Proximal Contact Tightness of Zirconia Crowns: Digital Intraoral Scanning vs Conventional Impressions
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- The protocol lists: Digital intra oral scanning, Conventional impression.
- Who it may be relevant to
- Registry conditions: Proximal Contacts, Zirconia Crowns. Basic parameters: from 18 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- Pakistan
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
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Official title
Comparative Evaluation of Proximal Contact Tightness in Zirconia Crowns: Direct Digital Intraoral Scanning vs. Conventional Impressions Fabrication Method, A Randomized Control Trial.
Overview
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.
Detailed description
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.
Interventions
- Procedure Digital intra oral scanning
One groups prepared teeth will be scanned by a digital intra oral scanner. - Procedure Conventional impression
One group will recieve impressions conventionally in a tray with dental impression polyvinly siloxane.
Primary outcome measures
- Proximal contact tightness in terms of frictional force generated as shown on digital dynamometre in newtons at cementation day 1. [Time frame: Day 1 at cementation of crown.]
Secondary outcome measures (1)
- Proximal contact tightness of zirconia crowns in terms of frictional force in newtons as shown on digital dynamometre at the day 10. [Time frame: At 10 days after receiving the treatment crown]
Eligibility criteria
Inclusion criteria
- Patients seeking definitive full coverage ceramic crowns for molars.
- Patients in age group of 18- 47 years.
- Patients with healthy adjacent and opposing teeth.
- Patients with healthy periodontium.
Exclusion criteria
- Patients with grade 1 mobility in adjacent or opposing teeth.
- Patients with diastema in posterior teeth.
- Patients having severe malocclusion associated with traumatic occlusion.
- Patients with temporomandibular joint disorders.
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: Yes
Study design
- Allocation
- Non-randomized
- Model
- Parallel assignment
- Masking
- Triple blind
- Primary purpose
- Other
Study locations
Pakistan · 1 center
- Afid Rawalpindi — Rawalpindi
Identifiers
NCT: NCT07142746 · Proximal Contact Tightness