Study of bone density evaluation by using cone beam computed tomography after novel modification of Low Z plasty technique in sagittal split osteotomy

Name: Passorn Nuntapolchai

keyword: BSSO with NM-Low Z plasty technique

; Bone healing

; Cone beam compute tomography

Abstract: Background and Objectives: This study aimed to assess the pattern and quantity of bone regeneration after mandibular setback surgery using a novel modification of the low Z plasty (NM-Low Z plasty) technique by measuring bone density (Hounsfield unit) at the osteotomy site over a 12-month postoperative period using cone-beam computed tomography (CBCT). Materials and Methods: This retrospective cohort study included six patients with skeletal Class III deformity who underwent bilateral sagittal split osteotomy (BSSO) setback using the NM-Low Z plasty technique between 2021 and 2023 at Thammasat University Hospital. CBCT images were obtained preoperatively and at 1 month, 6 months, and 12 months postoperatively. Bone density at the buccal, cancellous, and lingual aspects of the osteotomy gap was measured using Blue Sky Plan 4 software. The intraclass correlation coefficient was used to determine reliability. Descriptive statistics, repeated-measures analysis of variance and multiple linear regression analysis were performed for comparisons. Results: At 12 months postoperatively, bone density in all measured regions was not significantly different compared to the preoperative measurements, indicating sufficient bone regeneration. The cancellous and lingual cortical regions exhibited earlier recovery than the buccal cortex. No postoperative complications such as wound infection, delayed union, or nonunion were reported. Conclusions: BSSO using the NM-Low Z plasty technique offers reliable bone healing out-comes with stable bone regeneration, thereby providing a viable alternative to conventional BSSO techniques. Radiographic evidence confirmed its clinical applicability and potential to reduce the incidence of postoperative complications.

Thammasat University. Thammasat University Library

Address: BANGKOK

Email: preserv@tu.ac.th

Name: Narissaporn Chaiprakit

Role: advisor

Name: Chanekrid Oupadissakoon

Role: co-advisor

Name: Siripatra Pachanee

Role: co-advisor

Created: 2025

Modified: 2026-05-06

Issued: 2026-05-06

วิทยานิพนธ์/Thesis

application/pdf

DOI: 10.14457/TU.the.2025.248

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Oral and Maxillofacial Surgery

Grantor: Thammasat University

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