Articles Vol. 64 No. 3 24/04/2023

11. ASSESSMENT OF THE RESULTS OF CHANGE IN THE PAR INDEX (PEER ASSESSMENT RATE) AFTER TREATMENT OF CLASS II ANGLE MALOCCLUSION WITH MBT BRACKET SYSTEM AT THE DEPARTMENT OF ODONTO-STOMATOLOGY CAN THO UNIVERSITY OF MEDICINE AND PHARMACY

Le Nguyen Lam1,2, Nguyen Thuy Xuan1,2
1 Can Tho University of Medicine and Pharmacy
2 Trường Đại học Y Dược Cần Thơ
Corresponding author: lenguyenlam@ctump.edu.vn
DOI: 10.52163/yhc.v64i3.645
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Keywords
PAR index, Class II Angle Malocclusion.
Abstract

Background: Analysis to evaluate occlusal changes is very important in assessing orthopedic
treatment outcomes. There are many analytical methods based on measurements on plaster samples
before and after treatment, such as measuring the distance between teeth and width of jaw arch or
based on an occlusal index such as ICON, PAR index.
Objectives: Evaluation of the change in PAR index (peer assessment rate) after treatment of Class II
Angle malocclusion with the MBT bracket system at the Department of Odonto-Stomatology, Can
Tho University of Medicine and Pharmacy.
Materials and methods: The study was conducted on 31 patients with Class II Angle malocclusion
at the Department of Odonto-Stomatology, Can Tho University of Medicine and Pharmacy. The
patients were treated for orthodontic treatment of Class II Angle malocclusion. Evaluation of
treatment results according to PAR. Degree of change = PAR before treatment - PAR after treatment
Result: The PAR index (W) before treatment was 32.19 ± 13.84. Among the components of the
PAR index (W), overbite has the highest score of 11.16 ± 8.12, and overbite has the lowest score of
2.00 ± 1.55. The index that changed the most was the overbite, reduced by 10.65 points, improved
by 93.67% after treatment, and the crowding in the posterior teeth decreased by at least 0.65 points,
improved by 40.89%.
Conclusion: In the of PAR(W) after treatment, the occlusal components all had a great change
after treatment, there was no component in the coefficient that did not improve, indicating that the
occlusion is very well improved, good guarantee in terms of functionality and stability.

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