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

NCT07140887 | Completed DMC

• 1 other identifier: 0917-05/2024
• Study Type: interventional
• Target: 16
• Locations: 1 country
• Sites: 1

Brief Summary

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

Conditions

Ridge Augmentation

Keywords

Bone ring, trephine, piezotome, ridge augmentation, Khoury technique, implant

Outcome Measures

Primary Outcomes (3)

• Change in implant stability

  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(

  Immediate and 6 months

• Change in pain scores

  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 ).

  up to 7 days

• Change in marginal bone level

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

  6 and 9 months

Secondary Outcomes (2)

• Change in bone density

  6 months

• Change in edema

  up to 7 days

Study Arms (2)

Bone ring technique

EXPERIMENTAL

Other: Bone Ring

Split bone block technique

ACTIVE COMPARATOR

Other: Split Bone block

Interventions

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".

Bone ring technique

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.

Split bone block technique

Eligibility Criteria

• Age: 35 Years - 50 Years
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64)

You may qualify if:

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

You may not qualify if:

• 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.

Sponsors & Collaborators

• Alexandria University: lead

Study Sites (1)

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

Alexandria, Azarita, 00203, Egypt

Location

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: SINGLE
• Who Masked: PARTICIPANT
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: August 21, 2025
• First Posted: August 26, 2025
• Study Start: August 26, 2024
• Primary Completion: August 5, 2025
• Study Completion: August 5, 2025
• Last Updated: August 26, 2025

Record last verified: 2025-08

Locations

EG (1)