Evaluation of BSP expression and apoptosis in the periodontal ligament during orthodontic relapse: a preliminary study.
Orthod Craniofac Res
; 17(4): 239-48, 2014 Nov.
Article
in En
| MEDLINE
| ID: mdl-24924469
ABSTRACT
OBJECTIVE:
To examine the expression of bone sialoprotein (BSP) and apoptosis in an in vivo orthodontic relapse model. MATERIALS ANDMETHODS:
Male mice (10-12 weeks old), either transgenic [green fluorescent protein (GFP) driven by the BSP promoter] or wild type, were used in this study. To achieve orthodontic tooth movement (OTM), maxillary right first molars were moved mesially using closed-coil springs. Animals were divided into an OTM group (14 days continuous orthodontic force - 11 animals) or Relapse group (10 days of force application followed by 4 days of relapse - 8 animals). The control group was comprised of the contralateral maxillary molars. The periodontal ligament (PDL) was analyzed in areas of compression and tension for transgenic expression, osteoclast localization, and the presence of apoptotic cells.RESULTS:
There was a significant decrease in GFP-labeled cells on the compression and tension sides of the PDL in the OTM group compared with control. In the relapse group, GFP-labeled cells were significantly decreased only on the old compression side. Osteoclasts were localized on the compression side of the OTM group, whereas in the Relapse group, they were present on both sides. PDL apoptosis significantly increased on the compression side in OTM and Relapse groups.CONCLUSION:
Both OTM and Relapse groups exhibited a decreased number of GFP-labeled cells in areas of compression and tension. There was significant PDL apoptosis in regions under compressive forces following OTM and to a lesser extent following relapse.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Periodontal Ligament
/
Tooth Movement Techniques
/
Apoptosis
/
Integrin-Binding Sialoprotein
Limits:
Animals
Language:
En
Journal:
Orthod Craniofac Res
Journal subject:
ODONTOLOGIA
/
ORTODONTIA
Year:
2014
Type:
Article
Affiliation country:
United States