Is There a Correlation Between Milimetric Movement of Two Jaw and Nazolabial Angle Change after Orthognathic Surgery in CLASS III Patients

IS THERE A CORRELATION BETWEEN MILIMETRIC MOVEMENT OF TWO JAW AND NAZOLABIAL ANGLE CHANGE  AFTER ORTHOGNATHIC SURGERY IN CLASS III PATIENTS

INTRODUCTION

Orthognathic surgery is an effective and popular treatment method in plastic surgery, which provides both functional and esthetic benefits. Therefore, the ability to predict postoperative changes in bone and soft tissue especially the nose is crucial ¹.The aim of this study is to examine if there is a correlation between movement quantity and nasolabial angle changes after two-jaw surgery. 

METHOD

19 patients ( 4men, 15 women) with Class III maloclusion who under went orthognathic surgery between 2010-2015 were included. Mean age was 21.8(18 -26).  2 only maksiller advancement. 3 only mandibular setback , 1 only mandibular advancement. 13 two-jaw surgery were applied.. Preoperative and postoperative measurements of nasolabial angles were done by photographic analysis. Maxillar and mandibular movement quantity and nasolabial angle change degree were compared.

RESULTS

Nasolabial angle was increased at 13 and decreased at 5 patients.

The mean nasolabia langle was 87° beforesurgery, and increased to 88.2° after surgery.

In one patient nasolabial angle  increased 12% after 2 mm maxillar advencement and 7 mm mandibular setback. In another patient nasolabial angle increased 1% after 3 mm maxillar advencement and 7 mm mandibular setback. Even, in one patient angle 

decreased 12% after 3 mm maxillar advencement, 4mm impaction and 5 mm mandibular setback  may be due to osteotomy line and soft tissue.

So,  there was no statistical correlation  between movement quantity and nasolabial angle changes. 

CONCLUSION

First efforts were made to quantify nasal soft tissue changes due to bony manipulations in 1970s.  However, it is diffucult to  guess soft tissue changes before surgery ².  

According to this study there is no definite correlation between  movement quantity and nasolabial angle changes may be due to soft tissue and osteotomy line.

So, it might be sensible  to do additional interventions at second stage operations.