What was tested
Daya Srinivasan, Shoba Narayan, Akshara Suresh and Shreya Sridharan at Chettinad Dental College and Research Institute, Chennai, ran a single-center, double-blinded randomized controlled trial comparing three pulpotomy agents in vital young permanent teeth (DOI 10.5005/jp-journals-10005-3643, International Journal of Clinical Pediatric Dentistry, 19(9):1135-1141, published 30 September 2026). The trial is registered with the Clinical Trials Registry of India (CTRI/2023/10/058204) and was funded by an Indian Society of Pedodontics and Preventive Dentistry research grant. Sixty children aged 7 to 9, screened from 75, had permanent mandibular first molars with deep carious lesions, symptoms of reversible pulpitis, and root development at Nolla stage 7 or 8. They were allocated 20 per arm to PRF alone, PRF mixed 3:1 with nanohydroxyapatite (nHA), or PRF mixed 3:1 with nanochitosan (nC), placed after partial or complete coronal pulpotomy per the Cvek criteria, with a glass ionomer base and composite restoration. PRF followed Choukroun’s protocol (5 mL blood, 3,000 rpm, 10 minutes). Participants and outcome assessors were blinded; all 60 were evaluated at 3, 6, 9 and 12 months with no attrition.
What they found
Clinical events were rare in all three arms. Postoperative pain at 3 months occurred in 5 of 20 teeth (25 percent) with PRF alone and in none of the nano-augmented arms (p = 0.0471). Tenderness on percussion appeared in 4 of 20 (20 percent) of the PRF plus nHA teeth at 3 months and in 5 of 20 (25 percent) of the PRF teeth at 6 months, and never in the PRF plus nC arm. No tooth in any arm showed periapical inflammation, periapical radiolucency, or root resorption at any timepoint. The separation was radiographic. Periodontal ligament widening at 3 and 6 months was seen in 20 of 20 PRF teeth and 20 of 20 PRF plus nC teeth, against 0 of 20 PRF plus nHA teeth (p less than 0.001 for both comparisons). By 12 months, 90 percent of the PRF plus nHA teeth showed complete or near-complete apical closure with significant root dentin wall thickening, versus partial closure in 70 percent of PRF plus nC and 60 percent of PRF teeth, with between-group differences reported at p less than 0.001.
What it does not show
The endpoint is radiographic. Apical closure and dentin thickening were graded on serial periapical radiographs, and no histology was performed, so the tissue behind the denser images is inferred, not examined. The sample is 20 teeth per arm at one center over 12 months, and the authors themselves flag the limited power and generalizability. The trial does not include a mineral trioxide aggregate or calcium silicate arm, so it ranks PRF variants against each other, not against the current standard of care. Blinding covered participants and outcome assessors, not the operators, who prepared the materials. Canal obliteration, a known tradeoff of nHA pulpotomy reported by Eid and colleagues in a 2022 trial the authors cite, was not an outcome here. And 12 months is a short horizon for a procedure whose rationale is lifelong root integrity.
Where it sits in the field
For the pulp and dentin repair program, this is the autologous-biologic wing of vital pulp therapy moving one step past plain PRF. The useful result is not that a nanomaterial beats PRF, which earlier comparisons had already hinted at, but that a 3:1 PRF plus nHA mix produced a radiographic maturation gradient (90 versus 60 percent apical closure) large enough to clear p less than 0.001 in a randomized design, which puts it among the sharper effect sizes in this literature. It sits alongside, not above, the route’s cell-based results, such as the recent freeze-dried bone marrow cell preparation in sheep pulpotomy (our analysis): both aim at the same bottleneck, getting an immature root to finish growing, one with growth factors plus a mineral phase, the other with paracrine signals. It qualifies rather than strengthens the human tier: one center, radiographic endpoints, a pediatric caries population in a middle-income setting. The current field assessment stands at /field/.
Where we differ from the coverage
We found no press or popular coverage of this paper to differ from. Against the paper’s own abstract and conclusion, we hold back the word “superior” as a blanket claim, and with it the phrase “first-line treatment.” Superiority here is endpoint-dependent. The PRF plus nHA arm won on apical closure and dentin thickening, but it was also the only augmented arm with tenderness events (4 of 20 at 3 months), while the PRF plus nC arm recorded zero pain and zero tenderness across all four visits and matched PRF plus nHA on every clinical complication measure. A clinician reading this trial sees a radiographic winner and a clinically quiet arm that are not the same arm, in a study of 60 children whose radiographs were read without histological ground truth. “Superior” belongs to the radiographic endpoint, with the sample size and single center stated beside it.
Provenance: source read in full (publisher PDF), methods and numbers as reported there. Selection and review procedure: /method/.