Effect of pre-heating on studied variables.

Table 1: Effect of pre-heating on studied variables.

Study	Degree of monomer conversion	Marginal adaptation	Flexural strength	Viscosity	Micro- hardness	Micro- leakage	Polymerization shrinkage
Daronch, et al. [9]	↑
Wagner, et al. [6]						↓^*
Uctasli, et al. [3]			-
Lohbaue, et al. [7]	↑						-
Saade, et al. [18]					-
El-Korashy, et al. [10]	↑						↑
Lucey, et al. [14]				↓	↑
Fróes-Salgado, et al. [13]	-	↑	-
Choudhary, et al. [2]		↑
Nada, et al. [8]					↑
dos Santos, et al. [17]						↓^*
Deb, et al. [5]			-	↓		-	↑
Karaarsla, et al. [4]						-
Ayub, et al. [15]				↓	↑
Calheiros, et al. [12]	↑
Tauböck, et al. [19]	↑
Yang, et al. [16]						↓
Theobald, et al. [11]	↑				-

↑: Increase; ↓: Decrease; -: No statistically significant difference; ^*: Under certain circumstances.