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18 Cards in this Set
- Front
- Back
-medical Device that is Surgically placed directly into alveolar Bone
- SCT -Main Components -Parts -portion that is Visible Above Gingival level SCT w retains or supports -Part is submerged in alveolar bone...SCT |
-Dental Implant
- abutment -Fixture
1)Crown 2)Screw 3)Abutment 4)Fixture
-Abutment... Prosthesis
-Root of Implant |
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-2 Possible Scenarios when Implant placed into alveolar Bone -Which Scenarios is Unfavorable -Most Favorable outcome of dental Implant |
-1st : Formation of CT between Implant w Bone (Fibrous encapsulation) -2nd : May cause Implant to be loosened and dislodged w Leading to Implant Failure 2nd
-Osseointegration |
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- Direct structural and functional connection between Bone w Implant Surface
- SCT - distance -Ex for Metal with Bone -is there intervening |
-Osseointegration
-between 10-20 nm
-Ti
-No |
|
Occ of continuity between Implant w Bone -SCT -is there intervening space - Ex |
-Bio integration
-No
-Ceramic Implant materials (Bioactive) |
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Essay
Keys to successful Implant Osseointegration (6) |
- Bio compatibility نذاكر بايو الاول - Non contaminated Surface مش عايزين وساخة -Implant Surface Treatment عايزين علاج -Use of atraumatic insertion tech (Low heat generation) الجديد في جديد من غير حرقان -Close approximation of Implant Surface to Bone قرب قرب - Delayed Implant Loading براحة براحة |
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-GR Implant Surface Treatment - Other name of Delayed Implant Loading w GR |
- To Enhance Biological tissue response (BTR جدعنة مني)
-Prosthesis placement... To give sufficient time for Osseointegration to occ |
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Essay
Possible Causes of Implant Failure (7) |
- Early Osseointegration كل تأخيرة و فيها خيرة - Bacterial infection مرض معدي -Surgical trauma فين الجديد ياسطا -Micromovement occ بتتحرك ليه زي الحرامية - improper surgical placement مكان مش مكانه - Metal Fatigue انا فرهدت - Inadequate quality w quantity of Bone قيمة مقابل تمن |
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GR insufficient Early Osseointegration |
Due to premature overloading |
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Ideal Req
1) Bulk Prop : A. E : - E Compared to bone Must be selected GR B. Tensile w Compressive w shear strength : - Should have high GR C. YS w Fatigue Strength : -should have high GR D. Ductility - Acc to ADA, Minimum ductility of ?? % is req for dental Implant -GR in Implant is necessary E. Hardness w Toughness -High hardness eff on Implant wear -High Toughness Action 2) Surface Prop : a. S.E - Must be high or low -MCQ determines wettability by -Which cells shows ⬆️ Adhesion on Clean Implant Surface -also aff b. Surface Roughness -Roughness eff on SA 3)Biocompatibility : - Depends on |
1) A. -To give more proper stress distribution and to dec relative movement at interface نقلل الحركة عشان التوتر B. -To prevent fractures and improve functional stability C. -To prevent fracture under cyclic Loading D. - 8%
- for contouring and shaping of Implant
E. - ⬇️ wear of Implant
-prevents fracture of Implant
2) a. - High
-Wetting fluid (blood)
-Osteoblasts
-Adsorption of Ptn
b. - ⬆️
3) -Corrosion Resistance and cytotoxicity of Corrosion products |
|
GR Implant Bio material should be Corrosion Resistant |
Bec Corrosion can result in : - Surface roughening -Weakening of Restoration احنا ضعاف -Release of elements from Metal Or Alloy نطرد الناس -Toxic reactions نسمهم |
|
-Dental Implant Materials w Ex |
-Metal w Alloys... Ti -Ceramics... Zirconia -Polymers w Composities... PEEK
|
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Ti
- E -strength -Inert or tolerant or compatibile - magentic or non - Corrosion Resistance Yes or No - wear and abrasion resistance high or low - in abscence of interfacial motion or adverse environmental conditions, what action of this passivated (Oxi) Surface condition -when scratched or abraded so - High or low mp - posseses?? Structure (when) - Pure Ti (CpTi) class into how many grades w differ in w which grade has Most this differ - GR : Mech diff that exist between diff grades of CpTi is 1ry |
-Acceptable
-⬆️
-inert
-non
-Yes
-low
-⬇️ biocorrosion phenomena
-re passivate in vivo
- High
- Hexagonal closely packed HCP a (up to 882.5 C) -Body centered cubic BCC B (Above 882.5 C)
-4 grades... O2 Content... Grade 4
-Bec of Contaminants that present in minute quantities الاكل اللي بيجيب النمل |
|
Ti Alloys
-Forms of it w which is commonly used for Fabrication of dental Implants w MCQ F45555 its Symbol is w heat treatment for it eff on Strength - Theses phases originate when Pure Ti mixed with -Alpha phase stabilizer element is w eff on Strength w density - Beta phase stabilizer element -have low or High density w Strong or Weak w Highly or Low resistant to fatigue and Corrosion -Which is more stiffer :Ti Alloy or Bone - Low or High E is desirable w GR - GR Vanadium Free a+b alloys have developed as Implant -E of B higher or A+B Green Box - MCQ Ti Implants are considered w may cause -MCQ GR considered ethetic concerns |
- a w B w a-b... a-b combination alloy.. Ti-6Al-4V... ⬆️
-Al w Vanadium
-Al... ⬆️.. ⬇️
-Vanadium
-low.. Strong... Highly
-Ti Alloy
-Low.. As it gives more Favorable stress distribution at interface
-Bec of Toxicity concerns with Vanadium
-A+B
-Au standard... Metal HSN w Stress shielding effect
-Due to Gray color of Ti |
|
Zirconia -Alternative Implant material to - can be Manufactured by w which is additive w which is subtractive مطروح -class w consists of or similar to - Adv - Dis - Green Box MCQ GR Limitations include Lack of long Term studies w doubts of long Term stability |
-Ti w Ti Alloys
-3D printing (additive) -Milling (subtractive)
افتكر الكونترا -one piece (consists of Implant w abutment) -two piece (similar to Traditional)
- Excellent Osseointegration -Biocompatibility -Superior Strength w Fracture Resistance
-Very high E - Complex Manufacturing leading to ⬆️ Cost -Presence of inherent flaws
العمر يأثر بقي عقبال ما يبقي زي عمه الTi -Due to fracture and Aging susceptibility |
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GR.. Presence of Inherent flaws GR.. Inherent Flaws considered disadv |
Due to brittleness May lead to Catastrophic failure |
|
PEEK -ABBREV -Type of crystalline -linear or Circular -Thermoset or Thermoplastic - used for which app -Adv -Dis -Green Box MCQ : adding of what modify mech w Bio Prop of PEEK |
-Polyether ether keton
-semi انت نصي التاني
-linear
-Thermoplastic
المهندسين بيكملوا بيك - engineering applications
-E is close to Bone اهم واحد -Biocompatibility -Good Chemical w Fatigue w wear resistance
-Bioinert (do not Promote cell Adhesion (Osseointegration)) - Complex Manufacturing leading to ⬆️ Cost -Radiolucent
-C fibers -Bioactive glass |
|
Surface modification tech -GR Essay EXAM TTT of Surface is important -mech ex -Chemical ex -Physical ex - All of them eff on SA w by |
-⬆️ Clincial performance -Bone Healing acc ➕ -Bone growth stimulation ➕ -Enhance BTR
- Air abrasion (Sandblasting)
-Alkalization
- Plasma spraying
-⬆️... -Additive : Alkalization - subtractive : Anodization and Air Abrasion |
|
تجميعة للخواص من العبدلله 1)Ti 2)Zi 3)PEEK
- E - Strength -Wear Resistance -Biocompatibility Is in -Bioinert is ❌ in -Complex Manufacturing is ❌ in -Inherent Flaws is ❌ w present in -Radiolucent is ❌ in -Osseointegration is ❌ w not promoted in -Excellent Osseointegration is in -Which is semi crystalline -Which is Alternative to Ti -Which is used for engineering app -PEEK is Thermoplastic or Thermoset |
All -✅ Ti -❌Zi (Very high) -✅PEEK
1w 2 -✅Ti (⬆️) -✅Zi (Superior )
1 w 3 -❌Ti (⬇️) -✅PEEK(⬆️)
2 w 3 -Zi -PEEK
1 w 3 -Ti -PEEK
2 w 3 -Zi -PEEK
2 -Zi
3 -PEEK
3 -PEEK
2 -Zi
3 -PEEK انت نصي التاني
2 -Zi
3 -PEEK المهندسين بيكملوا بيك
-Plastic |