Objective: This study evaluated the flexural strength and fracture toughness of temporary crown and bridge materials. Methods: Four bis-acrylic temporary crown and bridge materials including experimental material (EXP, Kerr), Luxatemp Plus (LUX, DMG), Protemp 3 Garant (PRO, 3M/ESPE) and Integrity (INT, Dentsply) were tested. Flexural strength (FS, n=8), flexural modulus (FM, n=8), fracture toughness (K1c, n=6) and Barcol hardness (BH, n=3) of these materials were measured according to ISO 4049, ASTM E399 and ASTM D2583, respectively. All sample specimens were conditioned in de-ionized water at 37 °C for 24 hours prior to testing. Results: ANOVA analysis revealed that EXP had significantly higher flexural strength, flexural modulus and Barcol hardness than the other tested materials. The fracture toughness of EXP was not significantly different from PRO and was greater than LUX and INT.

Properties	EXP	LUX	PRO	INT
FS (MPa)	164 ± 12.8a*	84.5 ± 6.7b,c	74.8 ± 2.2b	87.3 ± 7.6c
FM (GPa)	8.5 ± 0.7a	2.6 ± 0.2b	2.0 ± 0.2c	2.7 ± 0.2b
K (MPa.m0.5)	1.53 ± 0.06a,b	1.37 ± 0.08a,c	1.58 ± 0.11b	1.26 ± 0.15c
BH	75 ± 0.6a	56 ± 0.6b	50 ± 1.2c	54 ± 0.6b

* Means with the same letters are not significantly different (p<0.05) within the same row.

Conclusions: The experimental material had the highest flexural strength, flexural modulus and Barcol hardness among all the tested materials. In addition, the experimental material and Protemp 3 Garant had the higher fracture toughness than Luxatemp Plus and Integrity.

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