study hypothesis 1. The aim of this study: How can the investigators predict and control the nasal changes after maxillary LeFort I osteotomy with 2 different alar base suture techniques ? 2. Study hypothesis * Null hypothesis: Nasal changes were not affected by 2 different alar base suture techniques after maxillary LeFort I osteotomy * Alternative : Nasal changes were affected by 2 different alar base suture techniques after maxillary LeFort I osteotomy
Background and study purpose: Patients who received maxillary LeFort I osteotomy often complained about their nose become wider and more nostril show after surgery. According the the literature review, the conventional and modified alar base cinch technique both could control the interalar width. However, there is no long term result show which technique is superior to the other. Therefore, in order to improve patients' nasal and midfacial esthetics after the surgery, this study is to evaluate how the nasal changes affected by 2 different alar base cinch suture and which technique could result in a more positive effect.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Enrollment
48
The conventional suture began from the bilateral alar part of the nasalis muscle and passed through a hole drilled on the anterior nasal spine.
The modified suture began from the bilateral alar part of the nasalis muscle and dermis tissue over the alar base, and then passed through a hole drilled on the anterior nasal spine.
Chang Gung memorial hospital
Taipei, Taiwan, Taiwan
Soft and Hard Tissue Landmarks Movement
The investigator measured the movement (1 month minus baseline) of hard tissue landmarks before and after 4-6 weeks maxillary LeFort I osteotomy. The movement (6 months minus baseline) of soft tissue landmarks was measured before and after 6 months of the maxillary LeFort I osteotomy. The 3D directional movement of each point was measured in the x(transverse), y(vertical), and z (antero-posterior)planes. The positive directional movement of each point in X axis means the point moved left after surgery, and negative directional movement in X axis means the the point moved right after surgery. The positive directional movement in Y axis means the point moved upward after surgery, and negative directional movement in Y axis means the the point moved downward after surgery. The positive directional movement in Z axis means the point moved anteriorly after surgery, and negative directional movement in Z axis means the the point moved posteriorly after surgery.
Time frame: The hard tissue movements were assessed after surgery 4-6 weeks.The soft tissue movements were assessed after surgery 6 months.
14 Nasolabial Linear Parameters
1. baseline characteristics: intercanthulus distance 2. nasal linear parameters 3. nasolabial linear parameters
Time frame: up to post-operation 6 months
1 Nasolabial Angular Parameters
2D nasolabial angular parameter: Nasolabial angle (NLA) (The NLA was a two dimensional measurement and was measured at the midsagittal plane with Image J software®)
Time frame: up to post-operation 6 months
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