BREALLOY C & B 270	Brealloy 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.

(1)  J.Geiis-Gersthofer; K.H.Sauer; H. Weber (in vitro corrosion study on the material consumption of non-precious metal alloys 1986).

(2)  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. The 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 inc.

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 replaced the yellow attachments with red ones the partial no longer seated without a  handpiece adjustment to the bredent attachment on the buccal 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.

Answers:
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 analysis 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