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Erschienen in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie 3/2015

01.05.2015 | Original article

Orthodontic forces add to nicotine-induced loss of periodontal bone

An in vivo and in vitro study

verfasst von: Dr. C. Kirschneck, P. Proff, M. Maurer, C. Reicheneder, P. Römer

Erschienen in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie | Ausgabe 3/2015

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Abstract

Objectives

Nicotine is considered an etiologic factor for chronic inflammatory phenomena within the periodontal ligament that may result in loss of periodontal attachment. Considering that smokers account for 26 % of adult and 12 % of adolescent patients in orthodontic practice, we performed in vivo and in vitro studies as to whether orthodontic forces may add to the nicotine-induced loss of periodontal bone.

Methods

Fourteen male rats (Fischer 344 inbred) were used. Seven of these served as controls, while the other seven received daily subcutaneous injections of 1.89 mg L-nicotine per kg body weight. Both groups were exposed to orthodontic mesialization of the first two upper left molars using a NiTi closed-coil spring, the contralateral side serving as control. Periodontal bone loss was assessed by cone-beam computed tomography (CBCT). Human periodontal fibroblasts were stressed by compression (2 g/cm2) and/or nicotine (3/5/7.5 µmol), and the expression of cyclooxygenase-2 (COX-2), prostaglandin E2 (PGE2), interleukin-6 (IL-6), osteoprotegerin (OPG), and receptor activator of nuclear factor κB ligand (RANKL) was determined at the transcriptional level by quantitative real-time polymerase chain reaction (qRT-PCR) and at the translational level by enzyme-linked immunosorbent assay (ELISA). In addition, differentiation of co-cultured murine RAW264.7 cells to osteoclast-like cells was quantified by tartrate-resistant acid phosphatase (TRAP) staining.

Results

Orthodontic force application in vivo led to a significant increase in nicotine-induced periodontal bone loss, and cell compression in vitro to increased COX-2, PGE2, IL-6, and RANKL expression, reduced OPG expression, and enhanced differentiation of RAW264.7 cells to osteoclast-like cells compared to nicotine alone.

Conclusion

Additional loss of periodontal bone must be expected during orthodontic treatment of smokers. Clinicians should inform their patients of this increased risk and refrain from performing tooth movements before cessation of smoking.
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Metadaten
Titel
Orthodontic forces add to nicotine-induced loss of periodontal bone
An in vivo and in vitro study
verfasst von
Dr. C. Kirschneck
P. Proff
M. Maurer
C. Reicheneder
P. Römer
Publikationsdatum
01.05.2015
Verlag
Springer Berlin Heidelberg
Erschienen in
Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie / Ausgabe 3/2015
Print ISSN: 1434-5293
Elektronische ISSN: 1615-6714
DOI
https://doi.org/10.1007/s00056-015-0283-7

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