Conventional Impressions Versus Digital Impression Techniques for Implant Supported Screw Retained Prosthesis

Study Overview
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Brief Summary
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The purpose was to evaluate the accuracy of traditional and digital implant level impression procedures by using three-dimensional superimposition analysis , and evaluate the passive fit of screw- retained implant supported restorations fabricated using conventional and digital impression techniques in bilateral distal extension cases (class I kennedy classification)

Detailed Description
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Eight patients who had missing all mandibular posterior teeth except first premolars were included in this study. In each patient, 4 implants were placed, 2 in each side to support 3 units screw retained zirconia restorations. Three months after implant placement, each patient underwent two implant level impression techniques (n=8) for each technique: Conventional implant impressions CII (pick-up, splinted transfers), and digital implant impressions DII were captured with TRIOS 3 Shape intraoral optical scanner. In this study, digital impression was considered as a reference data.

Official Title
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Evaluation of the Accuracy of Conventional and Digital Implant Impression Techniques in Bilateral Distal Extension Cases

Conditions
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Partial Edentulism Class 1

Intervention / Treatment
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* Procedure: Implant placement


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: All participants have sufficient bone length and width for implant insertion. General health of the patients was evaluated by taking a full medical history to ensure that these patients were free from any systemic conditions that would have impaired implant osseointegration Good oral hygiene Sufficient inter-arch spaces The opposing arch was almost dentulous, and any missing teeth were restored using a fixed partial denture. Exclusion Criteria: parafunctional habits Heavy smoking Those patients with systemic diseases that may influence soft or hard tissue healing. Patients with a history of radiation therapy in the head and neck region. Patients with a history of radiation therapy in the head and neck region.

Ages Eligible for Study
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Minimum Age: 30 Years
Maximum Age: 55 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Accuracy of Implant impression techniques<br>Active comparative : digital implant impression Participants underwent intra-oral scanning digital impression Experimental : conventional implant impression Participants underwent conventional impressions And right side of pt mouth received screw retained prosthesis constructed from conventional impression left side received screws retained prosthesis constructed from digital impression | Procedure: Implant placement<br>* 4 implants were placed , 2 implants in each side of the patient mouth opposite lower second premolar and second molar 4 implants were placed , 2 implants in each side of the patient mouth opposite lower second premolar and second molar<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Accuracy of digital and conventional implant impression techniques in partially edentulous patient | GOM Inspect 2016, Gom GmbH,) that was used to superimpose the Standard tessellation language (STL) datasets of conventional open tray impression technique onto the STL file of the reference (digital implant impression technique) to assess the accuracy and calculate the three-dimensional deviations of scan bodies in color- coding map in micrometers (µm) | 12 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Digital impression, implant impression, impression accuracy, Digital work flow