1) The document discusses the composition and classification of dental composite restorations. Composite restorations contain organic resins, fillers, coupling agents, coloring agents, UV absorbers, initiators, and inhibitors.
2) Composite restorations are classified based on filler particle size and content, including macrofilled, microfilled, hybrid, nanofill, and microhybrid composites. More recent types include flowable, packable, and giomer composites.
3) The properties of composite restorations are influenced by their composition, including coefficient of thermal expansion, water absorption, wear resistance, polymerization shrinkage, working and setting times, and curing characteristics. Fillers and higher filler content
direct filling gold... material aspect, types, condensation, cavity design, modifications. detaied seminar for post gradutes.... any doubts or suggestions contact dr.mb@hotmail.com
An inlay may cap none, or may cap all but one cusp.
Sturdevant’s 4th ed. page579
Inlays may be used as single-tooth restorations for proximo-occlusal or gingival lesions with minimal to moderate extensions
Shillingburg page 1
An inlay may be defined as a restoration which has been constructed out of mouth from gold, porcelain, or other material & then cemented into the prepared cavity of a tooth.
William McGehee pg410
direct filling gold... material aspect, types, condensation, cavity design, modifications. detaied seminar for post gradutes.... any doubts or suggestions contact dr.mb@hotmail.com
An inlay may cap none, or may cap all but one cusp.
Sturdevant’s 4th ed. page579
Inlays may be used as single-tooth restorations for proximo-occlusal or gingival lesions with minimal to moderate extensions
Shillingburg page 1
An inlay may be defined as a restoration which has been constructed out of mouth from gold, porcelain, or other material & then cemented into the prepared cavity of a tooth.
William McGehee pg410
A powerpoint presentation focusing mainly on the material aspects of composite resins. The second part of this presentation deals with the clinical aspects
This presentation tells everything about composite resin from history to composition to usage protocols. A must read for all dental students before practicals and exams.
this presentation includes details about composite resins which are tooth colored filling materials used in dentistry. it also includes various recent advances in this field.
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Title: Sense of Smell
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the primary categories of smells and the concept of odor blindness.
Explain the structure and location of the olfactory membrane and mucosa, including the types and roles of cells involved in olfaction.
Describe the pathway and mechanisms of olfactory signal transmission from the olfactory receptors to the brain.
Illustrate the biochemical cascade triggered by odorant binding to olfactory receptors, including the role of G-proteins and second messengers in generating an action potential.
Identify different types of olfactory disorders such as anosmia, hyposmia, hyperosmia, and dysosmia, including their potential causes.
Key Topics:
Olfactory Genes:
3% of the human genome accounts for olfactory genes.
400 genes for odorant receptors.
Olfactory Membrane:
Located in the superior part of the nasal cavity.
Medially: Folds downward along the superior septum.
Laterally: Folds over the superior turbinate and upper surface of the middle turbinate.
Total surface area: 5-10 square centimeters.
Olfactory Mucosa:
Olfactory Cells: Bipolar nerve cells derived from the CNS (100 million), with 4-25 olfactory cilia per cell.
Sustentacular Cells: Produce mucus and maintain ionic and molecular environment.
Basal Cells: Replace worn-out olfactory cells with an average lifespan of 1-2 months.
Bowman’s Gland: Secretes mucus.
Stimulation of Olfactory Cells:
Odorant dissolves in mucus and attaches to receptors on olfactory cilia.
Involves a cascade effect through G-proteins and second messengers, leading to depolarization and action potential generation in the olfactory nerve.
Quality of a Good Odorant:
Small (3-20 Carbon atoms), volatile, water-soluble, and lipid-soluble.
Facilitated by odorant-binding proteins in mucus.
Membrane Potential and Action Potential:
Resting membrane potential: -55mV.
Action potential frequency in the olfactory nerve increases with odorant strength.
Adaptation Towards the Sense of Smell:
Rapid adaptation within the first second, with further slow adaptation.
Psychological adaptation greater than receptor adaptation, involving feedback inhibition from the central nervous system.
Primary Sensations of Smell:
Camphoraceous, Musky, Floral, Pepperminty, Ethereal, Pungent, Putrid.
Odor Detection Threshold:
Examples: Hydrogen sulfide (0.0005 ppm), Methyl-mercaptan (0.002 ppm).
Some toxic substances are odorless at lethal concentrations.
Characteristics of Smell:
Odor blindness for single substances due to lack of appropriate receptor protein.
Behavioral and emotional influences of smell.
Transmission of Olfactory Signals:
From olfactory cells to glomeruli in the olfactory bulb, involving lateral inhibition.
Primitive, less old, and new olfactory systems with different path
Flu Vaccine Alert in Bangalore Karnatakaaddon Scans
As flu season approaches, health officials in Bangalore, Karnataka, are urging residents to get their flu vaccinations. The seasonal flu, while common, can lead to severe health complications, particularly for vulnerable populations such as young children, the elderly, and those with underlying health conditions.
Dr. Vidisha Kumari, a leading epidemiologist in Bangalore, emphasizes the importance of getting vaccinated. "The flu vaccine is our best defense against the influenza virus. It not only protects individuals but also helps prevent the spread of the virus in our communities," he says.
This year, the flu season is expected to coincide with a potential increase in other respiratory illnesses. The Karnataka Health Department has launched an awareness campaign highlighting the significance of flu vaccinations. They have set up multiple vaccination centers across Bangalore, making it convenient for residents to receive their shots.
To encourage widespread vaccination, the government is also collaborating with local schools, workplaces, and community centers to facilitate vaccination drives. Special attention is being given to ensuring that the vaccine is accessible to all, including marginalized communities who may have limited access to healthcare.
Residents are reminded that the flu vaccine is safe and effective. Common side effects are mild and may include soreness at the injection site, mild fever, or muscle aches. These side effects are generally short-lived and far less severe than the flu itself.
Healthcare providers are also stressing the importance of continuing COVID-19 precautions. Wearing masks, practicing good hand hygiene, and maintaining social distancing are still crucial, especially in crowded places.
Protect yourself and your loved ones by getting vaccinated. Together, we can help keep Bangalore healthy and safe this flu season. For more information on vaccination centers and schedules, residents can visit the Karnataka Health Department’s official website or follow their social media pages.
Stay informed, stay safe, and get your flu shot today!
Recomendações da OMS sobre cuidados maternos e neonatais para uma experiência pós-natal positiva.
Em consonância com os ODS – Objetivos do Desenvolvimento Sustentável e a Estratégia Global para a Saúde das Mulheres, Crianças e Adolescentes, e aplicando uma abordagem baseada nos direitos humanos, os esforços de cuidados pós-natais devem expandir-se para além da cobertura e da simples sobrevivência, de modo a incluir cuidados de qualidade.
Estas diretrizes visam melhorar a qualidade dos cuidados pós-natais essenciais e de rotina prestados às mulheres e aos recém-nascidos, com o objetivo final de melhorar a saúde e o bem-estar materno e neonatal.
Uma “experiência pós-natal positiva” é um resultado importante para todas as mulheres que dão à luz e para os seus recém-nascidos, estabelecendo as bases para a melhoria da saúde e do bem-estar a curto e longo prazo. Uma experiência pós-natal positiva é definida como aquela em que as mulheres, pessoas que gestam, os recém-nascidos, os casais, os pais, os cuidadores e as famílias recebem informação consistente, garantia e apoio de profissionais de saúde motivados; e onde um sistema de saúde flexível e com recursos reconheça as necessidades das mulheres e dos bebês e respeite o seu contexto cultural.
Estas diretrizes consolidadas apresentam algumas recomendações novas e já bem fundamentadas sobre cuidados pós-natais de rotina para mulheres e neonatos que recebem cuidados no pós-parto em unidades de saúde ou na comunidade, independentemente dos recursos disponíveis.
É fornecido um conjunto abrangente de recomendações para cuidados durante o período puerperal, com ênfase nos cuidados essenciais que todas as mulheres e recém-nascidos devem receber, e com a devida atenção à qualidade dos cuidados; isto é, a entrega e a experiência do cuidado recebido. Estas diretrizes atualizam e ampliam as recomendações da OMS de 2014 sobre cuidados pós-natais da mãe e do recém-nascido e complementam as atuais diretrizes da OMS sobre a gestão de complicações pós-natais.
O estabelecimento da amamentação e o manejo das principais intercorrências é contemplada.
Recomendamos muito.
Vamos discutir essas recomendações no nosso curso de pós-graduação em Aleitamento no Instituto Ciclos.
Esta publicação só está disponível em inglês até o momento.
Prof. Marcus Renato de Carvalho
www.agostodourado.com
NVBDCP.pptx Nation vector borne disease control programSapna Thakur
NVBDCP was launched in 2003-2004 . Vector-Borne Disease: Disease that results from an infection transmitted to humans and other animals by blood-feeding arthropods, such as mosquitoes, ticks, and fleas. Examples of vector-borne diseases include Dengue fever, West Nile Virus, Lyme disease, and malaria.
micro teaching on communication m.sc nursing.pdfAnurag Sharma
Microteaching is a unique model of practice teaching. It is a viable instrument for the. desired change in the teaching behavior or the behavior potential which, in specified types of real. classroom situations, tends to facilitate the achievement of specified types of objectives.
Ozempic: Preoperative Management of Patients on GLP-1 Receptor Agonists Saeid Safari
Preoperative Management of Patients on GLP-1 Receptor Agonists like Ozempic and Semiglutide
ASA GUIDELINE
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ARTIFICIAL INTELLIGENCE IN HEALTHCARE.pdfAnujkumaranit
Artificial intelligence (AI) refers to the simulation of human intelligence processes by machines, especially computer systems. It encompasses tasks such as learning, reasoning, problem-solving, perception, and language understanding. AI technologies are revolutionizing various fields, from healthcare to finance, by enabling machines to perform tasks that typically require human intelligence.
Lung Cancer: Artificial Intelligence, Synergetics, Complex System Analysis, S...Oleg Kshivets
RESULTS: Overall life span (LS) was 2252.1±1742.5 days and cumulative 5-year survival (5YS) reached 73.2%, 10 years – 64.8%, 20 years – 42.5%. 513 LCP lived more than 5 years (LS=3124.6±1525.6 days), 148 LCP – more than 10 years (LS=5054.4±1504.1 days).199 LCP died because of LC (LS=562.7±374.5 days). 5YS of LCP after bi/lobectomies was significantly superior in comparison with LCP after pneumonectomies (78.1% vs.63.7%, P=0.00001 by log-rank test). AT significantly improved 5YS (66.3% vs. 34.8%) (P=0.00000 by log-rank test) only for LCP with N1-2. Cox modeling displayed that 5YS of LCP significantly depended on: phase transition (PT) early-invasive LC in terms of synergetics, PT N0—N12, cell ratio factors (ratio between cancer cells- CC and blood cells subpopulations), G1-3, histology, glucose, AT, blood cell circuit, prothrombin index, heparin tolerance, recalcification time (P=0.000-0.038). Neural networks, genetic algorithm selection and bootstrap simulation revealed relationships between 5YS and PT early-invasive LC (rank=1), PT N0—N12 (rank=2), thrombocytes/CC (3), erythrocytes/CC (4), eosinophils/CC (5), healthy cells/CC (6), lymphocytes/CC (7), segmented neutrophils/CC (8), stick neutrophils/CC (9), monocytes/CC (10); leucocytes/CC (11). Correct prediction of 5YS was 100% by neural networks computing (area under ROC curve=1.0; error=0.0).
CONCLUSIONS: 5YS of LCP after radical procedures significantly depended on: 1) PT early-invasive cancer; 2) PT N0--N12; 3) cell ratio factors; 4) blood cell circuit; 5) biochemical factors; 6) hemostasis system; 7) AT; 8) LC characteristics; 9) LC cell dynamics; 10) surgery type: lobectomy/pneumonectomy; 11) anthropometric data. Optimal diagnosis and treatment strategies for LC are: 1) screening and early detection of LC; 2) availability of experienced thoracic surgeons because of complexity of radical procedures; 3) aggressive en block surgery and adequate lymph node dissection for completeness; 4) precise prediction; 5) adjuvant chemoimmunoradiotherapy for LCP with unfavorable prognosis.
- Video recording of this lecture in English language: https://youtu.be/lK81BzxMqdo
- Video recording of this lecture in Arabic language: https://youtu.be/Ve4P0COk9OI
- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
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These lecture slides, by Dr Sidra Arshad, offer a quick overview of physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar leads (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
Prix Galien International 2024 Forum ProgramLevi Shapiro
June 20, 2024, Prix Galien International and Jerusalem Ethics Forum in ROME. Detailed agenda including panels:
- ADVANCES IN CARDIOLOGY: A NEW PARADIGM IS COMING
- WOMEN’S HEALTH: FERTILITY PRESERVATION
- WHAT’S NEW IN THE TREATMENT OF INFECTIOUS,
ONCOLOGICAL AND INFLAMMATORY SKIN DISEASES?
- ARTIFICIAL INTELLIGENCE AND ETHICS
- GENE THERAPY
- BEYOND BORDERS: GLOBAL INITIATIVES FOR DEMOCRATIZING LIFE SCIENCE TECHNOLOGIES AND PROMOTING ACCESS TO HEALTHCARE
- ETHICAL CHALLENGES IN LIFE SCIENCES
- Prix Galien International Awards Ceremony
4. • In composite resin, the addition of filler
• Reduces the coefficient of thermal expansion
Reduces polymerizaton shrinkage
Increases abrasion resistance
Decreases water sorption
Increases tensile and compressive strengths
Increases fracture toughness
Increases flexure modulus
Provides radiopacity
Improves handling properties
Increases translucency
4
5. Coupling Agents
• Interfacial bonding between the matrix phase
and the filler phase is provided by coating the
filler particles with silane coupling agents
• a coupling agent is used to bond the filler to
the organic resin
5
6. • Functions of coupling agents
Bonding of filler and resin matrix
Transfer forces from flexible resin matrix to stiffer filler particles
Prevent penetration of water along filler resin interface, thus
provide hydrolytic stability
Examples: Organic silane.
r–methacryloxypropyltrimethoxysilane
10–methacryloxydecyltrimethoxysilane.
6
7. Coloring Agents
• Coloring agents are used in very small
percentage to produce different shades of
composites.
• Mostly metal oxides such as titanium oxide
and aluminum oxides are added to improve
the opacity of composite resins.
7
8. Ultraviolet Absorbers
• They are added to prevent discoloration, in
other words they act like a “sunscreen” to
composites.
• Commonly used UV absorber is
benzophenone.
8
9. Initiator Agents
• These agents activate the polymerization of
composites.
• Most common photoinitiator used is
camphoroquinone.
• Currently most recent composites are polymerized by
exposure to visible light in the range of 410 to 500 nm.
• Initiator varies with type of composites whether it is
light cured or chemically cured.
9
10. Inhibitors
• These agents inhibit the free radical generated
by spontaneous polymerization of the
monomers.
• For example, Butylated hydroxyl toluene
(0.01%).
10
11. CLASSIFICATION OF COMPOSITES
• According to Skinner:
– Traditional or conventional composite—8-12 µm
– Small particle filled composites—1-5 µm
– Microfilled composites—0.4-0.9 µm
– Hybrid composites—0.6-1 µm
11
12. • Philips and Lutz classification according to filler
particle size:
– Macrofiller composites (particles from 0.1-100 µ)
– Microfiller composites (0.04 µ particles)
– Hybrid composites (fillers of different sizes).
12
13. • Classification according to Bayne and
Heyman
Category Particle size
– Megafill 1-2 mm
– Macrofill 10-100 µm
– Midifill 1-10 µm
– Minifill 0.1-1 µm
– Microfill 0.01-0.1 µm
– Nanofill 0.005-0.01 µm
13
16. TYPES OF COMPOSITE RESINS
• Composite resin can be divided into three
types based on the size, amount and
composition of the inorganic filler
1. Macrofilled composite resins
2. Microfilled resins
3. Hybrid composite resins.
16
17. Macrofilled Composite Resins
• Average particle size of macrofill composite resins is from 5 to
25 micron.
• Filler content is approximately 75 to 80 percent by weight.
17
18. Microfilled Composites Resins
• Average particle size of microfilled resins ranges from 0.04 to
0.1 micrometer.
• Filler content of microfilled resins is 35 to 50 percent by
weight
18
19. Hybrid Composite Resins
• Hybrid composites are composed of glasses of
different compositions and sizes, with particle size
diameter of less than 2 µm and containing 0.04 µm
sized fumed silica.
• Filler content in these composites is 75 to 80 percent
by volume
19
21. Nanofill and nanohybrid composites
• Nanofill and nanohybrid composites have average particle size
less than that of microfilled composites.
• The introduction of these extremely small fillers and their
proper arrangement within the matrix results in physical
properties equivalent to the original hybrid composite resins.
21
23. Microhybrid composites
• Microhybrid composites have evolved from traditional hybrid composites.
• Filler content in microhybrids are 56 to 66 percent by volume.
• The average particle size in these composites range from 0.4 to 0.8 µm.
• Incorporation of smaller particles make them better to polish and handle
than their hybrid counterparts. Because of presence of large filler content,
microhybrid composites have improved physical properties and wear
resistance than microfilled composites.
23
26. Flowable Composite Resin
• Filler content in flowable resins is 60 percent by weight
• particle size ranging from 0.02 to 0.05 µm
• incorporation of lower filler content results in poor
mechanical properties of these composites than conventional
composites.
26
28. Indications
• Preventive resin restorations
• Small pit and fissure sealants
• Small, angular Class V lesions
• For repairing ditched amalgam margins
• Repair of small porcelain fractures
• Inner layer for Class II posterior composite resin placement for sealing the
gingival margin
• Resurfacing of worn composite or glass ionomer
cement restorations
• For repair of enamel defects
• For repair of crown margins
• Repair of composite resin margins
• For luting porcelain and composite resin veneers
• Class I restorations
• Small Class III restorations
• As base or liner
• Tunnel restorations.
28
29. Condensable (Packable) Composites
• to improve the compressive, tensile and edge strength
and handling of the composite.
• Filler content in packable composites ranges from 48 to
65 percent by volume.
• Average particle size ranges from 0.7 to 20 µm.
• Packable composites posses improved mechanical
properties because of presence of ceramic fibers
(alumina and silicon dioxide)
29
30. Indications
• Indicated for stress-bearing areas
• In class II restorations as they allow easier
establishment of physiological contact points.
30
32. Giomers
• Giomer is hybrid of words “glass ionomers” and “composite”.
These are relatively new type of restorative materials. they
are also known as PRG composites
(Prereacted glass ionomer composites).
• Giomers have properties of both glass ionomers (Fluoride
release, fluoride recharge) and resin composite (excellent
esthetics, easy polishability, biocompatibility)
32
37. PROPERTIES OF COMPOSITE
RESTORATIVE MATERIALS
• Coefficient of Thermal Expansion
• Coefficient of thermal expansion of composites is
approximately three times higher than normal tooth
structure
• result in loosening of the restoration
• This can be reduced by adding more filler content
37
38. Water Absorption
• Composites have tendency to absorb water which
can lead to the swelling of resin matrix, filler
debonding and thus restoration failure.
• Composites with higher filler content exhibit lower
water absorption and therefore better properties,
than composites with lower filler content.
38
39. Wear Resistance
• Composites are prone to wear under masticatory
forces or use of tooth-brushing and abrasive food.
• Wear resistance is a property of filler particles
depending on their size and quantity.
• The site of restorations in dental arch and occlusal
contact relationship, size, shape and content of
filler particles affect the wear resistance of the
composites.
39
40. Polymerization Shrinkage
• Composite materials shrink while curing which
can result in formation of a gap between resin
based composite and the preparation wall.
• It accounts for 1.67 to 5.68 percent of the
total volume.
40
43. Working and Setting Times
Light Cure Composites
• In case of light cure composites, application of
light source to the composite material starts
the polymerization.Usually, 70 percent of
polymerization takes place during the first 10
minutes, though the polymerization reaction
continues for period of 24 hours.
43
44. Mixing for Self-cure Composites
• Self-cure composites comes in two syringes.
• One syringe contains the peroxide initiator or catalyst
• other syringe contains the amine accelerator.
• they are dispensed in equal amounts and then thoroughly mixedfor
20 to 30 seconds.
• For mixing, plastic or wooden spatulas are preferred.
• Use of metal spatula is avoided because inorganic filler particles are
abrasive, they can abrade small amount of metal and thus discolor
the composite.
• the working time for self-cure composite resins is 1 to 1½
minutes.
• Once the mix starts hardening, it should not be disturbed for 4 to 5
minutes (setting time).
44
45. Curing Time
• Curing time depends on different factors like
shade of the composite,
intensity of the light used,
temperature,
Depth of the preparation,
thickness of the resin,
curing through tooth structure, composite filling.
45
46. Shade of Composite
• darker composite shades polymerize
slower when compared to lighter shades.
46
47. Distance and Angle between Light
Source and Resin
• the recommended distance between light source and
resin is 1 mm.
• Intensity of light decreases as the distance is increased.
• If the cavity is deep, then use high power density
lamp (about 600 mW/cm2) so that deeper layer is also
cured
• The angle of source should be at 90° to the resin. If angle
diverges from 90°, intensity of light decreases
47
48. Temperature
• Composite curing would be less if it is taken
out immediately from refrigerator.
• Composite should be atleast kept at room
temperature 1 hour before use
48
49. Resin Thickness
• Resin thickness is also one of the main factors
for its curing.
• It should be ideally 0.5 to 1.0 mm for optimum
polymerization of resin.
49
50. Intensity of Curing Light
• Intensity of curing light usually decreases as
the lamp ages.
• Decrease in intensity of light affect the
properties of composites significantly
50