The effect of pregnancy on orthodontic tooth movement in rats

Abstract

Introduction: The purpose of this study was to investigate the effect of pregnancy on orthodontic tooth movement in Wistar rats. Material and Methods: Forty eight female three-month old Wistar rats with an average weight of 250±25 gr were selected and randomly divided into two experimental (pregnant) and control groups (non-pregnant). Maxillary central incisors were tipped distally by insertion of springs exerting 30g force. Two, seven and fourteen days after spring insertion animals were sacrificed. Then the mesioincisal distance between maxillary incisors were measured. Subsequently, histological sections were prepared to count osteoclasts under a light microscope. The data on the extent of orthodontic tooth movement, and the number of osteoclasts were analyzed by independent sample t-test. Results: The results indicated that 2,7 and 14 days after force application there was no significant difference in orthodontic tooth movement between experimental and control groups (p>0.05). The number of osteoclasts were significantly lower in the experimental group 7 and 14 days after spring insertion (p<0.05). Conclusion: Pregnancy may decrease the amount of tooth movement in the linear phase but it is not statistically significant. The number of osteoclasts is significantly decreased during pregnancy. Key words:Pregnancy, rat, orthodontic tooth movement, osteoclast.

The differences of orthodontic tooth movement on menstrual and ovulation cycle

“…This opinion is in accordance with Sirisoontorn et al 3 research which revealed that lack of estrogen may increase the orthodontic tooth movement. That results is same as some previous studies such as Haruyama et al, 9 Ghajar et al, 10 and Olyaee et al, 11 which said that estrogen level inversely related to orthodontic tooth movement.…”

Does the rate of orthodontic tooth movement change during pregnancy and lactation? A systematic review of the evidence from animal studies

“…Two studies showed more movement in the pregnant animals [44,45] while no difference was observed in the third [43] (Fig. 2).…”

“…After the exclusion of one more paper because it involved animals with dietary calcium deficiency [42], four papers were considered eligible ( Fig. 1) [43][44][45][46].…”

“…The retrieved studies were published between 1991 and 2018 and investigated the influence of pregnancy [43][44][45] Human studies Case studies, cross-over studies, studies without a separate control group.…”

The Effect of Low-Level Laser Therapy on the Acceleration of Orthodontic Tooth Movement

“…These modifications in periodontal tissues result in bone remodeling, which is crucial for orthodontic tooth movement. [2][3][4] By now, many studies have investigated various ways of accelerating tooth movement, including injections of the drug, electric stimulation, corticotomy, pulsed electromagnetic fields, and mechanical and physical methods. 5,6 In clinical practice, low-level laser therapy (LLLT) is widely used.…”