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Esthetic Outcomes of Immediately Placed Implants Receiving Immediate Provisionalization and Delayed Restoration

This study is ongoing, but not recruiting participants.
ClinicalTrials.gov Identifier:
First Posted: August 19, 2013
Last Update Posted: May 23, 2017
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Information provided by (Responsible Party):
Hom-Lay Wang, DDS, MSD, Ph D, University of Michigan
The purpose of this study is to compare two different timings of restoring dental implants that are placed right after tooth extraction: The test group will have the provisional crown placed at the time of implant placement. The control group will have the tooth removed and the implant placed at the same appointment but restorations placed after 4 months. Both procedures currently are accepted methods for replacing missing teeth but direct comparisons of the two procedures are lacking. The results of this study should aid clinicians in selecting the best timing for restoring implants for their patients. The hypothesis is that immediate restoration might increase aesthetic outcomes, e.g. less mucosal recession.

Condition Intervention
Tooth Diseases Tooth Extraction Dental Implant Device: Test (immediate restoration) Device: Control: delayed restoration

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Treatment

Further study details as provided by Hom-Lay Wang, DDS, MSD, Ph D, University of Michigan:

Primary Outcome Measures:
  • mucosal recession [ Time Frame: 1 year ]

Secondary Outcome Measures:
  • radiographic marginal bone level change [ Time Frame: 1 year ]

Enrollment: 40
Study Start Date: December 2015
Estimated Study Completion Date: March 2019
Estimated Primary Completion Date: March 2019 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Test (immediate restoration)
Test (immediate restoration): immediate restoration will be placed on immediately placed implants.
Device: Test (immediate restoration)
Test (immediate restoration)
Experimental: Control: delayed restoration
Control: delayed restoration: immediate placed implants will be restored at 4 months.
Device: Control: delayed restoration
Control: delayed restoration

Detailed Description:

A single center, randomized controlled, parallel-arm study is planned to investigate esthetic outcomes after immediate placement and restoration in the esthetic zone. Forty adult patients who have a hopeless maxillary anterior or premolar tooth, with intact adjacent teeth will be enrolled. A signed written informed consent will be obtained after he or she has been given verbal and written information describing the nature and duration of the study. Subjects will not be screened or treated until an informed consent has been obtained. Patient information will be protected according to the privacy regulations of the Federal Health Insurance Portability and Accountability Act of 1996 (HIPAA).

The enrolled patients will be randomly placed into one of two treatment groups, immediate implant placement (IIP) and restoration group (IR) or the IIP + delayed restoration group (DR). For all patients, the hopeless tooth will be extracted atraumatically and an implant placed immediately. The decision will be made randomly to either restoring the implant immediately (Test group) with a provisional crown or restoring the implant at 4 months after implant placement (Control group). Outcome analyses will be performed until approximately 1-year after the implant surgery and primarily evaluate clinical and radiographic parameters to determine the esthetic outcomes of immediately restored IIP implants, in comparison to those immediately placed but restored in a delayed approach.


Information from the National Library of Medicine

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Ages Eligible for Study:   21 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Male or female, aged 21 or older
  • A minimum dentition of 20 permanent teeth (including natural rooted teeth or dental implants; pontic of a fixed bridge is not considered a tooth)
  • A maxillary premolar, canine, lateral incisor or central incisor with a hopeless prognosis
  • Presence of adjacent teeth and enough clearance for an implant crown
  • Presence of sufficient bone apical to the root apex of the hopeless tooth

Exclusion Criteria:

Systemic criteria:

  • Current heavy smokers (>10 cigarettes per day) or heavy smokers who quitted less than 1 year
  • Pregnant or plan to get pregnant or lactating mothers
  • Diseases of the immune system or any medical condition that may influence the outcome (uncontrolled diabetes (HbA1c >7), neurologic or psychiatric disorders, systemic infections, …)
  • Radiation therapy in the head and neck area within 3 years
  • Current use of oral bisphosphonates for >3 years
  • History of IV bisphosphonates use
  • Other medical conditions that may contradict an implant surgery

Intraoral criteria:

  • Area of study is adjacent to an existing implant
  • Acute infection at/or adjacent to the extraction site (e.g., sinus tract, swelling, etc.)
  • Observable gingival changes due to use of medications such as calcium antagonists, anticonvulsives, immunosuppressives, anti-inflammatory medications, etc.)
  • Untreated deep carious lesions or defective restorations that can potentially exacerbate during the course of the experiment
  • Uncontrolled periodontal disease
  • Poor oral hygiene (>20% FMPS)

CBCT criteria:

• More than 4 mm of buccal plate dehiscence is present on CBCT scans

Intraoperative criteria:

• More than 4 mm of buccal plate dehiscence is present once the tooth is extracted

  Contacts and Locations
Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01925339

United States, Michigan
University of Michigan School of Dentistry
Ann Arbor, Michigan, United States, 48105
Sponsors and Collaborators
University of Michigan
Principal Investigator: Hom-Lay Wang, DDS, MSD, PhD University of Michigan
  More Information

Responsible Party: Hom-Lay Wang, DDS, MSD, Ph D, Collegiate Professor of Periodontics and Professor of Dentistry, University of Michigan
ClinicalTrials.gov Identifier: NCT01925339     History of Changes
Other Study ID Numbers: HUM00070747
First Submitted: August 15, 2013
First Posted: August 19, 2013
Last Update Posted: May 23, 2017
Last Verified: May 2017

Additional relevant MeSH terms:
Tooth Diseases
Stomatognathic Diseases