Wear resistance of injection-molded thermoplastic denture base resins

Figures & data

Table 1. Denture base resins used in this study.

Constituent	Material	Manufacturer	Processing method	Lot number
Polyamide (PA12)	Valplast	Unival Co. Ltd., Tokyo, Japan	Injection molding technique; heat processed at 215 °C for 20 min	091142
Polyamide (PACM12)	LucitoneFRS	DENTSPLY International Inc., PA, USA	Injection molding technique; heat processed at 300 °C for 17 min	100323A
Polyester (polyethylene terephthalate copolymer) (PET)	EstheShot	i-Cast Co. Ltd., Kyoto, Japan	Injection molding technique; heat processed at 230 °C for 20 min	IKB
Polyester (polycycloalkylene terephthalate copolymer) (PCTA)	EstheShot Bright	i-Cast Co. Ltd., Kyoto, Japan	Injection molding technique; heat processed at 280 °C for 20 min	2A6277240
Polycarbonate (PC)	ReigningN	Toushinyoukou Co. Ltd., Niigata, Japan	Injection molding technique; heat processed at 320 °C for 30 min	FMY31T
Polymethylmethacrylate (injection-PMMA)	Acrytone	High Dental Japan Co. Ltd., Osaka, Japan	Injection molding technique; heat processed at 260 °C for 25 min	1010087
Polymethylmethacrylate (conventional-PMMA)	Acron	GC Corp., Tokyo, Japan	Heat-polymerized, compression molding technique; heat-processed at 70 °C for 90 min, then at 100 °C for 30 min, and bench cooled for 30 min	(P)1004123(L)1003191

Figure 1. Wearing area of 10 × 10 μm² of resin and wearing force.

Table 2. Mean and standard deviation (SD) of elastic modulus (GPa), hardness (GPa), wear depth (nm), and roughness Ra (nm).

Denture base material	Elastic modulus (GPa)	Hardness (GPa)	Wear depth (nm)	Roughness Ra (nm)
				Polished surface	After testing
Valplast	1.39 (0.02)	0.152 (0.006)	159.167 (16.866)a	17.08 (4.04)b	36.38 (3.34)
LucitoneFRS	2.45 (0.02)a	0.193 (0.002)	118.792 (18.446)	9.45 (1.24)c,d	33.37 (3.76)
EstheShot	3.14 (0.03)	0.184 (0.004)	167.041 (14.212)a	16.93 (1.11)a,b	61.78 (6.14)
EstheShotBright	2.46 (0.02)a	0.179 (0.003)	153.389 (20.245)a	12.43 (1.87)c	48.17 (6.72)
ReigningN	3.46 (0.05)	0.231 (0.004)	46.060 (13.024)b	8.21 (1.09)c,d	20.07 (3.21)a
Acrytone	2.98 (0.16)	0.210 (0.008)	152.408 (16.393)a	11.84 (0.78)c,d	28.65 (2.74)
Acron	5.41 (0.06)	0.368 (0.008)	51.835 (21.101)b	8.28 (0.55)d	11.78 (3.21)c,d

The same letter denotes groups that were not significantly different from each other in group of elastic modulus, hardness, wear depth, and roughness Ra (p > 0.05).

Figure 2. Wear image of Valplast, LucitoneFRS, EstheShot, and EstheShotBright.

Figure 3. Wear image of ReigningN.

Figure 4. Wear image of Acrytone and Acron.