Does one-shade composite actually match? What the trials measured
Single-shade composites like OMNICHROMA against multi-shade layering — colour match and colour stability from four randomised trials, plus the measured translucency, radiopacity, strength, and polish that the shade claim does not cover. Every figure below is taken from the cited source — nothing is estimated or interpolated.
Clinically reviewed by Chithra Durgam, DDS on .
RD −0.01
difference in colour-match failures between single-shade and multi-shade composites at 12 months across four RCTs and 263 restorations (95% CI −0.09 to 0.07) — statistically indistinguishable [2024]
Low
GRADE certainty behind that finding at every follow-up, downgraded for imprecision and small sample size — four trials, none past 12 months [2024]
19.3 TP
OMNICHROMA's measured translucency, the highest of sixteen composites tested and well above Filtek Supreme Ultra at 13.1 and GrandioSO at 12.5 — the same property that makes it blend also lets a dark prep read through [2024]
0.2 µm
the surface-roughness threshold below which plaque accumulation drops — the target any polishing protocol is aiming at, whatever the shade system [2021]
The single-shade table
What was compared, over what follow-up, and what the source actually found — with the source for every line.
| Material or property | What was measured | What the evidence says | Verdict | Source |
|---|---|---|---|---|
| OMNICHROMA vs Tetric N-Ceram | Colour match and stability at 12 months (USPHS) | Comparable. Two randomised trials — 40 occlusal restorations in adult molars and premolars, and 50 full coronal restorations in primary anterior teeth — both found the single-shade composite performed similarly to the multi-shade control on colour match and colour stability at 6 and 12 months.Full clinical answer | Matches | 2024 |
| Filtek Universal vs Filtek Z350 XT | Class IV restorations at 3 days | Satisfactory shade matching against polychromatic layering in 26 permanent incisors. Three days is a colour-match reading, not a stability one — this trial says nothing about how the restoration ages. | Matches at baseline | 2024 |
| Admira Fusion x-tra vs Admira Fusion | Non-carious cervical lesions at 7 days (FDI) | Equivalent colour match in 120 restorations across 70 patients, using FDI criteria rather than USPHS. Again a short-horizon result — the single-shade material matched, but only baseline was assessed. | Matches at baseline | 2024 |
| The evidence base itself | How much should the no-difference finding be trusted? | Only so far. Four trials and 263 restorations, three at low risk of bias and one with concerns over blinding and allocation. Certainty was graded low at every follow-up for imprecision and small event counts, and no trial followed restorations beyond 12 months. All trials cured for 20 seconds per increment under absolute isolation. | Low certainty | 2024 |
| Why it matches | What produces the shade-taking effect? | 260 nm uniform spherical zirconia-silica fillers that reflect back yellow-to-red wavelengths — structural colour, not pigment. The same formulation gives OMNICHROMA the highest translucency of sixteen composites tested (19.3 TP; OMNICHROMA Flow 20.2, Flow Bulk 24.5), which is what lets surrounding tooth drive the colour. | Structural colour | 2024 |
| Radiopacity | How does it read on a bitewing? | Lowest of the sixteen composites measured: 1.2 mm aluminium equivalent for OMNICHROMA, 1.0 for OMNICHROMA Flow, and 0.8 for OMNICHROMA Flow Bulk, against 5.0 for Tetric EvoCeram, 3.2 for GrandioSO, and 1.8 for Filtek Supreme Ultra. The authors note the published composition lists no ytterbium fluoride. A restoration that reads close to dentine makes recurrent caries harder to call radiographically. | Lowest measured | 2024 |
| Strength and stiffness | What does the shade system cost mechanically? | OMNICHROMA measured 105.4 MPa flexural strength and 5.9 GPa elastic modulus, against 158.8 MPa / 13.2 GPa for Filtek Supreme Ultra and 160.4 MPa / 14.3 GPa for GrandioSO — the two highest-filled materials tested. Measured filler ran 65.6% for OMNICHROMA against 72.0% and 83.5% respectively. Filler weight predicted modulus strongly (r = 0.78) and strength only moderately (r = 0.46).Full clinical answer | Lower modulus | 2024 |
| Polishing system | Which protocol gets a composite smooth? | Multistep systems were most effective across 18 studies of nano-hybrid and nanofilled composites — Sof-Lex discs and Astropol named specifically — with aluminium oxide the abrasive that mattered most. Reported protocols ranged from 10 to 60 seconds at 10,000–30,000 rpm. The target is under 0.2 µm, below which plaque accumulation drops; a 0.3 µm change is detectable by the patient's tongue.Full clinical answer | Multistep wins | 2021 |
| Finish vs filler for staining | What actually drives discolouration? | The finishing protocol, more than the material. Against tea, red wine, and khat extract, Sof-Lex finish gave the least colour change for both a nanofill and a microhybrid, while mylar and white polishing stone finishes produced clinically unacceptable discolouration in every solution tested. Under a Sof-Lex finish only red wine crossed that line, and only past 48 hours.Full clinical answer | Finish decides | 2022 |
How to use this table
- The shade claim holds up as far as it has been tested: no measurable colour-match or colour-stability difference against multi-shade layering — but on four trials, 263 restorations, low certainty, and nothing past 12 months.
- What the trials did not test is where the tradeoffs sit. Translucency is the highest measured, radiopacity the lowest, and modulus roughly half that of the highest-filled conventional composites.
- Read those numbers against the case: high translucency is a liability over a dark or endodontically treated prep, and low radiopacity matters most where you will be reading margins on bitewings.
- Polish is the lever that is entirely yours. Finishing protocol changed staining more than filler type did, and a multistep aluminium-oxide system is what gets the surface under the 0.2 µm plaque threshold.
How this brief was built
Clinical rows report each randomised trial's own result for its own restoration type and follow-up, and carry the review's GRADE certainty rather than restating it as fact. Bench rows come from one laboratory that measured sixteen commercial composites side by side under ISO 4049, so the values are comparable to each other but are not manufacturer figures. Where the marketing claim and the measurement point different ways, the row shows both.
Cited sources
Where every figure comes from
Color Stability of Single-Shade Resin Composites in Direct Restorations: A Systematic Review and Meta-Analysis of Randomized Controlled Trials
Polymers · 2024 · Meta-analysis
Open the sourceCorrelation between Dental Composite Filler Percentage and Strength, Modulus, Shrinkage Stress, Translucency, Depth of Cure and Radiopacity
Materials · 2024 · Laboratory study
Open the sourceEffect of Polishing Systems on the Surface Roughness of Nano-Hybrid and Nano-Filling Composite Resins: A Systematic Review
Dentistry Journal · 2021 · Systematic review
Open the sourceEffect of finishing protocols and staining solutions on color stability of dental resin composites
Clinical and Experimental Dental Research · 2022 · Laboratory study
Open the source
Ask this against the live evidence.
This brief is a stored snapshot of the published literature. Run the search yourself for sources matched to the case in front of you.
This brief was compiled from the published reviews, guidelines, and trials listed above. Findings reflect each source’s own populations, materials, and test conditions.
Compiled on . Verify against current evidence and apply professional judgment before clinical use.