The document discusses the biocompatibility of dental materials. It defines biocompatibility as the ability of a material to elicit an appropriate biological response. Dental materials must not be harmful, toxic, carcinogenic, or allergenic. Biocompatibility is evaluated through primary, secondary, and usage tests involving cell cultures, animals, and human clinical trials. The summary discusses the various tests conducted on different dental materials like metals, ceramics, polymers, and how their composition and interactions in the oral cavity impact biocompatibility.
Biological properties of dental materials 1 /certified fixed orthodontic cour...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,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078
A biomaterial can be defined as any substance other than a drug that can be used for any period of time as part of a system that treats, augments, or replaces any tissue, organ or function of the body.
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
Biological properties of dental materials /certified fixed orthodontic cours...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,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078
Biocompatibility of dental materials / aesthetic dentistry coursesIndian dental academy
Indian Dental Academy: will be one of the most relevant and exciting
training center with best faculty and flexible training programs
for dental professionals who wish to advance in their dental
practice,Offers certified courses in Dental
implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic
Dentistry, Periodontics and General Dentistry.
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
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.
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
Report Back from SGO 2024: What’s the Latest in Cervical Cancer?bkling
Are you curious about what’s new in cervical cancer research or unsure what the findings mean? Join Dr. Emily Ko, a gynecologic oncologist at Penn Medicine, to learn about the latest updates from the Society of Gynecologic Oncology (SGO) 2024 Annual Meeting on Women’s Cancer. Dr. Ko will discuss what the research presented at the conference means for you and answer your questions about the new developments.
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.
Knee anatomy and clinical tests 2024.pdfvimalpl1234
This includes all relevant anatomy and clinical tests compiled from standard textbooks, Campbell,netter etc..It is comprehensive and best suited for orthopaedicians and orthopaedic residents.
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.
New Directions in Targeted Therapeutic Approaches for Older Adults With Mantl...i3 Health
i3 Health is pleased to make the speaker slides from this activity available for use as a non-accredited self-study or teaching resource.
This slide deck presented by Dr. Kami Maddocks, Professor-Clinical in the Division of Hematology and
Associate Division Director for Ambulatory Operations
The Ohio State University Comprehensive Cancer Center, will provide insight into new directions in targeted therapeutic approaches for older adults with mantle cell lymphoma.
STATEMENT OF NEED
Mantle cell lymphoma (MCL) is a rare, aggressive B-cell non-Hodgkin lymphoma (NHL) accounting for 5% to 7% of all lymphomas. Its prognosis ranges from indolent disease that does not require treatment for years to very aggressive disease, which is associated with poor survival (Silkenstedt et al, 2021). Typically, MCL is diagnosed at advanced stage and in older patients who cannot tolerate intensive therapy (NCCN, 2022). Although recent advances have slightly increased remission rates, recurrence and relapse remain very common, leading to a median overall survival between 3 and 6 years (LLS, 2021). Though there are several effective options, progress is still needed towards establishing an accepted frontline approach for MCL (Castellino et al, 2022). Treatment selection and management of MCL are complicated by the heterogeneity of prognosis, advanced age and comorbidities of patients, and lack of an established standard approach for treatment, making it vital that clinicians be familiar with the latest research and advances in this area. In this activity chaired by Michael Wang, MD, Professor in the Department of Lymphoma & Myeloma at MD Anderson Cancer Center, expert faculty will discuss prognostic factors informing treatment, the promising results of recent trials in new therapeutic approaches, and the implications of treatment resistance in therapeutic selection for MCL.
Target Audience
Hematology/oncology fellows, attending faculty, and other health care professionals involved in the treatment of patients with mantle cell lymphoma (MCL).
Learning Objectives
1.) Identify clinical and biological prognostic factors that can guide treatment decision making for older adults with MCL
2.) Evaluate emerging data on targeted therapeutic approaches for treatment-naive and relapsed/refractory MCL and their applicability to older adults
3.) Assess mechanisms of resistance to targeted therapies for MCL and their implications for treatment selection
Couples presenting to the infertility clinic- Do they really have infertility...Sujoy Dasgupta
Dr Sujoy Dasgupta presented the study on "Couples presenting to the infertility clinic- Do they really have infertility? – The unexplored stories of non-consummation" in the 13th Congress of the Asia Pacific Initiative on Reproduction (ASPIRE 2024) at Manila on 24 May, 2024.
Ethanol (CH3CH2OH), or beverage alcohol, is a two-carbon alcohol
that is rapidly distributed in the body and brain. Ethanol alters many
neurochemical systems and has rewarding and addictive properties. It
is the oldest recreational drug and likely contributes to more morbidity,
mortality, and public health costs than all illicit drugs combined. The
5th edition of the Diagnostic and Statistical Manual of Mental Disorders
(DSM-5) integrates alcohol abuse and alcohol dependence into a single
disorder called alcohol use disorder (AUD), with mild, moderate,
and severe subclassifications (American Psychiatric Association, 2013).
In the DSM-5, all types of substance abuse and dependence have been
combined into a single substance use disorder (SUD) on a continuum
from mild to severe. A diagnosis of AUD requires that at least two of
the 11 DSM-5 behaviors be present within a 12-month period (mild
AUD: 2–3 criteria; moderate AUD: 4–5 criteria; severe AUD: 6–11 criteria).
The four main behavioral effects of AUD are impaired control over
drinking, negative social consequences, risky use, and altered physiological
effects (tolerance, withdrawal). This chapter presents an overview
of the prevalence and harmful consequences of AUD in the U.S.,
the systemic nature of the disease, neurocircuitry and stages of AUD,
comorbidities, fetal alcohol spectrum disorders, genetic risk factors, and
pharmacotherapies for AUD.
Explore natural remedies for syphilis treatment in Singapore. Discover alternative therapies, herbal remedies, and lifestyle changes that may complement conventional treatments. Learn about holistic approaches to managing syphilis symptoms and supporting overall health.
3. BIOCOMPATIBILITY
• Biocompatibility is “the ability of a material to elicit
an appropriate biological response in a given
application in the body”.
• Capable of material to exist in harmony with the
surrounding biologic environment.
-Kenneth J. Anusavice
-GPT, 9TH Edition
4. REQUIREMENTS OF A BIOCOMPATIBLE
MATERIAL
Should not
harmful to pulp & soft tissues.
contain toxic diffusable substance.
have carcinogenic potential.
cause allergy.
Applied Dental Materials, 9th edition John F. McCabe & Angus W.G. Walls
5. Evaluation of Biocompatibility
Biocompatibility tests are classified on three
levels (tiers) :-
1. Group I : Primary tests
2. Group II : Secondary tests
3. Group III : Usage tests
Craig’s Restorative Dental Materials, 12th edition
Usage
Secondary
Primary
Number of materials
Progressoftesting
6. PRIMARY TESTS
• invitro in nature.
• Carried outside (test tubes, cell culture dish, flask).
• Placed in contact directly or by means of a barrier.
These are done to evaluate
• Invitro cytotoxicity.
• Mutagenecity.
• Systemic toxicity.
In vitro tests
Direct
tests
Indirect
tests
8. PRIMARY TESTS
• Direct Cell culture test
• Membrane integrity assay
• Barrier screening test
• Agar diffusion test
• Filter diffusion testing method
• Dentin barrier test
• Tooth slice culture assay
• Ame’s test
• Style’s test
9. DIRECT CELL CULTURE
• Mouse fibroblasts or human epithelial cells used.
• culture dishes placed until a mono-layer of cells are formed.
• The tested material is added to the culture and placed for 3
days.
Murray PE, et al. Med Oral Patol Oral Cir Bucal. 2007 May 1;12(3):E258-66
13. SECONDARY TESTS
Mostly conducted on animals(Mice, rats, hamsters, or
guinea pigs ).
• Inhalational Toxicity
• Skin Irritation
• Sensitization
• Maximization test
• Implantation Responses.
• Buehler’s test
Murray PE, et al. Med Oral Patol Oral Cir Bucal. 2007 May 1;12(3):E258-66
14. ANIMAL TESTS
Advantage :
• biological responses more comprehensive
• More relevant than in vitro tests
Disadvantages :
• Difficult to interpret and control
• Expensive
• Time consuming
• Ethical concerns .
18. USAGE TESTS
• Performed on animals and humans.
• To test both pulpal and bone response.
• On humans – clinical trial .
Various tests are
• Pulp-dentin test for restorative materials
• Pulp-capping and pulpotomy material test
• Mucosal damage and mucosa usage test
• Gingival usage test.
Murray PE, et al. Med Oral Patol Oral Cir Bucal. 2007 May 1;12(3):E258-66
19. • Pulp is merely exposed & partially removed for pulpotomy
assessment.
• Application of particular cement is done.
• Dentinal Bridge Formation is observed.
PULP CAPPING AND PULPOTOMY
USAGE TEST :
20. STANDARDS THAT REGULATE THE
MEASUREMENT OF BIOCOMPATIBILITY:
The first efforts of the ADA to establish guidelines for dental
a materials came in 1926 .
ANSI/ ADA specification 41: Three categories are
described in the 1982: initial, secondary and usage tests
ISO 10993
• International efforts were initiated by several
organisations to developed international standards for
biomedical materials and devices.
21. • Standard organisation (ISO) published the final
document in 1992.
• It contained 12 parts
• The ANSI/ ADA specification from council on scientific
affairs, American dental association .
22. US FDA
(FOOD AND DRUG ADMINISTRATION)
• ANSI results are send to FDA for approval.
• Product is approved by FDA if it passes the primary &
secondary tests.
• For dental material manufacturers a period of 7 years is
given to prove efficacy.
23. USFDA classified the materials into 3 group
based on relative risk factors.
• Class I Low risk
• Class II Required to meet FDA
performance standards
• Class III Most stringent category, needs
approval for safety & effectiveness before marketing.
25. Microleakage
Penetration of fluids along interface between
restoration & tooth
It can result in :-
1. Secondary/Recurrent caries pulpitis, pulp
abscess, etc.
2. Staining or discoloration
3. Sensitivity due to continuing Pulpal irritation
27. Thermal Changes
Temperature fluctuations may crack restorative material
Microleakage
Metals are good conductors of heat, causing sensitivity
with large metallic restorations
eg. Amalgam or gold inlays
28. Galvanism
Flow of current when two
dissimilar metallic
restorations
Due to different
electromotive potentials
Saliva acts as electrolyte
Contact Short-circuit
current flows through pulp
Pain & Discomfort
29. Estrogenicity
• chemical act similar to estrogen.
• Bisphenol A –on estrogenic receptors in cells.
• E-screen assay –growth response of breast cancer
cells that are estrogen sensitive .
31. LATEX
• Latex from rubber tree.
• Ammonia is added as preservative,
(vulcanization)allergy.
• Angioneurotic allergic reactions oedema, chest pain, and
a rash on the neck and chest of severely allergic persons
• Skin irritation test (epinephrine)
Koh D, Ng V, Leow YH, Goh CL. Br J Dermatol. 2005 Nov;153(5):954-9
32. CASTING ALLOYS
• Alloy is any mixture of 2 or more metals
• Element is released from an alloy to cause allergy
• (mucous irritation test)
John M.Powers ,Criag’s , Restorative dental materials, 11TH edition , Elsevier PG 98- 126
33. BERYLLIUM
• In Ni-Cr alloys to increase the castability of these
alloys.
• Chemical bonding of porcelain .
• Documented carcinogen in metallic or ionic state.
• Berylliosis (inhalation test).
34. NICKEL
• Most allergic
• Palladium
• F>M
• Rakesh G.makwana reported that Ni
is a allergen by patch testing .
35. Wataha JC, et al. Dent Clin North Am. 2004 Apr;48(2):vii-viii, 499-512
METAL IN ALLOYS EFFECT ON TISSUE
Beryllium Carcinogenic
Cadmium Carcinogenic
Chromium Carcinogenic
Cobalt Carcinogenic
Copper Mutagenic
Gallium not mutagenic in vitro
studies
Nickel Carcinogenic (NiS)
Palladium mutagenic Low risk
Tin Mutagenic
Zinc Not mutagenic
Iron Mutagenic
36. AMALGAM
• Determined largely by corrosion products released
• Unreacted mercury from amalgam is toxic
• Copper.
• into the gingival crevice causes inflammation of the
gingiva
Mahler DB. J Dent Res. 1997Jan;76(1):537-41.
37. Amalgam & Mercury
Mercury itself has no effect on pulp
Acute mercury poisoning :-
Chronic mercury poisoning :-
Weakness, anorexia, wt. loss, insomnia, irritability,
dizziness & tremors .
Methyl mercury poisoning :-
Paresthesia , ataxia ,Tunnel Vision
Biocompatibility of Dental Materials - Gottfried Schmalz, Dorthe
Metallic
Inorganic
Organic
38. AMALGAM (miracle mix)
• The cavities, depths of about 2 mm, were between
the CEJ and the root tip.
• The teeth reimplanted after restoration
• The animals were sacrificed at 6 months.
• Result suggests that resin composites and amalgam
release cytotoxic materials
40. ZINC PHOSPHATE
In Vitro screening test strong to moderate reactions.
• Usage test in deep cavity preparation moderate to severe
localized pulpal damage in 3 days.
• Toxic reactions were observed in a permanent growing cell
line
• The PH of the set cement is 2
John M.Powers, Criag’s, Restorative dental materials, 11TH edition , Elsevier PG 98- 126
41. ZINC POLYACRYLATE
In short tissue culture test, the release of zinc and
fluoride ions in reduced PH .
• After 3 days. Pulpal response of poly acrylate
cements is same as ZOE,
John M.Powers, Criag’s, Restorative dental materials, 11TH edition , Elsevier PG 98- 126
42. ZOE CEMENTS
In vitro test ,depresses cell respiration, and reduces nerve
transmission with direct contact.
• In usage tests ,slight to moderate inflammation within
the first week.
• Reduced to mild chronic inflammatory
• Reparative dentin formation( within 5 to 8 weeks),
John M.Powers, Criag’s, Restorative dental materials, 11TH edition , Elsevier PG 98- 126
43. RESIN MODIFIED GIC
HEMA diffuses through the dentin to pulp .
• Persistent inflammation and allergic reactions .
• HEMA can penetrate latex cause contact dermatitis.
• Resin modified < conventional GIC
• John w. Nicholson, the biocompatibility of resin modified glass ionomer cements fro dentistry, dental materials 2008, 24, 1720-1708
• M.Ghavamnasari, A histopathological study on pulp responses to glass ionomer cements in human teeth., Journal OF Dentistry, Tehram University Of
Medical science2005, VOL 2, NUMBER 4
44. Impression Materials
Irreversible hydrocolloids :- Inhaling fine airborne
particles (dust) can cause silicosis & pulmonary
hypersensitivity.
Dustless/Dustfree alginate is preferred
Elastomers :- Cellular toxicity levels
Polyether > Addition Silicone > Polysulphide
45. IMPRESSION MATERIALS
Kanarek described a clinical case of polysulphide
impression material . Severe inflammatory reactions
Chiaro coppi did a study on toxicity of impression
materials using human fibroblast
• polyether materials are cytotoxic
• among poly vinylsiloxanes, only Light Body induces clear
inhibition of cellular viability tests
46. POLYSULFIDE RUBBER
IMPRESSION MATERIAL
• ADA measured toxicity by injecting material into
the oral mucosa of baboons for 48 h
• light-bodied materials were less toxic and
contained less lead. Lead peroxide (PbO2) are used
in materials for radiographic detection.
J Dent Res 62(5):548-55 1, May 1983
Spranley TJ, et al. J Dent Res. 1983 May;62(5):548-51
47. CERAMICS
• systemic toxicity extremely low
• silicosis(fibrotic pneumoconiosis)
• inflammation after implantation in muscle
• uranium oxide cause radioactivity
48. DENTURE BASE MATERIAL
• Heat polymerizing, light curing, or Chemically
• Methyl esters of methacrylic acid are the
basicmodules of PMMA
• cytotoxic to epithelial cells in culture.
• Initiator dibenzoyl peroxide, and the cross-linking
agent EGDMA are the most common allergens
• water (37°C) before insertion to remove the major
share of leachable substances.
49. DENTURE ADHESIVES AND SOFT
TISSUE LINERS
• Cell culture tests : extremely cytotoxic(CMC)
• In animal tests : caused significant epithelial
changes
• In usage : Mild cytotoxity
F Chen et al- Cytotoxic effects of denture adhesives on primary human oral keratinocytes, fibroblasts and permanent
L929 cell line (Gerodontology 2012; doi: 10.1111/j.1741-2358.2012.00681.x)
50. SILICONE MAXILLOFACIAL
ELASTOMER
• Silicones are most widely used .
• Study done on baboons -implantation
Subperiosteal , Submucosal , Intramuscular .
• study indicated that inflammatory response and
not capsule thickness is the indicator .
Wolfaardt JF, Cleaton-Jones P, Lownie J, Ackermann G Biocompatibility testing of a silicone
maxillofacial prosthetic elastomer, J Prosthet Dent. 1992 Aug;68(2):331-8.
51. SUMMARY
• The biocompatibility of a dental material depend
on its composition ,location, and interaction with
the oral cavity .
• Materials that appear biocompatible when in
contact with the oral mucosal surface may cause
adverse reactions if they are implanted beneath it .
• Interactions between the material and the body
influence the biocompatibility of the material.
52. REFERENCE
• Craig RG, Restorative dental materials, 10th ed.
• Gottfried schmalz, Biocompatibility of dental materials, 3rd
ed,2009.
• Anusavice , Phillip’ Science of Dental Materilals,11th edition
Elsevier
• Applied Dental Materials, 9th edition John F. McCabe &
Angus W.G. Walls
• Peter E.Murray Et Al , How Is The Biocompatibility Of Dental
Materials Evaluated, Med Oral Patol Cir Bucal 2007;12,258-
66.
• Koh D, Ng V, Leow Y-H, Goh CL. A study of natural rubber
latex allergens in gloves used by healthcare workers . Br J
Dermatol 2005; 153: 954–9
• Wataha JC: Biocompatibility of dental casting alloys: a
review, J Prosthet Dent 83:223, 2000.
53. • D.B. Mahler; The High-copper Dental Amalgam
Alloys; J Dent Res 76 (1) 1997
• Fujibayashi S, Biomaterials [2004, 25(3):443-45
• John w. Nicholson, the biocompatibility of resin
modified glass ionomer cements fro dentistry, dental
materials 2008, 24, 1720-1708
• F Chen et al- Cytotoxic effects of denture adhesives
on primary human oral keratinocytes, fibroblasts and
permanent L929 cell line(Gerodontology 2012; doi:
10.1111/j.1741-2358.2012.00681.x).
• T.J. Spranley, Acute Tissue Irritation of Polysulfide
Rubber Impression Materials, J DENT RES 1983 62:
548.