Table 3. Clinical evaluation of resin restoration with SBU for primary teeth preetched with or without 35% H3PO4 at 6, 12, and 18 months.
| Evaluation criteria | 6 months, n (%) | 12 months, n (%) | 18 months, n (%) | |||||
| SBU (N=42) | Preetch (N=42) | SBU (N=42) | Preetch (N=42) | SBU (N=42) | Preetch (N=42) | |||
|
Chi-square test was used to compare the pre-etching group and SBU group. *P<0.05, **P<0.01. SBU: Single Bond Universal. | ||||||||
| Retention | ||||||||
| Partial loss | 3 (7.14) | 1 (2.38)* | 6 (14.29) | 2 (4.76)** | 8 (19.05) | 2 (4.76)** | ||
| Completely loss | 1 (2.38) | 0 (0.00) | 3 (7.14) | 1 (2.38)* | 4 (9.52) | 2 (4.76)* | ||
| Total | 4 (9.52) | 1 (2.38)* | 9 (21.43) | 3 (7.14)** | 12 (28.57) | 4 (9.52)** | ||
| Marginal adaptation | ||||||||
| Partial crack | 2 (4.76) | 1 (2.38) | 5 (11.90) | 2 (4.76)* | 6 (14.28) | 3 (7.14)* | ||
| Obvious cracks | 0 (0.00) | 0 (0.00) | 3 (7.14) | 1 (2.38)* | 4 (9.52) | 2 (4.76)* | ||
| Total | 2 (4.76) | 1 (2.38) | 8 (19.05) | 3 (7.14)* | 10 (23.81) | 4 (9.52)* | ||
| Marginal discoloration | ||||||||
| Discoloration | 2 (4.76) | 0 (0.00) | 4 (9.52) | 1 (2.38)* | 6 (14.28) | 2 (4.76)* | ||
| Visibly discoloration | 0 (0.00) | 0 (0.00) | 2 (4.76) | 1 (2.38) | 4 (9.52) | 2 (4.76)* | ||
| Total | 2 (4.76) | 0 (0.00) | 6 (14.28) | 2 (4.76)* | 10 (14.28) | 4 (9.52)* | ||
| Secondary caries | 1 (2.38) | 0 (0.00) | 4 (9.52) | 1 (2.38)* | 6 (14.28) | 2 (4.76)* | ||