Low-temperature (70°C) injection gutta-percha: A scanning electron microscopic investigation

Michanowicz, Andrew E.; Czonstkowsky, Mario; Piesco, Nicholas P.

doi:10.1016/s0099-2399(86)80130-3

Cited by 28 publications

(10 citation statements)

References 12 publications

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“…Leakage studies (2)(3)(4)(5)(6) show that the injectionthermoplasticized gutta-percha obturation technique, when performed using a root canal sealer, has at least the same sealing ability as conventional techniques. Scanning electron microscopic studies (7,8) show that adaptation of the filling material to the dentinal wall is equal to or superior to other conventional approaches. Marlin et al (9) report promising findings in a short-term clinical study of 125 cases.…”

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confidence: 99%

Periodontal tissue reactions following root canal obturation with an injection‐thermoplasticized gutta‐percha technique

Molyvdas¹,

Zervas²,

Lambrianidis³

et al. 1989

Dental Traumatology

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The thermoplasticized gutta-percha obturation technique is a relatively recent development in endodontics. In this study we evaluated the possible effects of heat transmitted to the periodontal tissues when the Obtura root canal filling device was used in dog teeth. Two 8-month-old beagle dogs were used; 56 root canals of 36 teeth (maxillary incisors and first, second and third premolars of both jaws) were divided into two groups. In Group A 26 root canals were obturated with the lateral condensation technique, while in Group B 30 root canals were obturated using the Obtura device, without sealer. Observation periods were 1, 3, 7, 28 and 56 days. After routine laboratory procedures, hematoxylin-eosin stained sections were examined under a light microscope. In this experimental model the thermoplasticized gutta-percha obturation technique caused a periapical inflammatory reaction at all observation periods. Inflammatory reaction and destruction of collagen fibers were localized in the area around the apical delta, while the alveolar founding bone, the roots of the teeth and the periodontal ligament at the side of the root surfaces remained normal.

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mentioning

confidence: 99%

Periodontal tissue reactions following root canal obturation with an injection‐thermoplasticized gutta‐percha technique

Molyvdas¹,

Zervas²,

Lambrianidis³

et al. 1989

Dental Traumatology

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“…Grossman 6 (1981) and other authors 9,12,21 observed a diversity of characteristics, including solubility, flow, setting time, power of compression, radiopacity, and adhesion properties of the root canal sealers. With the introduction of warm gutta-percha techniques, authors have emphasized the necessity to reexamine the in flu en ce of the film thick ness of the se a ler towards the api cal se a ling pro du ced by the fil ling ma te ri al 1,11,13,14,22 .…”

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confidence: 99%

Analysis of the film thickness of a root canal sealer following three obturation techniques

Deus

Martins

Lima

et al. 2003

Pesqui. Odontol. Bras.

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The aim of this study was to obtain a quantitative analysis of the film thickness of a root canal sealer formed after filling by three different techniques. Thirty human maxillary incisors were selected and access cavities were prepared using high-speed diamond stones and water spray. A size #15 K-Flexofile was introduced in the canal of each specimen until it was seen just at the apical foramen. The working length was determined to be 1 mm short of that position and the canals were prepared to an apical size of #45 K-Flexofile. Copious irrigation with 5.25% NaOCl (sodium hypochlorite) was used during and after instrumentation. The samples were divided into three groups and obturated as follows: G1 - lateral condensation, G2 - lateral condensation with an accessory cone, and G3 - continuous wave of condensation. The samples were evaluated in the cervical, middle and apical thirds. The film thickness of the root canal sealer was measured through a microscopic evaluation. Statistical analysis was obtained using the Wilcox test. Statistical analysis showed significant differences between G3 and G1, G3 and G2 (p < 0.05). In general, the lowest film thickness was observed in the continuous wave of condensation (G3). Lateral condensation with an accessory cone (G2) and lateral condensation (G1) demonstrated poorer results in this study, showing a higher film thickness. The small film thickness of the sealer obtained by the continuous wave of condensation technique may increase the clinical performance of this technique.

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“…Injection of thermoplasticized gutta-percha, introduced by Yee et al in 1977 (1), is among them. Since its introduction, various studies have evaluated this technique (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17). Complete 3-dimentional obturation of the root canal system cannot be achieved unless the canals are properly prepared with a technique appropriate for the obturation technique to follow.…”

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confidence: 99%

Apical placement of needle tip with an injection‐thermoplasticized gutta‐percha technique for root canal obturation

Lambrianidis¹,

Veis²,

Zervas³

et al. 1990

Dental Traumatology

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It is recommended that when injection-thermoplasticized gutta-percha is used as the obturation technique, the root canal space should be prepared in such a way that the 23-gauge injection needle tip can be placed at a distance 3 to 5 mm short of the working length. In this study the apical seal and extent of gutta-percha were evaluated when the 23-gauge tip was placed at a distance 4 mm, 6 mm, and 8 mm short of the working length. Ninety-nine human single-rooted mandibular incisors and premolars divided into 3 equal groups were used. Their crowns were separated at the cementoenamel junction and their roots were stored in sodium hypochlorite for 1 week. The roots were then instrumented from size 20 at the working length to size 70:4 mm short of the working length in group A, 6 mm in group B, and 8 mm in group C. Following instrumentation, 3 randomly selected roots of each group were used as control. The remaining 30 roots of each group were covered with aluminium foil and embedded in acrylic blocks. The root canals were then dried, coated with sealer (Roth 811) and obturated by injection of thermoplasticized gutta-percha using the single-phase technique. Vertical condensation followed. The roots were immersed in dye for 3 days and then demineralized, dehydrated and cleared in xylene. Measurements of linear dye penetration for the apical seal and for underextension were done by 2 independent examiners under a stereomicroscope. The results of this study showed no statistically significant difference in leakage between the groups.(ABSTRACT TRUNCATED AT 250 WORDS)

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Low-temperature (70°C) injection gutta-percha: A scanning electron microscopic investigation

Cited by 28 publications

References 12 publications

Periodontal tissue reactions following root canal obturation with an injection‐thermoplasticized gutta‐percha technique

Periodontal tissue reactions following root canal obturation with an injection‐thermoplasticized gutta‐percha technique

Analysis of the film thickness of a root canal sealer following three obturation techniques

Apical placement of needle tip with an injection‐thermoplasticized gutta‐percha technique for root canal obturation

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