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This document summarizes an experiment studying the weight loss of fiber glass immersed in 10% NaOH and HCl solutions over 6 days. The results show that fiber glass loses weight more gradually in the basic NaOH solution compared to the acidic HCl solution, because protons in acid are smaller and diffuse more quickly, causing greater weight loss. Safety precautions for handling chemicals and proper lab techniques are also outlined.
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The effect of bleaching on enamel susceptibility to acid erosion and deminera...
Introduction The purpose of this in vitro study was to determine if
enamel that had been bleached by carbamide (urea) peroxide gel (CPG)
was at increased risk of either acid erosion or demineralisation (early
caries) than un-bleached enamel.
Methods Human incisors were employed. The samples were randomly
assigned to one of 4 groups; a) 10% CPG, b) 16% CPG, c) 22% CPG and d)
10% CPG with xylitol, fluoride and potassium. Each specimen was
moistened with saliva and the appropriate formulation placed for 2
hours for a total of 40 hours of exposure. In order to ensure that
bleaching had taken place, tooth shades were monitored using the
Shade-Eye device. Following the bleaching process, one half of the
specimen was subjected to an erosive challenge, the other to a
demineralisation system with one half of each sub-sample retained as a
non-bleached control. Samples were assessed longitudinally with
quantitative light-induced fluorescence (QLF) and at the conclusion of
the study with transverse micro-radiography (TMR)
Results Erosion was detected in all samples (ΔQ 126±23.4), in both
bleached and non-bleached areas. There was no statistical difference
between the bleached and non-bleached areas either within the
treatment groups or between them. Caries-like lesions were detected on
all samples; TMR revealed sub-surface lesions on all teeth and QLF data
supported this (ΔQ 89±18.9). Following statistical analysis there were no
differences detected between the bleached and non-bleached areas, nor
between the different concentrations of the bleaching solution.
Conclusion These results suggest that tooth bleaching with carbamide
(urea) peroxide (using commercially available concentrations) does not
increase the susceptibility of enamel to acid erosion or caries
Materials used in endodontics and tooth isolation
This document discusses materials used in endodontics, including irrigants, intracanal medicaments, and obturation materials. It provides details on common irrigants like sodium hypochlorite, chlorhexidine, EDTA, and MTAD, describing their functions, properties, mechanisms of action, advantages, and limitations. Intracanal medicaments discussed include calcium hydroxide, essential oils, formaldehyde, and phenolic compounds. Obturation materials covered are gutta percha, Resilon, MTA, and root canal sealers. Isolation is also mentioned as providing comfort to patients and protecting against foreign bodies or soft tissue injury during endodontic procedures.
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The effect of bleaching on enamel susceptibility to acid erosion and deminera...
Introduction The purpose of this in vitro study was to determine if
enamel that had been bleached by carbamide (urea) peroxide gel (CPG)
was at increased risk of either acid erosion or demineralisation (early
caries) than un-bleached enamel.
Methods Human incisors were employed. The samples were randomly
assigned to one of 4 groups; a) 10% CPG, b) 16% CPG, c) 22% CPG and d)
10% CPG with xylitol, fluoride and potassium. Each specimen was
moistened with saliva and the appropriate formulation placed for 2
hours for a total of 40 hours of exposure. In order to ensure that
bleaching had taken place, tooth shades were monitored using the
Shade-Eye device. Following the bleaching process, one half of the
specimen was subjected to an erosive challenge, the other to a
demineralisation system with one half of each sub-sample retained as a
non-bleached control. Samples were assessed longitudinally with
quantitative light-induced fluorescence (QLF) and at the conclusion of
the study with transverse micro-radiography (TMR)
Results Erosion was detected in all samples (ΔQ 126±23.4), in both
bleached and non-bleached areas. There was no statistical difference
between the bleached and non-bleached areas either within the
treatment groups or between them. Caries-like lesions were detected on
all samples; TMR revealed sub-surface lesions on all teeth and QLF data
supported this (ΔQ 89±18.9). Following statistical analysis there were no
differences detected between the bleached and non-bleached areas, nor
between the different concentrations of the bleaching solution.
Conclusion These results suggest that tooth bleaching with carbamide
(urea) peroxide (using commercially available concentrations) does not
increase the susceptibility of enamel to acid erosion or caries
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This document discusses materials used in endodontics, including irrigants, intracanal medicaments, and obturation materials. It provides details on common irrigants like sodium hypochlorite, chlorhexidine, EDTA, and MTAD, describing their functions, properties, mechanisms of action, advantages, and limitations. Intracanal medicaments discussed include calcium hydroxide, essential oils, formaldehyde, and phenolic compounds. Obturation materials covered are gutta percha, Resilon, MTA, and root canal sealers. Isolation is also mentioned as providing comfort to patients and protecting against foreign bodies or soft tissue injury during endodontic procedures.
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- Mineral trioxide aggregate (MTA) is the most commonly recommended material for sealing communications between the root canal system and surrounding tissues, developed by Dr. Mahmoud Torabinejad. It is composed mainly of Portland cement.
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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
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It gives an insight on the sealers interaction with various intracanal medicaments and irrigants.
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After the manufacturing of the drug, it is essential that these should be stored properly. The stability of drug during it’s storage depend on so many factor and proper packaging is one of them. The pharmaceutical products are in direct contact with the container and closures. So improper packaging and poor quality of container may lead to deterioration of the product.
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Orthodontic resin /certified fixed orthodontic courses by Indian dental academy
Orthodontic resin /certified fixed orthodontic courses by Indian dental academy Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.
Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
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0091-9248678078Dental caries 8/prosthodontic courses
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
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www.indiandentalacademy.com
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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
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Decalcification.pptx
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1. Silicone hydrogel contact lenses were developed to improve oxygen permeability over conventional hydrogel lenses. They contain both silicone components that increase oxygen permeability and hydrogel components that facilitate fluid transport and lens movement.
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- 1. IMMERSION OF FIBER GLASS IN 10% NAOH AND HCL OBJECTIVE To study the weight loss of fiber glass in NaOH and HCl solution Make a sol. of 10% NaOH and HCl The specimen was immersed in the solution Measure weight for 6days Calculate the weight loss RESULTS AND DISCUSSION Graphical representation of immersion of fiber glass shows that weight of fiber glass is decreased Procedure Weight is gradually decreased in acidic media as compared to basic media because in acidic media protons releases in solution, size of protons is very small and its diffusion rate is high so weight loss of fiber glass in acid media is higher than in basic media. PRECAUTIONS: 1- Keep the room and the work areas clean. 2- Use gloves while handling the chemicals. 3-Do not eat or drink anything while working in the lab. 4-Wash your hands thoroughly with soap before leaving the lab. THEORY Fiberglass is a composite material made of glass filament and a plastic resin. The glass filament is made of thin fibers of glass that are less than 25 micrometers in diameter. It is a common type of fiber reinforced plastic using glass fiber. 3.208 3.21 3.212 3.214 3.216 3.218 day 1 day 2 day 3 day 4 day 5 day 6 Fiber glass in HCl 3.108 3.11 3.112 3.114 3.116 day 1 day 2 day 3 day 4 day 5 day 6 Fiber glass in NaOH Time APPARATUS Electrical balance Glass beakers Vernier caliper Measuring cylinder Time