Proximal Contacts, Zirconia Crowns
Conditions
Brief summary
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
PROCEDUREDigital intra oral scanning
One groups prepared teeth will be scanned by a digital intra oral scanner.
PROCEDUREConventional impression
One group will recieve impressions conventionally in a tray with dental impression polyvinly siloxane.
Sponsors
Armed Forces Institute of Dentistry, Pakistan
Study design
Allocation
NON_RANDOMIZED
Intervention model
PARALLEL
Primary purpose
OTHER
Masking
TRIPLE (Caregiver, Investigator, Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
Yes
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.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Proximal contact tightness in terms of frictional force generated as shown on digital dynamometre in newtons at cementation day 1. | Day 1 at cementation of crown. | 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. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Proximal contact tightness of zirconia crowns in terms of frictional force in newtons as shown on digital dynamometre at the day 10. | At 10 days after receiving the treatment crown | 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. |
Countries
Pakistan
Contacts
Primary ContactAleeha Dr Aleeha Zahoor, BDS
Outcome results
None listed