Three-dimensional force systems from activated orthodontic appliances

2001 ◽  
Vol 7 (3) ◽  
pp. 207-214 ◽  
Author(s):  
Steven J. Lindauer ◽  
Robert J. Isaacson ◽  
A. Denis Brilto
Keyword(s):  
Three Dimensional ◽  
Orthodontic Appliances ◽  
Force Systems

scholarly journals Effect of apical portion of T-, sloped L-, and reversed L-closing loops on their force systems

2016 ◽  
Vol 87 (1) ◽  
pp. 104-110 ◽  
Author(s):  
Paiboon Techalertpaisarn ◽  
Antheunis Versluis
Keyword(s):  
Three Dimensional ◽  
Vertical Force ◽  
Element Analysis ◽  
Force System ◽  
Apical Portion ◽  
Beam Elements ◽  
Force Ratio ◽  
Force Systems ◽  
Three Dimensional Models ◽  
Apical Loop

ABSTRACT Objective: To investigate the effect of the position of the apical portion of closing loops on the force system at both loop ends. Materials and Methods: T-loops were compared with backward-sloped L-loops (SL) and reversed L-loops (RL). SL-loops were directed toward the anterior side; RL-loops were directed toward the posterior side. Loop response to loop pulling was determined with finite element analysis at six positions of the apical loop portion for 12-mm interbracket distance and 8-mm loop length and height. Three-dimensional models of the closing loops were created using beam elements with the properties of stainless steel. Loop responses (horizontal load/deflection, vertical force, and moment-to-force ratio) at both loop ends were calculated as well as at 100 g and 200 g activation forces. Results: T-, SL-, and RL-loops with the same position of the apical portion showed approximately the same force system at both loop ends. This behavior was found across the investigated range through which the loops were moved (interbracket center to posterior bracket). Conclusions: The center of the apical portion determined the force system of the closing loops regardless of the position of the loop legs. The centers of the apical portion of the T-, SL-, and RL-loops acted like V-bend positions.

scholarly journals Multifunctional Templates for Minimized Osteotomy, Implantation, and Palatal Distraction with a Mini-Screw-Assisted Expander in Schizodontism and Maxillary Deficit

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Manfred Nilius ◽  
Katrin Hess ◽  
Dominik Haim ◽  
Bernhard Weiland ◽  
Guenter Lauer
Keyword(s):  
Minimally Invasive ◽  
Three Dimensional ◽  
Young Patients ◽  
Growth Conditions ◽  
Interdisciplinary Treatment ◽  
Permanent Teeth ◽  
Orthodontic Appliances ◽  
Supernumerary Teeth ◽  
Dental Implantation ◽  
One Step

Purpose. Schizodontism is complete separation of a dental germ. It results in a twin tooth and supernumerary teeth. The treatment of transverse constriction in combination with supernumerary dental germs and impacted central incisors can pose a challenge, especially in young patients, when the number of permanent teeth is not adequate to ensure secure anchorage. The use of navigation templates based on three-dimensional X-ray images allows for precise insertion of temporary mini-implants for the acquisition of palatal distractors. In addition, templates allow for minimally invasive biopsies and osteotomies. Methods. The treatment of schizodontism, dentitio tarda, and transverse constriction is to be assessed as an interdisciplinary method by using mini-screw-assisted devices. Minimized osteotomy of impacted supernumerary teeth or dental implantation can be carried out in a one-step-procedure based on digital preplanning and prefabrication of orthodontic devices. Results. Multifunctional templates allow for early planning, preoperative fabrication, and intraoral fixation of orthodontic appliances. In the case of an adolescent patient, a sustainable, interdisciplinary treatment concept could be demonstrated that shows age-appropriate gnathological development and stable growth conditions over a follow-up period of 10 years. Conclusion. One can likely assume that multifunctional templates allow for minimally invasive one-step surgeries as an interdisciplinary tool between orofacial surgery and modern orthodontics.

Finite Element Analysis and Its Application in Oral Surgery Research

2010 ◽  
pp. 159-170
Author(s):  
Mercedes Gallas
Keyword(s):  
Finite Element ◽  
Oral Surgery ◽  
Three Dimensional ◽  
Element Analysis ◽  
Biomechanical Behavior ◽  
Force Systems ◽  
Surgery Research ◽  
Miniplate Osteosynthesis ◽  
Virtual Modeling ◽  
Regional Stresses

The Finite Element Method (FEM) is a widely applied mathematical model that permit us to know the biomechanical behavior of the human mandible in various clinical situations under physiological and standardized trauma conditions. The three-dimensional FEM provides to simulate force systems applied and allows analysis of the response of the jawbone to the loads in 3D space. Clinical extrapolations from FEM may not give absolute values but they will provide detailed description of biomechanical pattern and a prediction of regional stresses distribution. This virtual modeling is useful to choose the most efficient localization and design of miniplate osteosynthesis and to test new biomaterials.

Force Systems from Orthodontic Appliances: An Analytical and Experimental Comparison

1980 ◽  
Vol 102 (4) ◽  
pp. 294-300 ◽  
Author(s):  
H. A. Koenig ◽  
R. Vanderby ◽  
D. J. Solonche ◽  
C. J. Burstone
Keyword(s):  
Experimental Data ◽  
Computer Program ◽  
Entire Range ◽  
Experimental Methods ◽  
Interactive Design ◽  
Experimental Comparison ◽  
Orthodontic Appliances ◽  
Loading Conditions ◽  
Force Systems ◽  
Good Agreement

Experimental data is compared with the simulated displacements from a computer program for the clinical activations of two separate orthodontic appliances undergoing a total of four separate loading conditions. Good agreement is shown over the entire range of activation. Suggestions for future strengthening of both the analytical and the experimental methods are given. An interactive design graphics system is shown to be imminently available to the research orthodontist.

Force Generation From Orthodontic Appliances

1982 ◽  
Vol 104 (4) ◽  
pp. 280-289 ◽  
Author(s):  
R. Greif ◽  
M. Coltman ◽  
M. Gailus ◽  
E. Shapiro
Keyword(s):  
Computer Program ◽  
Geometric Nonlinearity ◽  
Laboratory Testing ◽  
Three Dimensional ◽  
Analytic Solutions ◽  
Force Generation ◽  
Orthodontic Appliances ◽  
Engineering Problems ◽  
Orthodontic Archwires

The design of orthodontic archwires often incorporates complex bends, loops and twists to generate force fields. The determination of the magnitude and direction of these forces requires the solution of three-dimensional problems of geometric nonlinearity. To solve these problems, a computer program is developed based on a combined incremental/iterative algorithm. The findings are verified by comparison with analytic solutions of nonlinear engineering problems, as well as by laboratory testing of orthodontic archwires.

scholarly journals Three-dimensional analysis of tooth movement after intrusion of a supraerupted molar using a mini-implant with partial-fixed orthodontic appliances

2012 ◽  
Vol 83 (2) ◽  
pp. 274-279 ◽  
Author(s):  
Shin-Jae Lee ◽  
Sook-Yun Jang ◽  
Youn-Sic Chun ◽  
Won Hee Lim
Keyword(s):  
Tooth Movement ◽  
Treatment Time ◽  
Three Dimensional ◽  
3D Models ◽  
Orthodontic Appliances ◽  
Scanning System ◽  
3D Analysis ◽  
Fixed Orthodontic Appliances ◽  
The Mean ◽  
3D Software

ABSTRACT Objective: To evaluate three-dimensional (3D) positional changes of an intruded tooth, a neighboring tooth, and a tooth connected to a mini-implant following intrusion of a single supraerupted molar, using a mini-implant with partial-fixed orthodontic appliances. Materials and Methods: The study consisted of 14 adult patients (two males and 12 females, mean age 41.9 years) with a supraerupted molar due to loss of an antagonist. Intrusion was performed using a mini-implant with a partial strap-up. The mean treatment time was 11.9 months, and the mean retention time was 23.3 months. To quantify the positional changes of the teeth, 3D models using a laser-based, dental scanning system and 3D software at pretreatment, posttreatment, and retention were oriented in a coordinate system and superimposed using nonmoved teeth as references. The changes on the x-, y-, and z-axes were measured at the tip of each cusp in the involved teeth. Results: A supraerupted molar was intruded by a mean amount of 1.35 ± 0.48 mm and was well maintained during the retention period. The overall change in the neighboring tooth was insignificant, although it showed opposite movement compared to the intruded tooth during the intrusion. The tooth connected to a mini-implant exhibited a secure anchorage. Conclusion: 3D analysis showed the detailed positional changes of each tooth, and the involved molars were well maintained after intrusion.

Smart Bracket for Multi-dimensional Force and Moment Measurement

2007 ◽  
Vol 86 (1) ◽  
pp. 73-78 ◽  
Author(s):  
B.G. Lapatki ◽  
J. Bartholomeyczik ◽  
P. Ruther ◽  
I.E. Jonas ◽  
O. Paul
Keyword(s):  
Tooth Movement ◽  
Methodological Approach ◽  
Three Dimensional ◽  
Three Dimensions ◽  
Orthodontic Appliances ◽  
Integrated Sensor ◽  
Orthodontic Bracket ◽  
Monitoring Tools ◽  
Fixed Orthodontic Appliances ◽  
Force Moment

Atraumatic, well-directed, and efficient tooth movement is interrelated with the therapeutic application of adequately dimensioned forces and moments in all three dimensions. The lack of appropriate monitoring tools inspired the development of an orthodontic bracket with an integrated microelectronic chip equipped with multiple piezoresistive stress sensors. Such a ‘smart bracket’ was constructed (scale of 2.5:1) and calibrated. To evaluate how accurately the integrated sensor system allowed for the quantitative determination of three-dimensional force-moment systems externally applied to the bracket, we exerted 396 different force-moment combinations with dimensions within usual therapeutic ranges (± 1.5 N and ± 15 Nmm). Comparison between the externally applied force-moment components and those reconstructed on the basis of the stress sensor signals revealed very good agreement, with standard deviations in the differences of 0.037 N and 0.985 Nmm, respectively. We conclude that our methodological approach is generally suitable for monitoring the relatively low forces and moments exerted on individual teeth with fixed orthodontic appliances.

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