{ "title": "Sr-Ca-Ba-TiO_3 Toothpaste - Whitens & Remineralizes Teeth", "inventor_name": "Min Xing et al.", "publication_year": 2026, "device_name": "Ba_0._9Sr_0._0_0_0_0Ca_0._0_5TiO_3 (BSCT) piezoelectric ceramic powder", "goal": "To whiten teeth and promote remineralization of enamel and dentin.", "problem_addressed": "Tooth staining and de-mineralization (cavities) caused by organic pigments and bacterial activity.", "concept_summary": "A piezoelectric ceramic powder (BSCT) containing Ba, Sr, Ca and TiO_3 is applied to teeth and activated by mechanical vibration or ultrasonic stimulation. The piezoelectric effect generates reactive oxygen species (superoxide anion, hydroxyl radicals) that degrade organic stains and inhibit cariogenic bacteria, while released Ca^2^+ and Sr^2^+ ions create ion-enriched zones that foster hydroxyapatite formation and remineralization.", "detailed_description": "The invention details a sol-gel synthesis of Ba_0._9Sr_0._0_5Ca_0._0_5TiO_3 ceramic powder, followed by drying and heat-treatment (900 deg C, 2 h). The resulting ~80 nm particles exhibit a clear piezoelectric hysteresis loop. Under ultrasonic exposure (2 W, 40 min) the powder generates A*O_2^- and A*OH radicals, which were detected by ESR. In vitro tests showed fading of indigo-carmine dye, degradation of coffee/tea/tobacco stains, inhibition of bacterial membrane potential, and promotion of hydroxyapatite nucleation on enamel surfaces (XRD, SEM). Cytotoxicity assays with human gingival fibroblasts indicated good biocompatibility.", "category": "Medical & Dental Technologies", "principles": [ "Piezoelectric catalysis", "In-situ generation of reactive oxygen species", "Ion-release induced remineralization", "Microbial community regulation" ], "scientific_domains": [ "Materials Science", "Dentistry", "Chemistry", "Physics" ], "mechanisms_of_action": [ "Mechanical vibration induces piezoelectric polarization in BSCT powder", "Polarization drives formation of superoxide anion and hydroxyl radicals", "Radicals oxidatively degrade organic stains on tooth surfaces", "Ca^2^+ and Sr^2^+ ions released from the powder promote hydroxyapatite nucleation", "Piezoelectric field disrupts bacterial membrane potential, inhibiting ATP synthesis" ], "materials": [ "Barium acetate", "Strontium acetate", "Calcium acetate", "Tetrabutyl titanate", "Acetic acid", "Acetylacetone", "Ethylene glycol methyl ether", "Ba_0._9Sr_0._0_5Ca_0._0_5TiO_3 ceramic powder" ], "energy_sources": [ "Mechanical vibration", "Ultrasonic energy" ], "inputs": [ "BSCT powder", "Ultrasonic or mechanical stimulation", "Tooth surface (saliva, water)", "Ambient air (oxygen source)" ], "outputs": [ "Whitened tooth surface", "Remineralized enamel/dentin", "Reduced cariogenic bacterial load", "Generation of superoxide anion and hydroxyl radicals" ], "claimed_performance": "Active oxygen generation under ultrasonic stimulation leads to degradation of coffee/tea/tobacco stains, inhibition of cariogenic bacteria, and promotion of hydroxyapatite formation for lasting tooth whitening and mineralization.", "experimental_evidence": "ESR spectra showed superoxide and hydroxyl radical peaks after ultrasonic treatment; UV-Vis absorbance at 600 nm decreased with treatment time; SEM revealed crystalline deposits on enamel; XRD detected hydroxyapatite peaks; bacterial membrane potential disruption observed; fibroblast cytotoxicity assays indicated good biocompatibility.", "replication_status": "Not reported - experiments performed by the authors only.", "keywords": [ "Piezoelectric ceramic", "BaSrCaTiO_3", "Tooth whitening", "Remineralization", "Ultrasonic activation", "Reactive oxygen species" ], "related_technologies": [ "Piezoelectric ceramics", "Dental whitening agents", "Photocatalytic tooth powders", "Ultrasonic cleaning devices" ], "controversy_level": "low", "confidence_score": 0.9, "practicability_score": 0.8, "fringe_score": 0.2, "evidence_strength": 0.6, "risk_score": 0.2, "trl_estimate": 5, "source_urls": [ "http://rexresearch.com/", "http://rexresearch1.com/", "https://phys.org/news/2026-01-toothbrush-powder-whitens-teeth.html", "https://pubs.acs.org/doi/10.1021/acsnano.5c16997?goto=supporting-info", "CN119430910A.pdf" ], "organizations": [], "applications": [ "Home oral health care (toothpaste/ powder)", "Professional dental whitening and remineralization treatments" ], "limitations": [ "Requires ultrasonic or mechanical activation to generate reactive species", "Effectiveness may depend on duration/intensity of stimulation", "Scale-up of sol-gel synthesis for consumer-grade powder needs optimization", "Long-term oral safety and microbiome impact not fully studied" ], "open_questions": [ "How does continuous use affect the oral microbiome balance?", "What is the comparative efficacy versus conventional peroxide bleaching?", "Can the powder be formulated into a stable consumer product without external activation?", "What are the long-term effects of repeated ion release on enamel integrity?" ], "red_flags": [], "evidence_quotes": [ "After ultrasonic treatment, obvious superoxide radical peaks and hydroxyl radical peaks can be captured in BSCT powder, indicating that BSCT powder can generate A*O_2^- and A*OH after ultrasonic treatment.", "The ultrasonic instrument was set to 2 W, and the ultrasonic treatment lasted for 40 minutes... the blue color of the indigo carmine solution in the piezoelectric powder group gradually faded, and the absorbance intensity at 600 nm decreased with the extension of time.", "SEM results show that obvious crystalline particle deposits can be observed on the enamel and dentin surfaces of teeth treated with BSCT powder. The XRD results show the appearance of weak peaks attributed to hydroxyapatite, indicating that BSCT powder helps mineralize the tooth surface.", "The piezoelectric polarization field enhances antibacterial efficacy by disrupting the bacterial membrane potential and structural integrity, weakening the proton motive force (PMF), and subsequently inhibiting F_0F_1-ATP synthase activity to block ATP synthesis." ] }