| ABO | American Board of Orthodontics |
| CAs | Clear Aligners |
| CBCT | Cone Beam Computed Tomography |
| CCTs | Controlled Clinical Trial |
| dOIRR | Difference in Orthodontically Induced Root Resorption |
| EARR | External Apical Root Resorption |
| F | Females |
| FAs | Fixed Appliances |
| M | Males |
| OIRR | Orthodontically Induced Root Resorption |
| RCT | Root Canal Treated Teeth |
| RCTs | Randomized Controlled Trials |
| SS | Statistically Significant |
| SSD | Statistically Significant Difference |
| VPT | Vital Pulp Teeth |