Impression Techniques of Dental implants - PowerPoint Presentation

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Impression Techniques of Dental implants

Dr. Sabreen Waleed Aswad

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Dental implantDental implant is a prosthetic device of alloplastic material(s) inserted into the oral tissues to provide retention and support for a fixed or removable prosthesis

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Osseointegration : direct structural and functional connection between the living bone and the surface of implant without interposition of connective tissue

3Implant components

1.

Main components implant body or fixture Abutment Superstructure 2. Accessories Surgical Healing screw Gingival formerb)

Prosthetic

Impression post

Implant analogue

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Impression materials5

The

impression material used should beeasy to mixaccurate reproduction of details.impression material used should be flexible Enough working timerapidly setting

And dimensionally

stable following

removal from

the mouth.

The

materials that

fulfil these

criteria

are

Vinyl

polysiloxanes

silicones and

polyether rubber base

impression materials.

IMPRESSION TECHNIQUES

Implant impression techniques

can be classified as either direct(open tray, pick up) and indirect (closed tray, transfer). 6

Indirect (Closed tray, transfer) technique

(a)Exposed fixture head after removal of the healing

Abutment (b) closed tray impression copingscrewed in place7

Closed tray technique

(c) light bodied impression

material syringed around impression coping(d)impression taken in a stock tray.8

Closed tray technique

(e) impression with details of soft tissue around

the implant and adjacent teeth (f) impression coping repositioned into theimpression9

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Snap-On Impression Technique

Indications1-

Limited inter-arch space

2- Tendency to gag3- Difficult to access in posterior region Advantages:1. Time saving

2.

More comfortable for both the clinician

and the

patient

3.

Easy to

manipulate

4. Does not need for especial preparation in the tray

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Disadvantages:1. Might be less accurate especially in multiple fixtures.

2. With the increased divergent of the posts the impression material might be distorted

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Open tray technique

(a) impression copings in place, (b)open custom tray with window sealed with wax, (c)impression in place with the tips of the impression copings projecting through the wax window ,(d) the completed impression with the impression copings in situ

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14The direct technique can be further

subdivided into splinted and non-splinted techniques.

The splinting procedure is recommended in case of multiple implants to decrease the amount of distortion and to improve impression accuracy and implant stability.

Open tray technique indicated in case of multiple implants and very closely located implants.

15The advantage of this technique is reduce the errors, more precise.Disadvantages include: Take time Not suitable for pt. with limited inter-arch space, uncooperative pt. and gag pt.

16Digital Implant Impression

More recently, one of the major developments in

implant prosthodontics has been the adoption of engineering principles in the form of computer-aided design and computer aided manufacturing (CAD/CAM) to construct implant prosthesis. This technology utilizes 3- D intraoral scanners which alter the way we take impressions .

17Requirements of a digital

impression

The main requirements for the CAD/CAM are (1) the digital scanner (2) software that processes the data and creates a CAD model (3) a production technology that transforms the data set into the desired product by means of CAM

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Advantages of the digital impression are as follows

:1.Improved patient acceptance.2. Reduced distortion of impression materials.3. time effectiveness

Accuracy of impression

Many factors determine the accuracy of an impression:

Number of implantsPosition of implantsImpression materialClinical training 19

Thank you

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