Effect of different palatal vault shapes after 30 days of water storage, in any of the experi- mental groups (P>.05) (Table 3). In U-SHAPED groups; significant differences were found between linear measurements per- formed 24 h after polymerization and after 30 days of water storage in all groups (U/NOF, U/WOF, U/ ROF) P<.01 (Table 4). In V-SHAPED groups; significant differences were found between linear measurements per- formed 24 h after polymerization and after 30 days of water storage in all groups (V/NOF, V/WOF, V/ ROF) (P<.01) (Table 5). In ROUNDED groups; significant differences were found between linear measurements per- formed 24 h after polymerization and after 30 days of water storage in all subgroups (ROUNDED/NOF, ROUNDED/WOF, ROUNDED/ROF) (P<.01) (Table 6). Table 4. Mean, standard deviation and P values of data (mm) obtained from linear measurements of distances between 4 references points (A,B,C, and D) in Uium palatal vault rounded groups 24 h after polymerization and after 30 days of water storage (* = P<.05). Table 5. Mean, standard deviation and P values of data (mm) obtained from linear measurements of distances between 4 references points (A,B,C, and D) in V palatal vault roun- ded groups 24 h after polymerization and after 30 days of water storage (* = P<.05). Time of linear measurement 24 h (a.p.) 30 days (w.s.) 24 h (a.p.) 30 days (w.s.) 24 h (a.p.) 30 days (w.s.) 24 h (a.p.) 30 days (w.s.) Time of linear measurement 24 h (a.p.) 30 days (w.s.) 24 h (a.p.) 30 days (w.s.) 24 h (a.p.) 30 days (w.s.) 24 h (a.p.) 30 days (w.s.) Mean 46.310 46.970 44.130 44.830 46.060 46.610 43.860 44.530 Mean 50.160 50.470 50.870 51.080 48.970 49.270 48.980 49.280 U/NOF St. Dev. 0.367 0.654 0.216 0.538 0.320 0.526 0.284 0.263 V/NOF St. Dev 0.184 0.211 0.149 0.114 0.236 0.164 0.193 0.123 P <0.01* <0.01* <0.01* <0.01* <0.01* <0.01* <0.01* <0.01* P <0.01* <0.01* <0.01* <0.01* Mean 46.570 46.900 44.760 45.120 45.290 45.570 44.120 44.350 Mean 50.190 50.600 50.770 51.130 48.930 49.270 48.890 43.298 Mean 47,350 47,840 46,320 46,820 46,000 46,430 54,250 54,630 U/WOF St. Dev. 0.287 0.254 0.570 0.571 0.601 0.552 0.215 0.212 V/WOF St. Dev 0.233 0.245 0.330 0.231 0.183 0.125 0.335 0.273 0.246 0.250 0.169 0.169 0.183 0.183 0.190 0.231 P <0.01* <0.01* <0.01* <0.01* <0.01* <0.01* <0.01* <0.01* P <0.01* <0.01* <0.01* <0.01* <0.01* <0.01* <0.01* <0.01* Mean 46.380 46.910 44.270 44.810 45.140 45.600 43.930 44.350 Mean 50.110 50.460 50.680 51.060 49.060 49.330 48.940 49.360 Mean 47,570 47,470 46,610 46,890 46,100 46,430 54,270 54,660 U/ROF St. Dev. 0.297 0.191 0.221 0.443 0.165 0.302 0.206 0.360 V/ROF St. Dev 0.292 0.310 0.308 0.135 0.107 0.125 0.207 0.241 0.245 0.157 0.269 0.152 0.267 0.283 0.275 0.217 P <0.01* <0.01* <0.01* <0.01* <0.01* <0.01* <0.01* <0.01* P <0.01* <0.01* <0.01* <0.01* <0.01* <0.01* <0.01* <0.01* Groups Distances Groups Distances A-B A-C A-D B-C A-B A-C A-D B-C A-B A-C A-D B-C Groups Distances Time of linear measurement 24 h (a.p.) 30 days (w.s.) 24 h (a.p.) 30 days (w.s.) 24 h (a.p.) 30 days (w.s.) 24 h (a.p.) 30 days (w.s.) Mean 46,890 47,430 46,030 46,550 45,760 46,230 53,940 54,390 0.472 0.377 0.316 0.317 0.366 0.267 0.232 0.218 < 0.01* < 0.01* < 0.01* < 0.01* 76 (* = p<0.05) European Journal of Dentistry Table 6. Mean, standard deviation and P values of data (mm) obtained from linear measurements of distances between 4 references points (A,B,C, and D) in rounded palatal vault rounded groups 24 h after polymerization and after 30 days of water storage. ROUNDED/NOF ROUNDED/WOF ROUNDED/ROF St. Dev P St. Dev P St. Dev P