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Objectives <p>Successful orthognathic therapies are characterised by a&#xa0;physiologically configured occlusion whose long-term clinical stability is mainly assessed through occlusal parameters. In the present study, long-term treatment outcomes were assessed based on occlusal changes after 5&#xa0;years using digital occlusion and masticatory efficiency analysis.</p> Methods <p>This study examined 33&#xa0;adult patients after treatment of skeletal class&#xa0;II (<i>n</i> = 18; 12&#xa0;women, median age 28.15 years; interquartile range [IQR] = 15.10) and class&#xa0;III malformations (<i>n</i> = 15; 7&#xa0;women, median age 23.90 years; IQR = 4.80) 9&#xa0;months (T1) and 5&#xa0;years (T2) postorthognathic therapy. A total of 20&#xa0;patients with neutral skeletal relation (10&#xa0;women; median age 30.50 years; IQR = 7.50) served as a&#xa0;control group. Skeletal classification was based on sagittal jaw configuration (Wits) and habitual intercuspation was recorded using the T‑Scan Novus® (Tekscan Inc., South Boston, MA, USA) for digital occlusion analysis with the following variables: total tooth contact (TTC), occlusion time (TOC), occlusion asymmetry (OAS), anterior and posterior antagonism (ATC and PTC). In addition, masticatory performance was assessed using a&#xa0;standardized two-colour chewing gum bolus analysis.</p> Results <p>Five years after surgery (T2), none of the occlusal parameters differed significantly between the groups, indicating functional approximation to the control group. Longitudinal analysis revealed significant improvements within both surgical groups (T1 to T2). In class&#xa0;II patients, TTC, ATC and PTC increased, while TOC decreased significantly. Class&#xa0;III patients also showed significant increases in TTC, ATC and PTC with TOC and OAS remaining unchanged. Overall, both treatment groups demonstrated substantial recovery and long-term stabilization of occlusal function. Bolus homogeneity analysis showed no significant difference between control and treatment patients 5&#xa0;years after surgery.</p> Conclusion <p>The 5‑year observation of orthognathic treatment for sagittal jaw malformations showed significant improvements in occlusal parameters. Both masticatory efficiency and occlusal parameters measured at 5&#xa0;years postoperatively did not differ significantly from the control group, indicating that the functional improvements achieved by the therapy were stable in the long term.</p>

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Five-year stability of occlusal function in orthognathic patients with sagittal malocclusions

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月1日

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  • Lisa-Marie Mai,
  • Jeremy Mouchoux,
  • Philipp Meyer-Marcotty,
  • Anja Quast,
  • Phillipp Brockmeyer,
  • Henning Schliephake,
  • Bernhard Wiechens

摘要

Objectives

Successful orthognathic therapies are characterised by a physiologically configured occlusion whose long-term clinical stability is mainly assessed through occlusal parameters. In the present study, long-term treatment outcomes were assessed based on occlusal changes after 5 years using digital occlusion and masticatory efficiency analysis.

Methods

This study examined 33 adult patients after treatment of skeletal class II (n = 18; 12 women, median age 28.15 years; interquartile range [IQR] = 15.10) and class III malformations (n = 15; 7 women, median age 23.90 years; IQR = 4.80) 9 months (T1) and 5 years (T2) postorthognathic therapy. A total of 20 patients with neutral skeletal relation (10 women; median age 30.50 years; IQR = 7.50) served as a control group. Skeletal classification was based on sagittal jaw configuration (Wits) and habitual intercuspation was recorded using the T‑Scan Novus® (Tekscan Inc., South Boston, MA, USA) for digital occlusion analysis with the following variables: total tooth contact (TTC), occlusion time (TOC), occlusion asymmetry (OAS), anterior and posterior antagonism (ATC and PTC). In addition, masticatory performance was assessed using a standardized two-colour chewing gum bolus analysis.

Results

Five years after surgery (T2), none of the occlusal parameters differed significantly between the groups, indicating functional approximation to the control group. Longitudinal analysis revealed significant improvements within both surgical groups (T1 to T2). In class II patients, TTC, ATC and PTC increased, while TOC decreased significantly. Class III patients also showed significant increases in TTC, ATC and PTC with TOC and OAS remaining unchanged. Overall, both treatment groups demonstrated substantial recovery and long-term stabilization of occlusal function. Bolus homogeneity analysis showed no significant difference between control and treatment patients 5 years after surgery.

Conclusion

The 5‑year observation of orthognathic treatment for sagittal jaw malformations showed significant improvements in occlusal parameters. Both masticatory efficiency and occlusal parameters measured at 5 years postoperatively did not differ significantly from the control group, indicating that the functional improvements achieved by the therapy were stable in the long term.