Humans ; Root Canal Obturation

OBJECTIVETo explore the nursing methods during canal obturation in order to improve efficiency and quality of root canal therapy.

METHODS112 teeth treated by complete root canal preparation were chosen to fill the root canal, and the main points of nursing during canal obturation were summarized.

RESULTSAll of 112 teeth nursed strictly during canal obturation obtained satisfactory efficiency. No one failed after root canal therapy.

CONCLUSIONThe main points of nursing during canal obturation are the aseptic technique, skilled coordination, instrument management, communication between nurses and patients.

OBJECTIVETo investigate the effects of post space preparation and post restoration on apical sealing ability.

METHODS60 extracted mandibular premolars each with single canal were selected. All canals were prepared by manual ProTaper instrument using crown-down technique. The samples were the divided into 5 groups randomly. Group A: 20 samples, the immediate post space preparation group; group B: 20 samples, the delayed post space preparation group; group C: 10 samples, the intact group; group D: 5 samples, a positive control; group E: 5 samples, a negative control. There were two subsets in groups A and B which were restored by temporary materials (A1 and B1) or fiber post and cores (A2 and B2). Indian ink dye method was used to measure the apical leakage in stereomicoscope.

RESULTSThe mean length of dye penetration for group A1, A2, B1, B2 and C were (0.52 +/- 0.47), (0.49 +/- 0.44), (1.17 +/- 0.77), (1.12 +/- 0.54), and (0.23 +/- 0.40) mm, respectively. Positive group demonstrated maximum dye penetration, and negative group showed no dye penetration. There was no statistically significant difference between group A1, A2 and group C (P>0.05). However, there were statistically significant differences between group B and group A, C (P<0.05). The length of dye penetration for group B was longer than that for group A and C.

CONCLUSIONThe sealing ability was decreased after delayed post space preparation when using the AH-Plus sealer.

OBJECTIVETo compare the sealing ability and fracture resistance of roots endodontically treated with bonded and unbonded filling materials.

METHODSOne hundred and fifteen straight mandibular premolar teeth with single canal were divided randomly into 6 experimental groups, with 15 samples each, and 3 control groups. The sealing ability was evaluated using a glucose quantitative microleakage mode and fracture resistance was tested by universal testing machine.

RESULTSThe microleakage results showed that the bonded filling material had the lowest value while the unbonded filling material had the highest value in all groups. There were significant differences in microleakage value among the groups (P < 0.01), but no significant difference was noted in the fracture resistance among the testing groups (P = 0.7016).

CONCLUSIONSBonded filling material enhanced the sealing ability but could not reinforce the fracture resistance of endodontically treated teeth.

Root canal filling is performed as the final and most important procedure of root canal treatment. The superior 3D filling is the key determinant of endodontic success. However, such procedure remains a challenge because of the complexity of the root canal system and the limitation of root canal filling materials and methods. This paper provides an overview of current principles and practices in root canal filling, focusing on advantages, disadvantages and indications. The process errors and countermeasures in various root canal filling methods are also discussed. This review provides guidance and help for clinical and practice to achieve a satisfactory root canal filling and improve root canal treatment outcome.
Dental Pulp Cavity ; Humans ; Root Canal Filling Materials ; Root Canal Obturation ; Root Canal Therapy

OBJECTIVETo assess the two-year outcome of initial endodontic treatment and evaluate the relationship between the treatment outcome and relevant factors.

METHODSA total of 296 patients with 371 teeth received initial endodontic treatment between January 2005 and December 2007 were included in the study. The teeth were treated using crown down technique, and followed for two years. The outcome was examined clinically and radiographically. The relevant factors, including pulp vitality, apical periodontitis, the number of tooth root, and state of root canal obturation, were analyzed.

RESULTS143 (176 teeth) from 296 patients (371 teeth) were followed for two years. 152 teeth (86.36%) with normal limits were assessed as "healed" (no apical periodontitis, no signs or symptoms). 24 teeth were assessed as "disease", 12 teeth were extracted and 12 teeth were retreated. The healing rate(HR) was statistically higher for vital teeth (95.38%) than that for devital teeth (81.08%). The HR of teeth without apical periodontitis (95.24%) was significantly higher than that with apical periodontitis (73.24%). Other factors were associated with different HR, but no statistical significance (P>0.05).

CONCLUSIONApical periodontitis and pulp vitality may be prognostic factors for outcome of initial endodontic treatment.

Humans ; Root Canal Filling Materials ; Root Canal Obturation ; methods ; Tooth Root ; physiopathology

While it is reasonably well known that certain dental procedures increase the temperature of the tooth's surface, of greater interest is their potential damaging effect on the pulp and tooth-supporting tissues. Previous studies have investigated the responses of the pulp, periodontal ligament, and alveolar bone to thermal irritation and the temperature at which thermal damage is initiated. There are also many in vitro studies that have measured the temperature increase of the pulp and tooth-supporting tissues during restorative and endodontic procedures. This review article provides an overview of studies measuring temperature increases in tooth structures during several restorative and endodontic procedures, and proposes clinical guidelines for reducing potential thermal hazards to the pulp and supporting tissues.
Periodontal Ligament ; Root Canal Obturation ; Tooth ; Tooth Preparation ; Ultrasonics

The purpose of this study was to evaluate the obturation efficiency of a non-standardized gutta-percha cone in curved root canals prepared with 0.06 taper nickel-titanium instruments. Sixty simulated curved root canals in clear resin blocks were prepared with crown-down technique using 0.06 taper rotary ProTaper(TM) and ProFile (Dentsply-Maillefer) until apical canal was size 30. Root canals were randomly divided into 4 groups of 15 blocks and obturated with cold-laterally compacted gutta-percha technique by using either a non-standardized size medium gutta-percha cone or an ISO-standardized size 30 one as a master cone. Gutta-percha area ratio were calculated at apical levels of 1, 3, and 5 mm using AutoCAD 2000 after cross-sectioning, and the data were analyzed with one-way and two-way ANOVAs and Duncan's multiple range test. Non-standardized size medium cone groups showed significantly higher gutta-percha area ratio than standardized cone groups at all apical levels (p < 0.01). Non-standardized cone groups used significantly less accessory cones than standardized cone groups (p < 0.01).
Dental Pulp Cavity* ; Gutta-Percha* ; Root Canal Obturation

Root canal treatment in three dimensions is the best technique in the world. In this study, 30 teeth with 81 rood canals are obturated with heat carries. The propotion of lateral canal is 30.86% and the propotion of success is 92.59%. It is the advantage of the technique. This technique is applicable in our working condition with heat carries and bunsen burner
Dental Pulp Cavity ; Dental Pulp Diseases ; therapeutics ; Root Canal Obturation