En-face OCT microleakage investigation after laser-assisted dental hard tissue treatment

Summary Background/Aim: The chemical nature of soft drinks is acidic, so they possess the capacity to cause hard tissue erosion. The aim of this study is to assess the potentially erosive effect linked to pH and titratable acidity of some common soft drinks on dental hard tissues in prolonged time exposure. Material and Methods: Seven types of soft drinks in Romanian market were selected for this study. The pH and Titratable acidity were determined. Twenty one human dental hard tissue specimens were immersed in 5 ml solution each for 336h. Every 48h weight loss was determined for each specimen and after 336h volume changes were calculated. Enamel microhardness was determined using a Microhardness Tester model HV-1000 and compared to normal enamel microhardness. Results: The pH values of beverages ranged from 2.37 to 3.1, showing no significant differences. All specimens presented color and surface texture modifications, weight loss and volume reduction. There were found significant differences between the mean values of weight loss and enamel microhardness of each type of specimens and type of beverages tested. The most representative findings were achieved by indentations done in specific zones on Sprite® immersed specimen. This result suggest that microhardness near the eroded surface was significant lower than in other zones. Conclusions: Data obtained have shown that all the soft drinks tested had an erosive effect, causing dental hard tissue dissolution. For prolonged time exposure titratable acidity may be a major predictor for erosive potential. Dental erosion may affect different levels of enamel causing decreased enamel microhardness.

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ANALYSIS OF MACRO AND MICROELEMENTS IN TEETH, SALIVA, AND BLOOD OF WORKERS IN FERGANA CHEMICAL PLANT OF FURAN COMPOUNDS

European Medical Health and Pharmaceutical Journal ◽

10.12955/emhpj.v7i2.507 ◽

2014 ◽

Vol 7 (2) ◽

Author(s):

Sunnatillo Gaffarov ◽

Salim Sharipov

Keyword(s):

Chemical Elements ◽

Chemical Plant ◽

Ecological Environment ◽

Analysis Method ◽

Hard Tissue ◽

Dental Hard Tissue ◽

The People ◽

Microelement Composition ◽

Dental Diseases ◽

Neutron Activation Analysis Method

This article aims to share the results of research conducted in the Fergana chemical plant of furan compounds (FCPFC) in Uzbekistan.19 workers of the Furan compounds plant, in Fergana, Uzbekistan, were tested. By neutron activation analysis method, we have studied microelement composition of saliva, blood, dental hard tissue, and the level of Ca, Zn, Fe, and Ag in these subjects. We havedetected that the level of chemical elements in dental hard tissue, blood, and saliva of these workers was subject to negative changes as compared to the analysis results from those in the control group.The research results havepractical value for the prophylaxis, treatment, and health resumption of the people living in rugged ecological environment and workers who are engagedwith harmful substances in chemical industry. Furthermore,this research also provides recommendations fortreatment of dental diseases related to common conditions of pathophysiological processes carried out bylivingorganisms.

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Artifact Removed Quantitative Analysis Of Choriocapillaris Flow Voids

10.21203/rs.3.rs-178394/v1 ◽

2021 ◽

Author(s):

M. Giray Ersoz ◽

Mumin Hocaoglu ◽

Isil Sayman Muslubas ◽

Serra Arf ◽

Erdost Yildiz ◽

...

Keyword(s):

Optical Coherence Tomography Angiography ◽

Autosomal Dominant ◽

Pigment Epithelium ◽

Subretinal Fluid ◽

Outer Retina ◽

En Face Oct ◽

En Face ◽

Capillary Plexus ◽

Vitreous Opacities ◽

Superficial Capillary Plexus

Abstract Purpose: To investigate choriocapillaris flow voids (FV) with a new optical coherence tomography angiography (OCTA) image processing strategy to exclude artifacts due to vitreous opacities, subretinal pigment epithelium (sub-RPE) fluid and deposits, and subretinal fluid (SRF) by thresholding the en-face OCT image of the outer retina.Methods: This retrospective study included 15 eyes with drusen and 15 eyes with SRF. Number (FVn), average area (FVav), and maximum area (FVmax) of FV and the percentage of the nonperfused choriocapillaris area (PNPCA) obtained using the proposed strategy were compared with those obtained by removing only artifacts due to superficial capillary plexus (SCP).Results: There were three eyes with autosomal dominant drusen and 12 eyes with drusen secondary to non-exudative AMD in the drusen group. SRF group included 15 eyes with active central serous chorioretinopathy. PNPCA, FVav, FVmax, and FVn obtained using the algorithm were significantly lower than those obtained by removing only SCP in both groups (all p< 0.05). The algorithm was able to remove 94.7% of artifacts secondary to vitreous opacities and all artifacts secondary to serous pigment epithelial detachments. Conclusion: Nonperfusion areas of choriocapillaris may be overestimated in eyes with RPE abnormalities and SRF. These areas can be removed using thresholded images of the outer retina en-face OCT scans.

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Visualising the procedures in the influence of water on the ablation of dental hard tissue with erbium:yttrium–aluminium–garnet and erbium, chromium:yttrium–scandium–gallium-garnet laser pulses

Lasers in Medical Science ◽

10.1007/s10103-008-0571-1 ◽

2008 ◽

Vol 24 (3) ◽

pp. 365-374 ◽

Cited By ~ 23

Author(s):

Maziar Mir ◽

Norbert Gutknecht ◽

Reinhart Poprawe ◽

Leon Vanweersch ◽

Friedrich Lampert

Keyword(s):

Laser Pulses ◽

Hard Tissue ◽

Dental Hard Tissue ◽

Influence Of Water

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Swept-Source Optical Coherence Tomography Detecting Intraoperative Acute Descemet's Fold Formation

Case Reports in Ophthalmology ◽

10.1159/000447995 ◽

2016 ◽

Vol 7 (2) ◽

pp. 354-358

Author(s):

Yu Ichioka ◽

Akihito Uji ◽

Nagahisa Yoshimura

Keyword(s):

Optical Coherence Tomography ◽

Optical Coherence ◽

Swept Source ◽

En Face Oct ◽

En Face ◽

Descemet's Membrane ◽

Descemet’S Membrane ◽

Oct Imaging ◽

Fold Formation ◽

B Scan Images

Background: To present an intraoperative acute Descemet’s fold formation using swept-source optical coherence tomography (SS-OCT) imaging. Case Report: A 67-year-old man complaining of reduced visual acuity in the left eye. A 25-gauge pars plana vitrectomy combined with phacoemulsification cataract surgery was performed to remove the vitreomacular traction. When hydro-sealing was performed, striae rapidly spread in the cornea. SS-OCT B-scan images performed on postoperative day 1 revealed a wavy Descemet’s membrane that might correspond to Descemet’s folds. Pairs of hypo- and hyperreflective narrow lesions running from the wavy Descemet’s membrane to almost half of the thickness of the whole cornea were observed. En face OCT imaging clearly showed the stromal fold, which continuously spread from the Descemet’s fold. Conclusion: The stromal fold might be due to the focal bulge of the stroma posteriorly caused by the rapid volume increase of the stroma which could push Descemet’s membrane posteriorly, thereby forming a wavy Descemet’s membrane layer.

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