Proximal Contact Tightness of Zirconia Crowns: Digital Intraoral Scanning vs Conventional Impressions (PCT)

Armed Forces Institute of Dentistry, Pakistan

Status: Not yet enrolling

Conditions: Zirconia Crowns; Proximal Contacts

Treatments: Procedure: Conventional impression; Procedure: Digital intra oral scanning

Study type: Interventional

Funder types: Other

Identifiers

NCT07142746

Proximal Contact Tightness

Details and patient eligibility

About

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.

Full 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.

Enrollment: 75 estimated patients

Sex: All

Ages: 18+ years old

Volunteers: Accepts Healthy Volunteers

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.

Trial design

Primary purpose: Other

Allocation: Non-Randomized

Interventional model: Parallel Assignment

Masking: Triple Blind

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75 participants in 2 patient groups

Conventional impression

Active Comparator group

Description:

One group will be receiving the impression for zirconia crowns by trays and conventional impression material.

Treatment:

Procedure: Conventional impression

Digital Intra Oral Scanning

Experimental group

Description:

One group will recieve digital intra oral scan for obtaining digital scan of anatomy of prepared teeth.

Treatment:

Procedure: Digital intra oral scanning