Stability of fixation methods in large mandibular advancements after sagittal split ramus osteotomy: an in vitro biomechanical study.
Br J Oral Maxillofac Surg
; 59(4): 466-471, 2021 05.
Article
in En
| MEDLINE
| ID: mdl-33468331
ABSTRACT
Sagittal split ramus osteotomy (SSRO) with large mandibular advancements is a common surgical procedure and could be indicated for patients with sleep apnoea. As a large variety of fixation methods is used for the stabilisation of SSRO, a biomechanical test model was used to analyse which fixation technique was most stable. For this in vitro study, 80 polyurethane hemimandibles with a prefabricated SSRO were used as substrates. Loads in Newtons were recorded at displacements of the mandibular incisive edge at 1mm, 3mm and 5mm. The samples were divided into two groups mandibular advancements of 10mm and 15mm. In both groups, four fixation techniques were used (A) one four-hole miniplate; (B) two four-hole miniplates; (C) one four-hole miniplate plus one bicortical screw; and (D) three bicortical screws in an inverted-L arrangement. In group 1, three bicortical screws resulted in the best stability, and in group 2, two miniplates resulted in the best stability. The use of two miniplates did not show significant differences between both groups. Other fixation methods showed more stability with 10mm advancements. This study therefore suggests that in SSRO with advancements exceeding 10mm, the use of two miniplates is the optimal means of providing rigid fixation.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Mandibular Advancement
/
Osteotomy, Sagittal Split Ramus
Limits:
Humans
Language:
En
Journal:
Br J Oral Maxillofac Surg
Year:
2021
Document type:
Article