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. 2022 Jun;21(2):469-480.
doi: 10.1007/s12663-020-01445-5. Epub 2020 Aug 31.

Long-Term Study of Relapse After Mandibular Orthognathic Surgery: Advancement Versus Setback

N K Sahoo  1 , Shiv Shankar Agarwal  2 , Sanjeev Datana  2 , S K Bhandari  1
Affiliations

Long-Term Study of Relapse After Mandibular Orthognathic Surgery: Advancement Versus Setback

N K Sahoo et al. J Maxillofac Oral Surg. 2022 Jun.

Abstract

Background: Relapse is a continuing process and should be evaluated on a long rather than short term.

Materials and methods: Treatment records of 46 patients who underwent mandibular orthognathic surgery were divided into two groups, i.e. Group 1: Mandibular Advancement (MA) surgery (n = 26) and Group 2: Mandibular Setback (MS) surgery (n = 20). Lateral cephalograms were traced at T0 (01 week before surgery), T1 (01 week after surgery), T2 (01 year after surgery) and T3 (minimum 05 years after surgery) to study short- and long-term skeletal and dental relapse in horizontal, vertical and angular parameters selected for the study. Relapse was correlated with gender, age, amount of surgical movement and intra-operative change in mandibular plane angle to study effect of these factors on relapse.

Results: All horizontal, vertical and angular parameters studied showed significant relapse at short term (from T1 to T2) which continued significantly till long-term evaluation (T2 to T3) in both groups (P value < 0.001). Horizontal relapse in all parameters, vertical relapse in all parameters (except Pog and overbite at T1-T2) and angular relapse in all parameters (except Ramus inclination at T1-T2) was significantly higher in Group 2 compared to Group 1 (P value < 0.001 for all). Relapse showed significant and positive correlation with amount of surgical movement and intra-operative change in mandibular plane angle in both groups (P value < 0.05 for all).

Conclusion: Both MA and MS surgeries show significant relapse on both short- and long-term evaluation which it is higher in MS as compared to MA surgeries.

Keywords: Advancement surgery; Long-term relapse; Mandibular orthognathic surgery; Setback surgery.

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Conflict of interest statement

Conflict of interestThe authors declare that they have no conflict of interest.

Figures

Fig. 1
Fig. 1
Landmarks measured on lateral cephalogram
Fig. 2
Fig. 2
Short- and long-term relapse in horizontal parameters studied in Group 1
Fig. 3
Fig. 3
Short- and long-term relapse in vertical parameters studied in Group 1
Fig. 4
Fig. 4
Short- and long-term relapse in angular parameters studied in Group 1
Fig. 5
Fig. 5
Short- and long-term relapse in horizontal parameters studied in Group 2
Fig. 6
Fig. 6
Short- and long-term relapse in vertical parameters studied in Group 2
Fig. 7
Fig. 7
Short- and long-term relapse in angular parameters studied in Group 2
See this image and copyright information in PMC

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