Objective: Assess short-term patterns (0.5-3y) of USPHS clinical changes within Class-V trials versus recently reported long-term patterns (3-10y) observed for Class-I's and II's (Bayne et al., Trans Acad Dent Mater 2009).
Methods: Two clusters (surface, margin) of USPHS categories (color [CL], surface texture [ST], wear [WR], marginal adaptation [MA], marginal staining [MS], caries [CR]) were rated (alfa [A=ideal], bravo [B=clinically acceptable], charlie [C=clinically unacceptable]) using the same 4-person highly-calibrated team over several recalls. Clinical trials (CT=11 spanning ~12y; Fuji-II-LC-Caps, Fuji-GC-GI, ProBond, OptiBond, OptiBond-Solo, Prime&Bond-2.1, Scotchbond, Scotchbond-Multipurpose, Single-Bond, LP2, Excite) including both Class-V bonded composites and glass ionomer systems were pooled (n=756 original restorations). Distributions (A-to-B, A-to-C, B-to-C USPHS changes) and patterns (1, 2, or 3-or-more USPHS categorical changes-per-patient-per-recall) were counted. Pattern results were compared (ANOVA; Bonferonni post-hoc tests; p≤0.05; capital superscripts within rows; small superscripts among rows).
Results: Multi-category USPHS patterns were rare (2-category [≤6.4%]; ≥3-category [≤6.6%]). 1-category changes dominated overall (10.5-33.7%). Actual USPHS changes were infrequent (0-9%) until 3y when MA and MS increased quickly. Information beyond 3y is needed to reveal associated patterns.
Pooled Data
| Distribution of USPHS Changes
(%, Mean±sd) | Patterns of changes
(%, Mean±sd) | Yr | CT | Rsts (n) | Surface Changes | Margin Changes | 1-category | 2-category | ≥3-category | CL | ST | WR | MA | MS | CR | 0.5 | 8 | 455 | 3±5 | 2±5 | 0±0 | 2±2 | 1±2 | 0±0 | 10.5±7.4%Aa | 0.3±0.7%Ba | 0.1±0.2%Ba | 1.0 | 6 | 351 | 5±2 | 9±12 | 0±2 | 2±5 | 3±3 | 0±0 | 24.3±16.6%Aa | 2.0±2.1%Aab | 0.1±1.9%Aa | 1.5 | 7 | 278 | 2±2 | 6±12 | 1±2 | 5±5 | 4±3 | 0±0 | 21.8±16.6%Aa | 1.4±2.1%Bab | 0.7±1.9%Ba | 2.0 | 4 | 245 | 6±6 | 6±10 | 0±0 | 4±6 | 7±7 | 0±0 | 30.7±8.7%Aa | 2.7±3.1%Bab | 3.5±3.7%Ba | 3.0 | 5 | 284 | 8±5 | 8±15 | 5±7 | 14±12 | 15±10 | 0±0 | 33.7±12.2%Aa | 6.4±6.5%Bb | 6.6±9.5%Ba | Conclusion: Multi-category patterns reported earlier for long-term posterior composite clinical trials (beyond 3y) were just beginning to be detected for short-term Class-V trials at 3y. Acknowledgment: Supported indirectly by GC-America, Dentsply-Caulk, Kerr, 3M-ESPE, and Ivoclar. |
