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Digital Versus Conventional Impression Technique in Mandibular Arch

A

Ain Shams University

Status

Active, not recruiting

Conditions

Edentulous Jaw

Treatments

Device: intraoral scanner of splinted scan bodies
Device: impression material
Device: intraoral scanner of nonsplinted scan bodies

Study type

Interventional

Funder types

Other

Identifiers

NCT05770011
2351992

Details and patient eligibility

About

Objectives: Passive fit of screw retained frameworks is essential to avoid biological and mechanical failures in addition to transmission of unfavourable stresses to the bone-implant interface. However, Several factors contribute to the passive fit of screw retained prosthesis such as relative parallelism between the implants, implant number, impression material, impression technique and method of prothesis fabrication. The current study aims to evaluate the accuracy of three different impression techniques on the fit of screw retained bar splinting two inter-foraminal implants.

Methods: The study presents evaluation of the passive fit of screw retained bar fabricated with three different impression techniques.

Full description

Surgical guide will be designed for completely edentulous patients. It will be inserted into the patient's mouth, stabilized against the upper denture and secured in place. dental implants will then be placed.

For bar fabrication using the first impression technique, closed-top primary impressions will be made followed by open top secondary impression. Extraoral scanning of the impression will be done followed by digital fabrication of the bar.

For bar fabrication using the second impression technique, scanning of the lower arch will be done using Omnicam intraoral scanner. Scanning will be done by a single calibrated operator who is trained on intraoral scanning techniques.

Scan bodies will be then screwed to the implants and scanning will be done. Both scans will be previewed on the computer desktop and superimposed together. A Standard tessellation language file will be then exported, downloaded and previewed in Inlab Exocad software .Implant system and the bar design will be selected from the software library. Then, the Standard tessellation Language file will be exported to the milling machine and milling of Cobalt chromium bar will be done.

For bar fabrication using the third technique, splinting of scan bodies will be done followed by intraoral scanning of the lower arch.

Enrollment

54 patients

Sex

All

Ages

50 to 65 years old

Volunteers

Accepts Healthy Volunteers

Inclusion criteria

    • Patients' age range from 50 to 65 years old.
  • Good oral hygiene is mandatory.
  • Sufficient restorative space (15mm) to accept implant supported over denture diagnosed by mounting the diagnostic casts.
  • Firm and healthy mucosa covering the alveolar ridge.
  • Minimum bone width 5.5 mm buccolingually and of 12 mm bone height as diagnosed from the pre-operative cone beam computed tomography scan.

Exclusion criteria

  • Heavy smokers.
  • Patients with para functional habits.
  • Tempromandibular Joint Disorders. (TMJ disorders)
  • Patients with systemic disorders that may affect the results of this study.
  • V-shaped dental arch.

Trial design

Primary purpose

Treatment

Allocation

Randomized

Interventional model

Parallel Assignment

Masking

Triple Blind

54 participants in 3 patient groups

Conventional impression
Active Comparator group
Description:
Impression will be taken conventionally using rubber base open tray
Treatment:
Device: impression material
digital impression without splinting the scan bodies
Experimental group
Description:
Impression will be taken by intraoral scaner
Treatment:
Device: intraoral scanner of nonsplinted scan bodies
digital impression with splinting the scan bodies
Experimental group
Description:
Impression will be taken by intraoral scaner
Treatment:
Device: intraoral scanner of splinted scan bodies

Trial contacts and locations

1

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Central trial contact

Bassant Sherif, BDS MSc; Ahmed Mostafa, BDS MSc PhD

Data sourced from clinicaltrials.gov

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