Effect of Photo-Fenton Bleaching on Tetracycline-stained Dentin in vitro

Bennett, Zackary Yale; Walsh, Laurence J.

doi:10.5005/jp-journals-10024-1648

Cited by 8 publications

(9 citation statements)

References 17 publications

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“…This principle is the basis for using intense green light from green LED arrays or KTP lasers as a clinical treatment for reversing discolouration caused by the systemic use of tetracyclines during tooth formation (De Moor et al, 2015;Walsh et al, 2004). The same effect was first shown in the laboratory using aqueous solutions (Davies et al, 1979;Lin et al, 1988), and in 2015, it was demonstrated using roots with profound staining induced by demeclocycline, when treated with visible green light from a KTP laser or an array of green LEDs (Bennett & Walsh, 2015a, 2015b.…”

Section: Lightsupporting

confidence: 57%

“…When this happens, the luminosity of the tooth will reduce. Measuring luminosity can be used to track the darkening of tooth structure, while analysing the individual red, green and blue colour channels of digital images can reveal if there are changes in the fundamental hue of teeth because of treatment (Bennett & Walsh, 2015a).…”

Section: Interactions Of Light With Teethmentioning

confidence: 99%

“…The first relevant considerations are a constant sample to camera distance and a standard background. This background may also include a colour standard (such as a cyan, magenta, yellow and black colour reference tabs) that is included in each image as an internal control to verify correct image exposure conditions (Bennett & Walsh, 2015a). Samples of teeth, roots and dentine slices can be positioned in a reproducible manner using templates made from vinyl polysiloxane or silicone dental impression material.…”

Section: Assessing Colour Changesmentioning

confidence: 99%

See 2 more Smart Citations

A critical analysis of research methods and experimental models to study tooth discolouration from endodontic materials

2022

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As a range of materials used in endodontics may cause tooth discolouration, exploration of factors responsible for the darkening of the tooth crown or root is warranted. This narrative review paper discusses the range of technical factors that apply in laboratory studies that assess endodontic discolouration. As an example of how these factors operate, particular examples relating to discolouration caused by endodontic medicaments containing tetracycline antibiotics are used. Following the PRILE 2021 guideline approach, a summary of key variables to be addressed in the methodology for laboratory studies is presented, to inform future work.

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Section: Lightsupporting

confidence: 57%

Section: Interactions Of Light With Teethmentioning

confidence: 99%

Section: Assessing Colour Changesmentioning

confidence: 99%

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A critical analysis of research methods and experimental models to study tooth discolouration from endodontic materials

2022

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“…Image analysis was undertaken using Adobe Photoshop™ CS6 Extended software, to track changes in each root over time and to calculate the colour change in red and green channels from the baseline by using a repeated measures assessment. The colour channel analysis method used was similar to that employed in previous studies [ 8 , 9 , 10 ]. The selected areas of interest were located at 250 and 500 μm from the root canal walls in a straight line.…”

Section: Methodsmentioning

confidence: 99%

Comparison of Commercial Calcium Hydroxide Pastes for Prolonged Antibacterial Effect using a Colourimetric Assessment

Teoh

Athanassiadis²,

Walsh

2018

Materials

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The anti-microbial activity of calcium hydroxide pastes used in endodontics is dependent on establishing high levels of hydroxyl ions in dentine. This study investigated hydroxyl ion diffusion from different commercial calcium hydroxide pastes using a novel colourimetric method. In this method, human tooth roots were stained with anthocyanin dye, which changed their colour according to the local pH conditions. Prepared root canals were filled with pastes formulated with the vehicle of water (Pulpdent™, Calasept Plus™), polyethylene glycol (PEG) (Calmix™) or a mixture of water, PEG and ibuprofen (Odontocide™). The changes in dye colour at fixed distances from the canal wall were monitored using standardised digital photography over a period of 3 weeks. A repeated measures analysis tracked changes in each root from baseline. Release of hydroxyl ions varied between the different commercial compositions containing water or PEG as solvents. The colour changes in the dentine, due to released hydroxyl ions, were greatest and more prolonged for completely non-aqueous compositions, when using PEG 400 as the vehicle. When water was present in the product, the duration of the pH changes was shorter. This was attributed to the presence of hydroxyl ions in the water (the common-ion effect) and a more vigorous buffering of hydroxyl ions by dentine proteins.

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“…The colour channel analysis method used was similar to that employed in previous studies. [126][127][128] An example of the analysis method is shown in Appendix A, Fig. A3.…”

Section: Tracking Colour Changes In Root Dentine Over Timementioning

confidence: 99%

Selected performance characteristics of non-aqueous alkaline endodontic materials

Teoh¹

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During root canal treatment, the root canal of a tooth is prepared, disinfected and filled. Alkaline materials have been used in endodontics for many years mainly as medicament pastes rather than for obturation of the root canal system. Calcium hydroxide, the most commonly used alkaline material in dentistry, releases hydroxyl ions which cause disinfection of the root canal system. The first part of this thesis examines the use of calcium hydroxide in non-aqueous solvents and compares this to calcium hydroxide in traditional water-based solvents. The novel use of anthocyanin as an indicator allowed tracking of diffusion of hydroxyl ions through root dentine.The discovery of calcium hydroxide-induced polymerisation of certain organic compounds such as glycerol to form a hard setting alkaline cement opens the possibility of using these materials for short or long term obturation of the root canal. In the second part of the thesis, a bacterial leakage study was carried out to compare the sealing capabilities of various root filling materials including this novel hard-setting alkaline cement as well as mineral trioxide aggregate (MTA) cements, which release calcium hydroxide from their setting reaction, and traditional epoxy resin sealers.In the third part of the thesis, the root fillings were then assessed in terms of their removability, a parameter which is relevant both for post space preparation and in the event that retreatment is required. Materials were tagged with a fluorescent label and then confocal laser scanning microscopy was used to assess the extent of remnant material and the cleanliness of the root canal walls.The results from Part 1 indicated that hydroxyl ion release into root dentine is greater with non-aqueous solvents, resulting in a sustained level of high alkalinity within the root.This feature should provide longer disinfection and should therefore reduce the number of inter-appointment visits clinically. In Part 2, bacterial leakage studies demonstrated that alkaline cements had greater sealing capabilities than commonly used epoxy resin sealers. This is most likely due to the antibacterial actions of hydroxyl ions released from alkaline cements. In Part 3 of the thesis, with regards to removability using rotary instrumentation, the novel hard-setting calcium hydroxide cement was more easily removed than MTA 3 cements or epoxy resin sealers, with the latter coating half of the canal walls after instrumentation.Overall, the findings from this thesis show that while calcium hydroxide pastes based on water are an integral and long standing part of root canal disinfection, the potential use of calcium hydroxide in dentistry is wider than its current applications. The research from this thesis shows that calcium hydroxide in non-aqueous solvents may be suitable for use as a disinfecting medicament and that when incorporated into a cement it may have properties that are well suited to being used in obturation of the root canal.4

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Effect of Photo-Fenton Bleaching on Tetracycline-stained Dentin in vitro

Cited by 8 publications

References 17 publications

A critical analysis of research methods and experimental models to study tooth discolouration from endodontic materials

A critical analysis of research methods and experimental models to study tooth discolouration from endodontic materials

Comparison of Commercial Calcium Hydroxide Pastes for Prolonged Antibacterial Effect using a Colourimetric Assessment

Selected performance characteristics of non-aqueous alkaline endodontic materials

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