Abstract
After exfoliation of the primary incisors and eruption of the permanent incisors, the dentist has the opportunity of observing closely the beginning of occlusal changes. In several cases, alterations, such as lower anterior crowding, can be prevented and treated with proper follow-up. In the mixed dentition, one of the mechanisms for maintaining space and favoring dental alignment is to preserve leeway space before permanent second molar irruption. Among the devices with this function, the Nance lingual arch helps maintaining the position of the permanent mandibular molars and incisors after a premature loss of the primary canines. This paper describes the applicability of Nance lingual arch for preserving leeway space, thus contributing for correction of lower anterior crowding.
Highlights
Dental crowding can be classified as primary, secondary, and tertiary
Secondary crowding occurs in the posterior area due to premature extractions of primary molars, with consequent loss of the arch length
The incisors erupt close to the alveolar ridge line, characterizing mild crowding. These dimensional alterations occur during and immediately after the first transitional period of the mixed dentition, and contribute to increase the dental arch perimeter, which gives a transitory feature to temporary crowding [3] (Fig. 1 A-C)
Summary
After exfoliation of the primary incisors and eruption of the permanent incisors, the dentist has the opportunity of observing closely the beginning of occlusal changes. Alterations, such as lower anterior crowding, can be prevented and treated with proper follow-up. One of the mechanisms for maintaining space and favoring dental alignment is to preserve leeway space before permanent second molar irruption. Among the devices with this function, the Nance lingual arch helps maintaining the position of the permanent mandibular molars and incisors after a premature loss of the primary canines. This paper describes the applicability of Nance lingual arch for preserving leeway space, contributing for correction of lower anterior crowding
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