Discoloration, Tooth, Endodontically Treated Teeth, Missing Teeth, Open Margin on Tooth Restoration, Prosthesis Failure, Dental
Conditions
Keywords
Polyvinylsiloxane impression, fixed prosthetics, impression techniques, single stage impression, two step putty wash impression, marginal fit, prosthesis fit, endodontically treated teeth
Brief summary
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.
Detailed 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.
Interventions
DEVICEPolyvinylsiloxane impression with different techniques
One step impression technique will be compared with the standard two step technique
Sponsors
Dow University of Health Sciences
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
DOUBLE (Subject, Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
18 Years to 60 Years
Healthy volunteers
Yes
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
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Incidence of defects in impression recorded to fabricate dental prosthesis as assessed by impression quality assessment scale | 10 minutes | 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. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Incidence of prosthesis margin defects as assessed by Marginal adaptation assessment scale | 14 days | Outcome assessment scale: 1. Adequate, adapted to tooth margins; 2. Inadequate, not accurately adapted to tooth margin |
| Incidence of prosthesis proximal contact inaccuracy as assessed by prosthesis contact assessment scale | 14 days | Outcome assessment scale: 1. Acceptable, same as natural proximal contact on contralateral side; 2. Unacceptable; either tight or open proximal contact. |
Countries
Pakistan
Outcome results
None listed