The Incisors are the first permanent teeth to erupt in the mouth, and they are the ones that lie on the front – 4 incisors in the maxilla, and 4 incisors in the mandible. The four incisors are named (4 on each side left and right) –
- Maxillary Central Incisor
- Mandibular Central Incisor
- Maxillary Lateral Incisor
- Mandibular Lateral Incisor
These are all the single rooted teeth, and provide more aesthetic function rather than for chewing but the initial biting is done using the Incisors. Following are the differences between the Maxillary and Mandibular incisors, i.e. the incisors of the upper and lower jaw. The permanent mandibular incisors are the first permanent teeth to erupt after the loss of the milk teeth, and these are followed by the eruption of the maxillary incisors.
| Permanent Maxillary Incisor | Permanent Mandibular Incisor |
| These are the widest in the Incisor class | These are the narrowest in the Incisor class |
| The central incisor is wider and larger than the lateral incisor | The lateral incisor is larger and wider than the central incisor. |
| The Marginal Ridges and Cinguli are more prominent. | The Marginal Ridges and Cinguli are less prominent. |
| The Lingual Fossa is deeper | The Lingual Fossa is shallower |
| Facial surfaces are more convex | Facial surfaces are less convex |
| Crowns are wider mesio-distally than labio-lingually | Crowns are wider labio-lingually than mesio-distally |
| Roots are rounder or triangular in cross section. No depressions are seen on mesial and distal surfaces. | Roots are oval; wider labio-lingually in cross section. Depressions on mesial and distal surfaces of roots are seen. |
| Incisal surfaces are inclined lingually | Incisal surfaces are at perpendicular to the tooth axes |
| There are several variations on these incisors | There are few variations on these incisors |
| These erupt after the lower incisors | These are the first permanent teeth to erupt |
The eruption time and sequence of the various permanent incisors:
- Mandibular central incisor: 6-7 years
- Mandibular lateral incisor: 7-8 years
- Maxillary central incisor: 7-8 years
- Maxillary lateral incisor: 8-9 years
Check out the Anatomy of the tooth to understand what differences we are actually talking about, like the parts of them etc.
very nice its help me alot
Thanx alot..It was very helpful
Really helpful to me…very nicely differentiated…tqs alot
Thank you so much@drchetan.awesomely explained with bst presentation.plz make the same for rest of the teeth.