Skip to main content
OpenTrials
Completed

NCT Number: NCT07140887

Autogenous Bone Ring Versus Split Bone Block for Management of Posterior Atrophic Mandible

Teeth loss in the posterior mandible initiates residual ridge resorption especially in vertical direction, this causes difficulty in implant placement so ridge augmentation must be done either simultaneous with implant placement or in a staged approach Aim: To evaluate the effect of bone ring technique versus split bone block technique with simultaneous implant clinically on primary and secondary

Completed

Looking for future studies?

Notify Me

Key information

Conditions

Ridge Augmentation

Age range

35 year–50 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Outpatient Clinic of Oral and Maxillofacial Surgery Department, Faculty of Dentistry, Alexandria University, Egypt

Alexandria, Azarita, 00203, Egypt

Who can participate

Healthy volunteers accepted: No

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

Inclusion criteria

  • Patients with missing posterior mandibular teeth.
  • Vertical bone defect from 3 to 4 mm.
  • Adequate zone of keratinized tissue.

Exclusion criteria

  • Presence of infection or periapical lesions in adjacent teeth.
  • Medically compromised patients with a condition that affects the procedure.
  • Insufficient inter-arch distance.
  • Bruxism or clenching.
  • Alcoholism.
  • Heavy Smokers.

Treatment and study plan

Bone Ring

Other

Patients in this group will be treated with the bone ring technique. An implant drill will be used next to prepare central osteotomies corresponding to the final implant diameter to be placed in the center of the disc converting it to a "bone ring".

Split Bone block

Other

Patients of this group will be treated with split bone block with simultaneous implant technique. The bone shell will be split into two bone shells each 1 ~ 2 mm in thickness using a disc.

Primary outcomes

  1. Change in implant stability

    Time frame: Immediate and 6 months

    Implant stability will be recorded immediately after placement (1ry stability) and after 6 months (2ry stability ) by using osstell device. The result is presented in form of ISQ value from 1to 100, the higher the ISQ the higher the stability of implant(

  2. Change in pain scores

    Time frame: up to 7 days

    Pain will be assessed for 7 days postoperatively using 10-point visual analouge scale (VAS) (0-1=None, 2-4=mild, 5-7=moderate, 8-10=severe ).

  3. Change in marginal bone level

    Time frame: 6 and 9 months

    At buccal, lingual, mesial, and distal sites will be evaluated radiographically from the shoulder of the implant to the alveolar crest.

Secondary outcomes

  1. Change in bone density

    Time frame: 6 months

    Will be measured at 6 points around the implant and a mean value will be calculated using CBCT

  2. Change in edema

    Time frame: up to 7 days

    Measured as follows:

    No inflammation = none. Intra oral swelling confined to the surgical field = mild. Extra oral swelling in the surgical zone =moderate. Extra oral swelling spreading beyond the surgical zone =intense.

Sponsors and collaborators

Lead sponsor

Alexandria University

Other

Registry information

Official study title

Autogenous Bone Ring Versus Split Bone Block With Simultaneous Implant Placement for Management of Posterior Atrophic Mandible (A Randomized Clinical Trial)

Important dates

Study start
2024
Primary completion
2025
Study completion
2025
First posted
Aug 26, 2025
Registry last updated
Aug 26, 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.

Related clinical trials

Published trials that share one or more normalized conditions with this study.