Volume 5 Issue 1
A BULLETIN DEALING WITH ISSUES FOR DENTAL HEALTH
With health issues a major concern, it is important to work with
materials and manufacturers that have a similar focus. Brealloy C+B 270
manufactured by Bredent Germany was created specifically to eliminate
harmful elements that could be detrimental to patients, clinicians and
technicians. It is free from sensitive materials such as nickel,
beryllium and gallium. Brealloy is a biocompatible, chrome - cobalt -
molybdenum alloy suitable for ceramics, crowns, bridges and bar
restorations. It can be milled flawlessly on attachment techniques and
exhibits optimum precision in one piece casting procedures. Marginal
integrity is excellent and it has a Vickers Hardness of 270. Tap and
screw techniques can be easily carried out since it has the same
ductility and other properties of precious metals. The handling
characteristics of this alloy are within standards of practice. This
means that there are no changes to laboratory procedures. Recent dental
laboratory test results in Canada indicate excellent expansion
coefficient for 900 porcelain systems on single and long span
Thanks go to Mr. Andrew Sommers, R.D.T., owner of Classic Dental lab in
Woodbridge, Ontario who has tested Brealloy in his laboratory on actual
cases. The alloy conforms to DIN 13912 and DIN EN ISO 9693 quality
BREALLOY C & B 270
C & B 270 is a Co Cr Mo alloy free from nickel, beryllium and
gallium. It is ideal for ceramic to metal restorations on single and
long span bridges
Two studies on the evaluation of the corrosion stability
of non-precious metal alloys have been documented.
J.Geiis-Gersthofer; K.H.Sauer; H. Weber (in vitro corrosion study on
the material consumption of non-precious metal alloys 1986).
R. Strietzel; J.Viohl (determination of the invitro corrosion rates of
amalgams and dental alloys with the help of atomic abrasion
spectroscopy 1986). The Co Cr Mo alloys mentioned in the two text
sources above are almost within the range of gold casting alloys.
absence of elements with a highly allergenic potential such as nickel
and beryllium in the alloy makes Brealloy a suitable alternative to
high priced palladium alloys with similar properties.
To receive a free Brealloy
physical value and composition booklet call 1-800-250-5111 or
e-mail us at dent-line of canada
I have been using Bredent attachments in my laboratory for the past
year or two. Recently I have been experiencing problems. Let me
describe two. Maybe you can have a tech person advise me or call me
with a suggestion.
Problem 1: A female patient had teeth
6-11 crowned and splinted. Round bredent attachments were placed on the
distals of 6 and 11. Conventional female grooves were placed between
the canines and lateral incisors with the corresponding male
counterpart on the partial denture. After wearing this for
approximately one year the retention loosened. When the lab
the yellow attachments with red ones the partial no longer seated
without a handpiece adjustment to the bredent attachment on the
aspect (distal tooth # 11). What happened here? What went wrong?
Shouldn't the partial have reseated in its original position once the
new attachments were snapped into place by my laboratory?
Problem 2: Same
situation. Splinted crowns from 6-11 with female grooves between the
canines and laterals. Round bredent attachments distal to the canines.
In this case the metal male attachments that would slide in between the
canines and laterals broke off bilaterally. My question to you is not
how this happened (although I would be interested in your thoughts). My
question is if the partial needs to be redone and cannot be repaired...
how do I do this without redoing the accompanying crown and bridgework
from 6-11? Is it possible to take an impression and register an
accurate transfer of the round male attachments distal to the canines?
If so, how could I eliminate any alignment problems? I would appreciate
any help you would have to offer. Thank you, Dr. Jay A. Millar, 4249
Route 9 North Freehold N.J. USA.
Answer to problem 1:
Bredent recommends when a yellow female loses its retention it should
be replaced with a new yellow female. Red, the highest retention is
used when the replacement yellow cannot provide it. As for the poor
reseating there a few possibilities. The red females were not properly
seated in the housing because the original yellow was previously
adjusted to fit. Also after a year in the mouth it is normal for a
partial to need a reline at the time of the retention replacement.
Finally the male ball may not have worn down for the tighter red
female to seat all the way.
Answer to Problem 2:
The reciprocal or lingual arm may have broken from metal fatigue. It
would be difficult to determine the cause without an in depth
The dental lab should be able to make a new arm and weld it on to the
existing partial or a new partial could be fabricated. Whether you opt
to repair or fabricate a new partial, Bredent has metal transfer
analogues that will eliminate any
alignment problems. In any event you should not have to redo the
existing crown and bridge work.
Source: Peter T. Pontsa RDT
Product: Wax Palatines
Bredent's aesthetic and anatomically correct Wax Palatine Ridges are
designed to save time and money by simplifying the fabrication of full
palate dentures. The ridges are available in three different sizes and
each is available in 0.5 mm or 1.5 mm. Choose the correct size, then
simply press it down on the model to acquire the shape of the palate
and wax it to the setup. For more information, call 1-800-250-5111.
Finds Friendly Bacteria
Researchers at the Osaka University in Japan have found an active
ingredient in the cocoa bean husk which kills mouth bacteria and
prevents the formation of cavities. Scientist believe it may be
possible to put the cocoa bean extract into mouthwash or toothpaste or
even back into chocolate. At present, the husk generally goes to waste
during the production process of chocolate. The British Dental
Association's Education and Science Department said they look forward
to further research in this are but underline there isn't any benefit
from eating chocolate today because the cocoa bean husk is not used.
Source : Infodent; 22 Nov. 2000
We will be at Technoramma 2001 to be held April 6th & 7th at the
International Plaza Hotel. Toronto. Please drop by our booth to see the
new products. For information call 1-800-250-5111.
The Dent-Liner; Vol. 5, No. 1
Publisher: Peter T. Pontsa RDT
Editor: A. Van Breemen BA