An interventional study of Digital intra oral scanning and Conventional impression in Proximal Contacts and Zirconia Crowns, sponsored by Armed Forces Institute of Dentistry, Pakistan. Not yet recruiting at 1 site in Pakistan. Open to participants aged 18 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2025-08-27.
Sponsored by Armed Forces Institute of Dentistry, Pakistan · Not applicable, Interventional, and Other
We will be comparing the proximal contacts of zirconia crowns and adjacent natural teeth in two groups. One receiving crowns fabricated via digital intra oral scanning means. And the other group recieving crowns fabricated via the dental impression method using trays and impression material.
Subjects will be randomly assigned in two groups using a computer generated randomization list. Allocated subjects in groups will be concealed in an envelope. All clinical procedures of crown preparation and cementation will be performed by a single clinician with standard crown preparation guidelines to minimize variability. After standardized tooth preparation for full coverage ceramic crowns, one group will receive conventional impressions using polyvinyl siloxane (PVS) material in trays and other group will be scanned using intra oral digital scanner. Crowns for both groups will be fabricated in the same dental laboratory under standardized conditions.
Proximal and occlusal adjustments will be performed in the oral cavity before cementation at try in and crowns will be cemented using the same luting agent, GIC. After cementation proximal contact tightness will be assessed for the crowns by the digital force gauge at mesial and distal contacts and recorded for data compilation. The 0.05mm metal strip is inserted between the prosthesis and the adjacent natural tooth. The frictional force generated while removing the metal strip slowly in the buccal direction will be recorded on the screen of the customized digital force gauge. The frictional force generated will be considered equal to the proximal contact tightness and will be recorded in Newton (N). Proximal contact tightness will be recorded immediately after the crowns were cemented and at a recall after 10 days. These proximal contact tightness will be compared to see if there lies a significant difference in between the crowns fabricated from both impression techniques.
Armed Forces Institute of Dentistry, Pakistan is the lead sponsor of 27 studies on the registry; 10 are open to participants now.
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One group will be receiving the impression for zirconia crowns by trays and conventional impression material.
Procedure: Conventional impression
One group will recieve digital intra oral scan for obtaining digital scan of anatomy of prepared teeth.
Procedure: Digital intra oral scanning
One groups prepared teeth will be scanned by a digital intra oral scanner.
One group will recieve impressions conventionally in a tray with dental impression polyvinly siloxane.
Proximal contact tightness in terms of frictional force generated as shown on digital dynamometre in newtons at cementation day 1.
Proximal contact tightness will be assesed when shimstock will be pulled out by a hook attached to a digital dynamometre. The frictional force generated in newtons will be assesed and noted at the day 1 of cementation.
Time frame: Day 1 at cementation of crown.
Proximal contact tightness of zirconia crowns in terms of frictional force in newtons as shown on digital dynamometre at the day 10.
We will assess the proximal contact tightness of zirconia crowns with adjacent teeth as we pull shimstock with a hook attached to digital dynamometre and asses the frictional force generated in Newtons at the day 10 of cementation of crown.
Time frame: At 10 days after receiving the treatment crown
Plan to share: No
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This study is not yet recruiting, as verified in Aug 2025. You cannot join it, but the record below documents what was studied.
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Armed Forces Institute of Dentistry, Pakistan