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Introduction to Orthodontics (15.10.2023).pdf
1.
Introduction to Orthodontics
(by Nay Aung, BDS, PhD) ááœá±á¬áœá¬ážááŸááá¯áááŸá¯á áá°áá¬áááœá±á á²á· áá¯ááºáááºááœá±ááºááááºááŸáᯠááŸáá¯ááŸáá¯ááŸááá±ááŒááºáœá¬ážá á¡á±á¬áœá¬ážá¡á±á¬ á±á¬áœá¬ážáá¬ááœá±áẠááœá±á¬áœá¬ážá á¬áœá¬ážááŸáᯠááŸáááŸáááá¬ááºááá¬áẠá¡áá¶á¯áœá¬ážáŒ ááŸáá¯ááºáá±ááŒááºáœá¬ážá á±áá¬áœá¬ážáááá¬ááŸáá¯áá¬ááœá±áẠá¡áá¶ááœá±ááºáá®ááá±ááá®áœá¬áž ááŸáááŸáááŸáá¯ááºááŸáᯠáá¶á¯ááááºááŸá¯ ááŸáá¯áœá¬ážáá¬áá±ááŒááºáœá¬ážá ááœá±á¬áœá¬áž-áááœá¬ážááŸáá¯áœá¬áž-áŒá¶ááœá±ááºáœá¬ážá ááºáœá¬ážáá¬áááœá¬ážááá¬ááºáœá¬ážááŒááºáœá¬ážáᬠáá°áá¬á á²á· ááŸáá¯ááºáŒááá¬á ááºáœá¬ážáá¬ááŸáᯠá²á· á¡ááá¬ááºá¡áá° áááŒá¯ááŒááºáœá¬áž á±áá²á· á¡á áŸááŒá¯áœá¬ážáá áœá¬ážáá°áœá¬ážáááœá±ááŸáᯠáááŸáŸááá±ááŸáááºáá«áááºá Definition of Orthodontics ááœá±á¬áœá¬ážááŸááá¯áááŸá¯ááá¬áááºáᬠá¥á®áœá¬ážááŒá«ááºáœá¬áž-á ááºááŸá¬-áááœá¬ážááŸáá¯áœá¬ážááá®áœá¬ážááœá±á¬áœá¬ážááŸá¯á ááœá±á¬áœá¬ážá á¬áœá¬áž ááœá±á¶áœá¶á· áááŸááŒá¯áœá¬ážáá¬áá¶á¯á á¡ááá±á«áºáááœá¬ážááŸáá¯áœá¬ážááŸáŸáááœá±á¬áœá¬ážá á¬áœá¬ážá á²á· áá¡á¬ááºáááœá¬ážááŸáá¯áœá¬ážááŸáŸáááœá±á¬áœá¬ážá á¬áœá¬áž áááºááŸáŸááá¶á¯á¡ááá¡áá¬áœá¬ážá ááŸáŸáááá²á·áºááᬠáá¶á¯á±á¶á០áááœá±áááºááááᬠááœá±ááºááááºááááá¬á á¬áœá¬áž á±áááºááŸáᯠá²á· ááŸáᯠááá²á·áá¬ááŒááºáœá¬ážá ááá¬áá«ááŸá¬áááœá±ááŒááºáœá¬ážá ááŸáá¯á¡ááºááá¬áá¯áááŸá¯áááœá¬ážááŒááºáœá¬ážá á¡áŒ áŸáááºáá®áááŸááŒá¯áááºáá¬ááœá±ááºáá¯áááŸá¯ áááœá¬ážááŒááºáœá¬ážááŸáᯠá²á· ááŸáᯠáááŒá¯áá¯ááºáááœá¬ážááᬠááá¬áááºááá±áºáá«áááºá Ideal occlusion áá°áá±áºá¥á®áœá¬ážá á²á· áááœá¬ážááŸáá¯áœá¬ážá á²á·ááœá±á¬áœá¬ážáááœá±ááŸáᯠáááá²á·áºááŸáá¯ááºááẠáá®áá¬ááᬠááœá±á¬áœá¬ážá á¬áœá¬ážá áá¶á¯á±á¶ááŸááºááᬠáááœá¬ážááŸáá¯áœá¬ážá¡ááá¡áá¬áœá¬ážá á²á· á¡áá° á¡ááŒá¬áœá¬ážáááºááŸááºáá¬áœá¬ážááᬠá¡áŒ ááºá á¬áœá¬ážááŸáá²á·áºáááá²á·áºá±á¶á¯ááŸáá¯ááºáá®áááá«á normal occlusion ááŸáᯠá²á· áááºááŸááºááá²á·ááŸáŸááá« áááºá Normal occlusion ááŸáŸááá²á· áá°áá¬áááœá±á¡á á¬áœá¬ážá±á¯ááŸáᯠááŸá¯áŸáááºáœá¬ážááŸá¥áºááá²á·áá¬ááŸá¯áááœá± áááŒá¯áá¯ááºááá®áœá¬áž á±á¶ááá¡ááá±áº ideal occlusion áááºááŸááºáŒ ááºáááœá±ááŸáᯠáá¬áœá¬ážááŸáŸááá«áááºá áááá²á·áºáááºáááœá±áœá¶á· ááŸá¬ááá¬á²á· ideal occlusion ááŸáŸááá²á·áá°áá¬áááœá±áᬠá¡ááá¡ááœá±ááºáááºáœá¬ážáá«ááŸááá²á·áºáááºá Normal occlusion Ideal occlusion ááŸáá¯áá²á· á±á¶áááŒá¯á¡ááá¡áá¬áœá¬ážááá áááºáŒá¶ááŸáá¯ááºáá²á·ááŸáááºáœá¬ážáá±á¬ááºáœá¬ážááŸá¯á¡áááºáœá¬ážáááºáá¬ááŸáŸááá²á· occlusion ááŸáᯠnormal occlusion ááŸáᯠá²á· ááŒá±á«áºáá«áááºá ááœá±á¬áœá¬ážáááœá±á á²á·á¡ááŸá¡áááŸáá¯ááá¬á áá¯ááºáááºáœá¬ážááá¬ááºáá¬ááŸáá¯ááᬠáááŸááŒáŸáá¯ááºáá±á á¡áááºáœá¬ážáááºááŸáááºáœá¬ážáá±á¬ááºáœá¬ážááŸá¯áááœá¬áž ááŸáŸáááááŸáááºáá«áááºá Class I Molar relationship, Class I incisor relationship, No rotation, No spacing, Flat or mildly increased (†1.5 mm) curve of Spee ááá±áºááááá²á·áºáá«áááºá
2.
Malocclusion á±á¶áááŒá¯áááºááŸááºáŒ ááºáááœá±ááá ááŸáááŸááá¬áá¬
ááŸáááºáœá¬ážáá±á¬ááºáœá¬ážááááá®áœá¬áž ááœá±á¬áœá¬ážá á²á· áááœá¬ážááŸáá¯áœá¬ážáááœá±á á²á· á¡ááŸá¡áá á²á· áá¯ááºáááºáœá¬ážááŸáᯠáŒá»áœááºááœá±ááºáœá¬ážáá±áá²á·á¡ááá¡áá¬áœá¬ážáá±áºáŒá¯ááŸáᯠmalocclusion ááŸáᯠá²á·áááºááŸááºááŸáá¯ááºáá«áááºá Malocclusion ááá±áºááŸáá¯ááºáœá¬áž ááœá±á¬áœá¬ážááŸááá¯áááŸáᯠá²á· ááá¯ááºáá«áá°áœá¬ážá ááŸáá¯áŒ ááºá០ááŸáá¯áá«ááŸááá²á·áºáá²á·ááºá ááœá±á¬áœá¬ážááŸááá¯áááŸáá¯ááºááẠáá°áá¬á¡ááœá±áẠááŸáá¯ááŸáá¬áá¬ááá±áºááá±áºá ááŸáá¯ááá®áœá¬áž á±á¬áœá¬ážááŸáᯠá²á· áá«áœá¬ážááŸáᯠá²á· ááá¬ááºáœá¬ážáá¬áá¬áááá±áºááá±áº á¡á áŸááŒá¯áœá¬ážááŸáŸááááºááŸáá¯á០ááœá±á¬áœá¬ážááŸááá¯ááá«á ááœá±á¬áœá¬ážááŸááá¯áááá²á·áºáá°áá¬áᬠááœá±á¬áœá¬ážáá á²á· áºááŸááºáœá¬ážáááœá¬ážááŸáᯠááá¬ááºáœá¬ážááá¬ááºáœá¬ážáá¯ááºáá²á· áá°áᬠááá±áºááá²á·áºáá«áááºá ááá¬áááºááœáŸááºááá¬áœá¬ážáŒ ááºá¡ááŸáá¯ááºáœá¬áž ááááጠá¬áŒ ᬠááŸáá¯ááºáá¬áááºáá²á·áá° ááá±áºááá²á·áºáá«áááºá ááœá±á¬áœá¬ážááŸáááŸáááŸááá¬áááœá±ááŸáᯠááŸáá¯ááŸáá¯áŒ ááºáŒ áẠáááºáááºáŒ ááºáá° ááá±áºááá²á·áºáá«áááºá áááŒá¬áœá¬ážáá°á á¡áááºáœá¬ážááŸáá¯ááºááœá±ááºáœá¬ážááŸáᯠá²á· ááá¯ááºáŒ ááºáá¯ááºáŒ ááºá á²á· ááœá±á¬áœá¬ážáá¬ááŸááá° áááá±áºááá²á·áºáá«áá°áœá¬ážá ááœá±á¬áœá¬ážááŸáááá¬á²á·áááºááŸáá¯ááẠáá°áá¬á¡ááœá±áẠááá¬ááºáœá¬ážá áŸááŒá¯áœá¬ážáááœá±á áá¬áááœá±ááá±áºááá ááŸáá¯áœá¬ážá áŸááŒá¯áœá¬ážáááœá±á áá¬áááœá±ááá±áºáá ááŸáá¯áá¬ááŸáᯠጠáŸáááºááŸáá¯áœá¬ážáááá²á·áºááá«áááºá ááá¬ááºáœá¬ážáá²á·á¡áŒ ááºáááœá±á ááŸáá¯á á¬áœá¬ážááááá²á·áºáá«áááºá Reasons for Orthodontic Treatment áá¬á²á·áááá¬áá²á·áº ááœá±á¬áœá¬ážááŸááááááŸáá¯ááẠá¡ááŸáá á¡áŒ ááº(á)ጠááºáááá¬áá²á·áº ááá±áºááŸáá¯ááºáá«áááºá áá á ááºáá¬-áááœá¬ážááŸáá¯áœá¬áž- ááœá±á¬áœá¬ážáááœá±ááŸáᯠááŸáá¯ááŸáá¯ááŸáááá²á·áºáááºáá±ááŸáᯠá²á· áá ááœá±á¬áœá¬ážáááœá±á á²á· á¡ááá¡áá¬áœá¬ážá áááá¬ááŸááºááá®áœá¬áž á±á¬áœá¬ážááŸáᯠá²á· áá«áœá¬ážááŸáᯠá²á·ááá¬ááºáœá¬ážáá±ááŸáᯠá²á· áá ááá®ááá¬ááá±áºááááá®áœá¬áž áá á²á· áºááŸááºáœá¬ážáááœá¬ážáá¯ááºááŸáᯠá²á· áŒááºáá²á·á¡ááœá±áẠááááŸááºááŸá¬ ááœá±á¬áœá¬ážá á²á· ááœá±á¬áœá¬ážáá¶á¯áœá¬ážáááœá±á á²á· á ááºáœá¬ážáá¬áááœá¬ážááŸáᯠááŸááŒáŸáá¯ááºáá±ááŸáá¯ááºáá²á· ááœá±á¬áœá¬ážá á²á· áááœá¬ážááŸáá¯áœá¬ážáááœá±ááŸáᯠáá®áá¬áá¬áá¡á¬áẠáá¯áááŸá¯áááœá¬ážááŸáᯠá²á· á±áááºááŸáᯠá²á·ááá±áºáá«áááºá
3.
The Scope and
Aims of Orthodontic Treatment ááœá±á¬áœá¬ážááŸááááºááŸáá¯áᬠááŸááŸáᯠá²á· áá±áºáŒá¯áááºáœá¬ážá¡ááœá±áẠááá¯ááºáá«áá°áœá¬ážá áá°áá¬á¡ááá á²á· ááŸááœá±á¬áœá¬ážááẠááŸáááŸáááŸáá¯ááºááŸáᯠáá¶á¯ááááºááŸá¯ ááŸáá¯ááŸáŸááá¬áá¬ááá¬á²á· á¡ááŸááºáá«á ááœá±á¬áœá¬ážááŸáááŸáá¯ááºááŸáᯠá²á· ááŸááœá±á¬áœá¬ážáá²á·á¡áŒá« ááœá±á¬áœá¬ážáááŸááŸáᯠá²á· á ááºááŸá¬ááẠá¡á¬áœá¬ážáááºááá¬á áŸááŒá¯áœá¬ážááá¬á²á· áááŸáŸáááá¬á²á·áá«áá°áœá¬ážá áá« á²á· á¡áááẠááœá±á¬áœá¬ážááŸáááŸáá¯ááºáá²á·á¡ááœá±áẠááœá±á¬áœá¬ážááŸáá²á·áºáŒá¶ááœá±ááºáœá¬áž á ááºáœá¬ážáá¬áááœá¬ážááŸáᯠááŸáá¯ááŸáá¯ááá¬ááºáœá¬ážáá¬áá±áá«ááŸááá²á·áºáááºá ááœá±á¬áœá¬ážá á ááœá±á¬áœá¬ážáááºááá®áœá¬áž á¡á±á¬áááºáááá¬áááœá±ááŸáᯠáááŒá¯ááááºááá®áœá¬áž ááá±áºááœá±á¬áœá¬ážáá±ááŸáá¯ááºáá«áááºá áááœá¬ážááŸáá¯áœá¬ážá¡ááá¡áá¬áœá¬ážáááŸááºááŸáᯠá²á· áááœá¬ážááŸáá¯áœá¬ážá¡áá±áºá á²á· áááœá¬ážááŸáá¯áœá¬ážááááºáá¬áœá¬ážáááœá± áá¬áááááºáá¬á áŸááŒá¯áœá¬ážááŸáᯠá¡ááŸáá¯ááºáœá¬ážá¡áá¬áá±áºáŒá¯á¡ááŸá áááºáá¬ááœá±á¬áœá¬ážáá± ááŸáá¯ááºáá«áááºá ááá®ááá¬áá²á· ááœá±á¬áœá¬ážáááœá±áááá¬áá²á·áº á¡ááá±á«áºáá¡á¬ááºááœá±á¬áœá¬ážáááœá±ááá¬áœá¬ážááŸá¬ ááŸááŒáŸáá¯ááºááŸá¯ááá±áºáááºáá«áááºá ááœá±á¬áœá¬ážáááœá± áá®ááœá±á¬áœá¬ážááẠáááºáááºááá±áºááá±á«áºáá¬ááŸáá¯ááºáá²á· ááŸááŒáŸáá¯ááºááŸá¯áááœá±ááŸáᯠáááºááŸá¬áœá¬ážááá®áœá¬áž ááá±áºááœá±á¬áœá¬ážáá«ááŸááá²á·áºáááºá ááœá±á¬áœá¬ážááŒá«áááá²á· áá°áá¬áááœá±ááŸáá¯ááẠáááŸáœá¶á·ááœá±á¬áœá¬ážáááœá±ááŸáᯠáááá¬áŒá áŒáŸáá¯ááºááŸááááºáá«áááºá ááœá±á¬áœá¬ážááŸáááŸáá¯ááºááẠááŸááŒáŸáá¯ááºááŸá¯ááá±áºáᬠáááºáœá¬ážááœá±á¬áœá¬ážááŸáá¯ááºáá«áááºá ááœá±á¬áœá¬ážáá¯áááœá± ááááºáŒááºááŸá¬ ááá®ááá¬ááá±áºáááá²á· ááœá±á¬áœá¬ážáááœá±ááŸáᯠáááŸááŒá¯áááºááœá±á¬áœá¬ážááŸááá¯ááá¬áœá¬ážááŒááºáœá¬ážá¡á¬áœá¬ážáááá²á·áº ááœá±á¬áœá¬ážáá¯á±áŸáá¯áẠááᬠááŸáá¯ááŸáá¯á¡áááºááááá±ááŸáá¯ááºáá«áááºá ááœá±á¬áœá¬ážáá¶á¯áœá¬ážááá¬áá«ááá±áºáááá²á· áááºáááá±á¬ááºáœá¬ážáááá²á· ááœá±á¬áœá¬ážáááœá±ááŸáᯠsplinting ááá¯ááºáŒááºááŸá¬ áá®áá¬ááœá±á¬áœá¬ážáá¡á¬áẠáááŒá¯ááááºááŸáá¯ááºáá«áááºá áááœá¬ážááŸáá¯áœá¬ážáŒáœá±á±áŸáááºáá¯áááŸá¯ááá¯ááºáŒááºááŸá¬ ááœá±á¬áœá¬ážáááœá±ááŸáᯠá¡áááºá¥á®áœá¬ážáá¶á¯áœá¬áž ááŸááá¬áœá¬ážááŸáá¯ááºáá«áááºá áááá¬ááœá±ááŸá¬áœá¬ážááá«ááºáááá²á· ááœá±á¬áœá¬ážáááœá±ááŸáᯠáááá¬ááŸááºááá¬ááºáá¡á¬áẠááœá±á¬áœá¬ážááŸááá¯ááááœá¬ážááŸáá¯ááºáá«áááºá
4.
Orthodontic Treatment Options áá
No treatment - ááœá±á¬áœá¬ážáááœá±á á¡áááºáœá¬ážáááºá ááá®ááá¬ááá±áºáááá²á·á¡áŒá« ááœá±á¬áœá¬ážáááŸáá ááጠááºááẠááááŸáᯠá²á· ááá«áááºá ááœá±á¬áœá¬ážááŸáááŸáá¯ááºááẠlong-term stability and retention ááŸáá±á ááŸáᯠááá²á·áºá±á¥áºáœá¬ážá±á¬áœá¬ážááá«áááºá ááá¬ááºáœá¬ážá áŸááŒá¯áœá¬ážá á²á·ááŸáá¯áœá¬ážá áŸááŒá¯áœá¬ážááŸáᯠጠáŸáááºáœá¬ážááŸáá¯áœá¬ážáááá²á·áºááá«áááºá áá Extraction only - áá±áºáŒ áŸááŒá¯áœá¶á·áá°áá¬áááœá±ááŸá¬ áááºáááá²á· ááœá±á¬áœá¬ážáááœá±ááŸáᯠááŸá¯ááºáááœá¬ážááŸáá¯ááºáá¶á¯á á²á· á ááºááœá±á¬áœá¬ážáááœá±á á²á· á¡ááá¡áá¬áœá¬ážááŸáᯠá¡ááŸáá¯ááºáœá¬ážá¡áá¬áá±áºáŒá¯á¡ááŸá ááŸáá¯ááŸáá¯ááá¬ááºáœá¬ážááœá±á¬áœá¬ážáá±ááŸáá¯ááºáá«áááºá á¡áá°áœá¬ážááááá²á·áº growing patient áááœá±ááŸá¬ áááºááœá±á¬áœá¬ážáááœá¬ážáááœá±á ááœá±á¬áœá¬ážáááºá¡ááŸáá¯áááœá¬ážáááœá±ááŸáᯠááŸá¯ááºáááœá¬ážááŒááºáœá¬ážá¡á¬áœá¬ážáááá²á·áº áá°áá¬á á²á· ááœá±á¬áœá¬ážáááœá±ááŸáᯠááá²á·áºááá¬áºáá²á· áááá¬áá®ááŸáᯠá²á·á¡ááŸáá¯á¡áá á¬ááºáááœá±áœá¶á·áá±áááºááá®áœá¬áž ááŸáá¯ááŸáá¯áá®áá¬ááŸáááœá±á¬áœá¬ážáá±áá«áááºá áá Removable appliance treatment - ááœá±á¬áœá¬ážáááœá¬ážáááœá±ááŸáᯠá¡áááºáœá¬ážáááºáᬠáááŒá¯ááááºááŸáᯠá²á·ááŸáá¯á¡ááºáá²á·á¡áŒá« removable appliance ááŸáᯠá¡áá¶á¯áœá¬ážáááŒá¯ááá®áœá¬áž áá¯áááŸáá¯ááºáá«áááºá á¥ááᬠ- simple tipping movements of few teeth; to tip upper incisor forward in anterior cross-bite áá Fixed appliance - ááœá±á¬áœá¬ážáááœá± ááá®ááá¬ááá±áºááœá±ááºáœá¬ážááááá®áœá¬áž three planes (antero-posterior, vertical and lateral)ááŸá¬ ááŸáá¯á¡ááºáááŸáᯠáááœá±áœá¶á·áá±ááŸáᯠá²á· á¡ááœá±áẠfixed appliance ááŸáᯠá¡áá¶á¯áœá¬ážáááŒá¯ááŸáá¯ááºáá«áááºá á á Functional appliances - áááœá¬ážááŸáá¯áœá¬ážá áá¶á¯ááŸááºááá¯ááºá á¡ááŸáá¯á¡ááŸááºááá®áá²á· growing patients áá°áá¬áááœá±ááŸá¬ á¡áá¶á¯áœá¬ážáááŒá¯ááŸáá¯ááºáá«áááºá áá Orthognathic surgery - áááœá¬ážááŸáá¯áœá¬ážá ááŸáá¯áœá¬ážááŸáá¯áœá¬ážááœá±á¬áœá¬ážááŸááá¯ááá¶á¯á á²á· ááŸáá¯áŒ ááºáá²á·á¡ááá¡áá¬áœá¬ážáááá¬ááºááŸáá¯ááºáá°áœá¬ážááŸáá¯ááẠáŒáœá±á±áŸáááºáá¯áááá®áœá¬áž áááŒá¯ááááºááŸáá¯ááºáá«áááºá áŒáœá±á±áŸáááºááá¯ááŒááºááŸá¬ ááœá±á¬áœá¬ážááŸááá¯áááŸá¯áááŒá¯áá¯ááºáá¬á áŒáœá±á±áŸáááºáá¯áááá®áœá¬ážááá¬áẠáááºáá¶ááá®áœá¬áž ááœá±á¬áœá¬ážááŸááá¯áááŸá¯áááŒá¯áá¯ááºáá¬áááœá±ááŸáᯠáááŒá¯áá¯ááºááŒááºáœá¬ážá¡á¬áœá¬ážáááá²á·áº áááœá¬ážááŸáá¯áœá¬ážá á²á· ááœá±á¬áœá¬ážáááœá±ááŸáᯠáá®áá¬ááŸááá±áá«áááºá
5.
6.
7.
The Timing of
Orthodontic Treatment The deciduous dentition - áá®á¡ááá²á·áºááŸá¬ ááœá±á¬áœá¬ážááŸááá¯áááŸá¯ááŸáᯠáááŒá¯áá¯ááºáŒáá«áááºá ááœá±á¬áœá¬ážá¡ááŸáá¯ááœá±á¬áœá¬ážáááºáááá¬áá²á·áº ááœá±á¬áœá¬ážááá®ááá¬ááá±áºáááááºááá±áºáá±á malposition tooth or premature contact áááá¬áá²á·áº mandibular displacement leading to unilateral posterior crossbite ááá±áºáááááºááá±áºáá± ááŸáá¯á¡ááºáá²á·áá¯áááŸá¯áááœá±ááŸáᯠáááŒá¯áá¯ááºáááœá¬ážááŸáá¯ááºáá«áááºá The early mixed dentition - áá®á¡ááá²á·áºááŸá¬ developing malocclusion ááá±áºáááá¬áááœá±ááŸáŸááŒá²á·ááẠáááŸááŒá¯áááºáá¯áááŸá¯ áááŒá¯áá¯ááºáááœá¬ážááŸáá¯ááºáá«áááºá á¥ááᬠ- planned extraction of intensively carious first permanent molars (8.5 â 10 years old); balancing extractions of deciduous teeth; serial extractions, space maintainers may be fitted; Simple orthodontic treatment to correct in-standing incisor or to eliminate a mandibular displacement; reverse headgear to correct retrognathic maxilla in Skeletal Class III ááá±áºááŸáá¯ááºááẠá¡áŒ áŸááẠ(á) á á á²á·(á) á á¡ááœá±ááºáœá¬ážááŸá¬ ááááºááááºáááºáááºáá¯áááŸáᯠá²á· ááá®áœá¬ážááœá±á¬áœá¬ážááá²á·áº áá¯áááŸá¯á áŸááŒá¯áœá¬ážá áá¯ááá®áœá¬ážááẠstable ááá±áºááœá±á¬áœá¬ážááá²á·áº áá¯áááŸá¯á áŸááŒá¯áœá¬ážááŸáᯠáááŒá¯áá¯ááºááŸáá¯ááºáá«áááºá The late mixed and early permanent dentition (10-13 years old) - áá®á¡ááœá±ááºááŸá¬ ááœá±á¬áœá¬ážááŸááá¯áááŸá¯ááŸáᯠá¡á á¬áœá¬ážáá¶á¯áœá¬áž áááŒá¯áá¯ááºáááá«áááºá áááœá¬ážááŸáá¯áœá¬ážá á¥áºáœá¬ážááááẠáááœá¬ážááŸáá¯áœá¬ážááŸáᯠጠáœá¶á·áááœá¬ážááŒááºáœá¬ážá¡á¬áœá¬ážáááá²á·áº ááœá±á¬áœá¬ážáááºááŒááºáœá¬ážááŸáᯠáá¯áááŸáá¯ááºáá«áááºá áááœá¬ážááŸáá¯áœá¬ážááá®áœá¬ážááœá±á¬áœá¬ážáááá²á·á¡ááœá±ááºááá±áºáá¬áááá¬áá²á·áº áá®á¡ááá²á·áºááŸá¬ ááŸáá¯á¡ááºááẠfunctional appliance ááŸáᯠáááºáááºáá«áááºá The late permanent dentition (>16 years old) - áá®á¡ááá²á·áºááŸá¬ ááœá±á¬áœá¬ážááŸááá¯ááá²á·á¡áŒá« áá°áá¬áá±áºá¥á®áœá¬ážáŒ ááºáœá¬ážá±á®á á²á· á¡ááá¡áá¬áœá¬ážá¡á treatment planning and mechanics ááŸáᯠááŸáá¯á¡ááºáááŸáᯠááœá±ááºáœá¬ážáá¶áááœá¬ážááœá±ááá®áœá¬áž áá¯áááŸá¯ áááœá¬ážááá«áááºá Adult patients áááœá±ááŸáᯠáá¯áááŸá¯áááœá¬ážááá¬á growing patients áááœá±ááŸáᯠáá¯áááá¬ááẠá¡áŒ áŸáááºááŸáá¯ááá¬áá«ááŸááá²á·áºáááºá ááá®áœá¬ážááœá±á¬áœá¬ážááŸá¯áááºááœá±á¬áœá¬ážáá²á·áá°áá¬áááœá±ááŸá¬ severe skeletal discrepancy ááá±áºááááẠáŒáœá±á±áŸáááºáá¯ááááœá¬ážááŸáá¯ááºáá«áááºá By Nay Aung, BDS, PhD (15.10.2023)
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