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Biomedical subjects

C J Burstone

Publications and source records attributed to C J Burstone.

At least 73 records · Page 4Linked to original sources
PubMed1981

Flexure modulus of orthodontic stainless steel wires.

The flexure modulus of elasticity of standard stainless steel orthodontic wires was determined by the use of an iterative finite element technique to be 25.4 x 10(6) psi (175 x 10(3) MN/m2). This technique accounts for the configurational changes in the test specimens due to the relatively large deflection during the cantilever test. Under these conditions, the elementary strength of materials relationships does not accurately describe the flexure characteristics of the wires.

Dental Stress Analysis↗
PubMed1980

Beta titanium: a new orthodontic alloy.

Historically, few alloys have been used in the fabrication of orthodontic appliances. This article reviews the gold-based, stainless steel, chrome-cobalt-nickel, and nitinol alloys, as well as beta titanium, a new material for orthodontics. Mechanical properties and manipulative characteristics are summarized to develop a basis for the selection of the proper alloy for a given clinical situation. The beta titanium wire has a unique balance of low stiffness, high springback, formability, and weldability which indicates its use in a wide range of clinical applications. A number of such applications are described.

Alloys↗
PubMed1980

Holographic determination of centers of rotation produced by orthodontic forces.

A new tool for measuring tooth movement--laser holography--offers an accurate, noninvasive approach for determining movement in three dimensions. This in vitro study is designed to establish the required force system applied on the crown of a maxillary incisor that would produce different centers of rotation, as in lingual tipping, translation, and root movement. The relationship between moment-to-force ratios and centers of rotation is shown. The experimental data are compared to theoretic approaches. With respect to the location of the center of resistance and centers of rotation, force systems needed to produce different centers of rotation are given for a central incisor of average root length.

Biomechanical Phenomena↗
PubMed1980

Force systems from orthodontic appliances: an analytical and experimental comparison.

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.

Biomechanical Phenomena↗
PubMed1980

Soft tissue cephalometric analysis for orthognathic surgery.

A soft tissue cephalometric analysis designed for the patient who requires surgical-orthodontic car was developed to complement a previously reported dentoskeletal analysis. To make it clinically practical, the analysis has been reduced to its most relevant and significant measurements. Used along with other diagnostic aids, this soft tissue evaluation will enable the clinician to achieve good facial esthetics for his or her patients.

Adolescent↗
PubMed1979

An evaluation of beta titanium alloys for use in orthodontic appliances.

A beta titanium alloy was evaluated for use in orthodontic appliances. Standard mechanical tests and aspecially designed spring test were used. Two particular thermo-mechanical treatments resulted in titanium springs with 1.8 times the extension of comparable stainless steel springs, and a 2.2 fold reduction in force per unit displacement.

Dental Alloys↗
PubMed1979

The effect of time and force magnitude on orthodontic tooth movement.

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.

Adult↗
PubMed1978

Cephalometrics for orthognathic surgery.

A cephalometric analysis especially designed for the patient who requires maxillofacial surgery was developed to use landmarks and measurements that can be altered by common surgical procedures. Because measurements are primarily linear, they may be readily applied to prediction overlays and study cast mountings and may serve as a basis for the evaluation of posttreatment stability.

Adult↗
PubMed1977

Tip-back mechanics.

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Biomechanical Phenomena↗
PubMed1977

Reduction in the modulus of elasticity in orthodontic wires.

The modulus of elasticity of stainless steel orthodontic wires was found to be 20% below the normally assumed range of 19.3 to 20.0 x 10(4) MPa (28.0 to 29.0 x 10(6) psi). Use of the latter value can result in significant computational errors in orthodontic applicance mechanics. The lower modulus was attributed to severe cold drawing.

Crystallography↗
PubMed1977

The growth velocity prediction using the sampled-transfer-function.

The feasibility of using the sampled-transfer-function to predict the magnitude of peak velocity of human body height was investigated. A sampled-transfer-function for longitudinal growth data was established utilizing the input-output concept in system theory and the z-transform. A computer program was written to generate the predicted circumpubertal height velocities of an individual using his prepubertal height velocities as an input. The predicted results were compared with the actual results of 25 males selected from the Denver growth sample. The predicted magnitude of peak velocity for each individual using the transfer function was significantly better than the one using the mean valu

Age Factors↗