Table 1 List of materials used and their characteristics.

From: Advantages and feasibility of prefabricated PEEK crowns for aesthetic restoration in primary teeth

Brand name

Manufacturer

Composition

PEEK material and PEEK Crowns

Xi’an Noble & Novel Dental Technology Co., Ltd, Xi’an, China

Polyetheretherketone

Fuji IX glass ionomer cement

GC, Tokyo, Japan

Powder: 95% alumino-fluoro-silicate glass and 5% polyacrylic acid powder (by weight).

Liquid: 50% distilled water, 40% polyacrylic acid, and 10% polybasic carboxylic acid.

Powder/liquid ratio: 3.6/1.0

Dentex dual cure resin cement

Sino-Dentex Co. Ltd, Jilin, China

Dimethacrylate, β-hydroxyethyl methacrylate, bis(2-acryloyloxypropanediol)phosphate; photoinitiator, stabilizer and acetone

RelyX Ultimate Clicker

3 M ESPE, St. Paul, MN, USA

Radiopaque fluoroaluminosilicate glass, opacifying agent, HEMA, water, reducing agent and dispersion aid

Preformed Metal Crowns

3 M ESPE, St. Paul, MN, USA

Stainless steel

Preformed Zirconia Crowns

NuSmile, Huston, TX, USA

Zirconia

Artificial saliva

Shaanxi Yinuo Biology Technology Co., Ltd, China

Distilled water, NaCl, KCl, Na2SO4, NH4Cl, CaCl2·2H2O, NaH2PO4·2H2O, CN2H4O and NaF

Sulfuric acid

Sigma-Aldrich (Shanghai) Trading Co.Ltd.

Product Number : 258,105

sulphuric acid