J Korean Acad Conserv Dent.  2010 May;35(3):188-197. 10.5395/JKACD.2010.35.3.188.

Evaluation of radiopacity and discriminability of various fiber reinforced composite posts

• Lee EH
• Choi HM
• Park SH
• Kim JW
• Cho KM

• KMID: 2294345
• DOI: http://doi.org/10.5395/JKACD.2010.35.3.188

Abstract

The purpose of this study was to compare radiopacity and radiographic discriminability of various FRC-Posts. Six FRC-Posts were investigated ; 1) FRC Postec Plus (Ivoclar Vivadent AG, Schaan, Liechtenstein), 2) Snowlight (Carbotech, Lewis center, OH, USA), 3) Dentin Post (Komet Brasseler, Lamgo, Germany), 4) Rely-X Fiber Post (3M ESPE, St.paul, MN, USA), 5) D.T.-Light Post (BISCO, Schaumburg, IL,USA), 6) Luxapost (DMG, Hamburg, Germany) The radiographs of each post with a reference 1 mm / 2 mm aluminum step-wedge was taken using digital sensor. The optical density were calculated by gray value of 10 x 10 pixel and compared in mm Al equivalent at five points. Six maxillary incisors of similar radiopacity were used. Radiographs of posts in Mx. incisors of lingual side of dry mandible were taken. We showed radiographs and asked the questionnaire to 3 radiologists, 3 endodontists, 3 general practitioners. The questionnaire was comprised of choices of the highest, lowest radiopaque individual post and the choices of best discriminable post at apical, coronal area. The following results were obtained. 1. Each post system showed various radiopacity. 2. There was change of discriminability between each post and simulated specimens regardless of examiner. Although each post showed various radiopacity, the difference of radiopacity did not affect on discriminability.

Keyword

Radiopacity; FRC-post; Discriminability; Digital sensor; Aluminum step-wedge; mm Al equivalent

MeSH Terms

Acrylic Resins
Aluminum
Composite Resins
Dentin
General Practitioners
Humans
Incisor
Mandible
Polyurethanes
Resin Cements
Surveys and Questionnaires
Acrylic Resins
Aluminum
Composite Resins
Polyurethanes
Resin Cements

Figure

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  Figure 1 Aluminum step-wedge. a. 1 mm step, b. 2 mm step.

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  Figure 2 Radiographic image of post with aluminum step-wedge.

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  Figure 3 Measuring point of post. 1. Apex of post 2. 4 mm to apex of post 3. 7 mm to apex of post 4. Point of inclination change 5. 10 mm to apex of post

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  Figure 4 Radiographic image of posts.

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  Figure 5 Radiographic images of simulated specimens.

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  Figure 6 Questionnaire.

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  Figure 7 Absorbance of aluminum thickness.

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