Related Experiment Video
Updated: May 9, 2026
07:09
In situ Compressive Loading and Correlative Noninvasive Imaging of the Bone-periodontal Ligament-tooth Fibrous Joint
Published on: March 7, 2014
Fibre post adaptation and bond strength in oval canals
N Scotti1, A Forniglia, E Bergantin
1Department of Surgical Sciences, Dental School Lingotto, University of Turin, Turin, Italy.
International Endodontic Journal
|August 8, 2013
Summary
This study found that while both round and oval fiber posts adapt well in oval canals, using ultrasonic tips with round posts significantly reduces bond strength. Oval posts and dedicated drills offer better bond strength in the coronal region.
Area of Science:
- Endodontics
- Dental Materials Science
- Restorative Dentistry
Background:
- Fiber posts are widely used for root canal treated teeth.
- Optimizing post space preparation and post selection is crucial for successful restoration.
- Understanding the influence of post cross-section and preparation method on bond strength is essential.
Purpose of the Study:
- To compare the bond strength and adaptation of oval and circular fiber posts.
- To evaluate the effect of post space preparation using dedicated drills versus ultrasonic tips.
- To assess these factors in oval root canals.
Main Methods:
- Extracted premolars with oval canals were used.
- Four groups were formed based on post shape (oval/round) and preparation method (drill/ultrasonic).
- Bond strength was measured using push-out tests, and adaptation was evaluated microscopically.
Main Results:
- Both post shapes showed good adaptation, especially in the apical region.
- Higher bond strength was observed in the coronal region when using a dedicated drill and an oval post.
- Ultrasonic tip preparation with round posts led to reduced bond strength.
Conclusions:
- Oval and circular fiber posts exhibit comparable adaptation in oval canals.
- Dedicated drills and oval posts enhance coronal bond strength.
- Ultrasonic tips and round posts may compromise bond strength, increasing the risk of adhesive failure.
Related Concept Videos
01:12Bonding and Strength of Aggregate
The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
01:11Fibril-associated Collagen
Fibril-associated collagens are a type of collagens present in the extracellular matrix with interrupted triple helices or FACIT (Fibril-associated collagens interrupted triple-helices). FACIT help connect and attach the collagen fibrils with each other as well as with other proteins of the extracellular matrix.
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...
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...
01:12Adaptability of Cytoskeletal Filaments
The cytoskeleton is a complex dynamic structure performing varied functions based on cellular requirements. The adaptability of the individual filaments in the cytoskeleton determines their ability to perform various functions within the cell. It can undergo rapid reorganization during processes like cell division or remain stable for several hours as in the interphase. The adaptability of these filaments depends on stringent regulatory mechanisms. The microfilament and microtubules of the...
01:14Cell Adhesion in Plants
Plants have rigid cell walls that are made up of cell wall polysaccharides that mediate cell-cell adhesion. The primary cell walls of plants consist of two independent and interacting polysaccharide networks: a pectin matrix that embeds the second network comprising cellulose and hemicelluloses.
Pectins are complex heteropolymers mainly composed of negatively-charged α-D-glucopyranosyl uronic acid and some neutral glycosyl residues such as α-L-rhamnopyranose, α-L-arabinofuranose, and...
Pectins are complex heteropolymers mainly composed of negatively-charged α-D-glucopyranosyl uronic acid and some neutral glycosyl residues such as α-L-rhamnopyranose, α-L-arabinofuranose, and...
01:15Posttensioned Masonry Walls
Post-tensioned masonry walls use high-strength steel rods or flexible tendons to enhance the strength and efficiency of masonry structures. These elements are securely anchored to the foundation and extend vertically either within the cores of the masonry units or between the masonry wythes. The construction process involves building the wall with these tensioning elements in place and allowing the mortar to fully cure.
Following the curing process, the tensioning begins. Steel rods are...