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ANIMAL BIOCOMPATABILITY TEST
Dr. Vigneshwar T I M.D.S
BIOCOMPATIBILITY
The ability of a material to elicit an appropriate biological response in a given application in the body
………Craig
BIOCOMPATIBILITY
HISTORY
A. Late 1800s - first time - patients mouth
B. GV black
C. 1960s - Current philosophy about testing biological properties
BIOCOMPATIBILITY
HISTORY NAZI HUMAN EXPERIMENTATION
SERIES OF MEDCAL EXPERIMENT
JEWS AND ACROSS EUROPE
PRISINORS
BIOCOMPATIBILITY
STANDARDS THAT REGULATES ……..
A. 1926 - First ADA establishment of guideline for Dental Material - the National Bereau of Standard
B. 1933 - Dixon and Rickert - uniform test for all material
C. 1958 - Massler - test on tooth pulp
D. 1959 - Mitchell - test on connective tissue
F. 1972 - ADA Council on DM, instruments and Equipments approved Specification no 41 for Recommended Standard Practice for Biological evaluation of DM
HISTORY
BIOCOMPATIBILITY
HISTORY ISO 10993
ISO 7405 : 1997 Pre clinical evaluation of Biocompatibility of medical devices used in dentistry
ISO 10993-2 Animal welfare requirements
BIOCOMPATIBILITY
HISTORY ISO 10993
ISO 7405 : 1997 Pre clinical evaluation of Biocompatibility of medical devices used in dentistry
ANSI/ADA SPECIFICATION
41-1979
Revised to conform to the ISO standards Reaffirmed - 2001
ISO 10993-2 Animal welfare requirements
BIOCOMPATIBILITY
No of Test
Progress of testing
HISTORY
BIOCOMPATIBILITY
No of Test
Progress of testing
Usage
Secondary
Primary
ANSI/ADA SPECIFICATION 41HISTORY
BIOCOMPATIBILITY
Single material may not be biologically acceptable in all situations.
Biocompatibility is Dependant on Biological Responce
Physical Function
BIOCOMPATIBILITY
change in
biological response occurs
when change occurs in
Material itself
Application of Material
Host
BIOCOMPATIBILITY
DEFINING THE
USE OF MATERIAL
•
BIOCOMPATIBILITY
Consideration for Development of Dental Material :
Strength
Aesthetics
Aspects of Material
Biocompatibility
BIOCOMPATIBILITY
BIOCOMPATIBILITY
IN VITRO TEST
BIOCOMPATIBILITY
IN VITRO TEST
ANIMAL TEST
BIOCOMPATIBILITY
IN VITRO TEST
ANIMAL TEST
USAGE TEST
ANIMAL BIOCOMPATIBILITY TEST
WHY ANIMALS ?????
To determine the safety of the medical producthow much of a drug or biologic is absorbed into the bloodhow a medical product is broken down chemically in the bodythe toxicity of the product and its breakdown components (metabolites)how quickly the product and its metabolites are excreted from the body
.
ANIMAL BIOCOMPATIBILITY TEST
ADVANTAGE A. More Comprehensive B. More Relavant
DISADVANTAGE A. Difficult to interpret/control B. Expensive C. Time Consuming D. Ethical Concern E. Paperwork
contact and test site are examined
- control+ control
Test Materialcontact
few weeks
MUCOUS MEMBRANE IRRITATION TEST
WHAT DOES IT CHECK ?
Test material
SKIN SENSITISATION TEST
Test material
Why this test
SKIN SENSITISATION TEST
Freund’s Adjuvent Adhesive patches
SKIN SENSITISATION TEST
Initial injection
hypersensitivity
Patch -> Inflammatory responce
Result Variation
Bases for estimating the allergenicity ?
A. Degree of reaction
B. % of animals thats shows reaction
SKIN SENSITISATION TEST
DECISION POINT APPROACH
Mutagenic/Cariogenic property
Specific order When to stop?
FACTORS AFFECTING
TISSUES
SPECIES
GENDER
OTHER FACTORS
DECISION POINT APPROACH
TYPESLIMITED TIME IN-VIVO
LONG TERM/LIFETIME TEST
subcutaneous tissue
Evaluate the material
IMPLANTATION TEST
Evaluate the material
USE OF MATERIAL
MUSCLE
BONE
CT
IMPLANTATION TEST
Evaluate the material
A. Connective tissue B. Bone C. Muscle D. Use of Material
IMPLANTATION TEST
Evaluate the material
A. Connective tissue B. Bone C. Muscle D. Use of Material
IMPLANTATION TEST
Evaluate the material
A. Connective tissue B. Bone C. Muscle D. Use of Material
IMPLANTATION TEST
Evaluate the material
A. Use of Material Bone Muscle Connective tissue
MATERIALS THAT CONTACT SOFT TISSUE DIRECTLY
A.ENDODONTIC B.IMPLANTATION C.PERIODONTAL TREATMENT
IMPLANTATION TEST
TYPESSHORT TERM IMPLANTATION
LONG TERM IMPLANTATION
IMPLANTATION TEST
Mice
Pigs
Dogs
Sheeps
Goats
Rats
Guinea Pigs
Rabbits
SHORT TERM IMPLANTATION
COMPOUND
test material
control
placed at separate site
remain for 1 - 11 weeks
polyethylene
SHORT TERM IMPLANTATION
allow inflammatory reaction to subside
Reopen implant
site
Placement of test
material
Area is excised
appropriate
time
Microscopic examination /Interpretation
Evaluation of Tissue
Response
Histological
Histochemical
Immunohistochemical
LONG TERM IMPLANTATION
COMPOUND
test material
control
placed at separate site
remain for 1 - 2 YEARS
CONCLUSION
REFERRENCE
1. Craig’s - Restorative Dental materials - Twelfth Edition 2. Williams DF. Biocompatibility: an overview. In: Williams
DF, ed. Concise Encyclopaedia of Medical and Dental Materials. Oxford: Pergamon, 1990, pp 51-59.
3. IS0 DIS 7405. Preclinical Evaluation of Biocompatibility of Medical Devices Used in Dentistry, 1994.
4. Schmalz G. Characterisation of a simple dentin barrier test.J Dent Res 1992; 72: 599.
5. Bergenholtz G, Ahlstedt S and Lindhe J. Experimental pulpitis in immunised monkeys. Stand J Dent Res 1977; 85: 396-406.