Dental Literature Watch · Trial · Restorative
Single-Shade Composite Matches Multi-Shade at Three Years
TL;DR
- Single-shade "chameleon" composites promise to remove shade selection from the workflow. This trial asks whether you pay for that.
- Vittra Unique (one shade) versus Vittra APS (multi-shade), same manufacturer, in non-carious cervical lesions.
- No significant differences at 36 months on biological, functional, or aesthetic FDI criteria.
- Both were clinically acceptable throughout.
- Split-mouth, double-blind, equivalence design — the right architecture for this question.
The study
| Design | Randomised, controlled, double-blind, split-mouth equivalence trial |
| Sample | 60 patients with at least two non-carious cervical lesions; 120 restorations |
| Materials | Vittra Unique (single shade) vs Vittra APS (multi-shade) |
| Assessment | FDI criteria; Kaplan-Meier survival with log-rank, chi-square for other parameters |
| Result | No significant differences at 36 months; both clinically acceptable |
💎 Insight — what this means chairside
The saving is inventory and decision time, not clinical quality
One syringe instead of a shade range, and no shade-taking step under operatory lighting.
Over a year of cervical restorations that is real, and this trial says it costs nothing measurable.
One syringe instead of a shade range, and no shade-taking step under operatory lighting.
Over a year of cervical restorations that is real, and this trial says it costs nothing measurable.
Cervical lesions are the friendly test case
A single-surface lesion surrounded by tooth on all sides is exactly where the chameleon effect works best.
A large anterior Class IV with an incisal edge and no surrounding tooth to blend into is a different problem and was not tested.
A single-surface lesion surrounded by tooth on all sides is exactly where the chameleon effect works best.
A large anterior Class IV with an incisal edge and no surrounding tooth to blend into is a different problem and was not tested.
Same manufacturer, both arms
That controls for filler chemistry and handling, which strengthens the comparison of the shade concept itself.
It also means the result belongs to this material pair rather than to single-shade composites generally.
That controls for filler chemistry and handling, which strengthens the comparison of the shade concept itself.
It also means the result belongs to this material pair rather than to single-shade composites generally.
⚠️ The catch
Equivalence in cervical lesions does not transfer to anterior aesthetics
The demanding case for shade matching is the visible anterior restoration in a patient who will inspect it in daylight.
This trial does not address that, and it is where single-shade materials are most often criticised.
The demanding case for shade matching is the visible anterior restoration in a patient who will inspect it in daylight.
This trial does not address that, and it is where single-shade materials are most often criticised.
One product pair
Single-shade composites vary considerably between manufacturers in how the blending effect is achieved.
Do not generalise this to whichever chameleon material your rep is offering.
Single-shade composites vary considerably between manufacturers in how the blending effect is achieved.
Do not generalise this to whichever chameleon material your rep is offering.
⚡ Bottom line
- Non-carious cervical lesions → single-shade performed equivalently at three years.
- Simplifying inventory → supported for this indication.
- Large anterior aesthetic case → not tested here. Take a shade.
- Different brand of single-shade → different material. This result does not automatically carry over.
🧪 Questions
Tap an answer — instant grade, deciding line, and the trap.
You are restoring two non-carious cervical lesions on maxillary premolars in a 48-year-old. Based on the 2026 36-month randomised trial, which statement is most accurate?
Deciding line: the trial was a split-mouth equivalence design in non-carious cervical lesions and found no significant differences on biological, functional, or aesthetic FDI criteria at 36 months. Trap: the last option is the engineered trap because it takes a genuine equivalence result and stretches it beyond the tested indication, and the demanding anterior Class IV case is precisely where the chameleon effect has least surrounding tooth to blend into.