Influence of chlorhexidine and zinc oxide in calcium hydroxide pastes on pH changes in external root surface

Lima, Thiago Farias Rocha; Ascendino, Juliane Fabrício; Cavalcante, Isabelly de Oliveira; Assunção, Fabio Luiz Cunha D; Salazar-Silva, Juan Ramon; Silva, Emmanuel João Nogueira Leal; Lemos, Sherlan G.; Soares, Adriana de Jesus

doi:10.1590/1807-3107bor-2019.vol33.0005

Cited by 5 publications

(2 citation statements)

References 38 publications

(46 reference statements)

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“…Due to dentin decalcification, these substances produce nonstandardized erosions simulating clinical resorptions. In other studies, simulations of both internal and external root resorptions were conducted by using multi-bladed burs of different calibers [6,8,10,11] however, resorptions made by using these methods are uniform and circular, and hardly resemble real format of the lesion [1].…”

Section: Discussionmentioning

confidence: 99%

Imaginologic resources used in diagnosis of root resorptions: comparative study

CERQUEIRA

Simões

Cangussú

et al. 2022

RGO, Rev. Gaúch. Odontol.

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Objective: Compare the accuracy of early diagnosis of simulated internal root resorptions and external root resorption, using digital periapical radiography and cone beam computed tomography. Methods: Root resorption were simulated in extracted human teeth by demineralization with 5% nitric acid solution and 8% Sodium Hypochlorite in different periods (1 and 5 days). For the group external root resorption (n=12) composite resin cylinders were positioned on middle third of buccal surface of roots, to delimit application of demineralization substances. In group internal root resorptions (n=12) the teeth were sectioned longitudinally, and the composite resin cylinders were positioned in the middle third of root canals. The teeth were mounted in a dry mandible and evaluated by digital radiography and tomography. The images were evaluated by two examiners. Results: Analyzing the tomographic images in period of 1 day, the examiner 2 identified internal root resorptions that were not identified in radiographic images (p<0.05). No examiner was capable of diagnosing external root resorption irrespective of exam, in the group of 1 day (p>0.05). In 5 day period of induction, both exams identified internal root resorptions (p>0.05), however, the tomographic images were more effective in identifying external root resorption (p <0.05) for both examiners. Conclusion: Cone beam computed tomography was shown to be more effective than digital periapical radiography for detecting internal root resorptions with 1 day of induction. The imaginological resources used in this study were not able to early detect external root resorption.

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Section: Discussionmentioning

confidence: 99%

Imaginologic resources used in diagnosis of root resorptions: comparative study

CERQUEIRA

Simões

Cangussú

et al. 2022

RGO, Rev. Gaúch. Odontol.

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“…Regardless of the vehicle used, one of the challenges for apexification using Ca(OH) 2 pastes involves the need for periodic changes of the intracanal dressing. To solve this limitation, other long-term medications have been proposed, such as a combination of Ca(OH) 2 , zinc oxide (ZnO), and chlorhexidine [ 7 8 9 ]. The formulation of this paste is based on a proportional mixture, in which Ca(OH) 2 is dissolved in a few weeks and ZnO acts as an inert sealing material [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Calcium-doped zinc oxide nanocrystals as an innovative intracanal medicament: a pilot study

et al. 2022

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Objectives This study investigated the cytotoxicity, radiopacity, pH, and dentinal tubule penetration of a paste of 1.0% calcium-doped zinc oxide nanocrystals (ZnO:1.0Ca) combined with propylene glycol (PRG) or polyethylene glycol and propylene glycol (PEG-PRG). Materials and Methods The pastes were prepared by mixing calcium hydroxide [Ca(OH) 2 ] or ZnO:1.0Ca with PRG or a PEG-PRG mixture. The pH was evaluated after 24 and 96 hours of storage in deionized water. Digital radiographs were acquired for radiopacity analysis and bubble counting of each material. The materials were labeled with 0.1% fluorescein and applied to root canals, and images of their dentinal tubule penetration were obtained using confocal laser scanning microscopy. RAW264.7 macrophages were placed in different dilutions of culture media previously exposed to the materials for 24 and 96 hours and tested for cell viability using the MTT assay. Analysis of variance and the Tukey test ( α = 0.05) were performed. Results ZnO:1.0Ca materials showed lower viability at 1:1 and 1:2 dilutions than Ca(OH) 2 materials ( p < 0.0001). Ca(OH) 2 had higher pH values than ZnO:1.0Ca at 24 and 96 hours, regardless of the vehicle ( p < 0.05). ZnO:1.0Ca pastes showed higher radiopacity than Ca(OH) 2 pastes ( p < 0.01). No between-material differences were found in bubble counting ( p = 0.0902). The ZnO:1.0Ca pastes had a greater penetration depth than Ca(OH) 2 in the apical third ( p < 0.0001). Conclusions ZnO:1.0Ca medicaments presented higher penetrability, cell viability, and radiopacity than Ca(OH) 2 . Higher values of cell viability and pH were present in Ca(OH) 2 than in ZnO:1.0Ca.

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