Objective: The purpose of this study was to evaluate the physical properties of a new experimental material (EXP, Ivoclar Vivadent) in comparison to five commercial temporary C&B materials including Fill-In Unidose (FILL, Kerr), Luxatemp AutomixPlus (LUX, DMG), Protemp 3Garant (PRO, 3M/ESPE), PERFECtemp II (PT2, Discus) and Structur 2SC (2SC, VOCO). Methods: Sample preparation and measurement of flexural strength (FS) were performed in accordance with ISO 4049 (N=8). Moduli (FM) resulted from the same experiments. Ball indentation hardness (BIH) was measured according to ISO 2039 (N=5). Volumetric polymerization shrinkage (VS) was determined via density measurements of material before mixing and after setting and subsequent storage for 24 h at 37 °C in distilled water (N=6). Temperature increase during polymerization (TI) was recorded on a thermocouple apparatus described in ISO 4049 (7.8, filling and restorative materials) starting at 37 °C (N=3). Results: The results are summarized in the table below. Conclusions: ANOVA analysis revealed that flexural strength of EXP was comparable to LUX and higher than all other tested materials. The lowest temperature increase during setting reaction was observed for EXP. Polymerization of EXP resulted in smallest but second volume shrinkage among all tested materials.

	EXP	FILL	LUX	PRO	PT2	2SC
FS / MPa	96±15a*	82±9b	87±3a,b	83±5b	70±2c	61±4c
FM / GPa	3.0±0.3a	3.0±0.2a	2.9±0.1a	2.3±0.1b	2.0±0.1b	1.7±0.2c
BIH / MPa	113±2b	183±23a	98±3b,c	115±4b	88±4c,d	70±12d
VS (24 h) / %	4.0±0.1b	3.2±0.2a	4.9±0.1c	4.7±0.2c	5.5±0.1d	5.0±0.3c
TI / K	2.73±0.15**	7.19±0.15	3.17±0.15	3.00±0.15	3.00±0.15	3.13±0.15

* Means with the same letters are not significantly different (p<0.05) within the same row (ANOVA and post hoc Tukey).

** No statistical analysis was performed for measurements with N=3. Stated errors resulted from error propagation calculations.