ArticleBMC oral health2026
Effect of 25% in-office hydrogen peroxide bleaching on flexural strength of resin-based composites: an in vitro study.
Article in BMC oral health, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
0 citing papers in PubMed.
No citing paper in PubMed yet.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
4 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundResin-based composites (RBCs) are commonly used in restorative dentistry, but bleaching agents may compromise their mechanical integrity. The effect of in-office bleaching with 25% hydrogen peroxide (HP) on the flexural strength (FS) of contemporary RBCs remains unclear. MATERIALS AND
methodsAn in vitro study was conducted using three resin composites: Beautifil II (giomer), Spectrum (microhybrid), and Omnichroma (universal). Seventy-two bar-shaped specimens (25 × 2 × 2 mm) were allocated into six groups (n = 12 each). Three groups served as unbleached controls representing giomer, microhybrid, and single-shade universal resin composites stored in distilled water. The other three groups were the corresponding bleaching subgroups, treated with 25% hydrogen peroxide gel activated in three 15-minute light-assisted cycles (total 45 min). Bleaching was performed with 25% HP gel (Philips Zoom) applied in three 15-min cycles with light activation. The FS was measured by three-point bending according to ISO 4049. The data were analyzed using two-way ANOVA and Tukey’s post hoc tests (p < 0.05).
resultsBleaching with 25% HP had no significant effect on FS across materials (p = 0.618). The resin composite type significantly influenced the FS (p < 0.001). Spectrum exhibited higher FS values than Beautifil II and Omnichroma, which were statistically similar.
conclusionIn-office bleaching with 25% HP did not reduce the FS of the tested RBCs. The material composition had a greater impact on FS than bleaching, with the microhybrid resin composite (Spectrum) performing better than the giomer and universal resin composites.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.