Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
The long-term survival of lower second primary molars in subjects with agenesis of the premolars
Autore:
Bjerklin, K; Bennett, J;
Indirizzi:
Inst Postgrad Dent Educ, Dept Orthodont, SE-55303 Jonkoping, Sweden Inst Postgrad Dent Educ Jonkoping Sweden SE-55303 5303 Jonkoping, Sweden
Titolo Testata:
EUROPEAN JOURNAL OF ORTHODONTICS
fascicolo: 3, volume: 22, anno: 2000,
pagine: 245 - 255
SICI:
0141-5387(200006)22:3<245:TLSOLS>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
FOLLOW-UP; INFRAOCCLUSION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Bjerklin, K Inst Postgrad Dent Educ, Dept Orthodont, Klubbhusgatan 15, SE-55303 Jonkoping, Sweden Inst Postgrad Dent Educ Klubbhusgatan 15 JonkopingSweden SE-55303
Citazione:
K. Bjerklin e J. Bennett, "The long-term survival of lower second primary molars in subjects with agenesis of the premolars", EUR J ORTHO, 22(3), 2000, pp. 245-255

Abstract

This study investigated 41 subjects, 13 male and 28 female, with agenesis of one or both lower second premolars, and with retained lower second primary molars. Intra-oral radiographs of 59 primary teeth were examined to judge the resorption of the mesial and distal roots, and were measured to record infra-occlusion of the primary teeth and tipping of the adjacent permanent teeth. The study commenced at 11-12 years of age. The mean age at the last measurement was 20 years 6 months (SD 3.62, range 13.6-31.8 years). During the observation period, only two of the 59 primary teeth were exfoliated. Five were extracted, two of which were replaced by upper third molartransplants. Beyond the age of 20 years no teeth were lost. Root resorption varied widely between individuals, but was slow. There was no typical pattern for development of infra-occlusion. Mean infra-occlusion was 0.47 mm (SD 1.13) at 11-12 years, increasing by less than 1.0 to 1.43 mm (SD 1.13) at age 17-18 years. At age 19-20 years, 55 per cent of teeth showed infra-occlusion between 0.5 and 4.5 mm, but 45 per cent showed no infra-occlusion. The space between the first molar and first premolar was a mean of 10.35 mm(SD 0.76) at age 10-12 years compared with the mean width of the second primary molar of 10.53 mm (SD 0.51). The space reduced by less than 0.5 mm to9.95 mm (SD 1.50) at age 17-18 years. If primary molars are present at 20 years of age they appear to have a good prognosis for long-term survival.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/01/21 alle ore 09:29:06