Table 2.
Number of Composite Restorations Placed and Change in Urinary BPA Concentrations between Baseline and Each Follow-up Visit
| No. Surfaces Restored Cumulatively | Baseline Urinary BPA (ng/mL) | Change in Urinary BPA (ng/mL) | Percent Change in Group Mean | |||||
|---|---|---|---|---|---|---|---|---|
|
| ||||||||
| Change from Baseline to: | N | Median (Min, Max) | Mean (sd) | Median | Mean (sd) | Median | Mean (sd) | |
|
| ||||||||
| Next day post-treatment visit 1* | 89 | 1 (1, 8) | 1.4 (1.0) | 1.97 | 3.33 (3.84) | 0.28 | 1.71 (9.94) | 51.4% |
| 14 days post-treatment visit 1 | 81 | 1 (1, 8) | 1.4 (1.0) | 2.13 | 3.45 (3.97) | −0.15 | −0.50 (4.09) | −14.5% |
| Next day post-treatment visit 2 | 26 | 3 (2, 6) | 3.1 (1.3) | 2.10 | 3.45 (3.35) | −0.50 | −0.59 (3.62) | −17.1% |
| 14-day post-treatment visit 2 | 15 | 3 (2, 6) | 2.9 (1.2) | 1.79 | 3.21 (2.36) | −0.34 | −0.28 (3.55) | −0.4% |
| Next day post-treatment visit 3† | 3 | 5 (3, 8) | 5.3 (2.5) | 1.10 | 1.03 (0.53) | 0.71 | 1.97 (2.91) | 191.3% |
| 14-day post-treatment visit 3 | 5 | 5 (3, 8) | 5.0 (1.9) | 1.53 | 1.91 (1.38) | −0.02 | −0.27 (1.28) | −14.1% |
| Final visit (approximately 6 mo) | 77 | 2 (1, 8) | 2.3 (1.6) | 2.12 | 3.07 (3.01) | −0.17 | 0.29 (4.66) | 9.4% |
*
Results in table included all participants. Excluding the participant with 8 surfaces restored at visit 1 and with high next-day BPA concentration of 81.8 ng/mL, results were: median baseline 1.90 ng/mL; mean baseline 3.30 (sd 3.86) ng/mL; median change 0.25 ng/mL, mean change 0.87 (sd 5.98) ng/mL, percent change in group mean 26.4%.
†
Of the 3 participants with a visit 3, the number of surfaces filled at visits 1, 2 and 3, respectively, were as follows: 1, 1, 1 (total 3 surfaces); 2, 2, 1 (total 5 surfaces); and 3, 3, 2 (total 8 surfaces).