clinical biomechanics in implant dentistry

7/21/2019 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

clinical biomechanics in implant dentistry

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