| Term | Definition |
| crossbite | reverse in normal labio lingual relationship of maxillary and mandibular teeth |
| overjet | horizontal projection of upper teeth over lower teeth |
| archwire | piece of wire secured into brackets with ligation |
| ligature | wire or elastic used to secure the archwire in place |
| headgear | inner and outer bow used to move maxillary teeth |
| retainer | appliance used to stabilize dental arch after treatment is compleated |
| cementation | process of cementing a fixed appliance with a permanent cement |
| orthodontics | specialty in dentistry concerned with malocclusion |
| supragingival | above the gumline |
| bracket | used to hold archwire |
| overbite | verticle overlapping of the maxillary teeth over the mandibular teeth |
| buccal tube | placed on upper first molars for headgear to fit into |
| positioner | plastic retainer that covers both maxillary and mandibular teeth to help allign them |
| intraoral | inside the mouth |
| articulate | to bring teeth together in occlusion |