presented by: dr. tushar bhagat - psau.edu.sa€¦ · 1 presented by: dr. tushar bhagat contents v...

08-12-2015

1

Presented By: Dr. Tushar Bhagat

Contentsv Introduction

v Steps in implant loading

v Implant components

v Types of Implant impression

v Techniques

v Impression material science

v Disinfection

v References2

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08-12-2015

Introduction

v Dental implants has been proven successful in treatment of;

Ø Edentulous patients

Ø Partially edentulous patients

Ø Orthodontics Implants for anchorage

Ø Implants for Maxillofacial prosthesis3

Introduction

v Successful result can be achieved only when precisely fitting prosthesis

are fabricated for Dental implants.

v Precisely fitting prosthesis can be achieved by ;

Ø Good impression &

Ø Suitable abutment selection.4



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Introduction

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v Two stage implant

v Single stage / Immediate loading implant

Introduction (Components of implants)

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1. IMPLANT BODY

q Component placed within bone

q Various macroscopic body designs

q Made of titanium / titanium alloys

q Has 3 parts – crest module, body , apex.

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CRESTMODULE

IMPLANTBODY

APEX


2. HEALING SCREW –

q Component that seals and maintains the patency

of the internal threaded section of implant during

healing phase

q Ensures bone does not grow over edge of the

implant

q Affects fit of subsequent components

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3. INTERIM ABUTMENT -

q Component that serves to support a fixed or

removable prosthesis

q Helps develop permucosal seal and emergence

profile around implant

q Known as Permucosal Extension, Healing

Abutment

9Emergence profile around implant


4. ABUTMENT -

q Component that supports or retains a prosthesis /

implant superstructure.

q 3 types

I. Abutment for screw retention

II. Abutment for cement retention

III. Abutment for attachment

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Attachment

Cement retention

Screw retention

I

II

III



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5. IMPRESSION COPING -

q Component that is used to position an analog in

an impression and transfer to master cast.

q 2 types

q Indirect transfer coping

q Direct transfer coping

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Pick up typecoping

Guide pin


6. IMPLANT ANALOG

q Component that is used in the

fabrication of the master cast to

replicate the retentive portion of the

implant body or abutment.

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IMPLANTANALOG



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7. PROSTHESIS RETAINING SCREW -

q Component that penetrates the fixed

restoration and secures it to the

abutment.

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Types of Impression (3 types)

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I. Based on tray used for impression.

II. Based on type of custom tray used

III. Based on level at which impression is made.



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Types of Impression (3 types)

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I. Based on tray used for impression.

II. Based on type of custom tray used

III. Based on level at which impression is made.

STOCK TRAY CUSTOM TRAY

Open tray impression concept

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Intraoral situation

Implant & impression postAnalog & impression post



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§ Componentso Impression post, Guide screw.

§ Benefitso Color-coded components correspond to prosthetico Connectiono High precision impressiono Clear-cut tactile response for accurate positioningo Guide screw can be tightened by hand or with the

Screwdriver

v Impression components are intended for single use only 19

Analog & impression post


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§ Remove closure screw or healing abutment

§ Insert impression post and hand tighten screw with the Screwdriver



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§ Take impression with an open tray

§ Use an elastomeric impression material


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§ When impression material is set,unscrew and remove the impression



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§ Screw the implant analog onto the impression post andcast master model

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Case Done by : Dr. Tushar Bhagat.(Nov,2010)



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It’s recommended to

articulate the master

model before making the

restoration

Close tray impression concept

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§ Remove closure screw or healing abutment

§ Insert impression post and hand tighten screw with the Screwdriver



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§ Snap impression cap onto the impression post


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§ Take impression with a closed tray

§ Use an elastomeric impression material



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§ Remove the impression§ Remove the impression post from implant§ Mount impression post onto the analog.§ Reposition and snap back into the impression


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§ Cast master model

§ Articulate the master model before making the restoration



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Impression material science

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§Extensive variety of impression material are available for making a

precision negative mold of soft & hard tissues.

§They are of following type;

REVERSIBLE HYDROCOLLOID

POLYSULFIDE

POLYETHER

SILICONE



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Summary of impression material

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Advantage Disadvantage Uses Precaution

Polysulfide High tear strength Unpleasant odourLong setting time

Most cases Pour within 1 hour

Condensationsilicone

Short setting Hydrophobic Most cases Delayed pour

Addition silicone Short setting Hydrophobic Most cases Delayed pour

Polyether Dimensional stability Very stiff Most impression Care not to breakteeth

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• Immediately rinsed with tap water.

• Because of distort & absorb moisture polyether & hydrophilic

addition silicone impression disinfectant should be sprayed & store in

plastic bag rather than submerged & soaked in gulteraldehyde.

Disinfection for impression



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Disinfection for impression

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Alginate Agar Polysulfide Silicone Polyether

Gluteraldehydes 2% (soak10mins)

Notrecommended

Notrecommended

Yes Yes No

Iodophor1:213 dilution

Yes Yes Yes Yes Yes

Chlorinecompound

Yes Yes Yes Yes Yes

Phenol Notrecommended

Yes Yes Yes No

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References

1) Impression technique for implant dentistry, by Dr. Ken Mun Wong.

Implants;2_2012. p.no.17-20.

2) Obtaining impression for clinically successfully implant supported

restoration, by Scott D. Ganz. Master of Impression;p.no.6-11.

3) Contemporary fixed prosthodontics, by Rosentiel, Land & Fujimoto.

P.no.440-462.

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