Download - Clinical Biomechanics in Implant Dentistry
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Clinical biomechanics inimplant dentistry
Presented byS.Santhosh
PG studentDept. of prosthodontics
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INTRODUCTION
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IN TIS N!"
!R#
DI#GNOSIS
TR!#T$!NT P%#NING
&IN#% R!STOR#TION
BIOMECHANICS
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'iomechanics is concerned (ith theresponse of biolo)ical tissues toapplied loads
It uses the tools and methods ofapplied en)ineerin) mechanics tosearch for structure*functionrelationship in li+in) materials
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&orces
Compressi+e
Tensile
shear
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#%* #,I#% %O#DING
%%* %#T!R#%%O#DING
O%* O'%I-U!
%O#DING
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Compressi+e forces tend to maintainthe inte)rity of bone implantinterface
Shear and tensile stress ho(e+ertend to disrupt the interface
Cortical bone is stron)est incompression and (eaest in shear
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Implant )eometry
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Stress
The manner in (hich a force isdistributed o+er a surface is referredto as mechanical stress
Stress / &orce
#rea
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Stress depends on t(o factors0 force
and cross sectional area &orce can1t be controlled but the
ma)nitude of force can be controlled.
2. Cantile+er len)th
3. O4set loads
5. Cro(n hei)ht6. Ni)ht )uards
7. Occlusal material
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&unctional cross sectional area can beincreased
by0
2. Increase the number of implant foran edentulous site
3. Selectin) (ider and lon)er implantthereby increasin) the surface area
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Strain
Deformation as a result of a loadapplied is strain
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Stress* strain relationship
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$odulus of elasticity
8oun)1s modulus/ stress
strain
Cortical bone is 7 timesmore 9e:ible than titanium
#s the stress ma)nitudeincreases; elastic modulusdi4erence increases
The bone can stay incontact (ith titanium morepredictably (hen stress islo(
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Tor
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#nterior impact area
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&orce deli+ery and failure
mechanism
$O$!NT %O#DS0
The moment of a force around apoint produces rotation or bendin)about that point
It is )i+en by product of force timesthe perpendicular distance point of
interest to the line of action of force
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Clinical moment arms
Occlusal hei)ht
Cantile+er len)th
Occlusal (idth
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Occlusal hei)ht
#cts as moment arm for forcesdirected alon) bucco lin)ual a:is
2. 'alancin) and (orin)contacts
3. Ton)ue thrust
5. &orces form oralmusculature
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ybrid prosthesis
"hen the a+ailableprosthetic space ismore than 27mm
# =:ed ceramo metalprosthesis increasesbul
Increased cro(n hei)htinduces more lateral
forces ybrid prosthesis
decreases the impactforce as the occlusal
material is acrylic resin
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Cantile+er len)th
$ / force > distance / 2?? : 2.7 / 27? N*cm
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$echanical ad+anta)e
cantile+erlen)th
#*P spread
$a)nitude of force@#nt. ImplantA
$.# , force
Distal implant / forceon anterior implant B
ori)inal force
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#*P SPR!#D
%!NGT O& C#NTI%!!R / 3.7 TI$!S T! #*P SPR!#D
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OCC%US#% "IDT
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$a:illary full arch =:ed implant
=:ed prosthesis
&rom biomechanical perspecti+e; theimplant restored anterior ma:illa isoften the (eaest section compared
(ith other re)ions
Narro( rid)e and need for narro(implants
&acial cantile+ers
Obli
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Completely edentulousma:illa
Number of implants
Position of implants'IO$!C#NICS
S-U#RIS OOIDT#P!RING
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D!NT#% #RC &OR$*S-U#RIS
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T#P!RING
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OOID #RC &OR$
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I$P%#NT NU$'!R POSITION
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INT!RN#TION#% EOURN#% O& OR#% #ND $#,I%%OCI#% I$P%#NTS
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Conclusion
Implant failure after prosthesis deli+ery aremainly related to biomechanicalcomplications.
arious factors such as loadin) condition;prosthesis type; implant position; number;
desi)n; bone type and bone implant interface
Understandin) the +arious biomechanical
properties is essential for impro+in) thelon)e+ity of restoration.
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R!&!R!NC!S
1. Dental implant prosthetics, Carl.E.Misch 3rdedition
2. Steen !. Sado"s#$, DDS, %he implant&s'pported prosthesis (or the edent'io's arch)
Desi*n considerations, !+D O%U$! F NU$'!R 25. !*E. Richter et al; 'asic biomechanics of dental
implants in prosthetic dentistry;!+D MA 1-/O0ME 1 NMBE
6. The in9uence of functional forces on thebiomechanics of implant*supported prosthesesHare+ie(; Saime S ahin; $urat C. C ehreli; !mine ;
!o'rnal o( Dentistr$ 5? @3??3A 3F2J33
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7. #nalysis of load transfer and stressdistribution by an implant*supported =:edpartial denture; Da+id #ssif, !+D , March1--
K. 'iomechanical interactions in toothJimplant*supported =:ed partial dentures
(ith +ariations in the number of splintedteeth and connector type0 # =nite elementanalysis
F. Occlusal considerations in implant
therapy0 clinical )uidelines (ithbiomechanical rationale; Clin. Oral Impl.es. 2K; 3??7 L 3KJ57