Efficacy of Transoral Versus Transbuccal Technique for Fixation of Mandibular Angle Fracture

OBJECTIVE: To compare the efficacy of transoral versus transbuccal technique for fixation of mandibular angle fracture in terms of mouth opening and radiographic gap and displacement.

OPERATIONAL DEFINITIONS:

MANDIBLE ANGLE FRACTURE:Fracture line in area bound from the anterior border of the masetter(distal of 2nd molar) to posterior border of the masetter assessed clinically through palpation and radiographically through OPG and PA mandible.

EFFICACY: The efficacy of the two procedures will be assessed on 1 week, 1 month, 3 months with following outcomes.

1. MOUTH OPENING: Mouth opening will be defined as maximum interincisal distance measured in millimeters through ruler.
2. GAP BETWEEN FRACTURE SEGMENTS: Gap between proximal and distal fracture lines measured in millimeters in OPG with ruler.
3. DISPLACEMENT OF FRACTURE SEGMENTS: Presence of step between distal and proximal segments in vertical plane at the lower border on OPG.

HYPOTHESIS: Transbuccal approach will have better functional post-operative mouth opening, radiographic gap and displacement compared to transoral fixation technique in patients with mandibular angle fracture.

MATERIALS AND METHODS:

STUDY DESIGN: Prospective randomized clinical study. SETTING:Oral and maxillofacial surgery department, emergency and OPD of Services Hospital Lahore.

DURATION OF STUDY: Six months after approval of synopsis. SAMPLE SIZE: Sample size was calculated through openepi calculator for sample size for % frequency in a population(random sample) Population size=1000000 Anticipated % frequency(p)=50 Confidence limits=12% absolute precision Design effect=1.0 for random sample Sample size for 95% confidence level=67 Sample size in each group=n=34

SAMPLING TECHNIQUE: Nonprobability purposive sampling technique.

SAMPLE SELECTION:

DATA COLLECTION PROCEDURE:

METHODS OF DATA COLLECTION:Patients fulfilling inclusion criteria will be taken from emergency and OPD of Services Hospital Lahore and will be randomized into 2 groups group A( transoral technique) and group B (transbuccal technique) by lottery method after taking informed consent from them by briefing them about study, research protocol and risk-benefit ratio.Diagnosis and treatment plan will be made based on history, clinical examination and radiographic findings of OPG and PA mandible. Procedure will be done by single surgical team. In Group A transoral approach inferior alveolar nerve block and buccal nerve block will be given by 2% xylocaine with 1:100000 adrenaline. Incision will be made with surgical blade no 15 from gingival crevices of molars to ascending ramus. Fracture segments will be reduced alongwith MMF. A 5-hole 2mm miniplate with 2 holes anterior and 2 holes posterior to fracture line will be screwed to external oblique ridge and MMF will be removed and incision line will be closed. In Group B tranbuccal technique same procedure will be performed till fracture reduction and MMF after which extraorally a stab incision will be made with scalpel blade parallel to relaxed resting skin tension lines through which the cannula with a trocar will be inserted through facial tissue down to bone. Transbuccal instrument system will cionsist of transbuccal guide, mountable retractor, drill sleeve, drill guide, and 2mm drill bit. A 2mm titanium miniplate will be placed along buccal cortex and screwed through trocar system. MMF will be removed and incision line closed.

DATA COLLECTION TOOLS:All study variables will be assessed by single person at 1 week,1 month and 3 months post op.Clinical parameters will be assessed through proforma/questionnaire. Radiological parameters will be assessed through OPG, PA mandible.

DATA ANALYSIS PROCEDURE:Data will be collected and statistically analyzed using the SPSS software version 29. Mean and standard deviation will be calculated for quantitative variables like age, etiology, associated fractures, clinical and radiological parameters. Frequency and percentage will be measured for qualitative measures like gender, site. Efficacy between both groups will be compared by t-test and a P value of less than or equal to 0.05 will be considered statistically significant.