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Osseointegrated Dental Implants in Kidney Transplanted Patients

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. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. Identifier: NCT02513602
Recruitment Status : Recruiting
First Posted : July 31, 2015
Last Update Posted : November 2, 2016
Information provided by (Responsible Party):
prof. Roberto Di Lenarda, University of Trieste

Brief Summary:
The evaluation of the bone, using several techniques and on several aspects will be the purpose to study the possible impact of the kidney transplant (and, extensively, the pre-transplant dialysis, the organ replacement and the immunosuppressive therapy) could have on the bone metabolism and on the density of the bone where the implants are placed. The assessment on the bone density only in a retrospectively selected population that underwent the same surgical procedure will help the comparison of the data to get a satisfactory conclusion. The evaluation of other clinical and instrumental parameters in the test group makes the kidney-transplant patients bone quality clear, and will consequently demonstrate if implants are a feasible therapy for these patients.

Condition or disease Intervention/treatment
Tooth Loss Disorder Related to Renal Transplantation Procedure: Dental implant insertion

Detailed Description:

The primary purpose of this study is the evaluation of the effects of the kidney transplant on the periimplant bone density by the comparison with the density of healthy patients. The secondary purpose is obtaining clinical, histological and radiographic data to evaluate the effect of systemic conditions and its rebound on the insertion of fixtures.

Evaluation criteria

  1. Control group: evaluation of the periimplant bone density (1 mm) next to the implant virtually planned using the CT editing software on the cone beam CT acquired in a retrospective sample of patients already treated with the insertion of a fixture in the molar or premolar edentulous site
  2. Test group: periodontal evaluation with plaque index, bleeding on probing index and probing 1 month before operation.
  3. Test group: evaluation of periimplant bone density (1 mm) in the fixture virtual-projected zone (the implant will be inserted there) with the CT acquisition and editing software.
  4. Test group: evaluation of the implant stability after their insertion (primary stability) using the Resonance Frequence Analysis. ISQ (Implant Stability Quotient) value is expressed in 4 numbers (mesial, distal, buccal, lingual), average values of three measures acquired in each side.
  5. Test group: evaluation of the implant stability immediately after the insertion calculating the insertional torque value (ITV) with an implant motor.
  6. Test group: evaluation of the periimplant bone using an endoral periapical radiograph with Rinn device immediately after the operation.
  7. Test group: histomorphological examination of the bone core sample made by a trephine resulted from the implant site preparation

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Study Type : Observational
Estimated Enrollment : 26 participants
Observational Model: Case Control
Time Perspective: Prospective
Official Title: Peri-Implant Bone Assessment in Transplanted Patients: A Case Control Study
Study Start Date : May 2014
Estimated Primary Completion Date : May 2020
Estimated Study Completion Date : August 2022

Resource links provided by the National Library of Medicine

Group/Cohort Intervention/treatment
TEST group (kidney transplanted)

Kidney transplanted patients, passed through dialysis phase presenting a mandibular edentulism. It will be scheduled one or two dental implants to be inserted in mandible.

This group will be subjected to a dental implant insertion procedure.

Procedure: Dental implant insertion
Dental implant insertion will be carry out in the mandible of the patients enrolled, through a surgical template in order to repeat the same position of the simulating implant insertion. After a trephine bur passage, the final two or three twist-drills will be used to realize the implant socket. After implant positioning, a cover screw will be tightened and the mucosa sutured above.

CONTROL group (healthy patients)
Healthy patients, with an inserted mandibular implant, retrospectively enrolled with a preoperative cbct scan.

Primary Outcome Measures :
  1. Bone density measured in Grey Value [ Time Frame: seven days after cone beam computed tomography ]
    bone density will be assessed on the cone beam CT scans with the virtual implant positioning before surgery (for the test group) and postoperatively (retrospectively assessed) for the control group. Grey Value will be assessed in the area of 1 mm around the shape of the implants.

Secondary Outcome Measures :
  1. Insertional torque value [ Time Frame: during implant placement ]
    Only for the test group the Insertional torque value will be assessed during surgery.

  2. Histomorphometric analysis [ Time Frame: within 20 days after implant placement ]
    Only for the test group the microscopic analysis will be performed on the specimen harvested during surgery (via trephine bur, preparing the implant site)

Biospecimen Retention:   Samples With DNA
bone specimen harvested during implant site preparation in order to obtain usefull samples for hystomorphometrical analysis

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Probability Sample
Study Population

The minimal number of the participants of this study is 26 per group: this results from the measure of a 0,8 effect size. If the effect size is less than 1 (minimal value), it represents the situation where the medium difference of standard deviations of the variable "bone density" is equivalent to the difference of the value between the two groups of the study.

Subject of test group will be enrolled an a kidney transplanted patients, while Subjects of control group will be enrolled retrospectively in healthy patients


Inclusion Criteria:

  • Diagnosis: single or partial mandibular molar-premolar edentulism that requires up to 2 fixtures
  • Good systemic compensation of the kidney transplant (≤ ASA American Society of Anesthesiologists score 3) with at least 1 year of previous hemodialysis or peritoneal dialysis and in actual immunosuppressive therapy
  • Be older than 18 years
  • The patient must be able to understand the meaning of the study and accept to undergo periodical follow-up controls.
  • The patient must be able to understand and practice all the oral hygiene procedures demanded by the experimenter
  • Signature of the informed consent form

and for control

  • Diagnosis: single or partial mandibular molar-premolar edentulism that requires up to 2 fixtures
  • Having a pre-operatory cone beam CT available
  • Age older than 18 years
  • Signature of the authorization to use and process personal details at the acceptance of every sort of treatment in the Company Hospital of Trieste.

Exclusion Criteria:

  • Post extraction implant (before 3 months from the extraction)
  • Be less than 18 years old
  • Smoking more than 10 cigarettes/day
  • Plaque index more than 25
  • Bleeding on probe index more than 25
  • Clear allergy or intolerance against the products used in the study
  • Patients that require reconstructive bone surgery before the fixtures placement (gbr and bone grafting)

and for control group

  • Patients that require reconstructive bone surgery before the fixtures placement (gbr and bone grafting)
  • Pathologies and pharmacological therapies that interfere with bone (for instance osteoporosis, osteomalacia, malnutrition, Paget's disease, corticosteroid therapy, bisphosphonate therapy, head and neck radiotherapy)

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 identifier (NCT number): NCT02513602

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Contact: Federico Berton, DDS 0403992254 ext 0039

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University Hospital Company, "Ospadale Maggiore" Recruiting
Trieste, TS, Italy, 34100
Contact: Federico Berton, DDS    0403992254 ext 0039   
Contact: Gaetano Castronovo, MS, Msc    0403992254 ext 0039   
Sponsors and Collaborators
University of Trieste
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Study Director: Roberto Di Lenarda, DDS, MSc University of Trieste Medical School, Department of Odontology and Stomatology

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Responsible Party: prof. Roberto Di Lenarda, Professor, University of Trieste Identifier: NCT02513602     History of Changes
Other Study ID Numbers: ITR
First Posted: July 31, 2015    Key Record Dates
Last Update Posted: November 2, 2016
Last Verified: November 2016

Keywords provided by prof. Roberto Di Lenarda, University of Trieste:
renal disease
tooth loss

Additional relevant MeSH terms:
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Tooth Loss
Periodontal Diseases
Mouth Diseases
Stomatognathic Diseases
Tooth Diseases