scholarly journals Optical evaluation of enamel white spot lesions around orthodontic brackets using swept-source optical coherence tomography (SS-OCT): An in vitro study

2019 ◽  
Vol 38 (1) ◽  
pp. 22-27
Author(s):  
Pavethynath VELUSAMY ◽  
Yasushi SHIMADA ◽  
Zuisei KANNO ◽  
Takashi ONO ◽  
Junji TAGAMI
Keyword(s):  
Optical Coherence Tomography ◽  
Orthodontic Brackets ◽  
White Spot ◽  
Optical Coherence ◽  
White Spot Lesions ◽  
Swept Source

scholarly journals Observation of white spot lesions using swept source optical coherence tomography (SS-OCT): in vitro and in vivo study

2015 ◽  
Vol 34 (4) ◽  
pp. 545-552 ◽  
Author(s):  
Takahide IBUSUKI ◽  
Yuichi KITASAKO ◽  
Alireza SADR ◽  
Yasushi SHIMADA ◽  
Yasunori SUMI ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
White Spot ◽  
Optical Coherence ◽  
White Spot Lesions ◽  
Swept Source

scholarly journals Enamel Thickness before and after Orthodontic Treatment Analysed in Optical Coherence Tomography

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Julia Seeliger ◽  
Monika Machoy ◽  
Robert Koprowski ◽  
Krzysztof Safranow ◽  
Tomasz Gedrange ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Orthodontic Treatment ◽  
Adhesive Bonding ◽  
Orthodontic Brackets ◽  
Optical Coherence ◽  
Two Dimensional ◽  
Enamel Thickness ◽  
Bonding System ◽  
Before And After

Despite the continuous development of materials and techniques of adhesive bonding, the basic procedure remains relatively constant. The technique is based on three components: etching substance, adhesive system, and composite material. The use of etchants during bonding orthodontic brackets carries the risk of damage to the enamel. Therefore, the article examines the effect of the manner of enamel etching on its thickness before and after orthodontic treatment. The study was carried out in vitro on a group of 80 teeth. It was divided into two subgroups of 40 teeth each. The procedure of enamel etching was performed under laboratory conditions. In the first subgroup, the classic method of enamel etching and the fifth-generation bonding system were used. In the second subgroup, the seventh-generation (self-etching) bonding system was used. In both groups, metal orthodontic brackets were fixed and the enamel was cleaned with a cutter fixed on the micromotor after their removal. Before and after the treatment, two-dimensional optical coherence tomography scans were performed. The enamel thickness was assessed on the two-dimensional scans. The average enamel thickness in both subgroups was not statistically significant.

scholarly journals Preventive effect of fluoridated orthodontic resins subjected to high cariogenic challenges

2010 ◽  
Vol 21 (3) ◽  
pp. 211-215 ◽  
Author(s):  
Paula Passalini ◽  
Tatiana Kelly da Silva Fidalgo ◽  
Erika Machado Caldeira ◽  
Rogerio Gleiser ◽  
Matilde da Cunha Gonçalves Nojima ◽  
...  
Keyword(s):  
Color Change ◽  
Artificial Saliva ◽  
Orthodontic Brackets ◽  
White Spot ◽  
White Spot Lesion ◽  
White Spot Lesions ◽  
Preventive Effect ◽  
Ph Cycling ◽  
Inhibition Zones

The aim of the present study was to evaluate the in vitro caries preventive effect of fluoridated orthodontic resins under pH cycling with two types of acid demineralizing saliva. Brackets were bonded to 60 bovine incisors, using either Transbond Plus Color Change (n=30) or Orthodontic Fill Magic (n=30) orthodontic resins. Each group of resin was divided into 3 subgroups (n=10): immersion in remineralizing artificial saliva for 14 days, pH cycling with high cariogenic challenge in acid saliva with pH 5.5, and acid saliva with pH 4.5. After 14 days of pH cycling, the caries preventive effect on the development of white spot lesion was evaluated considering the presence of inhibition zones to white spot lesions using two scores: 0= absence and 1= presence. Kruskal Wallis and Mann-Whitney tests (a=0.05) were used. Formation of white spot lesions was observed only under pH cycling using acid saliva with pH 4.5; with Transbond Plus Color Change being significantly more effective (p<0.05) in preventing the appearance of white spot lesions effect than Orthodontic Fill Magic. The acidity of the demineralizing solution influenced the formation of white spot lesions around orthodontic brackets under highly cariogenic conditions. Transbond Plus Color Change resin presented higher caries preventive effect than Orthodontic Fill Magic.

scholarly journals Assessment of Demineralization Inhibition Effects of Dentin Desensitizers Using Swept-Source Optical Coherence Tomography

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1876
Author(s):  
Kumiko Matsuzaki ◽  
Yasushi Shimada ◽  
Yasuo Shinno ◽  
Serina Ono ◽  
Kozo Yamaji ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Silicate Glass ◽  
Signal Intensity ◽  
Chemical Elements ◽  
Region Of Interest ◽  
Optical Coherence ◽  
Cross Sectional ◽  
Swept Source ◽  
Morphological Differences

The purpose of this study was to evaluate the mechanism of action and the inhibiting effects of two types of desensitizers against dentin demineralization using pre-demineralized hypersensitivity tooth model in vitro. In this study, we confirmed that a hypersensitivity tooth model from our preliminary experiment could be prepared by immersing dentin discs in an acetic acid-based solution with pH 5.0 for three days. Dentin discs with three days of demineralization were prepared and applied by one of the desensitizers containing calcium fluoro-alumino-silicate glass (Nanoseal, NS) or fluoro-zinc-silicate glass (Caredyne Shield, CS), followed by an additional three days of demineralization. Dentin discs for three days of demineralization (de3) and six days of demineralization (de6) without the desensitizers were also prepared. The dentin discs after the experimental protocol were scanned using swept-source optical coherence tomography (SS-OCT) to image the cross-sectional (2D) view of the samples and evaluate the SS-OCT signal. The signal intensity profiles of SS-OCT from the region of interest of 300, 500, and 700 µm in depth were obtained to calculate the integrated signal intensity and signal attenuation coefficient. The morphological differences and remaining chemical elements of the dentin discs were also analyzed using scanning electron microscopy and energy-dispersive X-ray spectroscopy. SS-OCT images of CS and NS groups showed no obvious differences between the groups. However, SS-OCT signal profiles for both the CS and NS groups showed smaller attenuation coefficients and larger integrated signal intensities than those of the de6 group. Reactional deposits of the desensitizers even after the additional three days of demineralization were observed on the dentin surface in NS group, whereas remnants containing Zn were detected within the dentinal tubules in CS group. Consequently, both CS and NS groups showed inhibition effects against the additional three days of demineralization in this study. Our findings demonstrate that SS-OCT signal analysis can be used to monitor the dentin demineralization and inhibition effects of desensitizers against dentin demineralization in vitro.

scholarly journals In Vitro Comparison of Fluoride, Magnesium, and Calcium Phosphate Materials on Prevention of White Spot Lesions around Orthodontic Brackets

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Selda Lale ◽  
Hikmet Solak ◽  
Evren Hınçal ◽  
Levent Vahdettin
Keyword(s):  
Orthodontic Brackets ◽  
White Spot ◽  
Tooth Surface ◽  
White Spot Lesions ◽  
Surface Appearance ◽  
Time Points ◽  
Fluoride Toothpaste ◽  
Hygiene Practices ◽  
Fixed Appliances

One common negative side effect of orthodontic treatment with fixed appliances is the development of white spot lesions (WSLs) around brackets. This study is aimed at comparing the efficacy of various oral hygiene practices in preventing enamel demineralization around orthodontic brackets under similar in vitro conditions. The study included 90 extracted bovine incisors, which were randomized into six groups: fluoride toothpaste (FT), nonfluoride toothpaste (NFT), fluoride varnish plus fluoride toothpaste (FV+FT), CPP-ACP varnish plus fluoride toothpaste (CPP-ACP+FT), medical minerals gel plus nonfluoride toothpaste (MMG+NFT), and no intervention (control). All groups were subjected to demineralization and remineralization cycles. Visual appraisals were used to evaluate the changes in the enamel surface appearance at the beginning and end of the experiment. The changes in the demineralization degree were evaluated by measuring the Ca+2 concentration in the demineralization solution at different time points. The majority of teeth in the CPP-ACP+FT group exhibited no shift in appearance, whereas in the other groups, a slight change in enamel translucency was observed. At all the time points, the Ca+2 concentration in the demineralization solution in the CPP-ACP+FT group was the least among all other groups. At day 5, MMG+NFT’s preventive efficacy was significantly higher than FV+FT’s, but at days 10, 15, and 19, their efficacy was similar. However, at all the time points, MMG+NFT’s efficacy was significantly higher than that of control, whereas FV+FT’s efficacy was decreased at days 10, 15, and 19 and was close to the efficacy of control. To fight WSLs, early diagnosis was of great importance and examination of the tooth surface after air-drying for 5 s was recommended.

Validation of swept source optical coherence tomography (SS-OCT) for the diagnosis of smooth surface caries in vitro

2013 ◽  
Vol 41 (1) ◽  
pp. 80-89 ◽  
Author(s):  
Hisaichi Nakagawa ◽  
Alireza Sadr ◽  
Yasushi Shimada ◽  
Junji Tagami ◽  
Yasunori Sumi
Keyword(s):  
Optical Coherence Tomography ◽  
Smooth Surface ◽  
Optical Coherence ◽  
Swept Source
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