Full text
| |
| Author(s): |
Fernanda Miori Pascon
Total Authors: 1
|
| Document type: | Doctoral Thesis |
| Press: | Piracicaba, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Faculdade de Odontologia de Piracicaba |
| Defense date: | 2008-11-24 |
| Examining board members: |
Regina Maria Puppin Rontani;
Colin Clark;
Maria Cristina Borsatto;
Angela Scarparo Caldo Teixeira;
José Flávio Affonso de Almeida;
Lourenço Correr Sobrinho
|
| Advisor: | Regina Maria Puppin Rontani |
| Abstract | |
Irrigation solutions, endodontic auxiliary chemical substance, and chelating agents used on root canal treatment might yield changes in the chemical composition and physical properties of dentin surface, and affect its interaction with materials used for coronal sealing. Thus, studies are required to select a suitable chemical agent, which has minimal effects on the mechanical properties of the tooth whilst achieving the desired debridement effect. In order to facilitate the accomplishment of this Thesis, it was divided into three chapters, as described on the following descriptions. Chapter 1: to present a systematic review on the effect of sodium hypochlorite on the mechanical properties of root canal dentin, considering its use as an irrigation solution. Chapter 2: to verify the effects of endodontic irrigants, auxiliaries chemicals substances and chelating agent on the microhardness (Vickers Hardness test) and morphology (Scanning Electron Microscopy) of the pulp chamber dentin in primary and permanent teeth. Chapter 3: to evaluate the effect of endodontic irrigants, auxiliaries chemicals substances and chelating agent on the roughness of the pulp chamber dentin of primary and permanent teeth. Based on literature review it could be concluded that there is strong evidence showing that sodium hypochlorite alters the mechanical properties of root canal dentin, when used as an endodontic irrigant. The use of irrigation solutions decreased the Vickers Hardness Number values for both permanent and primary teeth. Inconclusive results were observed when 17% EDTA was used, since it could not be measured. Sodium hypochlorite provides lower Vickers Hardness Number for primary and permanent teeth, compared with 2% chlorhexidine and control group (saline solution). Morphological alterations were observed when pulp chamber irrigation was performed by 1% or 5.25% sodium hypochlorite associated with 17% EDTA, 17% EDTA, and 2% chlorhexidine gel associated or no with 17% EDTA. Regarding surface roughness, it was concluded that pulp chamber irrigation with 1% and 5.25% sodium hypochlorite associated with 17% EDTA increases pulp chamber roughness of primary and permanent teeth. (AU) | |