Major advances in impression materials and their application have occurred during the last decade, with greater emphasis being placed on rubber impression materials than on dental compound, zinc oxide-eugenol, and agar and alginate. Of particular interest has been the effect of disinfection solutions on the qualities of impressions and the biocompatibility of impression materials. The principal advance in hydrocolloids has been the introduction of the agar/alginate impression technique, which has simplified the procedure and improved the quality of gypsum dies compared with those prepared in alginate impressions. The tear strength of some alginates has been improved, and some have been formulated so that the powder is dustless, thus reducing the health hazard as a result of patient inhalation of dust during the dispensing process. Polyether and silicone impression materials have been modified so that the working time, viscosity, and flexibility of the polyethers have been improved and, with the introduction of addition silicones, their accuracy has become exceptional. Although the early addition silicones liberated hydrogen after setting, thus delaying the pouring of models and dies, most addition silicones have been improved so that no hydrogen is released and dies can be poured immediately. The introduction of automatic mixing systems for addition silicones has simplified their manipulation, has reduced the number of voids in impressions, and has reduced the amount of material wasted. The incorporation of surfactants into addition silicones has made them hydrophilic, with wetting properties similar to those of polyethers, and has made pouring bubble-free gypsum dies easier.
This review is confined to published and unpublished information of the past decade. It will also suggest trends that should be anticipated in the near future based on this information. The review will not present information developed before 1975, which is available in several textbooks on dental materials by Craig (1985a), Phillips (1982), and Williams and Cunningham (1979).
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References
1.
Aiach, D.; Malone, W.F.P.; and Sandrik, J. (1984): Dimensional Accuracy of Epoxy Resins and Their Compatibility with Impression Materials, J Prosthet Dent52:500-504.
2.
Appelbaum, E.M. and Mehra, R.V. (1984): Clinical Evaluation of Polyvinylsiloxane for Complete Denture Impressions, J Prosthet Dent52:537-539.
Arikawa, H.; Fujii, K.; Kanie, T.; Joshin, K.; Inoue, K.; Onizuka, T.; and Jimi, T. (1982): A Method for the Determination of Setting Characteristics of Elastomeric Impression Materials, Dent Mater1:67-72.
7.
Augsburger, R.H.; Soelberg, K.B.; Pelzner, R.B.; Bog-Dan, M.S.; and Kempler, D. (1981): Accuracy of Casts from Three Impression Materials and Effect of a Gypsum Hardener, Oper Dent6:70-74.
8.
Bell, J.W.; Davies, E.H.; and Von Fraunhofer, J.A. (1976): The Dimensional Changes of Elastomeric Impression Materials under Various Conditions of Humidity, J Dent4:73-82.
9.
Bergman, B.; Bergman, M.; and Olsson, S. (1985): Alginate Impression Materials, Dimensional Stability and Surface Detail Sharpness Following Treatment with Disinfectant Solutions , Swed Dent J9:255-262.
10.
Bergman, M.; Olsson, S.; and Bergman, B. (1980): Elastomeric Impression Materials. Dimensional Stability and Surface Detail Sharpness Following Treatment with Disinfection Solutions, Swed Dent J4:161-167.
11.
Blankenau, R.J.; Kelsey, W.P.; and Cavel, W.T. (1984): A Possible Allergic Response to Polyether Impression Material: A Case Report, J Am Dent Assoc108:609-610.
12.
Blatterfein, L.; Klein, I.E.; and Miglino, J.C. (1980): A Loading Impression Technique for Semiprecision and Precision Removable Partial Dentures, Prosthet Dent43:9-14.
13.
Bomberg, T.J. and Hatch, R.A. (1984): Correction of Defective Impressions by the Selective Addition of Impression Material, J. Prosthet Dent52:38-40.
14.
Braden, M. and Inglis, A.T. (1986): Visco-elastic Properties of Dental Elastomeric Impression Materials, Biomaterials7:45-48.
15.
Brugirard, J.-L. (1983): Etude Comparee d'un Nouvel Hydrocolloide Irreversible , Rev Mens Suisse Odonto-stomato!93:455-462.
16.
Brune, D. and Beltesbrekke, H. (1978): Levels of Airborne Particles Resulting from Handling Alginate Impression Material, Scand J Dent Res86:206-210.
17.
Campagni, W.V.; Rivera, S.; and Davidoff, S.R. (1985): Simplified Techniques for the Preparation and Use of Reversible Hydrocolloid Impression Material, J Prosthet Dent54:167-169. Carlyle, L.W. III (1983): Compatibility of Irreversible Hydrocolloid Impression Materials with Dental Stones, J Prosthet Dent49:434-437.
18.
Caswell, C.W.; Von Goten, A.S.; and Meng, T.R. (1986): Volumetric Proportioning Techniques for Irreversible Hydrocolloids : A Comparative Study, J Am Dent Assoc112:859-861. Cook, W.D. (1982a): Rheological Studies of the Polymerization of Elastomeric Impression Materials. I. Network Structure of the Set State, J Biomed Mater Res16:315-330.
19.
Cook, W.D. (1982b): Rheological Studies of the Polymerization of Elastomeric Impression Materials. II. Viscosity Measurements, J Biomed Mater Res16:331-344.
20.
Cook, W.D. (1982c): Rheological Studies of the Polymerization of Elastomeric Impression Materials. III. Dynamic Stress Relaxation Modulus, J Biomed Mater Res16:345-357.
21.
Cook, W.D.; Liem, F.; Russo, P.; Scheiner, M.; Simkiss, G.; and Woodruff, P. (1984): Tear and Rupture of Elastomeric Dental Impression Materials, Biomaterials5:275-280.
22.
Cook, W.D. and Thomasz, F. (1986): Rubber Gloves and Addition Silicone Materials , Aust Dent J31:140.
23.
Council On Dental Materials And Devices (1977 ): Status Report on Polyether Impression Materials, J Am Dent Assoc95 :126-130.
24.
Craig, R.G. (1977): A Review of Properties of Rubber Impression Materials , Mich Dent Assoc J59:254-261.
25.
Craig, R.G. (1982): Composition, Characteristics and Clinical and Tissue Reactions of Impression Materials. In: Biocompatibility of Dental Materials, Vol. III, D.C. Smith and D.F. Williams, Eds., Boca Raton, Florida: CRC Press, pp. 227-298.
Craig, R.G. (1985b): Evaluation of an Automatic Mixing System for an Addition Silicone Impression Material, J Am Dent Assoc110:213-215.
28.
Craig, R.G. (1986a): Unpublished data.
29.
Craig, R.G. (1986b): Additions-vernetzende Silikon-Abdruchmaterialien im Vergleich zu Anderen Elastichen Abdruchmaterialien, Phillip J fur Restaurative Zahnmedezin3:244-256.
30.
Cummins, R.L. (1975): A Laboratory Procedure for Copperplating Rubber Base Impressions, J Prosthet Dent33:342-345.
31.
Davis, D.R. and Preble, J.S. (1986): Accuracy of a Hydrophilic Irreversible Hydrocolloid/Silicone Impression Material, J Prosthet Dent55:304-308.
32.
De Araujo, P.A. and Jorgensen, K.D. (1985): Effect of Material Bulk and Undercuts on the Accuracy of Impression Materials, J Prosthet Dent54:791-794.
33.
De Araujo, P.A. and Jorgensen, K.D. (1986): Improved Accuracy by Reheating Addition-reaction Silicone Impressions, J Prosthet Dent55:11-12.
34.
De Araujo, P.A.; Jorgensen, K.D.; and Finger, W. (1985): Viscoelastic Properties of Setting Elastomeric Impression Materials, J Prosthet Dent54:633-636.
35.
De Freitas, J.F. (1980): Potential Toxicants in Alginate Powders, Aust Dent J15:224-228.
36.
Eames, W.B. and Litvak, C.S. (1984): New Irreversible Hydrocolloid Silicone Impression Material, J Prosthet Dent52:479-484.
37.
Eames, W.B.; Rogers, L.B.; Wallace, S.W.; and Suway, N.B. (1978): Compatibility of Gypsum Products with Hydrocolloid Impression Materials, Oper Dent3:108-112.
38.
Eames, W.B. and Sieweke, J.C. (1980): Seven Acrylic Resins for Custom Trays and Five Putty-wash Systems Compared, Oper Dent5:162-167.
39.
Eames, W.B.; Wallace, S.W.; Suway, N.B.; and Rogers, L.B. (1979): Accuracy and Dimensional Stability of Elastomeric Impression Materials, J Prosthet Dent42:159-162.
40.
Eliasson, S.T. and Holte, N.O. (1979): Rubber-base Impression Materials as a Foreign Body. Report of a Case, Oral Surg48:379-380.
41.
Ellis, B. and Lamb, D.J. (1981): The Setting Characteristics of Alginate Impression Materials, Br Dent J151:343-346.
42.
Fehling, A.W.; Hesby, R.A.; and Pelleu, G.B., Jr. (1986): Dimensional Stability of Autopolymerizing Acrylic Resin Impression Trays, J Prosthet Dent55:592-597.
43.
Finger, W. (1986): Accuracy of Dental Duplicating Materials, Quintessence Dent Tech10:89-92.
44.
Finger, W. and Ohsawa, M. (1983): Accuracy of Stone-casts Produced from Selected Addition-type Silicone Impressions, Scand J Dent Res91:61-65.
45.
Fusayama, T.; Kurosaki, N.; Node, H.; and Nakamura, M. (1982): A Laminated Hydrocolloid Impression for Indirect Inlays, J Prosthet Dent47:171-176.
46.
Gettleman, L. and Agranat, B.J. (1978): Polysulfide Rubber Foreign Body: Report of a Case , Quintessence Int10:21-24.
47.
Gettleman, L.; Nathanson, D.; Shklar, G.; Brath-Waite, W.J., Jr. ; Darmiento, L.; Levine, P.; and Judes, H. (1978): Preliminary Evaluation of the Histotoxicity and Radiopacity of Lead-containing Elastic Impression Materials, J Am Dent Assoc96:987-993.
48.
Goldberg, A.J. (1974): Viscoelastic Properties of Silicone, Polysulfide, and Polyether Impression Materials, J Dent Res53:1033-1039.
49.
Goldfogel, M.; Harvey, W.L.; and Winter, D. (1985): Dimensional Change of Acrylic Resin Tray Materials , J Prosthet Dent54:284-286.
50.
Grajower, R.; Kaufman, E.; and Stern, N. (1975): Temperature of the Pulp Chamber During Impression Taking of Full Crown Preparations with Modelling Compound, J Dent Res54:212-217.
51.
Gunther, G. and Welsh, S.L. (1978): Evaluation of a Rubber-base Impression Material , J Prosthet Dent39:95-99.
52.
Hambrok, H.-J. (1981): Einfluss des Mashinellen Anmischens auf das Abbindeverhalten Elastischer Abformmassen, Dtsch Zahnärztl Z36:805-810.
53.
Hansson, O. and Eklund, J. (1984): A Historical Review of Hydrocolloids and an Investigation of the Dimensional Accuracy of the New Alginates for Crown and Bridge Impressions when Using Stock Trays, Swed Dent J8:81-95.
54.
Harcourt, J.K. (1978): A Review of Modern Impression Materials, Aust Dent J23:178-186.
55.
Hattab, F. and Frostell, G. (1980): The Release of Fluoride from Two Products of Alginate Impression Materials, Acta Odontol Scand38:385-395.
56.
Hattab, F. and Linden, L.-A. (1985): Diffusion of Fluoride from Alginate Compared with Other Topical Fluoride Agents, Scand J Dent Res93:269-275.
57.
Herfort, T.W.; Gerberich, W.W.; Macosko, C.W.; and Goodkind, R.J. (1977): Viscosity of Elastomeric Impression Materials , J Prosthet Dent38:396-404.
58.
Herfort, T.W.; Gerberich, W.W.; Macosko, C.W.; and Goodkind, R.J. (1978): Tear Strength of Elastomeric Impression Materials , J Prosthet Dent39:59-62.
59.
Herring, H.W.; Tames, M.A.; and Zardiackas, L.D. (1984): Comparison of the Dimensional Accuracy of a Combined Reversible/irreversible Hydrocolloid Impression System with other Commonly Used Impression Materials, J Prosthet Dent52:795-799.
60.
Hollinger, J.O.; Lorton, L.; Krantz, W.A.; and Con-Nelly, M. (1984): A Clinical and Laboratory Comparison of Irreversible Hydrocolloid Impression Techniques, J Prosthet Dent51:304-309.
61.
Imai, Y.; Watanabe, A.; and Masuhara, E. (1983): Structure-biocompatibility Relationship of Condensation Polymers, J Biomed Mater Res17:905-912.
62.
Inoue, K. and Wilson, H.J. (1978a): Viscoelastic Properties of Elastomeric Impression Materials. II: Variation of Rheological Properties with Time, Temperature and Mixing Proportions, J Oral Rehabil5:261-267.
63.
Inoue, K. and Wilson, H.J. (1978b): Viscoelastic Properties of Elastomeric Impression Materials. III: The Elastic Recovery after Removal of Strains Applied at the Setting Time, J Oral Rehabil5:323-327.
64.
Jarvis, R.G. and Earnshaw, R. (1980): The Effects of Alginate Impressions on the Surface of Cast Gypsum. I. The Physical and Chemical Structure of the Cast Surface, Aust Dent J25:349-356.
65.
Jarvis, R.G. and Earnshaw, R. (1981): The Effect of Alginate Impressions on the Surface of Cast Gypsum. II. The Role of Sodium Sulphate in Incompatibility, Aust Dent J26:12-17.
66.
Johnson, G.H. and Craig, R.G. (1985): Accuracy of Four Types of Rubber Impression Materials Compared with Time of Pour and a Repeat Pour of Models, J Prosthet Dent53:484-490.
67.
Johnson, G.H. and Craig, R.G. (1986a): Accuracy and Bond Strength of Combination Agar/alginate Hydrocolloid Impression Materials, J Prosthet Dent55:1-6.
68.
Johnson, G.H. and Craig, R.G. (1986b): Accuracy of Addition Silicones as a Function of Technique, J Prosthet Dent55:197-203.
69.
Jorgensen, K.D. (1979): Retention of Elastiske Aftryksmaterialer. I. Aftrykssker , Tandlaegebladet83:465-478.
70.
Jrgensen, K.D. (1980): Basisplader til Aftryksskeer: Elastiskplastiske Egenskaber, Tandlaegebladet84:491-494.
71.
Jrgensen, K.D. (1982a): Praecisionen af Reversible og Irreversible Hydrokolloider of af Additionspolymeriserende Silikone Anvendt som Aftryksmaterialer i Krone- og Indlaegsteknikken, Tandlaegebladet86:626-631.
72.
Jrgensen, K.D. (1982b): Thermal Expansion of Addition Polymerization (Type II) Silicone Impression Materials, Aust Dent J27:377-81.
73.
Kaloyannides, T.M. and Christidou, L. (1975): Elasticity of Impression Materials: IV. Permanent Deformation as a Function of Time, J Dent Res54:168-173.
74.
Kishimoto, M.; Shillingburg, H.T., Jr.; and Duncan-Son, M.G., Jr. (1980): A Comparison of Six Impression Syringes, J Prosthet Dent43:546-551.
75.
Klotzer, W.T.; Ben-Ur, Z.; and Bonn, B. (1983): Zur Toxizitat Elastomerer Abformmaterialien, Dtsch Zahndrztl Z38:1020-1023.
76.
Knibbs, P.J. and Piney, M.D. (1985): An Assessment of the Relative Dustiness of Different Alginate Impression Materials Under Simulated Working Conditions, Br Dent J158:171-176.
77.
Koran, A., III (1980): Impression Materials for Recording the Denture Bearing Mucosa, Dent Clin N Am24:97-111.
78.
Koran, A., III: Powers, J.M.; and Craig, R.G. (1977): Apparent Viscosity of Materials Used for Making Edentulous Impressions, J Am Dent Assoc95:75-79.
79.
Koski, R.E. (1977): Comparative Study of Selected Alginate Materials and Devices, J Am Dent Assoc94:713-716.
80.
Lacy, A.M.; Bellman, T.; Fukui, H.; and Jendresen, M.D. (1981a): Time-dependent Accuracy of Elastomer Impression Materials. Part I: Condensation Silicones, J Prosthet Dent45:209-215.
81.
Lacy, A.M.; Fukui, H.; Bellman, T.; and Jendresen, M.D. (1981b): Time-dependent Accuracy of Elastomer Impression Materials. Part II: Polyether, Polysulfides, and Polyvinylsiloxane, J Prosthet Dent45:329-333.
82.
LeCompte, E.J. and Whitford, G.M. (1981): The Biologic Availability of Fluoride from Alginate Impressions and APF Gel Applications in Children, J Dent Res60:776-780.
83.
Lehmann, K.M. and Behrend, G. (1984): Die Wiedergabe des Abstandes von Brückenpfeilern Durch Reversibles Hydrokolloid, Dtsch Zahnärztl Z39:876-879.
84.
Lehmann, K.M. and Lindemann, J. (1980): Die Wiedergabe des Pfeilerabstandes bei der Abformung fur Festsitzenden Zahnersatz, Dtsch Zahnärztl Z35:537-539.
85.
Linke, B.A.; Nicholls, J.I.; and Faucher, R.R. (1985): Distortion Analysis of Stone Casts Made from Impression Materials, J Prosthet Dent54:794-802.
86.
Lorren, R.A.; Salter, D.J.; and Fairhurst, C.W. (1976): The Contact Angles of Die Stone on Impression Materials, J Prosthet Dent36:176-180.
87.
Lorton, L.; Phillips, R.W.; and Swartz, M.L. (1978): The Effect of Ultrasonic Cleaning Methods on Rubber Base Impression Materials, J Dent Res57:939.
88.
Mansfield, M.A. and Wilson, H.J. (1975): Elastomeric Impression Materials, Br Dent J139:267-272.
89.
Marcinak, C.F. and Draughn, R.A. (1982): Linear Dimensional Changes in Addition Curing Silicone Impression Materials, J Prosthet Dent47:411-413.
90.
Marcinak, C.F.; Young, F.A.; Draughn, R.A.; and Flem-Ming, W.R. (1980): Linear Dimensional Changes in Elastic Impression Materials, J Dent Res59:1152-1155.
91.
McCabe, J.F. and Bowman, A.J. (1981): The Rheological Properties of Dental Impression Materials, Br Dent J151:179-183.
92.
McCabe, J.F. and Storer, R. (1980): Elastomeric Impression Materials. The Measurement of Some Properties Relevant to Clinical Practice, Br Dent J149:73-79.
93.
McCabe, J.F. and Wilson, H.J. (1978): Addition Curing Silicone Rubber Impression Materials. An Appraisal of Their Physical Properties, Br Dent J145:17-20.
94.
Mendez, A.J. (1985): The Influence of Impression Trays on the Accuracy of Stone Casts Poured from Irreversible Hydrocolloid Impressions, J Prosthet Dent54:383-388.
Millstein, P.L. and Clark, R.E. (1981): Differential Accuracy of Silicone-body and Self-curing Resin Interocclusal Records and Associated Weight Loss, J Prosthet Dent46:380-384.
97.
Moor, T.L. (1985): Reproducibility of Dispensing One Brand of Irreversible Hydrocolloid Powder by Seven Methods, J Prosthet Dent54:144-145.
98.
Morford, H.T.; Tames, R.R.; and Zardiackas, L.D. (1986): Effects of Vacuum and Pressure on Accuracy, Reproducibility, and Surface Finish of Stone Casts Made from Polyvinyl Siloxane, J Prosthet Dent55:466-470.
99.
Morris, J.C.; Khan, Z.; and Fields, H., Jr. (1983): Effect on Surface Detail of Casts When Irreversible Hydrocolloid was Wetted Before Impression Making, J Prosthet Dent49:328-330.
100.
Moskowitz, M.E.; Loft, G.H.; and Reynolds, J.M. (1984): Using Irreversible Hydrocolloid to Evaluate Preparations and Fabricate Temporary Immediate Provisional Restorations, J Prosthet Dent51:330-333.
101.
Niessen, L.C.; Strassler, H.; Levinson, P.D.; Wood, G.; and Greenbaum, J. (1986): Effect of Latex Gloves on Setting Time of Polyvinylsiloxane Putty Impression Material, J Prosthet Dent55:128-129.
102.
Norling, B.K. and Reisbick, M.H. (1979): The Effect of Nonionic Surfactants on Bubble Entrapment in Elastomeric Impression Materials, J Prosthet Dent42:342-347.
103.
Ohsawa, M. and Jrgensen, K.D. (1983): Curing Contraction of Addition-type Silicone Impression Materials, Scand J Dent Res91:51-55.
104.
Olsson, S.; Bergman, B.; and Bergman, M. (1982): Zinc Oxide-Eugenol Impression Materials. Dimensional Stability and Surface Detail Sharpness Following Treatment with Disinfection Solutions, Swed Dent J6:177-180.
105.
Otani, H.; Adachi, M.; and Kanematsu, Y. (1985): Surface Reproduction of pH-adjusted Alginate Impression Materials, Dent Mater1:58-60.
106.
Owen, C.P. (1986): An Investigation into the Compatibility of Some Irreversible Hydrocolloid Impression Materials and Dental Gypsum Products. Part 1. Capacity to Record Grooves on the International Standard Die, J Oral Rehabil13:93-103.
107.
Pagniano, R.P.; Scheid, R.C.; Clowson, R.L.; Dage-Foerde, R.O.; and Zardiackas, L.D. (1982): Linear Dimensional Change of Acrylic Resins Used in the Fabrication of Custom Trays, J Prosthet Dent47:279-283.
108.
Phillips, R.W., Ed. (1982): Skinner's Science of Dental Materials, 8th ed., Philadelphia: W.B. Saunders Company .
109.
Plekavich, E.J. and Joncas, J.M. (1983): The Effect of Impression-Die Systems on Crown Margins, J Prosthet Dent49:772-776.
110.
Reisbick, M.H.; Garrett, R.; and Smith, D.D. (1982): Some Effects of Device Versus Handmixing of Irreversible Hydrocolloids, J Prosthet Dent47:92-94.
111.
Reisbick, M.H. and Matyas, J. (1975): The Accuracy of Highly Filled Elastomeric Impression Materials, J Prosthet Dent33:67-72.
112.
Rihani, A. (1981): Pressures Involved in Making Upper Edentulous Impressions, J Prosthet Dent46:610-614.
113.
Sandrick, J.L. and Sarna, T. (1980): Temperature of Elastomeric Impression Materials while Setting in the Mouth, J Dent Res59:1985-1986.
114.
Sandrick, J.L. and Vacco, J.L. (1983): Tensile and Bond Strength of Putty-wash Elastomeric Impression Materials, J Prosthet Dent50:358-361.
115.
Saunders, T.R.; Pierson, W.P.; and Miller, R.I. (1982): Effect of Lead-containing Elastic Impression Materials on Whole Blood Lead Levels, J Prosthet Dent47:209-211.
116.
Sawyer, H.F.; Sandrik, J.L.; and Neiman, R. (1976): Accuracy of Casts Produced from Alginate and Hydrocolloid Impression Materials, J Am Dent Assoc93:806-808.
117.
Scrabeck, J.G.; Eames, W.B.; and Hicks, M.J. (1986): Spatulation Methods and Porosities in Investments and Impression Material, J Prosthet Dent55:332-334.
118.
Sneed, W.D.; Miller, R.; and Olson, J. (1983): Tear Strength of Ten Elastomeric Impression Materials , J Prosthet Dent49 :511-513.
119.
Stackhouse, J.A., Jr. (1975): A Comparison of Elastic Impression Materials, J Prosthet Dent34:305-313.
120.
Stackhouse, J.A., Jr. (1981a): Impression Materials and Electrodeposits. Part I: Impression Materials, J Prosthet Dent45:44-48.
121.
Stackhouse, J.A., Jr. (1981b): Impression Materials and Electrodeposits. Part II: Electrodeposits, J Prosthet Dent45:146-151.
122.
Stackhouse, J.A., Jr. (1983): Voids in a Mixed Elastomeric Impression Material, J Prosthet Dent50:762-766.
123.
Stackhouse, J.A., Jr. (1985): Relationship of Syringe-tip Diameter to Voids in Elastomeric Impressions, J Prosthet Dent53 :812-815.
124.
Stannard, J.G. and Craig, R.G. (1979): Modifying the Setting Rate of an Addition-type Silicone Impression Material, J Dent Res58:1377-1382.
125.
Stannard, J.G. and Sadighi-Nouri, M. (1986): Retarders for Polyvinylsiloxane Impression Materials: Evaluation and Recommendations, J Prosthet Dent55:7-10.
126.
Stauffer, J.-P.; Meyer, J.-M.; and Nally, J.-N. (1976): Accuracy of Six Elastic Impression Materials Used for Complete-arch Fixed Partial Dentures, J Prosthet Dent35:407-415.
127.
Storer, R. and McCabe, J.F. (1981): An Investigation of Methods Available for Sterilising Impressions, Br Dent J151:217-219.
128.
Tjan, A.H.L.; Whang, S.B.; and Tjan, A.H. (1984): Clinically Oriented Assessment of the Accuracy of Three Putty-wash Silicone Impression Techniques, J Am Dent Assoc108:973-975.
129.
Tjan, A.H.L.; Whang, S.B.; Tjan, A.H.; and Sarkissian, R. (1986): Clinically Oriented Evaluation of the Accuracy of Commonly Used Impression Materials, J Prosthet Dent56:4-8.
130.
Tolley, L.G. and Craig, R.G. (1978): Viscoelastic Properties of Elastomeric Impression Materials: Polysulphide, Silicone and Polyether Rubbers, J Oral Rehabil5:121-128.
131.
Valderhaug, J. and Floystrand, F. (1984): Dimensional Stability of Elastomeric Impression Materials in Custom-made and Stock Trays, J Prosthet Dent52:514-517.
132.
Van Groeningen, G. and Nater, J.P. (1975): Reactions to Dental Impression Materials, Contact Derm1:373-376.
133.
Vermilyea, S.G.; Powers, J.M.; and Craig, R.G. (1975a): Polyether, Polysulfide and Silicone Rubber Impression Materials. Part 1: Quality of Silverplated Dies, Mich Dent Assoc J57:371-404.
134.
Vermilyea, S.G.; Powers, J.M.; and Craig, R.G. (1975b): Polyether, Polysulfide and Silicone Rubber Impression Materials. Part 2: Accuracy of Silverplated Dies, Mich Dent Assoc J57:405-410.
135.
Viohl, J. and Nolte, T. (1983): Haftung von Elastomeren Absormmaterialien am Abdruckloffel , Dtsch Zahnärztl Z38:13-17.
136.
Whitford, G.M. and Ekstrand, J. (1980): Systemic Absorption of Fluoride from Alginate Impression Material in Humans, J Dent Res59:782-785.
137.
Wiktorsson, G. and Feder, D. (1983): Quality of Stone Dies Produced by Different Impression Materials. A Comparative Study of Impression Techniques, Swed Dent J7:77-83.
138.
Williams, D.F. and Cunningham, J. (1979): Materials in Clinical Dentistry, Oxford: Oxford University Press.
139.
Williams, J.R. (1984): Physical Properties of Addition Silicones as a Function of Composition. Master's Thesis, Ann Arbor, University of Michigan.
140.
Williams, J.R. and Craig, R.G. (1984): Physical Properties of Addition Silicones as a Function of Composition, Dent Mat Gp Microfilm, 62nd General Session IADR, Dallas, TX, Mar. 15-18; J Oral Rehabil, in press.
141.
Williams, K.R. and Watkins, H. (1983): Comparison of the Structure and Properties of Conventional and Siliconised Alginates, Br Dent J155:415-418.
142.
Wilson, E.G. and Werrin, S.R. (1982): A Versatile Impression Technique for Dental Castings , Quintessence Int12:1307-1313.
143.
Wilson, E.G. and Werrin, S.R. (1983): Double Arch Impressions for Simplified Restorative Dentistry, J Prosthet Dent49 :198-202.
144.
Winstock, D. and Warnakulasuriya, S. (1986): Impression Material Presenting in the Maxillary Antrum as a Foreign Body, Br Dent J160:54-55.
145.
Woodward, J.D.; Morris, J.C.; and Khan, Z. (1985): Accuracy of Stone Casts Produced by Perforated Trays and Nonperforated Trays, J Prosthet Dent53:347-350.
146.
Woody, R.D.; Huget, E.F.; and Cutright, D.E. (1977): Characterization of Airborne Particles from Irreversible Hydrocolloids, J Am Dent Assoc94:501-504.
