Disinfection efficiency of irreversible hydrocolloid impressions using different concentrations of sodium hypochlorite: a pilot study.

J Contemp Dent Pract. 2007;8(4):27-34

Authors: Memarian M, Fazeli MR, Jamalifar H, Azimnejad A

AIM: Dental impressions are potential sources of bacterial contamination which could eventually lead to transmissible infectious diseases through the blood or saliva. Sodium hypochlorite is an effective disinfectant recommended by the American Dental Association (ADA) in a 1:10 dilution for a ten minute immersion to disinfect irreversible hydrocolloid impressions. As the ADA protocol is sometimes neglected in busy practice settings, this pilot study was designed to determine an efficient and effective protocol for disinfection of irreversible hydrocolloid impressions. METHODS AND MATERIALS: Various concentrations of sodium hypochlorite and disinfection times were challenged against irreversible hydrocolloid impressions contaminated with six Gram-positive and Gram-negative bacteria. RESULTS: A two minute immersion time in a 0.6% solution of sodium hypochlorite protocol was found to prevent bacterial growth on the impressions. CONCLUSION: Disinfection of irreversible hydrocolloid impressions in a 0.6% solution of sodium hypochlorite for two minutes was as effective as the ADA's protocol of using a 0.5% sodium hypochlorite solution for ten minutes to destroy the test bacteria.

PMID: 17486184 [PubMed - indexed for MEDLINE]

Making fixed prostheses that are not too high.

J Am Dent Assoc. 2006 Jan;137(1):96-8

Authors: Christensen GJ

It has been observed that a high percentage of multiple crowns or FPDs arrive from laboratories too "high." This article suggests methods to create accurate alginate impressions, opposing casts and IORs. If dentists use these techniques, it is anticipated that fewer FPDs will be too high as dentists attempt to seat them in the mouth.

PMID: 16457005 [PubMed - indexed for MEDLINE]

A technique that saves impression material.

J Am Dent Assoc. 1999 Aug;130(8):1202

Authors: Barr MI

PMID: 10491932 [PubMed - indexed for MEDLINE]

Impression materials.

Br J Orthod. 1998 May;25(2):133-40

Authors: Doubleday B

This paper incorporates a brief review of impression materials currently available for use by the orthodontic profession; subjective assessments of a selection of alginates, silicones and bite registration materials in a clinical setting; and a list of prices and retailers of impression materials.

PMID: 9668998 [PubMed - indexed for MEDLINE]

What category of impression material is best for your practice?

J Am Dent Assoc. 1997 Jul;128(7):1026-8

Authors: Christensen GJ

PMID: 9231610 [PubMed - indexed for MEDLINE]

Comparing the accuracy of reversible hydrocolloid and elastomeric impression materials.

J Am Dent Assoc. 1997 Feb;128(2):183-8

Authors: Federick DR, Caputo A

This in vitro investigation evaluated the accuracy of reversible hydrocolloid, vinyl polysiloxane and polyether elastic impression materials used in conjunction with two die stones. The authors made impressions in an experimental environment that approximated clinical conditions in regard to temperature and moisture. Analysis of variance and t-tests were used to compare corresponding measurements on experimental casts made from the various impression materials.

PMID: 9037971 [PubMed - indexed for MEDLINE]

Foreign body aspiration in dentistry: a review.

J Am Dent Assoc. 1996 Aug;127(8):1224-9

Authors: Cameron SM, Whitlock WL, Tabor MS

This article reviews the dangers of aspirating foreign bodies of dental origin. Two illustrative cases are presented, including an unusual case involving aspiration of an elastomeric impression material. The authors describe the techniques used to identify the foreign body. A radiodensimetric study of four impression materials demonstrates the difficulty of identifying most impression materials. The authors also present some strategies for reducing the risk of aspiration during dental procedures.

PMID: 8803399 [PubMed - indexed for MEDLINE]

Pneumoconiosis in an elderly dentist.

Chest. 1988 Jun;93(6):1312-3

Authors: Loewen GM, Weiner D, McMahan J

Numerous dusts found commonly in the dental laboratory have been suggested as potential pulmonary hazards. We recently noted a case of severe interstitial pulmonary fibrosis with intraalveolar deposition of unique foreign body inclusions in an elderly dentist. The composition of these particles was shown to be consistent with that of alginate impression powder. This is in contrast to previously reported pneumoconioses in dental workers, which are usually induced by metallic alloys or silicates. Further studies are needed to identify the causes and prevalence of pneumoconiosis in the dental lab.

PMID: 3371114 [PubMed - indexed for MEDLINE]

The biologic availability of fluoride from alginate impressions and APF gel applications in children.

J Dent Res. 1981 Apr;60(4):776-80

Authors: LeCompte EJ, Whitford GM

Ten child volunteers received routine alginate impressions and APF gel topical applications during separate visits. Whole saliva, urine, and surface enamel fluoride concentrations were measured before and after these procedures. Significant increases in salivary, urinary, and enamel fluoride concentrations were observed following APF gel application but only in whole saliva following alginate impressions.

PMID: 7009672 [PubMed - indexed for MEDLINE]

Subcutaneously implanted alginate as a continuous-release source of fluoride.

J Dent Res. 1980 Feb;59(2):186-91

Authors: Whitford GM, Ekstrand J, Callan RS, Pearson DE

The fluoride concentrations of seven brands of alginate ranged from 8600 to 30,500 ppm. In acute and chronic in vivo studies, fluoride was continuously released from subcutaneously implanted alginate cylinders for up to three weeks. This technique is a simple and economical method for elevating soft and hard tissue fluoride levels.

PMID: 6928004 [PubMed - indexed for MEDLINE]

Mechanical properties of hydrocolloid and rubber impression materials.

J Dent Res. 1967 Jul-Aug;46(4):714-21

Authors: MacPherson GW, Craig RG, Peyton FA

PMID: 5231377 [PubMed - indexed for MEDLINE]

Characterization of the setting process of silicone dental rubbers.

J Dent Res. 1966 Jul-Aug;45(4):1016-23

Authors: Braden M, Elliott JC

PMID: 5224070 [PubMed - indexed for MEDLINE]

Role of ingredients in alginate impression compounds.

J Dent Res. 1966 Jul-Aug;45(4):1120-9

Authors: Buchan S, Peggie RW

PMID: 4288619 [PubMed - indexed for MEDLINE]