scholarly journals Will similar force magnitude cause differential tooth movement?

2017 ◽  
Vol 152 (3) ◽  
pp. 292-293
Author(s):  
Gargi Sivadasan ◽  
Arun. S. Urala ◽  
Kalyana Pentapati
Keyword(s):  
Tooth Movement ◽  
Force Magnitude ◽  
Similar Force

scholarly journals Force Magnitude and Duration Effects on Amount of Tooth Movement and Root Resorption in the Rat Molar

2008 ◽  
Vol 78 (3) ◽  
pp. 502-509 ◽  
Author(s):  
Carmen Gonzales ◽  
Hitoshi Hotokezaka ◽  
Masako Yoshimatsu ◽  
Joseph H. Yozgatian ◽  
M. Ali Darendeliler ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Tooth Movement ◽  
Root Resorption ◽  
Three Dimensional ◽  
Nickel Titanium ◽  
Second Molar ◽  
Force Application ◽  
Surface Areas ◽  
Force Magnitude ◽  
Group A

Abstract Objective: To test the hypothesis that there is no difference in the effect of different continuous moderate to very heavy forces on root resorption or amount of tooth movement. Materials and Methods: In the study, 10, 25, 50 and 100 g mesial force were applied to the maxillary first molars of rat using nickel titanium closed-coil springs for 3 days, 14 days, and 28 days. The molars were extracted and the surface areas of the root resorption craters were measured using scanning electron microscope. The depths of the root resorption craters were measured using a three-dimensional laser scanning microscope. Tooth movement of the maxillary first molar was measured in relation to the maxillary second molar on digitized lateral cephalometric radiographs. Results: Three days after force application, the tooth movement was not proportionally related to force magnitude. However, 14 days of force application resulted in significantly more tooth movement in the 10, 25, and 50 g force groups than in the 100 g force group. A force application of 10 g produced significantly more tooth movement at 28 days than all the other three force applications. The largest and deepest resorption craters were observed in the disto-buccal root followed by disto-palatal, middle-buccal, middle-palatal, and mesial root. Root resorption and tooth movement increased over time from 3 to 28 days. As heavier forces were applied, greater root resorption occurred. Conclusion: The hypothesis is rejected. The light mesially oriented forces, as applied in this study, produced more tooth movement and less root resorption compared with heavier forces.

Rate of orthodontic tooth movement after changing the force magnitude: an experimental study in beagle dogs

2010 ◽  
Vol 13 (4) ◽  
pp. 238-245 ◽  
Author(s):  
EJ Van Leeuwen ◽  
AM Kuijpers-Jagtman ◽  
JW Von den Hoff ◽  
FADTG Wagener ◽  
JC Maltha
Keyword(s):  
Experimental Study ◽  
Tooth Movement ◽  
Orthodontic Tooth Movement ◽  
Beagle Dogs ◽  
Force Magnitude

scholarly journals Orthodontic Buccal Tooth Movement by Nickel-Free Titanium-Based Shape Memory and Superelastic Alloy Wire

2006 ◽  
Vol 76 (6) ◽  
pp. 1041-1046 ◽  
Author(s):  
Akihiro Suzuki ◽  
Hiroyasu Kanetaka ◽  
Yoshinaka Shimizu ◽  
Ryo Tomizuka ◽  
Hideki Hosoda ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shape Memory ◽  
Tooth Movement ◽  
Orthodontic Tooth Movement ◽  
Nickel Titanium ◽  
Alloy Wire ◽  
Force Magnitude ◽  
Niobium Aluminum ◽  
Initial Force ◽  
Continuous Progression

Abstract Objective: To examine the mechanical properties and the usefulness of titanium-niobium-aluminum (Ti-Nb-Al) wire in orthodontic tooth movement as compared with nickel-titanium (Ni-Ti) wire. Materials and Methods: The load deflection of expansion springs was gauged with an original jig. The gradient of the superelastic region was measured during the unloading process. Expansion springs comprising the two types of alloy wires were applied to upper first molars of rats. The distance between the first molars was measured with micrometer calipers. Results: The force magnitude of the Ti-Nb-Al expansion spring was lower than that of the Ni-Ti expansion spring over the entire deflection range. The initial force magnitude and the gradient in the superelastic region of the Ti-Nb-Al expansion springs were half those of the Ni-Ti expansion springs. Thus, Ti-Nb-Al expansion springs generated lighter and more continuous force. Tooth movement in the Ni-Ti group proceeded in a stepwise fashion. On the other hand, tooth movement in the Ti-Nb-Al group showed relatively smooth and continuous progression. At 17 days after insertion of expansion springs, there were no significant differences between the Ti-Nb-Al and Ni-Ti groups in the amount of tooth movement. Conclusions: These results indicate that Ti-Nb-Al wire has excellent mechanical properties for smooth, continuous tooth movement and suggest that Ti-Nb-Al wire may be used as a practical nickel-free shape memory and superelastic alloy wire for orthodontic treatment as a substitute for Ni-Ti wire.

Theoretical Considerations of Headgear Therapy: A Literature Review

1978 ◽  
Vol 5 (3) ◽  
pp. 145-152 ◽  
Author(s):  
D. E. J. Bowden
Keyword(s):  
Literature Review ◽  
Clinical Research ◽  
Clinical Response ◽  
Tooth Movement ◽  
Theoretical Concepts ◽  
Force Magnitude ◽  
Theoretical Considerations

The literature of headgear therapy is reviewed and used to explain some of the theoretical mechanical principles of tooth movement and anchorage control achieved by this method. Part 1, Mechanical Principles, is a review of force directions, centres of rotation, force magnitude and duration. In Part 2, Clinical Response and Usage, the clinical uses of different directions of force are examined. Some of the clinical research into the changes produced by different headgears is described. An attempt is made to draw conclusions from the theoretical concepts discussed which may be of aid to the clinician.

The Effect of Time and Force Magnitude on Orthodontic Tooth Movement

1979 ◽  
Vol 58 (8) ◽  
pp. 1754-1764 ◽  
Author(s):  
Ryszard J. Pryputniewicz ◽  
Charles J. Burstone
Keyword(s):  
Tooth Movement ◽  
Three Dimensional ◽  
Orthodontic Tooth Movement ◽  
Applied Force ◽  
Experimental Results ◽  
Three Dimensions ◽  
Human Teeth ◽  
Force System ◽  
Force Magnitude

The holographic technique, recently developed for precise and accurate measurement of tooth displacements, was used to study the three-dimensional motion of human teeth. Maxillary central incisors were loaded with forces of 300 grams and 500 grams. Translations and rotations in three-dimensions were measured over 45 seconds. The experimental results, presented as a function of time, indicate that the instantaneous centers of rotation can be represented by space centrodes that are characteristic for each patient and the applied force system.

scholarly journals Types of tooth movement, bodily or tipping, do not affect the displacement of the tooth's center of resistance but do affect the alveolar bone resorption

2017 ◽  
Vol 87 (4) ◽  
pp. 563-569 ◽  
Author(s):  
Takanobu Kondo ◽  
Hitoshi Hotokezaka ◽  
Ryo Hamanaka ◽  
Megumi Hashimoto ◽  
Takako Nakano-Tajima ◽  
...  
Keyword(s):  
Bone Resorption ◽  
Alveolar Bone ◽  
Tooth Movement ◽  
Micro Ct ◽  
Micro Computed Tomography ◽  
Bodily Movement ◽  
Force Magnitude ◽  
Significant Difference ◽  
Movement Group ◽  
Center Of Resistance

ABSTRACT Objective: To investigate how types of tooth movement, bodily or tipping, influence the displacement of the center of resistance in teeth and alveolar bone resorption. Materials and Methods: Ten-week-old female Wistar rats were divided into eight groups of different factors, as follows: type of movement (bodily and tipping) and force magnitude (10, 25, 50, and 100 cN). The maxillary left first molars were moved mesially with nickel-titanium coil springs for 28 days. Micro–computed tomography (micro-CT) images were taken before and after tooth movement. The position of the center of resistance was determined by using finite element models constructed from the micro-CT image. The displacement of the center of resistance and the volume of alveolar bone resorption were measured. Results: The displacement of the center of resistance showed no significant difference between the bodily and tipping groups. The displacements of the center of resistance were increased with force magnitude at 10 and 25 cN, whereas they were not further increased at 50 and 100 cN. On the other hand, cervical alveolar bone resorption was significantly greater in the tipping group than in the bodily group. Conclusions: Displacement of the center of resistance was not influenced by the types of tooth movement. However, volume of cervical alveolar bone resorption was greater in the tipping movement group than in the bodily movement group.

scholarly journals Trigeminal Expression of N-Methyl-D-Aspartate Receptor Subunit 1 and Behavior Responses to Experimental Tooth Movement in Rats

2009 ◽  
Vol 79 (5) ◽  
pp. 951-957 ◽  
Author(s):  
Zhi Yang ◽  
Yan Wang ◽  
Wei Luo ◽  
Xiaochuan Hua ◽  
Peter Wamalwa ◽  
...  
Keyword(s):  
Nmda Receptor ◽  
Nmda Receptors ◽  
Receptor Antagonist ◽  
Tooth Movement ◽  
Movement Time ◽  
Nmda Receptor Antagonist ◽  
Mk 801 ◽  
Nocifensive Behavior ◽  
Force Magnitude ◽  
Experimental Tooth Movement

Abstract Objective: To test the hypothesis that peripheral N-methyl-D-aspartate (NMDA) receptors play a role in pain induced by experimental tooth movement. Materials and Methods: Male Sprague-Dawley rats weighing between 200 g and 300 g were used in this study. Expression of NMDA receptors subunit 1 (NMDAR1) in the mandibular portion of the trigeminal ganglion (TG) was determined by Western blotting 4 hours and 1, 2, 3, 5, 7, and 14 days after tooth movement. Changes in the time taken by the rats on nocifensive behavior then effects of NMDA receptor antagonist MK-801 and force magnitude on these changes in behavior and NMDAR1 expression were evaluated. Results: Experimental tooth movement led to a statistically significant increase in NMDAR1 expression at protein level from day 1 to 7 after force application initiating tooth movement. Time spent on nocifensive behavior dramatically increased from day 1 to 7. The rhythm in NMDAR1 expression in the TG and behavioral activities correlated well with the initial orthodontic pain responses. The magnitude of the nocifensive behavior and NMDAR1 expression were both force magnitude dependent and could be reduced by peripheral NMDA receptor antagonist MK-801. Conclusions: The hypothesis is accepted. Peripheral NMDA receptors are modulated by experimental tooth movement and involved in the development of tooth movement pain.

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