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.
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.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Enrollment
62
One step impression technique will be compared with the standard two step technique
Dow University of Health Sciences
Karachi, Sindh, Pakistan
Incidence of defects in impression recorded to fabricate dental prosthesis as assessed by impression quality assessment scale
Outcome assessment scale: 1. Perfect impression, no voids or defects; 2. Acceptable impression, minimal defects in non critical region; 3. Unacceptable impression, defects involving critical region.
Time frame: 10 minutes
Incidence of prosthesis margin defects as assessed by Marginal adaptation assessment scale
Outcome assessment scale: 1. Adequate, adapted to tooth margins; 2. Inadequate, not accurately adapted to tooth margin
Time frame: 14 days
Incidence of prosthesis proximal contact inaccuracy as assessed by prosthesis contact assessment scale
Outcome assessment scale: 1. Acceptable, same as natural proximal contact on contralateral side; 2. Unacceptable; either tight or open proximal contact.
Time frame: 14 days
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