The Journal of Prosthetic Dentistry

Our medical research library holds 9 studies published in The Journal of Prosthetic Dentistry (1976–1995). Each entry links to the study's record on PubMed and, where there is one, to the publisher's page and a free full text. 7 have an abstract, the authors' own summary as PubMed records it: open "Abstract" to read it. For 2 studies PubMed has no abstract for, we give the abstract printed in the article or, where there is none, a summary we wrote from it, each labeled as such.

About the journal

• Publisher: Mosby-Year Book
• Published: 1951 to the present, United States
• Language: English
• ISSN: 0022-3913 (print), 1097-6841 (electronic)
• Its record in the NLM Catalog

1990s

• Release of asbestos fibers during casting ring liner manipulation. D.R. Davis. 1995;74(3):294-8. PubMed · Publisher

  Abstract

  Civil lawsuits have been filed that allege wrongful deaths of at least one dentist and one dental technician from asbestos exposure. However, no known published scientific studies support such allegations. To assess what potential exposure could occur, air samples were collected while casting rings were lined with asbestos liner. Fibers were collected on filters and counted by use of phase-contrast microscopy and transmission electron microscopy. The concentrations of fibers 5 microns long or greater on all filters was less than allowed by federal guidelines. Based on this simulation the potential health risk from using asbestos ring liner seems low.

• A procedure for restoring proximal contact surfaces of cast gold restorations with solder. P.M. Kimondollo. 1991;66(3):408-9. PubMed · Publisher

  Abstract

  Faulty contacts on restorations can be very damaging to the patient's dentition. Occasionally they are not corrected on a new restoration because of the length of time required for the procedure. The method described here is fast, simple, and protects the occlusal surfaces and margins of the restorations from damage while adding to the contacts with solder.

• Fabrication of one-piece hollow obturators. A. Jhanji, S.T. Stevens. 1991;66(1):136-8. PubMed · Publisher

  Abstract

  This technique is a controlled process in which the thickness of the obturator can be easily modified by adding to or shaving off the dimensionally stable silicone putty. All phases of the obturator fabrication are heat-cured and not autopolymerized, thus negating the disadvantages of other techniques. The technique provides more predictable results in obturator fabrication as it uses silicone putty as the obturating material as opposed to sugar, asbestos, or other silicone rubber foams that can be messy, dangerous, and unstable. This technique can also be used for patients with atrophic maxillae where the hollow denture can significantly reduce the weight of the restoration.

1980s

• An investigation of the potential biohazards associated with asbestos-substitute casting ring liners. G.J. Tulachka, W.A. Brantley, G.P. McGivney, et al. 1987;57(1):108-12. PubMed · Publisher

  Summary

  This laboratory study, from Marquette University School of Dentistry in Milwaukee, examined whether ceramic casting ring liners used as asbestos substitutes in dentistry release airborne fibers of a size considered hazardous. It also compared them with asbestos liners. Three brands of ceramic liner were tested: Kaoliner, used dry, and R-Liner and Ney-Liner, used wet. Asbestos liners, used wet, served as the control. To simulate daily dental laboratory use, strips of liner were adapted by finger pressure to five casting rings. The rings were filled with investment, burned out, water-quenched and broken apart. No metal was cast. Air was sampled during baseline, liner placement and break-out with two area pumps (8 hours each) and one personal pump (1 hour), giving eight samples per liner. Fibers were counted by optical microscopy using OSHA asbestos counting rules. Fiber-containing samples were examined by scanning electron microscopy (SEM) with elemental analysis. All four liners produced fibers, but every sample was below the detection level, at less than 0.01 fibers/cc. This compared with the OSHA permissible exposure limit of 2 F/cc and a proposed limit of 0.5 F/cc. The dry Kaoliner produced the most fibers, and most fibers were collected during liner placement. Ceramic fibers seen by SEM measured about 50 to 80 µm long and 1 to 1.5 µm in diameter, within the size range of greatest health concern. The authors concluded that ceramic ring liners should be considered potential biohazards, along with asbestos liners.

  PubMed has no abstract for this study, and the article doesn't print one. We wrote this summary from the full article with the help of AI. It is not the authors' wording.

• Potential health hazards of ceramic ring lining material. D.R. Davis. 1987;57(3):362-9. PubMed · Publisher

  Summary

  This pilot study asked whether ceramic ring lining materials, introduced in dentistry and industry as asbestos substitutes, contain fibers in the size ranges reported to cause mesothelioma in rats. Two ceramic liners, Kaoliner (Dentsply) and Kerr flask liner (Sybron Kerr), were examined. For comparison, the author used reference samples of South African blue asbestos (crocidolite) and brown asbestos (amosite) from the California Academy of Sciences, and two dental asbestos samples identified by morphology as white asbestos (chrysotile). Fibers were obtained from the liners either by cutting and scraping them over distilled water or by extracting the binder with chloroform. The fibers were then filtered, gold-coated, and viewed and measured by scanning electron microscopy at about x5000. A control sample was also run. Fibers in the dimensional ranges most toxic to rats were found in both ceramic liners. Extracting the binder yielded many more small-diameter fibers than scraping. Measured ceramic fibers included one of 11.8 µm length and 0.20 µm diameter (aspect ratio 59). The control showed no fibers. The ceramic fibers resembled the straight fibers of blue and brown asbestos rather than the curly white asbestos fibers, which could not be measured reliably. The author concluded that, until inhalation studies and human epidemiologic data are available, ceramic ring lining material should be considered potentially hazardous. Present evidence does not support the claim that it is safer than white asbestos ring liners.

  PubMed has no abstract for this study, and the article doesn't print one. We wrote this summary from the full article with the help of AI. It is not the authors' wording.

• The accuracy of occlusal cusp height in cast crowns. J. Takahashi, M. Okazaki, H. Kimura, et al. 1983;50(3):392-8. PubMed · Publisher

  Abstract

  Despite a good fit at the finish line, the occlusal cusp height decreased about 80 micron in gypsum-bonded cristobalite investments and increased about 40 micron in phosphate-bonded investments. Disks, tested as simulated occlusal portions of cast crowns, produced similar dimensional changes. This finding suggests that the occlusal cusp height is closely related to the thickness of the disk. An asbestos liner used with a gypsum-bonded investment failed to furnish adequate cushioning. The Kaowool liner provided good accuracy to the occlusal portion and finish line of cast complete crowns.

• Fibrous ceramic aluminum silicate as an alternative to asbestos liners. G. Priest, J.A. Horner. 1980;44(1):51-6. PubMed · Publisher

  Abstract

  The actual risk to those exposed to asbestos fibers in the dental laboratory is presently unknown. The ADA Council on Dental Materials and Devices and ADA Council on Dental Therapeutics have received encouragement from the National Institute for Occupational Safety and Health to conduct further studies, including monitoring airborne asbestos in dental laboratories. It has been suggested that no really safe threshold limit exists for airborne asbestos fibers. Low level asbestos exposure has been implicated in numerous serious diseases. Exposures as brief as 1 month have produced disease many years later. Numerous researchers have advocated the use of a safer material. Casting ring liners compound of currently available fibrous ceramic aluminum silicate are technically adequate substitutes for asbestos.

1970s

• Open-cast technique for metal molds used in constructing facial prostheses. O.N. Guerra, K. Canada. 1976;36(4):421-5. PubMed · Publisher

  Abstract

  A new (open-cast) technique for the fabrication of metal molds has been presented. Its simplicity relies on the use of gummed asbestos tape as a boxing agent for the investment models. This technique has the following advantages over the "lost wax" technique: (1) it requires approximately one-quarter the amount of investment material, (2) it eliminates the use of investing rings or wax patterns, (3) it eliminates the boil-out step for the wax pattern and reduces the total time required to make a metal mold, and (4) it affords a high degree of visibility. The only disadvantage is that the larger prostheses require large amounts of Lino-type metal which is very heavy. However, this has not restricted the use of this technique since these metals cast well and can be easily placed in large ovens. This technique, because of its advantages, offers more efficient use of laboratory time and personnel.

• The bonding properties of elastomer tray adhesives. G.B. Davis, J.B. Moser, G.I. Brinsden. 1976;36(3):278-85. PubMed · Publisher

  Abstract

  1. The surface yielded by the acrylic resin formed against tinfoil provided better retention for the rubber base than any other surface tested. 2. Wax consistently gave the worst results in spite of careful boiling out. 3. The use of wax or asbestos spacers would not degrade the resin surface if tinfoil, or presumably the more easily obtainable aluminum foil, were used as a separating medium. 4. For drying times of between 15 minutes and 72 hours, no significant change was found in bond strength of elastomer to tray material. 5. Drying times of less than 15 minutes were found to be inadequate and to decrease bond strength; they are clinically inadvisable. 6. If, as a result of unavoidable delay, a tray is painted and then left for a number of days prior to making the impression, satisfactory bonding will still occur. However, if the dentist wishes to apply a second coat and dry it for 15 minutes, an increase in bond strength is likely to occur. 7. In the six systems tested, failure occurred at varied levels, from a low of 20 p.s.i. to a high of 80 p.s.i. 8. In the silicone and polyether systems, cohesive failure of the elastomer occurred before the adhesive bond between elastomer and tray failed. This finding correlates with the clinical observation that silicones and polyethers are more difficult to remove completely from acrylic resin trays when an impression has to be repeated.

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