Classification and impression techniques of implants/ dentistry dental implants
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Transcript of Classification and impression techniques of implants/ dentistry dental implants
Classification and impression techniques of implants
INDIAN DENTAL ACADEMY
Leader in continuing dental education
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Classification
Based uponPlacement within the tissues
Materials used
Attachment mechanism
Surface coating
Shape
Surgical stage
Mode of insertion
Tissue response & systemic toxicity effects of implants
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- Subperiosteal implants
Based upon the placement within the tissue
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Subdivision of subperiosteal implant
Unilateral
Interdental
Total
circumferential
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Unilateral subperiosteal implant
Interdental subperiosteal implant
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Total subperiosteal implant
Circumferential subperiosteal implant
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Transosteal implant
Also known as
Staple bone
Mandibular staple
Transmandibular
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Transosteal implant
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Endosteal implant
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Root form
Blade/plate form
Ramus frame
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Intramucosal inserts
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Endodontic stabilizer implant
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Based upon materials used
1.Metallic implants-commercially pure titanium
Titanium alloy
Cobalt chromium molybdenum
alloy
2.Nonmetallic implants-Ceramics
Carbon
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Ceramic and titanium alloy implants
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Based upon the attachment mechanism
1.Osseointegration
2.Fibro osseous integration
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Based upon their surface coating
Titanium plasma sprayed
Hydroxyapatite coating
Grid blasting with TiO
SLA(sandblasted-largegrid-acidetched)
Acid etched
Machined surface
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Based upon the shape
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Contd.
Threaded,nonthreaded
Tapered,parallel
With vent holes,without vent holes
Hollow cylinder,solid screws
Root form,blade form
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Based upon the surgical stage
Two stage implants
One stage implant
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Based upon mode of insertion
1.Axially inserted (crestal approach)
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2.Laterally inserted(basal approach)
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Based upon tissue response &systemic toxicity effects of implants
Biotolerant materials-polmethylmethacrylate
Bioinert materials-titanium and aluminium oxide
Bioactive materials-glass and calcium phosphate ceramic
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Components of implant
Implant body
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Cover screw
Healing abutment
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Healing cap
Implant abutment
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Impression posts
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Laboratory analogs
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IMPRESSION MATERIALS
Ideal Requirements
Complete plasticity before cureFluidity to record fine detailAbility to wet oral tissuesDimensional accuracyDimensional stabilityComplete elasticity after cureOptimal stiffnesswww.indiandentalacademy.com
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Materials Used
Alginate Agar Polysulphide Polyether Condensation Silicone Addition Siliconewww.indiandentalacademy.com
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ALGINATE
Poor dimensional stability Poor dimensional accuracy Poor tear strength Poor stiffness Interferes with setting of gypsumwww.indiandentalacademy.com
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AGAR
Interferes with setting of gypsum Dimensional instability Elaborate equipment needed Low tear resistancewww.indiandentalacademy.com
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Polysulphide
Base-polusulfide polymer, Catalyst- lead dioxide High tear strength Messy,unpleasant odour Long setting time Poor dimensional stability Hydrophobicwww.indiandentalacademy.com
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Condensation silicone
Cheaper Good tear strength, accuracy & elastic properties Dimensional instability,due to loss of ethyl alcohol Poured quicklywww.indiandentalacademy.com
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Addition silicone
Shorter setting time Easy to mix- automatic mixing devices Adequate tear strength Extremely high accuracy Dimensional stability even after 1 week Least distortion on removal Hydrophilic Good compatibility with gypsumwww.indiandentalacademy.com
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Polyether
Good dimensional stability & accuracy Short setting time Material very rigid Not available in all consistencies Most expensivewww.indiandentalacademy.com
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Dispensed as :
Manual mixing
Automixing system
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Manual mixing
Putty Heavy body Monophase Light bodywww.indiandentalacademy.com
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Automixing equipment & materials
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Two basic impression techniques for implants are
1. indirect technique or closed tray technique
2.direct or pick-up or open tray technique.
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Indirect impression technique
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Contd
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Direct impression technique
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Indirect method
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Direct method
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Related articles
Tautin(1985)presented a technique to accurately, transfer and reproduce the relationship between implant dentures , in which no preliminary impression or acrylic resin custom tray were needed. He used modeling compound to form a custom tray by adapting it over transfer copings,pressing the compound over the superior aspect of the coping so that its circular outline is seen through the compound.After trimming the outline