Longitudinal changes of crown inclination in juveniles with normal occlusion.
- Author:
Hai-ping ZHANG
1
;
Tian-min XU
;
Xing-zhong ZHANG
;
Jiu-xiang LIN
Author Information
- Publication Type:Journal Article
- MeSH: Child; Dental Occlusion; Female; Humans; Incisor; physiology; Longitudinal Studies; Male; Molar; physiology
- From: Chinese Journal of Stomatology 2007;42(8):467-470
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo investigate the longitudinal changes in crown inclination of permanent incisors and first molars in juveniles with normal occlusion.
METHODSThe untreated sample comprised 20 subjects (6 males and 14 females) with normal occlusion from the Research Centre for Craniofacial Growth and Development of Peking University School and Hospital of Stomatology. Crown inclination was evaluated with Biaggini Rayset in two stages, stage I with first molars and four incisors in occlusion (mean, 9.5 +/- 0.9 years) and stage II with the second molars in occlusion (mean, 13.7 +/- 1.3 years).
RESULTSNo significant difference was found between sexual groups. The crown inclination of the upper central incisors decreased (P < 0.001). The crown inclination of the lower central and lateral incisors increased (P < 0.01 and P < 0.05, respectively). The crown inclination of maxillary molars decreased with growth (P < 0.001), whereas that of mandibular molars increased with growth (P < 0.001).
CONCLUSIONSMaxillary molars tended to become upright lingually, whereas mandibular molars upright buccally with growth.
