Impression & Prosthesis Quality Made From Different Polyvinylsiloxane Impression Techniques

Dow University of Health Sciences

Status: Completed

Conditions: Discoloration, Tooth; Open Margin on Tooth Restoration; Endodontically Treated Teeth; Missing Teeth; Prosthesis Failure, Dental

Treatments: Device: Polyvinylsiloxane impression with different techniques

Study type: Interventional

Funder types: Other

Identifiers

NCT05938400

2932

Details and patient eligibility

About

This randomized controlled trial is to clinically assess and compare impression quality of polyvinylsiloxane impression material using one step (experimental) and two step (control) impression techniques and its effect on marginal fit of prosthesis and proximal contact of prosthesis.

Full description

Study participants will be randomly allocated to either of the two groups (experimental or control) through software-generated random numbers.

Indicated tooth will be prepared to receive a fixed prosthesis under local anesthesia as per standard guidelines.

Polyvinylsiloxane (PVS) impressions will be recorded in stock tray after moisture control, according to the assigned group.

In experimental group, light body and putty PVS will be mixed simultaneously and placed in stock tray to record impressions in single stage.

In control group, a putty PVS impression will be recorded first in stock tray and allowed to set. After setting of putty PVS, light-bodied PVS material will be applied to recorded impression surface and reseated in mouth to record final impression in second stage.

All impressions will be disinfected according to the recommended guidelines. All impressions will then be assessed by a senior clinician using 3.5 x magnification loupe and graded according to the selected criteria.

Impressions will then be poured in dental stone and prosthesis will be manufactured in dental lab.

Participants will be recalled for prosthesis trial and fit assessment of prosthesis margins using a dental explorer instrument and visual evaluation. Proximal contact of prosthesis will be graded according the criteria and assessed using dental floss.

Satisfactory prostheses will be cemented after final adjustments.

Enrollment: 62 patients

Sex: All

Ages: 18 to 60 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Indication of fixed-fixed partial denture or crown
• Good oral hygiene
• Sound abutment tooth (vital/non-vital)

Exclusion criteria

• Failure to provide written consent to participation in study
• Long span bridges (Greater than 3 units)
• Patients with bleeding disorders
• Cases indicated for resin-bonded prosthesis

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Double Blind

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62 participants in 2 patient groups

One step polyvinylsiloxane impression technique

Experimental group

Description:

All impressions in this group will be recorded in a single stage, mixing light-bodied PVS material and putty PVS material simultaneously and recording of impression of prepared tooth

Treatment:

Device: Polyvinylsiloxane impression with different techniques

Two step polyvinylsiloxane impression technique

Active Comparator group

Description:

All impressions in this group will be made in two stages, recording putty PVS impression first and then reloading it with light-bodied PVS material to record final impression.

Treatment:

Device: Polyvinylsiloxane impression with different techniques