10 Incisor crossbite
Summary
Matthew is 8 years old. He presents with an upper incisor in crossbite (Fig. 10.1). What is the cause and how would you manage it?
erupted inside the lower teeth. There is no history of a fall or other trauma to the primary predecessor or to 
. 
was lost over a year ago, a little later than 
.
was extracted uneventfully under local anaesthesia 8 months ago.Examination
Extraoral
Intraoral
with carious involvement of 
mesially and 
distally. With the exception of the lower right quadrant where 
has been lost, 6edc 21 are present in each quadrant.
. 
is displaced labially; the lower arch appears uncrowded. 
are rotated mesiolabially; 
is displaced slightly palatally and there is a small median diastema. Otherwise the upper arch appears uncrowded. The incisor relationship is Class I and 
is in crossbite; 
is partially erupted with the distoincisal aspect in crossbite with 
.
What specific features would you check? Explain why.
1 The periodontal status of 
– degree of mobility and pocket probing depth associated with 
should be assessed to determine its prognosis as it is being displaced labially by deflecting occlusal contact (see below) and gingival recession is present. 
exhibited grade 2 mobility but probing pocket depth was less than 2 mm, indicating good periodontal prognosis in the event the crossbite relationship is corrected.
– degree of mobility and pocket probing depth associated with should be assessed to determine its prognosis as it is being displaced labially by deflecting occlusal contact (see below) and gingival recession is present. exhibited grade 2 mobility but probing pocket depth was less than 2 mm, indicating good periodontal prognosis in the event the crossbite relationship is corrected.
? If so, this indicates that only a small amount of labial movement of 
is required to correct the crossbite relationship. An edge-to-edge relationship of 
was easily achievable by the patient.
or 
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