p < 0.05). Contact angles increased in S5 and S10 for both LD and zirconia ceramics. XPS analysis revealed that phosphorous peak of MDP was detected after priming. Additionally, silica peak of γ-MPTS coexist with MDP in S5 on zirconia surface.

Significance: The bond strength of lithium-disilicate ceramics was improved with 5% γ-MPTS in MDP primer. Moreover, increasing percentage of γ-MPTS by more than 5% has not improved the bond strength, conversely, it can alter the long-term durability of the bonded ceramic. MDP primers alone are best suited for efficient bonding of resin cement with zirconia ceramic.

Keywords: Lithium–disilicate; MDP; Silane; Tensile bond strength; X-ray photoelectron spectroscopy; Zirconia.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Ceramics
Dental Bonding*
Materials Testing
Resin Cements
Shear Strength
Silanes*
Silicon Dioxide
Surface Properties
Zirconium

Substances

Resin Cements
Silanes
Silicon Dioxide
Zirconium
zirconium oxide