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Completed

NCT Number: NCT01628367

Guided Bone Regeneration Around Immediate Implants

An important result of healing after tooth extraction is a reduction in dimensions of the remaining bone at that site. This reduction of bone volume precludes successful restoration of the space using a dental implant. Bone augmentation has shown promise in clinical reports to reduce this loss of bone volume, thus allowing implant placement and restoration. The purpose of this study is to evaluate the clinical and radiographic outcomes of guided bone regeneration around dental implants placed in fresh extraction sockets.

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Key information

Conditions

Missing Tooth Anodontia Congenital Abnormalities Congenital, Hereditary, and Neonatal Diseases and Abnormalities Stomatognathic Diseases Stomatognathic System Abnormalities Tooth Abnormalities Tooth Diseases

Age range

18 year–100 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 4

Primary location

Graduate Periodontics Dept of Periodontics and Oral Medicine University of Michigan - School of Dentistry 1011 N. University, Room 1324

Ann Arbor, Michigan, 48109, United States

About this study

Aim: The purpose of this clinical study is to investigate the effect of a non-resorbable polytetrafluoroethylene (PTFE) membrane on immediate implant placement in the esthetic zone.

Material and Methods: Systemically healthy subjects presenting with a hopeless tooth in the maxillary premolar or anterior region will be recruited in the study. Following a minimally traumatic tooth extraction, subjects will be randomly distributed into one of two treatment groups, a Membrane (Test) or a No Membrane (Control) group. Both groups will receive immediate placement of an implant along with placement of a bone graft material to fill the spaces around the implant. Sites in the test group will receive a non-resorbable PTFE membrane over the socket, whereas those in the control group will receive a collagen dressing over the socket. At sites in the test group, the membrane will be removed at 4 weeks. A second stage surgery and placement of a provisional restoration will be carried out 4 months after implant placement. Final restorations will be placed 3 months after placement of the provisional restoration. Clinical and radiographic measurements will be performed at baseline, implant placement, placement of provisional and final restorations and at the 5-month recall visit.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Males and females aged 18 or older.
  • Systemically healthy (American Society of Anesthesiologists I or II).
  • Subjects will have one or more anterior or premolar teeth with a hopeless prognosis, with adjacent and opposing teeth present.
  • Compliance with all requirements in the study and signing the informed consent

Exclusion criteria

  • Active acute infection at the extraction site (e.g., sinus tract, swelling)
  • Absence of sufficient mesio-distal width to place an implant as per the study protocol.
  • Absence of sufficient bone height to house a 10mm long implant.
  • The subject lacks a stable occlusion and/or a healthy periodontium.
  • Current smokers or quit smoking less than one year
  • Chronic use of medications known to affect the periodontal status (calcium antagonists, anticonvulsives, immunosuppressives, anti-inflammatory medications)
  • Pregnancy or lactating mothers
  • Current orthodontic or periodontal treatments
  • History of alcoholism or drug abuse
  • Untreated deep carious lesions or defective restorations that can potentially exacerbate during the course of the study
  • Diseases of the immune system or any medical condition that may influence the outcome (uncontrolled diabetes (HbA1c >7)
  • Bone disorders (hyperparathyroidism, osteoporosis, or Paget's disease)
  • Neurologic or psychiatric disorders, systemic infections
  • A history of IV bisphosphonate use.

Treatment and study plan

Minimally Traumatic Tooth Extraction

Procedure

The surgeon will perform a minimally traumatic tooth extraction in the following fashion. Intrasulcular incisions will be performed with at 15-C scalpel around the tooth to be extracted.

A periotome will then be introduced into the periodontal ligament space in order to sever the subcrestal attachment and expand the periodontal ligament space. Elevators will be used to initiate luxation of teeth. After significant mobility has been achieved through elevation, forceps will be used only to deliver the tooth. Finally, the socket will be curetted to remove all granulomatous tissue and irrigated with sterile isotonic saline solution.

immediate implant placement

Device

A threaded titanium alloy implant with an internal hex connection and a Resorbable Blast Texturing (RBT) surface (Tapered Internal® Implant System, Biohorizons, Inc., Birmingham, AL, USA) will be placed using a surgical guide. Implant diameter of 3.8mm with lengths of either 12 or 15mm will be used. Implants will be placed approximately 3-4mm below the free gingival margin or 2-3mm below the cemento-enamel junction of adjacent teeth.

Bone Graft Placement

Biological

Circumferential defects or dehiscences around the immediately placed implant will be grafted. enCore™ Combination Allograft (Osteogenics Biomedical, Lubbock, Texas, USA) will be used as the bone graft material.

Membrane placement

Biological

A non absorbable d-PTFE membrane (Cytoplast® TXT-200, Osteogenics Biomedical, Lubbock, Texas, USA) will be trimmed to an appropriate size and shape to completely cover the implant site, and extend about 3-5mm beyond on the facial aspect. The membrane will be tucked under the sub-periosteal flap. Care will be taken to ensure that the membrane is resting on bone all around the socket margins. The membrane will be kept a minimum of 1.5mm from the adjacent tooth roots in the interdental area.

Collagen plug placement

Biological

A bio-absorbable collagen wound dressing (CollaPlug®, Zimmer Dental, Carlsbad, CA, USA) will be trimmed to the appropriate size, so as to cover the socket

Medications

Drug

Patients will be given amoxicillin 500mg 2 days prior to the surgery and will then continue for every 8 hours for 10 days. Patients will also take Ibuprofen 600mg every 6 hours for the first 3 days following the surgery, and then as needed for pain. Patients will also receive a prescription for Vicodin as needed for pain, every 4 to 6 hours

Primary outcomes

  1. Change in Thickness of Buccal Bone

    Time frame: One year

    Change of buccal bone volume over study duration

Secondary outcomes

  1. Change in Interproximal Bone Levels

    Time frame: One year

    Change of interproximal marginal bone loss (mean of mesial and distal sites)

  2. Pink Esthetic Score

    Time frame: One year

    Pink esthetic score per Furhauser et.al. measured at study conclusion where based on seven variables: mesial papilla, distal papilla, soft-tissue level, soft-tissue contour, alveolar process deficiency, soft-tissue color and texture (Fig. 1). Each variable was assessed with a 2-1-0 score, with 2 being the best and 0 being the poorest score. Thus a maximum score of 14 is best, and 0 is the worst.

Sponsors and collaborators

Lead sponsor

University of Michigan

Other

Registry information

Official study title

The Effectiveness of the Cytoplast Technique in Preventing Bone Loss Around Immediate Implant Placement in the Esthetic Zone. A Randomized Clinical Trial.

Important dates

Study start
2012
Primary completion
2014
Study completion
2014
First posted
Jun 26, 2012
Registry last updated
Mar 20, 2017

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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