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Dicalcium Phosphate (CaHPO4·2H2O) Precipitation Through Ortho- Or Meta-Phosphoric Acid-Etching: Effects on the Durability and nanoleakage/ultra-morphology of Resin-Dentine Interfaces

Dicalcium Phosphate (CaHPO4·2H2O) Precipitation Through Ortho- Or Meta-Phosphoric Acid-Etching: Effects on the Durability and nanoleakage/ultra-morphology of Resin-Dentine Interfaces

Victor Pinheiro Feitosa, Maria Giulia Bazzocchi, Angelo Putignano, Giovanna Orsini, Arlinda Luzi Luzi, Mário Alexandre Coelho Sinhoreti, Timothy F Watson, Salvatore Sauro

J Dent. 2013 Nov;41(11):1068-80.

PMID: 23994709

Abstract:

Objectives:
To compare the effects of two etching procedures using meta-phosphoric (MPA) or ortho-phosphoric acid (OPA) on dentine demineralisation, resin-dentine bonds durability and interface nanoleakage/ultra-morphology.
Methods:
Middle-dentine specimens were etched using 37% OPA (15s) or 40% MPA (60s) and submitted to infrared spectroscopy (FTIR) or ultra-morphology dye-assisted (calcium-staining) confocal microscopy (Ca-CLSM). A three-step etch-and-rinse adhesive was formulated, applied onto dentine and light-cured for 30s before composite build-up. After 24h, the dentine-bonded specimens were cut into 1mm(2) beams; half were immediately submitted to microtensile bond strength (μTBS) and half stored in DW for six months. The μTBS results were analysed with repeated-measures ANOVA and Tukey's test (p<0.05). Further teeth were bonded and prepared for interface nanoleakage/ultra-morphology confocal evaluation.
Results:
FTIR and Ca-CLSM analyses showed dicalcium phosphate dihydrate (Brushite) precipitation in MPA-etched dentine and on the bottom (front of demineralisation) of the OPA-etched dentine. Statistical analysis showed similar μTBS for both etching procedures after 24h. The μTBS of specimens in OPA-group dropped significantly (p<0.05) after six month; the specimens in the MPA group showed no statistically difference (p>0.05). CLSM depicted no evident sign of nanoleakage within the resin-dentine interface of the MPA-treated specimens, while the specimens in OPA-group presented intense nanoleakage and interface degradation.
Conclusion:
The use of MPA (60s) as an alternative dentine conditioning agent in etch-and-rinse bonding procedures may be a suitable strategy to create more durable resin-dentine bonds.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP37267860	meta-Phosphoric acid		37267-86-0	Price

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