Related Experiment Videos
Permeability of remaining endodontic obturation after post preparation
Celio Jesus Prado1, Carlos Estrela, Heitor Panzeri
1Department of Removable Prosthesis and Dental Materials, Federal University of Uberlandia, School of Dentistry, Minas Gerais, Brazil.
General Dentistry
|February 24, 2006
Summary
Immediate post preparation reduced root canal leakage from the cervix to the apex compared to delayed preparation. This finding is crucial for improving the longevity of dental restorations involving posts.
Area of Science:
- Endodontics
- Restorative Dentistry
- Dental Materials Science
Background:
- Post preparation is a critical step in root canal treatment.
- Microleakage can compromise the long-term success of endodontically treated teeth.
- The timing of post space preparation relative to obturation may influence coronal seal.
Purpose of the Study:
- To evaluate the correlation between cervical and apical leakage in root canals.
- To compare leakage following immediate versus delayed post preparation techniques.
- To assess the directionality of microleakage (cervix-to-apex vs. apex-to-cervix).
Main Methods:
- Sixty root canals were obturated using gutta-percha and AH Plus sealer.
- Roots were divided into immediate and delayed post preparation groups.
- Dye penetration (India ink) and clearing techniques assessed microleakage.
Main Results:
- Microleakage was observed in all samples.
- No significant difference in apex-to-cervix leakage between immediate and delayed groups.
- Significantly lower cervix-to-apex leakage was observed with the immediate post preparation technique.
Conclusions:
- Immediate post preparation may provide a superior coronal seal.
- The timing of post space preparation influences the directionality of microleakage.
- Further research is warranted to optimize post preparation protocols for enhanced restoration longevity.
Related Concept Videos
01:25Permeability of Concrete
Permeability in the context of concrete refers to how easily liquids or gases can pass through the material. This quality is crucial for assessing the water-tightness and durability of concrete structures and their resistance to chemical attacks. Concrete permeability can be determined through comparative laboratory tests. These tests typically involve sealing a concrete specimen from the sides, applying water pressure to the top surface with pressure, and measuring the amount of water passing...
01:18Porosity in Cement Paste
The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is critical—it...
The balance of water to cement in the mix is critical—it...
01:20Porosity and Absorption of Aggregate
Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the aggregate...
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the aggregate...