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NCT Number: NCT07171879

Pontic Shield and Mineralized Plasmatic Matrix for Ridge Preservation

This study is testing new methods to preserve the jawbone and gum tissue after removing a damaged front tooth. Normally, when a tooth is taken out, the bone and gums in that area shrink, which can make future dental treatment more difficult and affect appearance. A technique called Partial Extraction Therapy (Pontic Shield Technique) keeps part of the tooth root in place to help maintain the natural shape of the bone and gums. Another method, called Mineralized Plasmatic Matrix (MPM), uses a patient's own blood mixed with bone particles to support healing.

In this randomized clinical trial, 56 patients were assigned to one of four groups:

Group I: Tooth extraction only Group II: Tooth extraction with MPM grafting Group III: Pontic shield technique alone Group IV: Pontic shield technique with MPM grafting The main outcome measured was the amount of bone width preserved, using 3D X-rays (CBCT). Other outcomes included bone height and soft-tissue healing over 4 months.

This research will help determine whether the pontic shield technique, with or without MPM, provides better preservation of bone and gum tissue compared to tooth extraction alone.

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Key information

Conditions

Alveolar Ridge Preservation

Age range

18 year–65 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Faculty of Dentistry, Mansoura University

Al Mansurah, Dakahlia Governorate, 35511, Egypt

Who can participate

Healthy volunteers accepted: No

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

Inclusion criteria

  • Adults (≥18 years).
  • Classified as ASA I (healthy) according to the American Society of Anesthesiologists Physical Status Classification.
  • Presence of Type 1 extraction sockets (intact buccal bone and soft tissues).
  • Adequate oral hygiene.
  • Sufficient inter-arch space for prosthetic rehabilitation.
  • Willingness to comply with study protocol and follow-up schedule.

Exclusion criteria

  • Systemic conditions affecting bone metabolism or wound healing (e.g., uncontrolled diabetes, osteoporosis, immunosuppression).
  • History of head and neck radiotherapy or bisphosphonate therapy.
  • Acute infection or suppuration at the extraction site.
  • Severe periodontal disease.
  • Root caries or tooth mobility.
  • Buccal bone plate loss due to vertical/horizontal root fractures or advanced periodontitis.

Treatment and study plan

Tooth Extraction only

Procedure

Conventional atraumatic extraction of the non-restorable maxillary tooth in the esthetic zone without socket preservation procedures.

Extraction + MPM

Procedure

Tooth extraction followed by socket grafting using MPM, prepared from autologous blood combined with xenograft bone particles.

Pontic Shield Only

Procedure

Partial extraction therapy using the pontic shield technique, in which the buccal root fragment is preserved to maintain ridge contour, without additional grafting.

Pontic Shield + MPM

Procedure

Pontic shield technique combined with grafting using mineralized plasmatic matrix (MPM) for enhanced ridge preservation and healing.

Primary outcomes

  1. Alveolar Ridge Width Change

    Time frame: Baseline (pre- or immediate post-extraction) to 4 months.

    Mean changes in alveolar ridge width measured at standardized reference points on cone-beam computed tomography (CBCT) Unit of Measure: millimeters (mm)

Secondary outcomes

  1. Buccal and Palatal Bone Height Change

    Time frame: Baseline to 4 months.

    Change in buccal and palatal bone heights measured on CBCT from baseline to 4 months.

    Unit of Measure: mm

  2. Soft-Tissue Healing (Wound Healing Index, WHI)

    Time frame: 1 week and 4 months post-extraction.

    Clinical soft-tissue healing evaluated using the WHI. Unit of Measure: score on 5-point scale with higher values indicating more favorable wound healing.

Sponsors and collaborators

Lead sponsor

Soaad Tolba Mohammed Tolba Badawi

Other

Registry information

Official study title

Partial Extraction Therapy for Facial Contour Preservation, "Old is Gold or Time for Change?" A Randomized Clinical Trial

Acronym: PONTIC-MPM

Important dates

Study start
2024
Primary completion
2025
Study completion
2025
First posted
Sep 15, 2025
Registry last updated
Sep 17, 2025

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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