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Azerbaycan Saytlari

 »  Home  »  Endodontic Articles 11
Endodontic Articles 11

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» The effects of dentine pretreatment on the adhesion of root-canal sealers
By JofER editor | Published 10/8/2008 | Endodontic Articles 11 | Unrated
I.M. Saleh, I.E. Ruyter, M. Haapasalo & D. Orstavik
NIOM, Scandinavian Institute of Dental Materials.
Department of Endodontics, Institute of Clinical Dentistry, University of Oslo, Norway.


Aim.
The adhesion of five root-canal sealers to dentine and gutta-percha was studied. The effects of various dentine pretreatments on adhesion were also investigated.

Conclusions.
The sealers varied markedly in their adhesion to dentine and gutta-percha. The effects of the various dentine pretreatments on adhesion differed amongst the sealer types. Pretreatment with E DTA showed no effect or produced weaker bonds than controls, suggesting that removal of the smear layer may impair sealer adhesion to dentine. Phosphoric and citric acid pretreatments increased adhesion to a zincoxide-eugenol-based sealer. Consideration should, therefore, be given to appropriate selection of dentine pretreatment for various sealer types.
» Immunohistochemical localization of cyclooxygenase-2 in radicular cysts
By JofER editor | Published 10/3/2008 | Endodontic Articles 11 | Unrated
C.-H. Tsai, F.-M. Huang, L.-C.Yang, M.-Y.Chou & Y.-C. Chang
Department of Oral Pathology, Department of Dentistry, Chung Shan Medical University Hospital, and 3School of Dentistry, Chung Shan Medical University, Taichung, Taiwan.

Aim.
The purpose of this study was to investigate the expression of cyclooxygenase-2 (COX-2) in radicular cysts.

Conclusions.
In the present study, immunoreactivity of COX-2 was expressed in the lining epithelium and subepithelial fibroblasts, macrophages and endothelial cells in all radicular cyst specimens. COX-2 expression was also noted in the endothelial cells of some small capillaries in the fibrous connective tissue wall with a marked inflammatory cell infiltrate. Moreover, COX-2 expression is significantly higher in radicular cysts. Taken together, COX-2 expression may play an important role in the pathogenesis of radicular cysts.
» Surface analysis of ProFile instruments by scanning electron microscopy and X-ray energy-dispersive spectroscopy: a preliminary study
By JofER editor | Published 10/3/2008 | Endodontic Articles 11 | Unrated
R. C. Martins, M. G. A. Bahia & V.T. L. Buono
Department of Restoration Dentistry, Faculty of Dentistry, Department of Metallurgical and Materials Engineering, Engineering School, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil.

Aim.
The purpose of this preliminary study was to analyze surface irregularities on ProFile nickel-titanium (NiTi) rotary instruments before use, after sterilization by two different methods and after instrumentation of molar root canals.

Conclusions.
During canal preparation, dentine adhered to surface deposits found on new ProFile instruments. This potential problem indicates a need to re-evaluate the process employed for machining these instruments and to review the cleaning methods currently in use.
» Comparison of Diaket and MTA when used as root-end filling materials to support regeneration of the periradicular tissues
By JofER editor | Published 10/3/2008 | Endodontic Articles 11 | Unrated
J. D. Regan, J. L. Gutmann & D. E.Witherspoon
Department of Restorative Sciences, Baylor College of Dentistry, Texas A&M University System Health Science Center, Dallas, TX, USA.
Private Practice Limited to Endodontics, Dallas, TX, USA.


Aim.
The objective of this study was to evaluate on a comparative basis the potential for mineral trioxide aggregate (MTA) and Diaket to promote periradicular tissue regeneration when used as surgical root-end filling materials.

Conclusions.
Both Diaket and MTA can support almost complete regeneration of the periradicular periodontium when used as root-end filling materials in periradicular surgery on noninfected teeth.
» Micro-tensile bond strengths of bonding agents to pulpal floor dentine
By JofER editor | Published 09/27/2008 | Endodontic Articles 11 | Unrated
K. Kijsamanmith, S.Timpawat, C.Harnirattisai & H. H. Messer
Dental Section, Donjedi Hospital, Supanburi Province, Bangkok, Thailand.
Department of Operative Dentistry, Faculty of Dentistry, Mahidol University, Bangkok, Thailand.
School of Dental Science, The University of Melbourne, Melbourne, Australia.


Aim.
The purpose of this study was to characterize the dentine surface of the pulpal floor and to determine the micro-tensile bond strengths of two dentine adhesive systems used in conjunction with a resin composite core material to pulpal floor dentine.

Conclusions.
Bonding to pulpal floor dentine was weaker than previously reported for cut coronal dentine. The self etching priming system bonded more strongly than the ‘one-bottle’ system. In view of the irregular surface morphology and absence of a smear layer, etching conditions may need to be adapted for bonding to pulpal floor dentine.


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