A qualitative comparison of various record base materials

DENTAL TECHNOLOGY SECTION

EDITOR

DANIEL H. GEHL

A qualitative comparison of various record base materials John D. Jones, D.D.S.* University of Texas Health ScienceCenter, Dental School, San Antonio, Tex.

Presented as a table clinic at the American Prosthodontic Society, Kansas City, MO. *Assistant Professor, Department of Prosthodontics.

(Lucitone, L. D. Caulk Co.) (Fig. 4). Table I reveals that all have their advantages and disadvantages. Each can be used successfully. The degree of successis more dependent on the skill and care with which each is used than on the choice of the material alone. The requirements for an ideal record base include (1) comfort, (2) good adaptation, (3) good fit, (4) reasonable price, (5) easy and quick adaptation, (6) rigidity, (7) strength in thin areas, (8) insusceptibility to easy distortion or breakage, (9) good color and taste, (10) little armamentarium required, (11) insusceptibility to temperature changes, (12) a border form similar to finished base, (13) suitability for setting teeth, (14) ability to take advantage of desirable undercuts, (15) nonabrasiveness to cast during removal or replacement, and (16) the ability to be readapted. Autopolymerized acrylic resin with the sprinkle technique as described by McCracken* possesses a greater number of the characteristics of the ideal material than the other materials considered, and its disadvantages appear to be less significant.

Fig. 1. Shellac record base.

Fig. 2. Tinfoil surface of a shellac record base stabilized with ZOE paste and tinfoil.

1 he literature is replete with references on the subject of record bases.l-l4 Most of these references concern technique and describe a new material or method for using other materials. Many dentists would agree that the most difficult and critical phase of denture construction concerns jaw relations. The accuracy of these records and the accuracy of the following steps in denture construction are dependent on the quality of the record bases. This report considers four widely used materials that have been recommended for record bases: (1) shellac record base (Trubyte Baseplates, Kerr Mfg. Co., Romulus, Mich.) (Fig. 1); (2) shellac record base stabilized with ZOE paste, bite registration paste (Kerr Mfg. Co.) (Fig. 2); (3) autopolymerized acrylic resin base (Orthodontic Resin, L. D. Caulk Co., Milford, Del.) (Fig. 3); and (4) processed acrylic resin base

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JANUARY

1983

VOLUME

49

NUMBER

I

0022-3913/83/010130

+ 03$00.30/00

1983 The C. V. Mosby Co.

RECORD

BASE MATERIALS

acrylic resin record base.

Fig. 3. Autopolymerized

Table I. Comparison

shellac

Processed acrylic

THE JOURNAL

acrylic

resin record

base.

Disadvantages

Advantages

Shellac

Autopolymerized

acrylic

of various record base materials

Material

Stabilized

Fig. 4. Processed

resin

resin

OF PROSTHETIC

DENTISTRY

1. 2. 3. 4.

Easy adaptation Quick adaptation Inexpensive Permits readaptation

1. 2. 3. 4.

More rigid More stable Inexpensive Permits readaptation

1. 2. 3. 4. 5. 6. 7. 8. 9.

Good adaptation Easy adaptation Inexpensive Rigid Stable Good color Not easily broken Not easily distorted Suitable for arranging

1. 2. 3. 4. 5. 6. 7. 8.

Best adaptation Accurate fit Does not distort Rigid Stable Good color Not easily broken Less processing error to affect occlusion

if necessary

if necessary

1. 2. 3. 4. 5. 6. 7. 8.

Poor adaptation Poor fit Lacks rigidity Distorts Brittle Breaks Does not permit polishing Color objectionable

1. 2. 3. 4. 5. 6. 7.

Poor adaptation Poor fit Distorts Breaks Bulky Taste objectionable Color objectionable

1. Blockout required 2. Loose tit 3. Limited distortion

teeth 1. 2. 3. 4. 5.

Time consuming Extra laboratory-procedures Extra finish line Cast is sacrificed Bxpensive

JONES

REFERENCES 1. Assadzadeh, A., and Yarmand, M. A.: A technique for making temporary bases for complete dentures. J PROSTHET DENT 33:333, 1975. 2. Boucher, C. O., Hickey, J. C., and Zarb, G. A.: Prosthodontic Treatment for Edentulous Patients, ed 7. St. Louis, 1975, The C. V. Mosby Co. 3. Burnett, J. V.: Accurate trial denture bases. J PROSTHETDENT 19:338, 1968. 4. Elder, S. T.: Stabilized baseplates. J PROSTHETDENT 5162, 1955. 5. Graser, G. N.: Completed bases for removable dentures. J PROSTHETDENT 39t232, 1978. 6. Harris, L. W.: Facial templates and stabilized baseplates with the new chemical set resins. J PROSTHETDENT 1:156, 1951. 7. Heartwell, C. M., and Rahn, A. 0.: Syllabus of Complete Dentures, ed 3. Philadelphia, 1980, Lea & Febiger. 8. McCracken, W. L.: Auxiliary uses of cold-curing acrylic resins in prosthetic dentistry. J Am Dent Assoc 42298, 1953. 9. Morrow, R. M., Rudd, K. D., and Eissmann, H. F.: Dental

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10. 11.

12. 13. 14.

Laboratory Procedures: Complete Dentures. St. Louis, 1980, The C. V. Mosby Co. Ringsdorf, W. M.: Ideal baseplates. J Am Dent Assoc 50:66, 1955. Schoen, P. E., and Stewart, J. L.: The effect of temporary bases on the accuracy of centric jaw-relationship records. J PROSTHET DENT l&211, 1967. Terry, J. M., and Wahlberg, R.: Vacuum adaptation of baseplate materials. J PROSTHETDENT l&26, 1966. Tucker, K. M.: Accurate record bases for jaw relation procedures. J PROSTHETDENT l&224, 1966. Winkler, S.: Essentials of Complete Denture Prosthodontics. Philadelphia, 1979, W. B. Saunders Co.

Reprint requeststo: DR. JOHN D. JONES UNIVERSITYOF TEXAS HEALTH SCIENCECENTER DENTAL SCHOLL 7703 FLOYD CURL DR. SAN ANTONIO, TX 78284

JANUARY 1983

VOLUME 49

NUMBER 1