Benefit of the Digital Workflow for Screw-retained Single Implant Restorations

NCT03234868 | Completed Phase 4

• 1 other identifier: H2015-4
• Study Type: interventional
• Target: 34
• Locations: 0 countries
• Sites: N/A

Brief Summary

The aim of this research project is emphasize the benefit of the digital workflow compared to conventional impressions and crown processing with standard la procedures. The objectives of the present study are to measure and compare the global cost, the time spent in the dental chair and in the lab and the fit of both digital and conventional workflow. Additionally, patient centered outcomes will be recorded.

Conditions

Tooth Loss

Outcome Measures

Primary Outcomes (1)

• Fit of the crowns

  To measure this parameter we will focus on interproximal fit and occlusion. Interproximal contact points will be checked with dental floss.

  1 year

Secondary Outcomes (5)

• Time consumption at the dental chair

  1 year

• Time consumption in the lab

  1 year

• Global cost

  1 year

• Esthetical aspect

  1 year

• Patient centered outcomes

  1 year

Study Arms (4)

Optical impression

EXPERIMENTAL

The optical impression system used for the study is TRIOS (3 shape). First of all, the operators in charge of taking the digital impressions are going to get trained prior the study and will calibrate (learning curve). MIS Scan bodies will be placed on the multi-unit plaforms, an x-ray will be taken in order to check the fit) and the impression will be realised following the instruction given by the system (first the maxillary and mandibular impressions followed by the bite registration). Shade will be chosen using VITA toothguide 3D master (to pick the right zirconia shade).

Device: Impression procedure

Conventional impression

ACTIVE COMPARATOR

Once the impression coping is placed on the multi-unit plaform, the fit will be checked with an intra-oral X-ray. The impressions will be made with medium viscosity silicon. As a second step, alginate antagonist impression will be done. Bite will not be recorded (single tooth missing). The two impressions will be placed in a hermetic plastic bag and send to lab. Shade will be chosen using VITA toothguide 3D master.

Device: Impression procedure

Digital workflow

EXPERIMENTAL

The implant crowns issued from digital impressions will be done according a cast less / full digital workflow. The STL files collected from the TRIOS will be sent directly to the lab. The designing of the full zirconia crowns will be performed in the TRIOS 3SHAPE program. The resulting files will be sent to the CAM unit production (Amman Girrbach milling machine \& MAZAK CNC machine: Mcenter to be specify (Berlin or Israel) to be milled (milled \& sintered only) considering the direct adaption for a Multi-Unit connection. A superficial make-up will be done on the monolithic crown in the lab. And finally, the products will be delivered to the dentist.

Device: Crown manufacturing procedures

Conventional workflow

ACTIVE COMPARATOR

The implant crowns issued from conventional impressions will be realised by sending the impressions to the lab (Mirko Picone). The lab will pour the impressions in dental stone (class 4 scannable without powdering: extra hard and scanning powder included). Then, the technician will realize a mock-up of the crown's framework on a temporary abutment in DuraLay Resin. The mock up will be scanned with ZIRKONZAHN scanner (or equivalent) and send this information to a central fabrication facility for milling (Amman Girrbach milling machine \& MAZAK CNC machine: Mcenter: to be specify (Berlin or Israel). The lab technician will get the Zi framework back and will apply veneer ceramic.

Device: Crown manufacturing procedures

Interventions

Impression procedure DEVICE

Each patient will go through both type of impression during single appointment: first the digital impression and then the conventional one (to avoid residual impression materials for the optical impressions). The time necessary for each procedure will be recorded.

Conventional impression; Optical impression

Crown manufacturing procedures DEVICE

Test and control implant crowns will be screw-retained on a multi-unit abutment. The conventional crown will be made of a Zirconia framework veneered with cosmetic ceramics directly screwed on the multi-unit platform (no titanium base). The experimental crown will be made in full zirconia and designed in the TRIOS software.

Conventional workflow; Digital workflow

Eligibility Criteria

• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Child (0-17), Adult (18-64), Older Adult (65+)

You may qualify if:

• Subject must have voluntarily signed the informed consent form before any study related action
• Age: 18 with one or more missing teeth in the maxillary area, seeking for implant therapy.
• Men/Women
• In good systemic health (ASA I/ II)
• Present with no contra indication against oral surgical interventions
• Patients required replacement of a single missing tooth. The tooth at the implant site(s) must have been extracted or lost at least 12 weeks before the date of implantation.
• At least 10 mm of bone in the vertical dimension
• At least 6 mm of bone in the bucco-lingual dimension.
• No need for bone augmentation procedure in any of the dimensions
• Full mouth plaque score (FMPI) lower or equal than 25%

You may not qualify if:

• Autoimmune disease require medical treatment
• Medical conditions requiring prolonged use of steroids
• Use of Bisphosphonate intravenously or more then
• Infection (local or systemic) - patient with gingivitis or active local infection will undergo a medical treatment prior to his entrance to the study, each individual will be evaluated prior to study procedure for suitability, in case of systemic infection the evaluation will be based on medical anamneses, and if necessary will be referred to relevant medical tests.
• Current pregnancy or breastfeeding women
• Alcoholism or chronically drug abuse
• Immunocompromised patients
• Uncontrolled Diabetes
• Smokers
• Prisoners

Sponsors & Collaborators

• University of Liege: lead

MeSH Terms

Conditions

Tooth Loss

Condition Hierarchy (Ancestors)

Periodontal Diseases; Mouth Diseases; Stomatognathic Diseases; Tooth Diseases

Study Design

• Study Type: interventional
• Phase: phase 4
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Prof.

Study Record Dates

• First Submitted: April 13, 2017
• First Posted: July 31, 2017
• Study Start: January 1, 2016
• Primary Completion: June 1, 2017
• Study Completion: June 1, 2017
• Last Updated: July 31, 2017

Record last verified: 2017-07