Retentive characteristics of different magnetic systems for dental applications

Highton, R.; Caputo, Angelo A.; Pezzoli, M; Matyas, J.

doi:10.1016/0022-3913(86)90291-x

Cited by 32 publications

(11 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For custom-made keepers, a much greater mass is possible than for pre-formed types. Bars, plates, and even crowns of the castable alloy have been proposed for use in the mouth, with no provision for removal by the patient or dentist (Ampil, Wegmann & Gambrell, 1986;Pezzoli et al, 1986). In such cases the volume of the metal could reach 1 cm^ or more.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

A potential MRI hazard: forces on dental magnet keepers

Gegauff

Laurell

Thavendrarajah

et al. 1990

J of Oral Rehabilitation

View full text Add to dashboard Cite

The objective of this study was to determine the forces on dental prosthetic magnet keepers, with a view to assessing the potential for patient injury during magnetic resonance imaging (MRI). Four pre-formed keepers and one castable keeper alloy were tested. Magnetizations and high field susceptibilities were determined for each of the five specimens using data from a vibrating sample magnetometer. The magnetic field intensity with respect to distance from the main magnet coil was obtained from the manufacturer (1-5 tesla General Electric Signa Imaging System). A plot of force versus distance from the main coil and the maximum force at the magnet portal was determined for each specimen. The maximum forces ranged from 0.12-0.24 N for the pre-formed keepers and 3.67 MNm-3 for the castable alloy. It was concluded that the risk of patient injury by displacement is minimal, if the keepers are properly attached to supporting structures.

show abstract

Section: Discussionmentioning

confidence: 99%

“…Magnet systems have received considerable attention in the dental literature, in the form of numerous scholarly papers (Carlyle et al, 1986;Highton et al, 1986; Parel A . G .…”

Section: Introductionmentioning

confidence: 99%

A potential MRI hazard: forces on dental magnet keepers

Gegauff

Laurell

Thavendrarajah

et al. 1990

J of Oral Rehabilitation

View full text Add to dashboard Cite

show abstract

“…They have high attractive forces in very small sizes, but have low corrosion resistance. 9 Tsutsui H et al found Samarium-Cobalt magnet to be superior in magnetic properties to other magnets. 10 Grant GT et al (2001) described a procedure for the fabrication of an extraoral prosthesis with an acrylic resin substructure that retains a magnet sealed from the environment by a polyurethane liner.…”

Section: Magnetsmentioning

confidence: 99%

The Changing Concepts in the Retention of Maxillofacial Prosthesis From Past to Present- A Review

Kanathila¹,

Pangi²

2017

jemds

View full text Add to dashboard Cite

BACKGROUNDDefects in the maxillofacial region can be congenital or acquired, both always makes an individual depressed, hence requires rehabilitation. Maxillofacial prosthesis helps in replacing the congenitally missing or lost body part due to trauma. From the past, the fitting and attachment of the prosthesis to the patient continues to be a great challenging factor, which needs improvement. Margins are difficult to mask even with the best materials. Large prostheses of most of the materials are too heavy and poorly retained. Retention plays a very important role in retaining the prostheses and thereby increasing patient's comfort and confidence. Using ideal retentive aids along with the aesthetic, functional and economic factors helps in achieving successful outcome.

show abstract

“…However, the use of such magnetic materials in dental applications has been discontinued for a long time owing to their poor performance. Since the introduction of rare earth magnets such as Sm-Co and Nd-Fe-B alloys, it has become possible to produce magnets with small dimensions and strong attraction force for dental treatment (MOGHADAM and SCANDRETT, 1979;LAIRD et aL, 1981;GILLING, 1981;1983;PEZZOLI et al, 1986;HIGHTON et al, 1986;RILEY et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Natural frequency assessment of stability of root keeper magnetic devices

Huang

Liu

Shiau

et al. 2004

Med. Biol. Eng. Comput.

View full text Add to dashboard Cite

The aim of the study was to evaluate the potential for using natural frequency (NF) as an indicator for assessing the stability of a magnetic keeper device used in prosthodontic treatment. A three-dimensional finite element (FE) model of a root keeper-cement-dentine system was established for NF analysis. The model was first validated against a series of in vitro experiments. Then, NF values of the first vibrational mode of the FE model with various boundary conditions were calculated. The in vitro results showed that the measured NF values of the root keeper-incisor units decreased significantly (p<0.01) from 9.07 +/- 0.37 to 5.73 +/- 0.10 kHz when the units were embedded in simulated bony tissue. Results obtained from FE simulations demonstrated that the root keeper would fully loosen when the constant values of the spring elements were lower than 10(4) N-m(-1). Furthermore, a linear increase in the NF values of the model was observed from 6.16 to 15.52 kHz, when the constant was increased from 10(4) to 10(7) N-m(-1), and the values then reached a plateau. The results indicate that the NF value of a root keeper has the potential to be used for monitoring the stability of such a device.

show abstract

Retentive characteristics of different magnetic systems for dental applications

Cited by 32 publications

References 9 publications

A potential MRI hazard: forces on dental magnet keepers

A potential MRI hazard: forces on dental magnet keepers

The Changing Concepts in the Retention of Maxillofacial Prosthesis From Past to Present- A Review

Natural frequency assessment of stability of root keeper magnetic devices

Contact Info

Product

Resources

About