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- 저자 : Nicola Beindorff (검색결과 2 건)
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Impact of piezocision on orthodontic tooth movement
Nikolaos Papadopoulos,Nicola Beindorff,Stefan Hoffmann,Paul-Georg Jost-Brinkmann,Thomas Michael Prager 대한치과교정학회 2021 대한치과교정학회지 Vol.51 No.6
Objective: This study investigated the impact of a single piezocision in the maxillary alveolar process on the speed of tooth movement. The null hypothesis was that the speed of tooth movement will be equal with and without piezocision. Methods: All maxillary molars on one side were moved against the combined incisors in 10 ten-week-old male Wistar rats. Under general anesthesia, a force of 25 cN was applied on either side using a Sentalloy closed coil spring. After placing the orthodontic appliance, vertical corticision was performed using a piezotome under local anesthesia, 2 mm mesial from the mesial root of the first molar on a randomly selected side; the other side served as the control. At the beginning of the treatment, and 2 and 4 weeks later, skull micro-computed tomography was performed. After image reconstruction, the distance between the mesial root of the first molar and the incisive canal, and the length of the mesial root of the first maxillary molar were measured. Moreover, the root resorption score was determined as described by Lu et al. Results: Significantly higher speed of tooth movement was observed on the corticision side; thus, the null hypothesis was rejected. The loss of root length and root resorption score were significantly more pronounced after piezocision than before. A strong correlation was observed between the speed of tooth movement and root resorption on the surgical side, but the control side only showed a weak correlation. Conclusions: Piezocision accelerates orthodontic tooth movement and causes increased root resorption.
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Annette Forro,Georgios Tsousis,Nicola Beindorff,Ahmad Reza Sharifi,Christos Brozos,Heinrich Bollwein 대한수의학회 2015 Journal of Veterinary Science Vol.16 No.1
The objective of this study was to investigate factors that influence the success of resynchronization protocols for bovines with and withoutprogesterone supplementation. Cow synchronized and not found pregnant were randomly assigned to two resynchronization protocols:ovsynch without progesterone (P4) supplementation (n = 66) or with exogenous P4 administered from Days 0 to 7 (n = 67). Progesteronelevels were measured on Days 0 and 7 of these protocols as well as 4 and 5 days post-insemination. Progesterone supplementation raised theP4 levels on Day 7 (p < 0.05), but had no overall effect on resynchronization rates (RRs) or pregnancy per artificial insemination (P/AI). However, cows with Body Condition Score (BCS) > 3.5 had increased P/AI values while cows with BCS < 2.75 had decreased P/AI ratesafter P4 supplementation. Primiparous cows had higher P4 values on Day 7 than pluriparous animals (p = 0.04) and tended to have higherRRs (p = 0.06). Results of this study indicate that progesterone supplementation in resynchronization protocols has minimal effects onoutcomes. Parity had an effect on the levels of circulating progesterone at initiation of the protocol, which in turn influenced the RR.
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