Abstract
AIM: To evaluate the presence and the status of persistent primary second molars (DM2) in subjects with
the congenital absence of second premolars (PM2) in relation to age.
MATERIALS AND METHOD: Panoramic radiographs of individuals above 10 years of age with agenesis of at
least one PM2 were evaluated. Patients were divided into three groups according to age: 10-13 years, 14-17
years and 18-22 years. The study group was examined for the presence and location of retained DM2, the
presence of caries/restorations, infraocclusion and root resorption.
RESULTS: A total of 131 subjects with PM2 agenesis were included, 82 females (62.6%) and 49 males
(37.4%) aged 10-22 years (mean age: 13 years 11 months). The majority were missing one or two PM2. PM2
agenesis occurred three times more frequently in the mandible than in the maxilla. In all, 174 retained DM2
were present (33%) and their incidence was higher in the younger age groups. In all age groups, the majority
of the DM2 were retained in the mandible (79%). Caries/restorations were found in 88 (50.6%) and
infraocclusion in 21 (12%) retained DM2. The roots were resorbed mostly in half of the root length (35%).
CONCLUSIONS: Long-term survival of DM2 with PM2 agenesis is uncertain, especially at a younger age. In
individuals older than 17 years, the prognosis for a healthy DM2 seems favourable, if no distinct
infraocclusion or extensive root resorption is present.
the congenital absence of second premolars (PM2) in relation to age.
MATERIALS AND METHOD: Panoramic radiographs of individuals above 10 years of age with agenesis of at
least one PM2 were evaluated. Patients were divided into three groups according to age: 10-13 years, 14-17
years and 18-22 years. The study group was examined for the presence and location of retained DM2, the
presence of caries/restorations, infraocclusion and root resorption.
RESULTS: A total of 131 subjects with PM2 agenesis were included, 82 females (62.6%) and 49 males
(37.4%) aged 10-22 years (mean age: 13 years 11 months). The majority were missing one or two PM2. PM2
agenesis occurred three times more frequently in the mandible than in the maxilla. In all, 174 retained DM2
were present (33%) and their incidence was higher in the younger age groups. In all age groups, the majority
of the DM2 were retained in the mandible (79%). Caries/restorations were found in 88 (50.6%) and
infraocclusion in 21 (12%) retained DM2. The roots were resorbed mostly in half of the root length (35%).
CONCLUSIONS: Long-term survival of DM2 with PM2 agenesis is uncertain, especially at a younger age. In
individuals older than 17 years, the prognosis for a healthy DM2 seems favourable, if no distinct
infraocclusion or extensive root resorption is present.
| Originalsprog | Engelsk |
|---|---|
| Artikelnummer | 51 |
| Tidsskrift | European Journal of Orthodontics |
| Vol/bind | 43 |
| Nummer | 5 |
| Sider (fra-til) | e30 |
| Antal sider | 1 |
| ISSN | 0141-5387 |
| DOI | |
| Status | Udgivet - okt. 2021 |
| Begivenhed | European Orthodontic Society Virtual Online Congress 2021 - Online - virtuel konference Varighed: 2 jul. 2021 → 3 jul. 2021 |
Konference
| Konference | European Orthodontic Society Virtual Online Congress 2021 |
|---|---|
| Lokation | Online - virtuel konference |
| Periode | 02/07/2021 → 03/07/2021 |