New Ultrasonic Tip Decreases Uninstrumented Surface and Debris in Flattened Canals: A Micro–computed Tomographic Study

Santos-Junior, Airton Oliveira; Tanomaru‐Filho, Mário; Pinto, Jáder Camilo; Tavares, Karina Ines Medina Carita; Pivoto-João, Mariana Mena Barreto; Guerreiro-Tanomaru, Juliane Maria

doi:10.1016/j.joen.2020.07.012

Cited by 7 publications

(7 citation statements)

References 32 publications

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“…When observing the images obtained in this study, a larger quantity of empty spaces could be perceived in the cervical and middle thirds of the canals prepared, similar findings to those in other study (Iglecias et al, 2017). The single cone technique showed a larger quantity of cement around the gutta percha cone in the flattened areas (Celikten et al, 2016 ;Santos et al, 2020) and lower volume of gutta percha in flattened canals (Schafer et al, 2012). Irrespective of which system -single or multiple file -being used for this preparation, obturation techniques should be studied to reduce the percentage of voids observed for this root canal morphology.…”

Section: Resultssupporting

confidence: 85%

Adaptation of the single-cone in prepared long oval-shaped canals: a micro-computed tomography study

Velozo

Dantas

Vieira

et al. 2021

RSD

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The present study aimed to evaluate adaptation of the single gutta-percha cone on root canal walls prepared with the two systems, the XP-endo Shaper (XPS; FKG Dentaire, La Chaux-de-Fonds, Switzerland) and ProTaper Next systems (PTN; Dentsply Sirona, Ballaigues, Switzerland) by using micro-computed tomography (micro-CT) technology. Twenty long oval-shaped canals in mandibular incisors were scanned by micro-CT (Skyscan 1172; Bruker microCT, Kontich, Belgium). Two groups were divided into (n = 10) according to the canal preparation protocol: XPS group with an extra 45 s of instrumentation and PTN group. A gutta percha cone, with respect to the protocol used for each group (size 40, .04 taper, XPS and size 40, .06 taper, PTN) was adapted to the canal at the working length of all the samples, and all root canals were filled, using the single-cone technique. The mean values for volume of voids and percentage relative to the mentioned space were correspondingly higher in XPS group than they were PTN group, mean values for volume of voids (3.61 mm3 - 1.92 mm3) and for percentage of voids (39.25% - 23.28%), respectively, significant differences were recorded (p < 0.05) between the two groups (XPS and PTN, Student’s-t test for homogenous variances and Mann–Whitney test). The canals prepared with XPS, in the procedure performed with an extra 45 s of instrumentation, showed a higher volume of voids than those prepared with the PTN system, in obturation of the root canal with the single cone technique.

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Section: Resultssupporting

confidence: 85%

Adaptation of the single-cone in prepared long oval-shaped canals: a micro-computed tomography study

Velozo

Dantas

Vieira

et al. 2021

RSD

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“…The root canal obturation in flattened root canals is a challenge, due to the buccal‐lingual diameter 4 or more times larger than the mesio‐distal diameter (Jou et al, 2004). Since accumulation of debris and uninstrumented surfaces affect the filling capacity of the root canal sealers (Metzger et al, 2010), supplementary ultrasonic protocols (Rivera‐Peña et al, 2019; Santos‐Junior et al, 2020) and instruments with small diameter were used to improve the root canal cleaning (Espir et al, 2018). In the present study, the Flatsonic tip was used in the middle and cervical thirds, and brushing motions using the rotary file ProDesign Logic 25/0.03 in the apical third were used to improve the root canal cleaning, favoring the filling capacity of the flattened areas (Metzger et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

“…Initial scanning was performed using the following parameters: 80 kV X‐ray tube voltages, 300 uA anode current, rotation angle 180°, rotation step 0.5, frame averaging 3, Cu + Al filter, exposure time 125 ms and isotropic voxel size of 35 μm. The root canals were considered flattened when the buccal‐lingual diameter was 4 or more times larger than the mesio‐distal diameter (Jou, Karabucak, Levin, & Liu, 2004) at 9 mm from the radiographic apex (Santos‐Junior et al, 2020). The teeth were divided into two experimental groups ( n = 16), with stratified random sampling, considering the pre‐operative volume of the root canals.…”

Section: Methodsmentioning

confidence: 99%

Micro‐CT evaluation of filling of flattened root canals using a new premixed ready‐to‐use calcium silicate sealer by single‐cone technique

Tavares

Pinto

Santos-Junior

et al. 2020

Microscopy Res & Technique

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The aim of this study was to evaluate the filling ability of a new premixed ready‐to‐use calcium silicate‐based sealer, in comparison with an epoxy resin‐based sealer by the single‐cone technique in flattened root canals. Thirty‐two flattened root canals of maxillary second premolars with buccal‐lingual diameter 4 or more times larger than the mesio‐distal diameter at 9 mm from the radiographic apex were selected. Root canals were prepared using Hyflex EDM 25/0.08 and additional preparation with ultrasonic tip Flatsonic and ProDesign Logic 25/0.03. After preparation, the root canals were filled with two root canal sealers (n = 16): Bio‐C Sealer or AH Plus using the single‐cone technique. Scanning was performed before and after root canal obturation using a Skycan 1176 micro‐computed tomography (micro‐CT) with an isotropic voxel size of 8.74 μm. The percentage of voids was analyzed in the cervical/middle thirds and in the apical third. Data were submitted to the Mann–Whitney test at a significance level of 5%. There was no statistical difference between Bio‐C Sealer and AH Plus (p > .05). The percentage of voids in the cervical/middle thirds was 8.94% (1.33–39.95) for Bio‐C Sealer and 9.30% (1.19–18.00) for AH Plus (p > .05). In the apical third, this percentage was 11.84% (4.85–27.00) for Bio‐C Sealer and 9.21% (1.34–28.78) for AH Plus (p > .05). By using the single‐cone technique, neither Bio‐C Sealer nor AH Plus provided a voids‐free root canal filling. Both sealers had similar filling ability in flattened root canals.

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“…For the t -test in 2 independent groups, previous studies that used micro-computed tomography (micro-CT) to evaluate the preparation of root canals with similar morphology were used to determine the specific effect for each variable: percentage of volume increase of the root canals, 0.9779; debris, 1.2638; and uninstrumented surface area, 1.3909 [ 2 30 ]. For the t -test of dependent means, a previous study was used to determine the effect size for debris (2.7110) and uninstrumented surface area (2.0064) [ 28 ]. The resulting sample size was 12 specimens per group.…”

Section: Methodsmentioning

confidence: 99%

“…Flatsonic ultrasonic tip (Helse Ultrasonic, Santa Rosa de Viterbo, São Paulo, SP, Brazil) is manufactured with stainless steel and has an inverted arrow-shaped tip with a flattening that corresponds to the diameter of an ISO 25 instrument. Flatsonic tip improves the cleaning of oval root canals and flattened distal canals of mandibular molars when used as a complementary preparation [ 26 28 ]. In addition, an increase in the removal of debris from oval root canals was observed when 2 instruments with distinct diameters were used [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

Combination of a new ultrasonic tip with rotary systems for the preparation of flattened root canals

et al. 2021

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Objectives This study evaluated 2 nickel-titanium rotary systems and a complementary protocol with an ultrasonic tip and a small-diameter instrument in flattened root canals. Materials and Methods Thirty-two human maxillary second premolars with flattened canals (buccolingual diameter ≥4 times larger than the mesiodistal diameter) at 9 mm from the radiographic apex were selected. The root canals were prepared by ProDesign Logic (PDL) 30/0.01 and 30/0.05 or Hyflex EDM (HEDM) 10/0.05 and 25/0.08 ( n = 16), followed by application of the Flatsonic ultrasonic tip in the cervical and middle thirds and a PDL 25/0.03 file in the apical third (FPDL). The teeth were scanned using micro-computed tomography before and after the procedures. The percentage of volume increase, debris, and uninstrumented surface area were analyzed using the Kruskal-Wallis, Dunn, Wilcoxon, analysis of variance/Tukey, and paired and unpaired t -tests (α = 0.05). Results No significant difference was found in the volume increase and uninstrumented surface area between PDL and HEDM ( p > 0.05). PDL had a higher percentage of debris than HEDM in the middle and apical thirds ( p < 0.05). The FPDL protocol resulted in less debris and uninstrumented surface area for PDL and HEDM ( p < 0.05). This protocol, with HEDM, reduced debris in the middle and apical thirds and uninstrumented surface area in the apical third ( p < 0.05). Conclusions High percentages of debris and uninstrumented surface area were observed after preparation of flattened root canals. The HEDM, Flatsonic tip, and 25/0.03 instrument protocol enhanced cleaning in flattened root canals.

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New Ultrasonic Tip Decreases Uninstrumented Surface and Debris in Flattened Canals: A Micro–computed Tomographic Study

Cited by 7 publications

References 32 publications

Adaptation of the single-cone in prepared long oval-shaped canals: a micro-computed tomography study

Adaptation of the single-cone in prepared long oval-shaped canals: a micro-computed tomography study

Micro‐CT evaluation of filling of flattened root canals using a new premixed ready‐to‐use calcium silicate sealer by single‐cone technique

Combination of a new ultrasonic tip with rotary systems for the preparation of flattened root canals

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