Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “ROOT CANAL OBTURATION”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 1,027 records · Page 57Linked to original sources
PubMed1991

Effectiveness of halothane used with ultrasonic or hand instrumentation to remove gutta-percha from the root canal.

This study compared halothane and chloroform used with hand or ultrasonic instrumentation to remove gutta-percha and sealer from root canals. Apically extruded debris, residual debris, time for filling removal, and amount of solvent used were determined. The differences in extruded apical debris and radiographically visible residual debris were not significant (p greater than 0.05). Ultrasonic instrumentation required significantly less time to remove the root canal filling than did hand instrumentation (p = 0.02). The only significant difference in the amount of solvent used occurred when the ultrasonic-chloroform group was compared with the hand instrumentation-chloroform group (p = 0.05). Halothane was found to be an acceptable alternative to chloroform for removing gutta-percha and sealer from the obturated root canal.

Analysis of Variance↗
PubMed1999

Surgical extrusion of crown-root-fractured teeth: a clinical review.

AIM: In this clinical study combined surgical and endodontic treatment was performed in 20 cases of crown-root fracture and the outcomes reviewed. METHODOLOGY: Surgical treatment involved a conventional extraction and stabilization technique. Root canal treatment using calcium hydroxide was performed. Before root canal obturation, a calcium hydroxide dressing was maintained for 3 months. RESULTS: Follow-up examinations, which varied between 6 and 36 (mean 14.5) months, showed that there were no radiographic and clinical signs of progressive root resorption, marginal bone loss or periapical disease in all except one case. CONCLUSIONS: The favourable results of this study demonstrate that surgical extrusion in teeth with crown-root fractures may be an alternative treatment to orthodontic extrusion.

Adolescent↗
PubMed1996

Microleakage of human saliva through dentinal tubules exposed at the cervical level in teeth treated endodontically.

This study investigated the possibility of saliva recontamination occurring between the root canal wall and sealer through dentinal tubules exposed after the cementum was removed at the cervical level by root planing and treatment with citric acid. Thirty-four extracted human maxillary anterior teeth were randomly placed into five groups after chemomechanical preparation and obturation with gutta-percha and sealer; the sealer was allowed to set for 48 h. A ring 3 mm high, at the cervical level, was subjected to root planing, with complete removal of the cementum. All specimens were coated with two layers of nail polish and two layers of sticky wax, except for the ring subjected to root planing that was treated with citric acid for 30 s. The specimens were exposed to human whole saliva for 20 to 80 days and then immersed in dye to determine microleakage. Specimens were cleared and measurements made to the maximum point of dye penetration. All of the specimens exposed to saliva showed leakage except for the negative control, wherein no dye penetration was seen. Where leakage was found, the dye penetrated between the canal walls and the sealer to increasing depths, proportional to the time of exposure to the saliva. Statistical analysis confirmed these data, evidencing a difference between the means, which was highly significant for all pairs.

Analysis of Variance↗
PubMed2005

In vitro evaluation of three techniques to obturate 0.06 taper canal preparations.

The aim of this study was to evaluate the ability of three obturation methods to seal root canals prepared using 0.06 taper rotary instruments. Forty-five extracted human single-rooted teeth were instrumented with 0.06 taper Profile nickel-titanium rotary files and randomly divided into three experimental groups containing 15 teeth each. The first group was obturated using the System B technique with 0.06 taper standardised gutta-percha points, the second group was obturated using the System B technique with non-standardised MF gutta-percha points, the third group was obturated by cold lateral condensation technique using standardised 0.02 taper master gutta-percha points. Apical leakage of the roots was evaluated by dye penetration using a stereomicroscope after sectioning the roots. The group obturated using System B and 0.06 taper gutta-percha points showed the least dye penetration. However, the difference in the linear extent of dye penetration was not statistically significant.

Coloring Agents↗
PubMed1998

Dens invaginatus in a primary canine: a case report.

This article describes an unusual case of dens invaginatus in a primary canine. A 5-year-old boy presented with an infected mandibular primary canine. A periapical radiograph showed a developmental disturbance in the crown diagnosed as dens invaginatus. A necrotic pulp has been removed from the tooth and the root canal obturated with a resorbable paste. Six weeks later the tooth was found to be asymptomatic. A composite restoration replaced the temporary filling material. Dens invaginatus may appear in the primary dentition, and early diagnosis is important for preventative treatment.

Child, Preschool↗
PubMed1993

Two approaches to the treatment of true combined periodontal-endodontal lesions.

Periodontal endodontal lesions present a difficult diagnostic and treatment challenge to the clinician and treatment often requires a combined therapeutic effort. Both endodontal and periodontal surgical procedures may be indicated for access and treatment of these lesions. This case report presents an early onset periodontitis patient with bilateral periodontal-endodontal lesions on mandibular first molars. Treatment included apical surgery followed by repeated scaling and root planing on one tooth and root canal obturation followed by a periodontal bone grafting procedure on the other. Both procedures resulted in clinical attachment gain as well as radiographic evidence of alveolar bone gain. This case report once again demonstrates that proper diagnosis followed by removal of etiologic factors and nonsurgical therapy or periodontal regenerative procedures can restore health and function in cases of severe attachment loss.

Adult↗
PubMed1990

Endodontic retreatment.

In recent years there has been an increasing interest in endodontic retreatment, dictated by a growing demand to preserve teeth, including those in which endodontic therapy had failed. When observed closely, endodontic retreatment is distinguished from routine endodontic treatment by several aspects, all of which are related to the decision whether, in specific cases, to perform retreatment, surgery or simply nothing. Understanding those aspects of retreatment is essential to its successful practice. No less important is the mastering of retreatment techniques. Because of the presence of coronal and radicular restorations as well as root canal obturation material in many candidate-teeth for retreatment, the planning of retreatment must take both obstacles into consideration. Awareness of each techniques advantages and disadvantages will lead to selection of the proper technique to be employed. The present article focuses on reviewing all those aspects of endodontic retreatment, highlighting those which may be the most important for the clinician's daily use in practice.

Dental Cements↗
PubMedDate not supplied

[Pain after obturation of the root canals].

This study was conducted to determine the incidence and degree of postobturation pain and to determine whether there is a significant relationship between pain and any clinical factors or conditions existing before, during, or at the completion of the root canal therapy. Of the 239 patients included in the study, 203 (84.9%) had no pain during the first 48 hours, 26 (10.9%) had slight pain, 5 (2.1%) had moderate pain and 5 (2.1%) had severe pain. Thirty days after obturation 3 patients had slight pain, 2 patients moderate pain and only one patient had severe pain. Meanwhile, we had to repeat the root canal therapy in 3 cases. Significant relationships were found between postobturation pain and obturation of the root canal past the apical foramen.

Adolescent↗
PubMed2006

The effect of ultrasonic post instrumentation on root surface temperature.

This study measured root surface temperature changes when ultrasonic vibration, with and without irrigation, was applied to cemented endodontic posts. Twenty-six, extracted, single-rooted premolars were randomly divided into two groups. Root lengths were standardized, canals instrumented, obturated, and posts cemented into prepared spaces. Thermocouples were positioned at two locations on the proximal root surfaces. Samples were embedded in plaster and brought to 37 degrees C in a water bath. Posts were ultrasonically vibrated for 4 minutes while continuously measuring temperature. Two-way ANOVA compared effects of water coolant and thermocouple location on temperature change. Root surface temperatures were significantly higher (p < 0.001) when posts were instrumented dry. A trend for higher temperatures was observed at coronal thermocouples of nonirrigated teeth and at apical thermocouples of irrigated teeth (p = 0.057). Irrigation during post removal with ultrasonics had a significant impact on the temperature measured at the external root surface.

Bicuspid↗
PubMed2001

Post retention: the effect of sequence of post-space preparation, cementation time, and different sealers.

Many endodontic sealers contain constituents that have been shown to inhibit the polymerization of resin cements. This may be important when prefabricated posts are cemented at the same appointment as root canal obturation. This study evaluated the effects of cementing posts with a resin cement immediately or at a delayed time period after obturation using Roth's 801 Elite Grade or AH26 sealer cements. The contribution of mechanical post-space preparation was also assessed as a critical variable. One hundred twenty extracted canines were randomly divided into eight experimental groups. The variables evaluated were the order of post preparation (either before or after obturation), the type of sealer used, and the time of post cementation. All teeth received a stainless steel #6 Parapost XP cemented with a resin cement, Panavia 21. Each experimental group underwent tensile testing for retention using an Instron universal testing machine. For both sealers posts cemented in teeth in which the canal was obturated before post-space preparation and thus had sealer-contaminated dentin removed by the space preparation procedure had significantly higher retentive values than those obturated after post-space preparation in which contaminated dentin might remain. Sealer used and time of cementation had no specific effect on retention. Achieving a clean, "freshened" dentinal surface during mechanical post-space preparation seems to be a critical variable for post retention when a resin cement is used.

Analysis of Variance↗
PubMed2000

Resistance of a novel root canal sealer to bacterial ingress in vitro.

A dentin-bonding root canal sealer (ZUT) has been developed, consisting of an experimental glass ionomer cement (KT-308) and an antimicrobial silver-containing zeolite (0.2% by weight). This in vitro study evaluated the ability of ZUT used with or without gutta-percha, to resist bacterial ingress of Enterococcus faecalis over a period of 90 days. Canals of 80 single-rooted teeth were prepared with apical patency and filled as follows (n = 10): KT-308 alone; KT-308 with a single gutta-percha cone (SCGP); ZUT alone; ZUT with SCGP; AH26 alone; AH26 with SCGP; positive control-no root canal filling; and negative control-no root canal filling, with the apices of this group sealed with C&B Metabond cement. Teeth were coated with nail polish except for the apical 2 mm, and each tooth was sealed in a 4-ml glass vial, with an 18-gauge needle inserted through the vial cover and bonded into the pulp chamber with C&B Metabond cement. After sterilization with 2.5 Mrad gamma-radiation, Brain Heart Infusion broth with phenol red was injected into each vial. An inoculum of E. faecalis was pipetted through the needle into the pulp chamber every 5 days, and the broth was monitored daily for color change and turbidity. When change occurred, the broth was cultured for growth of E. faecalis. Kaplan-Meier survival analysis and the log-rank test revealed no significant differences among the three sealers used. The presence of gutta-percha, however, significantly improved resistance to bacterial ingress through obturated root canals (X, p < 0.05). Under the conditions of this study, the hypothesized advantage of ZUT (0.2% zeolite) was not demonstrated.

Anti-Infective Agents, Local↗
PubMed1990

Standardized technique for linear dye leakage studies: immediate versus delayed immersion times.

A dye leakage study was performed in vitro to compare the extent of leakage into root canals obturated with gutta-percha following immediate versus delayed immersion in Indian ink. Sixty extracted human teeth with single canals were instrumented and obturated with gutta-percha and sealer. Each group of 20 teeth was then immersed in the ink either immediately after obturation or after a delay of 1 or 7 days. After 7 days in Indian ink, the teeth were rendered transparent by clearing, and the linear extent of ink penetration was measured with a stereomicroscope. Complete leakage was observed in the two positive control teeth, and no leakage was evident in the two negative controls. Statistical analysis of the results indicated that there was no significant difference in leakage between the three experimental groups.

Analysis of Variance↗
PubMed1995

The smear layer: a phenomenon in root canal therapy.

When the root canals are instrumented during endodontic therapy, a layer of material composed of dentine, remnants of pulp tissue and odontoblastic processes, and sometimes bacteria, is always formed on the canal walls. This layer has been called the smear layer. It has an amorphous, irregular and granular appearance under the scanning electron microscope. The advantages and disadvantages of the presence of smear layer, and whether it should be removed or not from the instrumented root canals, are still controversial. It has been shown that this layer is not a complete barrier to bacteria and it delays but does not abolish the action of endodontic disinfectants. Endodontic smear layer also acts as a physical barrier interfering with adhesion and penetration of sealers into dentinal tubules. In turn, it may affect the sealing efficiency of root canal obturation. When it is not removed, the durability of the apical and coronal seal should be evaluated over a long period. If smear layer is to be removed, EDTA and NaOCl solutions have been shown to be effective, among various irrigation solutions and techniques, including ultrasonics, that have been tested. Once this layer is removed, it should be borne in mind that there is a risk of reinfecting dentinal tubules if the seal fails. Further studies are needed to establish the clinical importance of the absence or presence of smear layer.

Chelating Agents↗
PubMed2005

Efficient correction of endodontic obturation and single-appointment CAD/CAM restoration.

Endodontic treatment, when performed with proper instrumentation, canal disinfection, and obturation can be a tremendous service to a dental patient and a key component of any restorative practice. It can be complicated by factors such as poor diagnosis, incomplete canal debridement, ineffective obturation, bacterial invasion, and insufficient restorative treatment. Retreatment or even tooth loss can occur when the canal space is not handled properly. This article demonstrates a procedure for the correction of pre-existing obturation and subsequent treatment with an all-ceramic restoration in a single visit.

Adult↗
PubMed2002

Variability of master gutta-percha cones.

The common technique to hermetically fill prepared root canals involves the use of "standardised" gutta-percha cones that are selected to fit the apical portion of the prepared canal space. These gutta-percha cones are manufactured to conform to a standard size and taper which should correspond to the size and taper of standard root canal instruments. Clinical observation of commercially available gutta-percha cones seemed to indicate that there is wide variation in the diameter and taper of "standardised" gutta-percha cones within the size range 25-35. The present study was undertaken to determine how closely current commercially available gutta-percha cones sizes 25, 30 and 35 conformed to the current ISO standard, and was initiated by the above clinical observation. It was not the purpose of this study to compare the results from different brands or manufacturers, but rather to establish whether commercially available gutta-percha cones collectively conformed to expected standardised sizes. One phial of cones for each of the sizes 25, 30 and 35 of eight different brands was selected for examination. The diameter of each of ten cones for each size from each brand was measured at two points, at 1 mm and at 6 mm from the tip of the cone. The results obtained for each size and each brand were tabulated and compared with ISO 6877:1995 for dental root canal obturating cones. This study demonstrated wide variability for cones from all brands, for all sizes, when individual cones of the same size were compared. While collectively the arithmetic means showed a closer correlation to the ISO Standard, irrespective of the brand size of the cone, or whether the cone was measured at 1 mm or 6 mm, many individual cones showed a great variation from the ideal. The need for less variability is discussed. It is concluded that ISO standard 6877:1995 is inappropriate- and allows for too much variation in the size of "standardised" gutta-percha cones.

Dental Instruments↗
PubMed2006

Is an oxygen inhibited layer required for bonding of resin-coated gutta-percha to a methacrylate-based root canal sealer?

Removal of the oxygen inhibition layer from the surface of resin-coated gutta-percha cones during packaging has been hypothesized for their weak adhesion to a methacrylate-based root canal sealer, resulting in their frequent delamination from the sealer after root canal obturation. This study examined the feasibility of creating oxygen inhibition layers on resin-coated gutta-percha cones via the adjunctive application of a dual-cured dentin adhesive just before bonding. Composite cylinders were bonded with EndoREZ to flat, resin-coated gutta-percha disks and similar disks that were post-treated with Prime&Bond NT Dual Cure adhesive and stressed to failure using a modified microshear testing design. Although shear strengths for both groups were relatively low, a 5-fold increase in shear strength was observed after adhesive application, with complex interfacial failures instead of complete sealer delamination from the resin-coating. In-situ dentin adhesive application appears to have merits in enhancing the coupling of resin-coated gutta-percha to methacrylate sealers.

Analysis of Variance↗