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Comparison of debris extruded apically and working time used by ProTaper Universal rotary and ProTaper retreatment system during gutta-percha removal
Uezu, Mary Kinue Nakamune;Britto, Maria Leticia Borges;Nabeshima, Cleber K.;Pallotta, Raul Capp;
Journal of Applied Oral Science , 2010, DOI: 10.1590/S1678-77572010000600002
Abstract: objective: the aim of this study was to evaluate the in vitro action of protaper retreatment files and protaper universal in the retreatment of mandibular premolars. material and methods: the amount of debris extruded apically was measured and the time to reach the working length and to complete the removal of gutta-percha was observed. thirty teeth had their canals prepared using protaper universal files and were obturated by the single cone technique. the teeth were then stored at 37oc in a humid environment for 7 days. during the use of the rotary instruments for root canal filling removal, the apical portions of the teeth were attached to the open end of a resin tube to collect the apically extruded debris. results: protaper universal files were significantly faster (p=0.0011) than the protaper retreatment files to perform gutta-percha removal, but no significant difference was found between the files regarding the time to reach the working length or the amount of apical extrusion. conclusions: protaper universal rotary had better results for endodontic retreatment, and both techniques promote similar apical extrusion of debris.
Apically extruded debris with three contemporary Ni-Ti instrumentation systems: An ex vivo comparative study  [cached]
Logani Ajay,Shah Naseem
Indian Journal of Dental Research , 2008,
Abstract: Aim: To comparatively evaluate the amount of apically extruded debris when ProTaper hand, ProTaper rotary and ProFile systems were used for the instrumentation of root canals. Materials and Methods: Thirty minimally curved, mature, human mandibular premolars with single canals were randomly divided into three groups of ten teeth each. Each group was instrumented using one of the three instrumentation systems: ProTaper hand, ProTaper rotary and ProFile. Five milliliters of sterile water were used as an irrigant. Debris extruded was collected in preweighed polyethylene vials and the extruded irrigant was evaporated. The weight of the dry extruded debris was established by comparing the pre- and postinstrumentation weight of polyethylene vials for each group. Statistical Analysis: The Kruskal-Wallis nonparametric test and Mann-Whitney U test were applied to determine if significant differences existed among the groups ( P < 0.05). Results: All instruments tested produced a measurable amount of debris. No statistically significant difference was observed between ProTaper hand and ProFile system ( P > 0.05). Although ProTaper rotary extruded a relatively higher amount of debris, no statistically significant difference was observed between this type and the ProTaper hand instruments ( P > 0.05). The ProTaper rotary extruded significantly more amount of debris compared to the ProFile system ( P < 0.05). Conclusion: Within the limitations of this study, it can be concluded that all instruments tested produced apical extrusion of debris. The ProTaper rotary extruded a significantly higher amount of debris than the ProFile.
Comparing a conventional and three rotary instrumentation techniques with regard to the amount of apically extruded debris
Zarrabi MH.,Bidar M.,Jafarzadeh H.
Journal of Dental Medicine , 2007,
Abstract: Background and Aim: Mechanical preparation of canal is one of the most important stages in root canal therapy. Various kinds of hand or rotary techniques are used for mechanical preparation of canal and each of them has advantages and disadvantages. During canal preparation, extrusion of debris from the apical foramen can result in periapical inflammation and increased pain and edema. The aim of this study was to compare hand instrumentation technique with three rotary systems (Profile, Race, Flex Master) regarding the amount of extruded debris from apical foramen during canal preparation. Materials and Methods: In this experimental in vitro study, one hundred human extracted single rooted mandibular premolars with curvature between 0-10 degrees were selected and divided into four groups of 25 teeth each. All teeth were shortened to 15 mm length by cutting the crown. Group H was prepared by hand step back technique, group P by Profile system, group R by Race system and group F by Flex Master system. For debris collection, vials containing distilled water were used which were weighed before preparation. After the end of canal preparation, vials were completely dried and weighed again. The difference between weights of vials in two stages was the weight of debris extruded from apical foramen. The groups were compared by One-way ANOVA with p<0.05 as the level of significance. Results: Group H had the highest mean weight of debris which showed significant difference with all three rotary groups (P<0.001). The lowest mean weight of debris was observed in group R (Race) which was significantly different from group F (Flex Master) but not significantly different from group P (Profile). Conclusion: Based on the results of this study, race rotary system caused less debris extrusion from apical foramen compared to hand step back technique and Flex Master rotary system.
The performance of ProTaper system during the endodontic retreatment
Erica Lopes FERREIRA,Flares BARATTO FILHO,Rivail Ant?nio Sérgio FIDEL,Luiz Fernando FARINIUK
RSBO , 2006,
Abstract: The development of new rotary instruments for endodontic treatmentdemands new studies to evaluate their efficacy on the retreatment ofroot canals. The scope of this study was to analyze the partial or total removal of the filling material by the ProTaper system in the retreatment of gutta-percha-filled root canals, as well as the time required to reach the previous working length. Thirty-six human canines were equally divided in three groups (n=12) and had their root canals prepared by the following methods: GI=Thermafill system; GII=McSpadden; GIII-lateral condensation. After that, all specimens were retreated without solvent and using the ProTaper system. The time necessary to remove the filling material was registered. After the removal of the filling material,the specimens were sectioned longitudinally and magnified images of the sections were recorded and printed. The presence or absence of remaining filling material was registered. The results showed a significant statistical difference between the McSpadden group and the others with relation to the time required for filling removal. All groups exhibited an incomplete removal of the filling material. It can be concluded that although the rapidity that the ProTaper instruments reached the working length, the system has to be associated to another retreatment.
The importance of microsonics concept for optimization of endodontic retreatment outcome: a case report
Cláudia Fernandes de Magalh?es Silveira,Carlos Eduardo Fontana,Felipe Davini,Roberta Aranha de Araújo Arruda
RSBO , 2012,
Abstract: Introduction: During the past few decades, the endodontic treatment has benefited from the development of new techniques and devices, which have improved the outcome and predictability. Important attributes such as the operating microscope and ultrasonics have found indispensable applications in a number of dental procedures in endodontics. Objective and case report: This study describes a case of endodontic retreatment of a maxillary first molar in which the second mesiobuccal canal could be located by extending the access to the mesial direction further than usual and by a closer inspection of the pulp chamber floor. Conclusion: The “microsonics concept” has enhanced the quality of endodontic treatment and retreatment, becoming increasingly more useful in applications such as localization of root canal orifices.
Orthograde endodontic retreatment of teeth with individual cast posts: Report of two cases  [PDF]
Rami? Bojana,Stojanac Igor,Premovi? Milica,Drobac Milan
Srpski Arhiv za Celokupno Lekarstvo , 2012, DOI: 10.2298/sarh1208495r
Abstract: Introduction. The failure of primary endodontic treatment is manifested by various clinical symptoms following endodontic therapy or, more frequently, by the development of chronic inflammatory process in the apex region without any subjective symptoms. In case of unfavorable outcome of the primary endodontic treatment, orthograde endodontic retreatment is the method of choice for a prolonged therapy. Outline of Cases. Two female patients, 47 and 44 years old, were presented at the Dental Clinic of Vojvodina for endodontic retreatment of teeth 22, 23 and 13, within the repeated prosthetic restoration. Intraradicular individual cast posts were removed using ultrasonic instruments. Remains of gutta-percha were removed by engine driven rotary re-treatment files, root canals were shaped and cleaned using the crown-down technique, and obturated with gutta-percha and epoxy-resin-based sealer using the lateral compaction technique. Conclusion. When there are metal posts or broken instruments in the root canal, the use of ultrasonic instruments is considered a safe method characterized by negligible tooth substance loss and minimal root damage causing fractures and perforations, and the entire procedure is effective and predictable. Non-surgical orthograde endodontic retreatment, when properly performed in accessible and penetrable root canals, achieves a high cure rate, good and lasting results and eliminates the need for radical procedures, such as apical surgery or tooth extraction. When nonsurgical endodontic retreatment is done, treated teeth must be restored by full coronal coverage as soon as possible, to prevent coronal leakage or fracture.
Assessment of the effectiveness of different rotary instruments in endodontic retreatment  [PDF]
Juarez Sátiro GARCIA JúNIOR,Ulisses Xavier da SILVA NETO,Everdam CARNEIRO,Vania Portela Ditzel WESTPHALEN
RSBO , 2008,
Abstract: Objective: The purpose of this study was to compare in vitro theeffectiveness of removing guta-percha from root canals using differents rotatory instruments. Material and methods: Sixty human inferior premolars have been used, which were instrumented with GT hand files up to #30 taper .04 and obturated using Tagger’s hybrid technique.The retreatment has been based in the following instruments: ProFile(group I), ProTaper (group II), GT (group III), Manual-Control (group IV), K3 (group V), and Hero (group VI). Radiographies were taken in vestibular orientation, scanned at resolution 480DPI and analyzed by computer for the observation of the remnant parts of obturation materials after retreatment. The roots have been divided in 1/3 cervical,medium and apical, and scores were attributed as per the following scale: 0 (absence of remnant materials), 1 (up to 25%), 2 (up to 50%),and 3 (over 50%). The scores of obturation remnant materials for the differents tested instruments were statistically assessed by means of the Krusckal-Wallis’ method. Results: There was statistical difference among the instruments (p < 0.01). The group instrumented using Hero and K3 differed from the remaining groups, which presented best results. The control group (manual), in spite of presenting low values,as well as the remaining groups, when appraised by thirds has shown a greater quantity of remaining material at the apical third. Conclusion:The ProFile, ProTaper, GT, and Manual groups have presented more outstanding results, notwithstanding the absence of meaningful statistical difference among them.
Postoperative pain after primary endodontic treatment and retreatment of asimptomatic teeth  [PDF]
Petrovi? Violeta,Opa?i?-Gali? Vanja,?ivkovi? Slavoljub
Stomatolo?ki Glasnik Srbije , 2011, DOI: 10.2298/sgs1102075p
Abstract: Introduction. Postoperative pain may develop after chemomechanical preparation during endodontic treatment or retreatment. It is associated with acute apical periodontitis caused by bacteria penetrated from the root canal into the periapical tissue. The purpose of this study was to evaluate the incidence of postoperative pain during endodontic treatment after intracanal medication performed with calcium hydroxide (CH) paste or 1% chlorhexidine gel (CHX). Material and Methods. The study included 22 asymptomatic teeth in both male and female patients. Fourteen teeth had the diagnosis of pulp necrosis and the other eight were retreatment cases. The root canals were prepared by crown-down technique using K files and copious irrigation with 0.5% sodium hypochlorite (NaOCl). Intracanal dressing was performed using either calcium hydroxide paste or 1% CHX gel. Each medicament was placed in the root canals of eleven randomly selected teeth. The teeth were restored with temporary filling. Postoperative pain was registered during the seven day period between two appointments. The level of pain was rated as follows: no pain, mild pain, moderate pain and severe pain (flare-up). The obtained data was analyzed using Fisher exact test. The level of significance was α=0.05. Results. Postoperative pain was absent in 77.3% of total number of treated teeth. Severe pain (flare-up) was registered in 2 cases (9%). There was no significant difference in pain incidence between the CH paste and CHX gel group (p=0.610). Conclusion. Endodontic procedure used in this study which considered root canal instrumentation and irrigation followed by intracanal medication with CH and CHX resulted in low incidence of postoperative pain.
Intraradicular post and core removal followed by endodontic retreatment: thirteen-year follow-up
Susiane Allgayer,José Roberto Vanni
RSBO , 2011,
Abstract: Introduction: Endodontic retreatment, when properly indicated, allows the maintenance of dental elements. The evolution of endodontic techniques and materials has reduced the indication of surgical procedures even for teeth with intracanal posts. Case study: A 31 year-old patient related pain in tooth #12. After radiographic examination, the presence of a periapical lesion in teeth #12, #11, and #21 was found, which had already undergone to paraendodontic surgery and placement of intraradicular post and core. Treatment comprises the removal of the intracanal post and core, and the respective root canals were endodontically treated. Conclusion: The technique here exemplified, intracanal post removal and retreatment, proved to be well indicated and effective, since, at the 13-year follow-up appointment, the teeth remained without clinical and radiographic findings.
Endodontic retreatment of inferior central incisor with “dentin island” and periapical lesion: case report
Renata Grazziotin SOARES,Luis Eduardo Duarte IRALA,Alexandre Azevedo SALLES,Orlando LIMONGI
RSBO , 2005,
Abstract: In endodontics, it’s of extreme importance that the professionals havemeticulous knowledge of the teeth inner anatomy, in order to have success in their treatments, avoiding accidents and complications. In this study one clinical case, which had the endodontic treatment of an inferior central incisor finished just about one year, was reported, however, the signs and symptoms hadn’t receded, as well as persisted the radio lucid image indicating the periapical lesion. After forwarding the patient to the endodontist for retreatment, the presence of a second non-treated canal was verified. That comes to clarify that the meticulous conscience of the root anatomy of the canals and of their possible variations is of extreme help for the professional, from the access surgery to the filling.
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