A comparison between friction and frictionless mechanics with a new typodont simulation system

Rhee, Joon-No; Chun, Youn-Sic; Row, Joon

doi:10.1067/mod.2001.112452

Cited by 44 publications

(34 citation statements)

References 31 publications

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“…The tipping tendency increased with the applied force magnitude, which may have been caused by deformation of the wire or an increase in the diameter of the tube. Furthermore, the effect of friction 22,23 on the sliding tube used in this study remains unclear. Further study is required to understand the orthodontic force magnitude actually loaded onto the tooth, types of tooth movement, and root resorption.…”

Section: Discussionmentioning

confidence: 99%

Effects of different types of tooth movement and force magnitudes on the amount of tooth movement and root resorption in rats

Nakano

Hotokezaka

Hashimoto

et al. 2014

The Angle Orthodontist

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Objective: To investigate differences in the amount of tooth movement and root resorption that occurred after tipping and bodily movement of the maxillary first molar in rats. Materials and Methods: Ten-week-old female Wistar rats were divided into two groups according to type of tooth movement and subdivided into four subgroups according to the magnitude of applied force. Nickel-titanium closed-coil springs exerting forces of 10, 25, 50, or 100 g were applied to the maxillary left first molars to induce mesial tooth movement. We designed a novel orthodontic appliance for bodily tooth movement. Tooth movement distance and root resorption were measured using microcomputed tomography and scanning electron and scanning laser microscopy. Results: The amount of tooth movement in the bodily tooth movement group was less than half that in the tipping tooth movement group. The greatest amount of tooth movement occurred in the 10-g tipping and 50-g bodily tooth movement subgroups, and the amount of tooth movement decreased with the application of an excessive magnitude of force. Conversely, root resorption increased when the heavier orthodontic force was applied in both groups. Root resorption in the tipping tooth movement group was approximately twice that in the bodily tooth movement group. Conclusions: Root resorption in the tipping tooth movement group was more pronounced than that in the bodily tooth movement group. Although the amount of tooth movement decreased when extremely heavy forces were applied, root resorption increased in both the tipping and bodily tooth movement groups in rats.

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Section: Discussionmentioning

confidence: 99%

Effects of different types of tooth movement and force magnitudes on the amount of tooth movement and root resorption in rats

Nakano

Hotokezaka

Hashimoto

et al. 2014

The Angle Orthodontist

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“…The test setup (Figures 1a and 1b) comprised the following components: artificial maxilla of pressurized polymer with ten rigidly-fixed teeth as anchorage unit, two electrothermodynamic molars [14,25] set in artificial alveolar ridges of Kerr wax (Kerr Corp., Orange, CA, USA), electronic measuring unit for thermal control and regulation [14,25], senEinleitung Im Rahmen einer kieferorthopädischen Behandlung ist häufig die Distalisation der Oberkiefermolaren zur Verbesserung der Platzverhältnisse innerhalb des oberen Zahnbogens und/oder zur Korrektur von Distalverzahnungen indiziert, wenn eine Extraktionstherapie vermieden werden soll. Seit Ende der 1970er Jahre wurden vielfältige Behandlungsmethoden und -apparaturen zur kooperationsunabhängigen Molarendistalisation beschrieben.…”

Section: Methodsunclassified

Biomechanics of the Keles Slider Appliance for Maxillary Molar Distalization – In-vitro Analysis of Force Systems

Kinzinger

Diedrich

2008

J Orofac Orthop

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The Keles Slider nearly achieves translatory molar distalization on a typodont in the sagittal plane. As a result, no uprighting activation is necessary for treatment. Because force application occurs palatally from the molars' center of resistance, there is a mesial-inward rotating moment that increases as distalization progresses, and this may lead to unwanted friction during clinical application. This is why regular reactivation of the coil spring systems, as well as subsequent measures for molar derotation, are indispensable. In the vertical plane, the molars are exposed to weak extrusive forces combined with moderate buccal rotating moments. These effects confirm that this appliance is indicated in patients with deep overbite.

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“…The test set-up (Figures 1a and 1b) was based on the following components: • artificial maxilla with ten teeth forming the anchorage unit and two electrothermodynamic (ETD) molars [27], • electronic measuring unit for temperature control and regulation [27], • sensor unit with force-moment sensor, analog/digital converter and data readout unit [8,9,28].…”

Section: Measuring Principlementioning

confidence: 99%

Molar Distalization with Different Pendulum Appliances: In Vitro Registration of Orthodontic Forces and Moments in the Initial Phase

et al. 2004

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The effects shown by the standard pendulum appliance and the M-pendulum over a 3 mm simulated distalization increment were a marked decrease in the distally directed forces, and an increase in the intrusive and palatally directed forces as well as in the distoinclinatory, mesially inward, and palatally rotating moments. Activations in the U-loop region of the pendulum springs induced an increase in distally and buccally directed forces and in uprighting and buccally rotating moments as well as a marked rise in extrusive forces. Whereas the activation described by Hilgers led to mesially outward rotating moments, activation according to Scuzzo resulted in a further increase in the mesially inward rotating moments. In the measured standard pendulum appliances, uprighting activation at the end of the pendulum according to Byloff led to an increase in distally and buccally directed as well as in mildly intrusive forces, and to an increase in uprighting as well as in buccally and mesially outward rotating moments. With the Pendulum K according to Kinzinger, the initial toe-in bend and uprighting activation in the region of the end of the pendulum spring together with regular adjustment of the incorporated distal screw permitted virtually translatory molar distalization: constantly distalizing forces with slight intrusive, buccally directed, and rotating side effects.

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A comparison between friction and frictionless mechanics with a new typodont simulation system

Cited by 44 publications

References 31 publications

Effects of different types of tooth movement and force magnitudes on the amount of tooth movement and root resorption in rats

Effects of different types of tooth movement and force magnitudes on the amount of tooth movement and root resorption in rats

Biomechanics of the Keles Slider Appliance for Maxillary Molar Distalization – In-vitro Analysis of Force Systems

Molar Distalization with Different Pendulum Appliances: In Vitro Registration of Orthodontic Forces and Moments in the Initial Phase

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