Dislocation resistance of ProRoot Endo Sealer, a calcium silicate‐based root canal sealer, from radicular dentine

International Endodontic Journal - Tập 42 Số 1 - Trang 34-46 - 2009
Bradford Huffman1, Sui Mai2, Lorenzo A. Pinna3, R. Norman Weller4, Carolyn Primus5, James L. Gutmann6, D.H. Pashley7, Franklin R. Tay4,7
1School of Dentistry, Medical College of Georgia, Augusta, GA, USA
2Guanghua School of Stomatology & Institute of Stomatological Research, Sun Yat-sen University, Guangzhou, China
3Universita degli Studi di Cagliari, Reparto di Odontoiatria Conservatrice, Sardinia, Italy
4Department of Endodontics, School of Dentistry, Medical College of Georgia, Augusta, GA, USA
5Primus Consulting, Bradenton, FL, USA
6Department of Endodontics, Baylor College of Dentistry, Texas A&M University System Health Science Center, Dallas, TX, USA
7Department of Oral Biology, School of Dentistry, Medical College of Georgia, Augusta, GA USA

Tóm tắt

Abstract

Aim  To examine the dislocation resistance of three root canal sealers from radicular dentine with and without immersion in a simulated body fluid (SBF), using a modified push‐out test design that produced simulated canal spaces of uniform dimensions under identical cleaning and shaping conditions.

Methodology  Sixty single‐rooted caries‐free human canine teeth were used. Standardized simulated canal spaces were created using 0.04 taper ProFile instruments along the coronal, middle and apical thirds of longitudinal tooth slabs. Following NaOCl/ethylenediamine tetra‐acetic acid cleaning, the cavities were filled with ProRoot Endo Sealer, AH Plus Jet or Pulp Canal Sealer. After setting, half of the cavities were tested with a fibre‐optic light‐illuminated push‐out testing device. The rest were immersed in SBF for 4 weeks before push‐out evaluation. Failure modes were examined with stereomicroscopy and field emission (FE)‐scanning electron microscopy.

Results  Location of the sealer‐filled cavities did not affect push‐out strengths. ProRoot Endo Sealer exhibited higher push‐out strengths than the other two sealers particularly after SBF storage (P < 0.001). Failure modes were predominantly adhesive and mixed for Pulp Canal Sealer and AH Plus Jet, and predominantly cohesive for ProRoot Endo Sealer. Spherical amorphous calcium phosphate‐like phases that spontaneously transformed into apatite‐like phases were seen in the fractured specimens of ProRoot Endo Sealer after SBF storage.

Conclusions  When tested in bulk without a main core, both ‘sealer type’ and ‘SBF storage’ were significant in affecting push‐out results. The ProRoot Endo Sealer demonstrated the presence of spherical amorphous calcium phosphate‐like phases and apatite‐like phases (i.e. ex vivo bioactivity) after SBF storage.

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International Endodontic Journal

Tập 42 Số 1

34-46

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