Occlusion and malocclusion
B F
A
A
E
A
A
D
C Malocclusion
Persistent teeth
Persistence of four maxillary incisors. A From right to left: deciduous LmaxI2 (602), deciduous LmaxI1 (601), deciduous
RmaxI1 (501) and deciduous RmaxI2 (502). B From right to left: LmaxC (204), LmaxI3 (203), LmaxI2 (202), LmaxI1 (201),
RmaxI1 (101), RmaxI2 (102), RmaxI3 (103), RmaxC (104) and deciduous RmaxC (504). C From right to left: RmandI1 (401), RmandI2 (402), RmandI3 (403) and
RmandC (404). D Palatoversion of LmaxI1 (201) and RmaxI1 (101) due to persistence of de-
ciduous LmaxI2 (602), deciduous LmaxI1 (601), deciduous RmaxI1 (501) and deciduous RmaxI2 (502).
A
Malocclusion
E Suspicions of mandibular mesiocclusion due to malocclusion in the incisal area
and RmandC (404).
F Impacted hair.
Key diagnostic/treatment points The persistence of deciduous teeth may cause existing malocclusions to worsen, such as the suspicions of mandibular mesiocclusion in this case. The persistence of maxillary incisors has caused moderate palatoversion of LmaxI1 (201) and RmaxI1 (101). Initial treatment should start with interceptive orthodontic treatment (extraction of the persistent teeth).
C
B
Persistent teeth
Persistence of RmaxI3 (503). A From right to left: RmaxI1 (101), RmaxI2 (102), RmaxI3 (103), deciduous
RmaxI3 (503) and RmaxC (104). B Persistence of deciduous RmaxI3 (503). C Linguoversion of RmandC (404).
Key diagnostic/treatment points The persistence of deciduous teeth may cause malocclusions, not only with their corresponding permanent teeth, but also with the rest of the teeth of the region. In this clinical case, the persistence of deciduous RmaxI3 (503) hinders the correction of another existing malocclusion such as the linguoversion of RmandC (404). Extraction of the persistent tooth is urgent in these clinical cases. 53