Force-Distance Relation for Dental Magnets - Fitted Equation.
Eur J Prosthodont Restor Dent
; 31(2): 126-144, 2023 May 31.
Article
in En
| MEDLINE
| ID: mdl-36006004
ABSTRACT
OBJECTIVE:
The force-distance power law for dental magnets had been unresolved until a theoretical study found that only even inverse powers were allowed; for simple magnets inverse fourth power was the only possibility. It remained to demonstrate that this indeed did apply to real magnets, the present purpose.METHODS:
The force exerted by a series of real dental magnets to a large steel plate, and in a few cases to dental magnet keepers, as a function of distance was recorded. Curve-fitting of that data was explored. using the equation previously used for long dipoles, but allowing the power to be a free parameter. An index of 4 was the only feasible value. Corresponding fitted parameter values were then examined in relation to magnet design and each other.RESULTS:
The theoretical power law index was confirmed to be 4. For a satisfactory fit, a 'polar offset' and a 'stretch power' were again required to better approximate the experimental results. Polar offset appears to be a function of apparent pole strength; stretch power less clearly so.SIGNIFICANCE:
The motivating question is settled.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Magnets
/
Magnetics
Language:
En
Journal:
Eur J Prosthodont Restor Dent
Journal subject:
ODONTOLOGIA
Year:
2023
Document type:
Article
Affiliation country:
United kingdom
Publication country:
ENGLAND
/
ESCOCIA
/
GB
/
GREAT BRITAIN
/
INGLATERRA
/
REINO UNIDO
/
SCOTLAND
/
UK
/
UNITED KINGDOM