| MTD | Maxillary transverse deficiency |
| RME | Rapid maxillary expansion |
| CAD/CAM | Computer-aided design and computer-aided manufacturing |
| HHE | Hybrid Hyrax expander |
| DDMPTBE | Digitally designed metal-printed tooth-borne expanders |
| CBCT | Cone-beam computed tomography |
| AI | Artificial intelligence |
| CR | Centre of resistance |
| 2D | Two-dimensional |
| TSD | Transverse skeletal discrepancy |
| CVM | Cervical vertebral maturation |
| MxOW | Maxillary occlusal width |
| MxAW | Maxillary alveolar width |
| MxBW | Maxillary basal width |
| MnAW | Mandibular alveolar width |
| NCW | Nasal cavity width |
| HPW | Hard palatal width |
| PH | Palatal height |
| TDI | Transverse discrepancy index |
| ANG-16 | Angulation of tooth 16 |
| ANG-26 | Angulation of tooth 26 |
| R2 | Coefficient of determination |
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