Smear layer endodontics disclosed papers. Conflict remains regarding the removal of the smear layer before filling root canals, with Pashley DH () Smear layer: physiological considerations. Join ResearchGate to discover and stay up-to-date with the latest research from leading experts. Smear Layer - Download as Word Doc .doc), PDF File .pdf), Text File .txt) or read online. As more and more research and study date pecolated in. . 7. Physiological Considerations of the Smear Layer / orthodontic courses by Indian dental. Date of Submission, Nov The presence of smear layer apical thirds was evaluated using a 5-score .. Smear layer: Physiological considerations.
Smear layer: physiological considerations. - Semantic Scholar
Comparison and evaluation of two reciprocating root canal instruments on removal of smear layer by using two irrigants at apical one-third of the root canal-an ex vivo-scanning electron microscopic study.
J Conserv Dent ; Among the procedures involved in the control of endodontic infection, irrigation procedure may play an important role in the elimination of microorganisms from the root canal. They found it irregular, amorphous, and granular when viewed under the scanning electron microscopic SEM.
For these reason, another irrigant, which has the potential to counteract these adverse effects, are desirable and CHX serves these purposes. It has broad-spectrum antimicrobial activity similar to sodium hypochlorite NaOCl along with a substantive antimicrobial activity.
However, its capacity to clean root canal walls requires further investigation.
Smear layer: physiological considerations. — Augusta University
Irrigation allows for cleaning beyond what might be achievable through instrumentation as it enhances further bacterial elimination, facilitates necrotic tissue removal, and prevents packing of infected debris apically.
Although both system consists of a single file with reciprocating motion, they have different alloy properties and working principles. Shaping the root canal to a continuously tapering funnel not only fulfills the biological requirements for adequate irrigation but also to clean the root canal system of all bacteria, bacterial by-products and pulp tissue, and also provides the perfect shape for three-dimensional obturation.
Different from the traditional NiTi rotary files, the SAF system uses a hollow reciprocating instrument which allows for simultaneous irrigation throughout the mechanical preparation. When inserted into the root canal, the manufacturer claims that the SAF is capable of adapting itself to the canal shape three-dimensionally.
The instrument is used in a transline in-and-out motion and the abrasive surface of the lattice threads promotes a uniform removal of dentin. Selection of samples Forty intact human maxillary anterior teeth with single canals where selected for the study, disinfected in thymol, cleaned of debris and stored in saline. Root canal preparation The teeth were decoronated at the cementoenamel junction to obtain a standardized length of 13 mm, with a diamond disc under water coolant which provide direct access to the root canal.
The roots were randomly assigned into four experimental groups with 10 teeth in each group.
Smear layer: physiological considerations.
The root canals were instrumented using respective techniques. Initial preparation of root canals Number 15 K-file were introduced into the root canals, until it was visible at the apical foramen of each root canal subsequently by subtracting 1 mm from this point.
The canals were instrumented manually up to number 25 K-file using saline as an irrigant. WaveOne reciprocating system 20 root canals was prepared using WaveOne WO instrument according to manufacturer's instructions. WO Primary file which has a tip size of 0. The samples was irrigated using gauge closed end needle with plastic syringe keeping it 2 mm short of the working length for 6 min following below mentioned protocol. Self-adjusting file system A self-adjusting file SAF was used to prepare the root canals according to the manufacturer's instructions, and irrigation was performed continuously during the instrumentation using a special irrigation apparatus VATEA irrigation Device ReDent-Nova, Israel.
This apparatus has two separate irrigation reservoir connected to a hollow SAF file. The effectiveness of final rinsing solution has been an established phenomenon for removal of smear layer after the cleaning and shaping of the root canal system. The percentage and depth of sealer penetration in dentinal tubules may act as an indicator for degree of smear layer removal after the final irrigation.
Materials and Methods Thirty single rooted mandibular premolars, which were extracted for Orthodontic purpose, were taken for this study.
The teeth were examined under operating loupes for cracks and defects and such teeth were excluded. The access cavities were prepared and the teeth were checked for the presence of a single root canal. Selected teeth were stored in isotonic saline. Each tooth was decoronated and root length standardized at 16 mm measured from the apex of the tooth to the cementoenamel junction CEJ.Demystifying Medicine 2017: Addison’s Disease meets Chromatin Biology
A size k file Mani, Tokyo, Japan was inserted into canal until its tip was just visible at the apical foramen and length was measured. Working length was determined by subtracting 1 mm from the measured length so that the length of the sample was 15 mm. Instrumentation was done by combination of step back and crown down technique. Coronal preparation was done using gate-glidden drills Mani, Tokyo, Japan Nos. Nearly 4 ml of irrigant was used for each sample with the help of side vent needles.
The canals were then irrigated with 4 ml normal saline solution and dried with paper points. The teeth were mounted on resin to facilitate handling of the samples. The Acroseal Septodont, India sealer was dispensed and mixed with approximated concentration 0. The sealer was applied in root canals using No.
The sealer was applied to snugly fitting master cones and the cones were placed in the root canals and the obturation was done with a lateral condensation technique. After 48 hours, 1 mm thick cross sections were cut from each coronal, middle, and apical section of the mounted acrylic blocks. The sections were sub grouped as A coronalB middleC apical under each group.
The samples were cleaned under tap water for removal of any debris and dried. The specimens obtained were subjected to confocal laser scanning microscope CLSM Olympus FVGermany to evaluate the depth of sealer penetration at 10x. The depth of penetration of sealer was measured from the lumen of the canal to maximum depth penetrated into the tubules and an average of values was taken into account. The measurements were taken with the help of Olympus FLV software.
The evaluated specimens showed fluorescence throughout the circumference of the root canal lumen, but the penetration of the sealer was not equal into the dentin all around the canal walls.