Effect of ovariectomy on maxilla and mandible dimensions of female rats.

Abstract:

OBJECTIVE:The role of oestrogen in craniofacial growth still remains unclear. Therefore, the present study aimed to assess the effect of oestrogen deficiency on maxilla and mandible dimensions. SETTING AND SAMPLE POPULATION:The study was conducted at the Department of Pediatric Dentistry at the School of Dentistry of Ribeirão Preto, University of São Paulo, and used forty female Wistar rats. MATERIAL AND METHODS:Ovariectomy (OVX) and placebo surgery (Sham) were performed when animals were twenty-one days old (prepubertal stage). Dimensions of the maxilla and mandible were assessed by craniometric analysis using radiographs, during and after puberty of the animals (45 and 63 days old, respectively). Quantitative real-time PCR and immunohistochemical analyses were performed to determine the expression and localization, respectively, of oestrogen receptor alpha (ERα) and oestrogen receptor beta (ERβ) in different growth sites of the evaluated structures at puberty. The differences between the groups for each outcome were evaluated using the t test with an established alpha error of 5%. RESULTS:There were significant differences between the OVX and Sham groups for horizontal and vertical linear measurements in the maxilla and the mandible at both pubertal and post-pubertal stages (P < .05). The ovariectomized rats showed significantly greater measures for all dimensions assessed. No differences in gene expression of ERα and ERβ were identified at the different growth sites between the OVX and Sham groups (P > .05). Immunohistochemical analyses revealed the presence of both oestrogen receptors in osteoblasts and chondrocytes in the midpalatal suture and mandibular condyle, respectively, in the OVX and Sham groups. CONCLUSION:Our results suggest that oestrogen deficiency from the prepubertal stage might increase the growth of the maxilla and mandible in female rats.

journal_name

Orthod Craniofac Res

authors

Omori MA,Marañón-Vásquez GA,Romualdo PC,Martins Neto EC,Stuani MBS,Matsumoto MAN,Nelson-Filho P,Proff P,León JE,Kirschneck C,Küchler EC

doi

10.1111/ocr.12376

subject

Has Abstract

pub_date

2020-08-01 00:00:00

pages

342-350

issue

3

eissn

1601-6335

issn

1601-6343

journal_volume

23

pub_type

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