Mouth breathing impairs the development of temporomandibular joint at a very early stage.

Abstract:

OBJECTIVES:The study aimed to explore the effects of mouth breathing and hypoxia on the condyle of temporomandibular joint (TMJ) via two animal models. METHODS:24 four-week-old rats were randomly separated into three groups, consisting of eight control rats, eight intermittent hypoxia (IH) rats, and eight intermittent nasal obstruction (INO) rats. We use the IH model and the INO model to simulate children suffering from hypoxia and mouth breathing. After 16 days, the condyle of TMJ and surrounding white adipose tissue (WAT) and skeletal muscle tissue were obtained for further staining and qRT-PCR. Finally, RNA-seq was used to verify the results. RESULTS:The intermittent hypoxia cannot significantly change the overall structure in the cause of short-term hypoxia stimulation, but the intermittent nasal obstruction can alter the condyle, WAT, and muscle, while also introducing noticeable structural changes in tissue hypoxia and macrophage infiltration. Sequencing data verified these findings and also suggested that this process might involve the Hif-1α/Vegf axis. CONCLUSIONS:Our findings reveal the very early structural impact of mouth breathing on condyle reconstruction in rat models, and hypoxia does not induce evident alteration on condyle. However, since these results are mainly focused on rats, further studies are needed to understand its effects on humans.

journal_name

Oral Dis

journal_title

Oral diseases

authors

Hu Z,Sun H,Wu Y,Wu X,Mei P,Wang B,Zhu M

doi

10.1111/odi.13377

subject

Has Abstract

pub_date

2020-10-01 00:00:00

pages

1502-1512

issue

7

eissn

1354-523X

issn

1601-0825

journal_volume

26

pub_type

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