Non-Invasive Optical Coherence Tomography Data-Based Quantitative Algorithm for the Assessment of Residual Adhesive on Bracket-Removed Dental Surface

The aim of this study was to quantitatively assess the residual adhesive on orthodontic ceramic bracket-removed dental surface. In orthodontic process, ceramic bracket was repeated debonding physically, then the adhesive remained on the dental surface. The residual adhesive caused a lack of adhesive strength between dental and ceramic bracket. Since commonly used adhesive in orthodontics is translucent, residual adhesive is hard to be detected with conventional microscopes. Therefore, 1310 nm center wavelength swept-source OCT system based on laboratory customized image processing algorithm was used for the precise detection of residual adhesive on tooth surface. The algorithm separates residual adhesive from dental surface by comparing the height of adjacent B-scan images, while providing color-scaled images emphasizing the thickness information of residual adhesive. Finally, the acquired results were compared with microscopic and adhesive remnant index scoring gold standards, while the comparison confirmed the potential merits and the improvements of the proposed method over gold standards.

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A NEW AND MODERN DIGNOSTIC TECHNIQUE: SWEPT-SOURCE OPTICAL COHERENCE TOMOGRAPHY (SS-OCT)

CODS Journal of Dentistry ◽

10.5005/cods-5-2-31 ◽

2013 ◽

Vol 5 (2) ◽

pp. 31-33

Author(s):

Prakash Lokhande

Keyword(s):

Optical Coherence Tomography ◽

High Resolution ◽

Optical Imaging ◽

Optical Coherence ◽

Cross Sectional ◽

Swept Source ◽

Non Invasive ◽

Treatment Technologies ◽

High Resolution Images ◽

Swept Source Oct

ABSTRACT Innovative technique has been introduced in the field of dentistry for the purpose of diagnosis and treatment. Technologies like laser, composite curing techniques, optical imaging have been utilized in the field of dentistry. OCT(optical coherence tomography) is a recent. technique which creates cross-sectional high resolution images. SS-OCT(Swept -Source optical coherence tomography) is a variant of optical coherence tomography, which provides instant imaging with high resolution, non-invasive and ease of handling. This article provides a overview of Swept -Source OCT and its application in the field of dentistry.

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Evaluating posterior vitreous detachment by widefield 23-mm swept-source optical coherence tomography imaging in healthy subjects

Scientific Reports ◽

10.1038/s41598-021-99372-z ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Yoshiaki Chiku ◽

Takao Hirano ◽

Yoshiaki Takahashi ◽

Ayako Tuchiya ◽

Marie Nakamura ◽

...

Keyword(s):

Optical Coherence Tomography ◽

Healthy Subjects ◽

Posterior Vitreous Detachment ◽

Internal Limiting Membrane ◽

Optical Coherence ◽

Swept Source ◽

Vitreous Detachment ◽

Swept Source Oct ◽

B Scan Images ◽

Sd Oct

AbstractPosterior vitreous detachment (PVD) is a separation between the posterior vitreous cortex and internal limiting membrane. Although PVD was historically considered an acute event, recent studies using spectral-domain optical coherence tomography (SD-OCT) revealed a gradual progression of PVD in healthy subjects. Although SD-OCT improved PVD studies, the narrow imaging angle and long examination time were problematic to allow wide angle capture. The Xephilio OCT-S1 (Canon), a swept-source OCT (SS-OCT) device, can obtain up to 23-mm of widefield B-scan images in a single acquisition. We used this widefield SS-OCT to quantitatively evaluate the PVD stage in 214 healthy subjects aged 4–89 years and determine whether PVD stages differ between the bilateral eyes of each patient. Age was significantly positively correlated with the overall PVD stage (ρ = 0.7520, P < 0.001). Interestingly, partial PVD occurred in children as young as 5 years, indicating that initial PVD onset may occur much earlier than previously reported. Furthermore, PVD stages of the bilateral eyes were highly consistent in 183 subjects (85.5%). Widefield 23-mm SS-OCT thus revealed that PVD started earlier than anticipated, and age was correlated with the symmetry of PVD stage. Widefield 23-mm SS-OCT may also be clinically useful for the evaluation of diseased eyes.

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Evaluating Posterior Vitreous Detachment By Widefield 23-mm Swept-Source Optical Coherence Tomography Imaging In Healthy Subjects

10.21203/rs.3.rs-653820/v1 ◽

2021 ◽

Author(s):

Yoshiaki Chiku ◽

Takao Hirano ◽

Yoshiaki Takahashi ◽

Ayako Tuchiya ◽

Marie Nakamura ◽

...

Keyword(s):

Optical Coherence Tomography ◽

Healthy Subjects ◽

Posterior Vitreous Detachment ◽

Internal Limiting Membrane ◽

Optical Coherence ◽

Swept Source ◽

Vitreous Detachment ◽

Swept Source Oct ◽

B Scan Images ◽

Sd Oct

Abstract Posterior vitreous detachment (PVD) is a separation between the posterior vitreous cortex and internal limiting membrane. Although PVD was historically considered an acute event, recent studies using spectral-domain optical coherence tomography (SD-OCT) revealed a gradual progression of PVD in healthy subjects. Although SD-OCT improved PVD studies, the narrow imaging angle and long examination time were problematic to allow wide angle capture. The Xephilio OCT-S1 (Canon), a swept source OCT (SS-OCT) device, can obtain up to 23-mm of widefield B-scan images in a single acquisition. We used this widefield SS-OCT to quantitatively evaluate the PVD stage in 214 healthy subjects aged 4–89 years and determine whether PVD stages differ between the bilateral eyes of each patient. Age was significantly positively correlated with overall PVD stage (ρ=0.7520, P<0.001). Interestingly, partial PVD occurred in children as young as 5 years old, indicating that initial PVD onset may occur much earlier than previously reported.Furthermore, PVD stages of the bilateral eyes were highly consistent in 183 subjects (85.5%). Widefield 23-mm SS-OCT thus revealed that PVD started earlier than anticipated, and age is correlated with the symmetry of PVD stage. Widefield 23-mm SS-OCT may also be clinically useful for the evaluation of diseased eyes.

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Bond Strength of Metallic or Ceramic Orthodontic Brackets to Enamel, Acrylic, or Porcelain Surfaces

Materials ◽

10.3390/ma13225197 ◽

2020 ◽

Vol 13 (22) ◽

pp. 5197

Author(s):

Mónica Pinho ◽

Maria C. Manso ◽

Ricardo Faria Almeida ◽

Conchita Martin ◽

Óscar Carvalho ◽

...

Keyword(s):

Bond Strength ◽

Thermal Cycling ◽

Dental Materials ◽

Surface Damage ◽

Adhesive Remnant Index ◽

Ceramic Surfaces ◽

Ceramic Brackets ◽

Ceramic Bracket ◽

Dental Surface ◽

The Aesthetic

Bonding strategies within different brackets and dental materials are still a challenge concerning adhesion and dental surface damage. This study compared the shear and tensile bond strength of orthodontic ceramic and metallic brackets to enamel, acrylic, and ceramic surfaces after thermal cycling. Dental surfaces were divided into three groups: enamel, ceramic, and acrylic. Each group received stainless-steel and ceramic brackets. After thermal cycling, specimens were randomly divided into two subgroups considering tensile (TBS) or shear bond strength (SBS) test. After the mechanical testing, scanning electron and optical microscopy were performed, and the adhesive remnant index (ARI) was determined. The two-way ANOVA full factorial design was used to compare TBS, SBS, and ARI on the surface and bracket type (α = 0.05). There were significant differences in TBS, SBS, and ARI values per surface (p < 0.001 and p = 0.009) and type of bracket (p = 0.025 and p = 0.001). The highest mean SBS values were recorded for a ceramic bracket bonded to an acrylic surface (8.4 ± 2.3 MPa). For TBS, a ceramic bracket bonded to acrylic showed the worst performance (5.2 ± 1.8 MPa) and the highest values were found on a metallic bracket bonded to enamel. The adhesion of metallic or ceramic brackets is enough for clinical practice although the damage of the enamel surface after debonding is irreversible and harmful for the aesthetic outcome of the teeth.

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Feasibility of peripheral OCT imaging using a novel integrated SLO ultra-widefield imaging swept-source OCT device

International Ophthalmology ◽

10.1007/s10792-021-01837-7 ◽

2021 ◽

Author(s):

Simrat K. Sodhi ◽

John Golding ◽

Carmelina Trimboli ◽

Netan Choudhry

Keyword(s):

Posterior Pole ◽

Field Of View ◽

Retinal Diseases ◽

Swept Source ◽

Full Field ◽

Swept Source Oct ◽

Oct Imaging ◽

Field Device ◽

Areas Of Interest ◽

Retinal Pathologies

Abstract Purpose To describe the feasibility of peripheral OCT imaging in retinal diseases using a novel full-field device. Methods A total of 134 consecutive eyes were referred and imaged on the Optos Silverstone swept-source OCT (SS-OCT) (Optos PLC; Dunfermline, UK). Scanning laser ophthalmoscope (SLO) images and the associated SS-OCT images were obtained in the posterior pole, mid-periphery or far periphery based on the nature of the referral and on new areas of interest observed in the optomap images at the time of imaging. Results A total of 134 eyes (96 patients) were enrolled in the study. One hundred and twenty-five eyes (91 patients) with 38 retinal pathologies were prospectively assessed and 9 eyes (5 patients) were excluded due to incomplete image acquisition. The average age of the subjects was 54 years (range 21–92 years). Thirty-nine out of 125 eyes (31%) had macular pathologies. Eighty-six out of 125 eyes (69%) had peripheral only pathologies, an area which cannot be visualized by standard OCT devices with a 50 degree field-of-view. Conclusions The ability to capture peripheral pathologies using an integrated SLO-UWF imaging with full-field swept-source provided high-grade anatomical insight that confirmed the medical and surgical management in a majority of cases. Its use in the mid- and far periphery provides a holistic clinical picture, which can potentially aid in the understanding of various retinal pathologies.

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Replacement of polyps with type 1 macular neovascularization in polypoidal choroidal vasculopathy imaged with swept source OCT angiography

American Journal of Ophthalmology Case Reports ◽

10.1016/j.ajoc.2021.101057 ◽

2021 ◽

Vol 22 ◽

pp. 101057

Author(s):

Mengxi Shen ◽

Qiyu Bo ◽

Minlu Song ◽

Xiaoshuang Jiang ◽

Zohar Yehoshua ◽

...

Keyword(s):

Polypoidal Choroidal Vasculopathy ◽

Oct Angiography ◽

Swept Source ◽

Swept Source Oct ◽

Swept Source Oct Angiography ◽

Choroidal Vasculopathy

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Effectiveness of Riboflavin and Rose Bengal Photosensitizer Modified Adhesive Resin for Orthodontic Bonding

Pharmaceuticals ◽

10.3390/ph14010048 ◽

2021 ◽

Vol 14 (1) ◽

pp. 48

Author(s):

Ali Alqerban

Keyword(s):

Mtt Assay ◽

Rose Bengal ◽

Antibacterial Properties ◽

Homogenization Method ◽

Tooth Surface ◽

Control Group ◽

Adhesive Resin ◽

Adhesive Remnant Index ◽

Significant Difference ◽

Sem Imaging

This study aimed to evaluate the effect of riboflavin (RF) and rose Bengal (RB) photosensitizer modified adhesive resin on the degree of conversion (DC), and antimicrobial capacity after bonded to tooth surface. Different concentrations of RB and RF were prepared by homogenization method. An ultraviolet light source A (UVA) (375 nm wavelength, 3 mW/cm2 power) was used for 30 min irradiation.FTIR was performed for control and test adhesives to analyze the DC. Antibacterial testing was performed using the MTT assay. Metal brackets were bonded using the modified adhesives and subjected for SEM examination. The surfaces of teeth and metal brackets were examined at ×10 magnification for assessing adhesive remnant index (ARI) after PDT, 24 h and thermocycling. For DC, control group, 0.1% RB and RF after PDT showed the highest value. SEM imaging indicated lowest growth of Streptococcus mutans over 0.5% of RB-PDT and RF-PDT as compared to the control group. The MTT assay outcomes reported that the activity of S. mutans substantially decreased with the addition of a high amount of either RB or RF (p < 0.01). Mean ARI scores showed a significant difference between all groups. This study concluded that 0.1% of either RB or RF after PDT can be used for bonding orthodontic brackets to the tooth surface with substantial antibacterial properties.

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