RESULTS
The combination of observations and photographs indicated clinical improvement of wrinkles of the tested substance SSTT, with 46.2% and 64.3% of subjects showing marked or moderate improvement at 4 and 8 weeks, respectively (Tables 1,2). These effects were statistically significant (P < 0.001) compared with the control cosmetic showing 0% with
marked or moderate improvement at 4 and 8 weeks, respectively. The wrinkle grades of pre-application were 3.28 ± 0.18 (mean ± standard error) in the tested site and 3.33 ± 0.20 in the control site, respectively. The wrinkle grades (the decrease from baseline) in the tested site significantly improved at 4 and 8 weeks as compared with pretreatment
(P < 0.001). The control site also showed significant improvement at 4 and 8 weeks as compared with pre-application (P < 0.01). The tested site showed significant reduction as compared with the control site both at 4 and 8 weeks (P < 0.001) (Fig. 1). Representative cases with marked response are shown in Figures 2 and 3. Ra values of pre-treatment were 19.42 ± 1.04 in the tested site and 18.44 ± 0.88 in the control site. Ra value from skin replica on the tested area showed significant reduction at 8 weeks (P < 0.01) as compared with pretreatment (0 at 0 weeks and –2.19 at 8 weeks) (Fig. 4). Ra on some control areas demonstrated reduction without significant difference (0 at 0 weeks and –0.51 at 8 weeks). Reduction of Ra on the tested area at 8 weeks was more than that on the controlled area with a significant difference
(P < 0.05) (Fig. 4). Representative cases with marked response in skin replica are shown in Figures 5 and 6. Twenty-nine subjects of all the subjects completed the 8-week study with no adverse effects. Only one subject complained of a burning sensation with faint erythema on the applied site and consequently left the study.