Table 1.

Materials used for specimen fabrication and procedure details.

	Materials
	Heat-Polymerized Resin	NextDent	FormLabs
Manufacturer	Major.base.20, Major Prodotti Dentari SPA, Moncalieri, Italy	Denture 3D+, NextDent B.V., Soesterberg, The Netherlands	FormLabs Denture Base LP, FormLabs, Somerville, MA, USA
Composition	Powder: Polymer (PMMA) þ initiator (benzoyl peroxide) (0.5%) þ pigments (salts of cadmium or iron or organic dyes) Liquid: Monomer (MMA) þ cross-linking agent (ethylene glycol dimethacrylate 10%) þ inhibitor (hydroquinone)	Ethoxylated bisphenol A dimethacrylate 7,7,9 (or 7,9,9)-trimethyl-4,13-dioxo-3,14-dioxa-5,12- diazahexadecane-1,16-diyl bismethacrylate 2- hydroxyethyl methacrylate silicon dioxide diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide titanium dioxide	55–75% w/w urethane dimethacrylate, 15–25% w/w methacrylate monomers, and <0.9% w/w phenyl bis(2,4,6-trimethylbenzoyl)-phosphine oxide
Polymerization method	Heat polymerization	3D printing with digital light processing	3D printing with stereolithography
Fabrication procedure	Wax specimens are invested within a metal flask. Wax elimination results in molds packed with dough acrylic resin. For polymerization, flasks are placed into a thermal curing unit (90 min at 74 °C and then 30 min at 100 °C).	(Photo polymerized) printed layer by layer (50 µm layer thickness) 0-degree printing orientations Post-curing machine (LC-D Print Box [3D systems]) and conditions (30 min/60 °C)	(Photo polymerized) printed layer by layer (50 µm layer thickness) 0-degree printing orientations Post-curing machine (FormCure) and conditions (30 min/60 °C)
Polishing technique	Specimens are cleaned and polished using an automated polishing machine (Metaserv 250 grinder-polisher; Buehler GmbH) with a mounted silicon carbide paper with different grits (800, 1500, and 2000).