Effects of calcium hydroxide on physical and sealing properties of canal sealers

Hosoya, Noriyasu; Kurayama, Hiroya; Iino, Fumiaki; Arai, Takashi

doi:10.1111/j.0143-2885.2004.00781.x

Cited by 79 publications

(82 citation statements)

References 15 publications

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“…It can be suggested that the influence of CH in the penetration of AH Plus could be more apparent in middle third, since the apical third has less dentinal tubules The lower sealer penetration in the apical third is also attributed to the ineffective delivery of irrigants and the reduced effectiveness of smear layer removal techniques in the apical region. CH removal is more difficult in the apical third; despite this, it interestingly did not have a role in the tubular penetration of both sealers in the 3-mm level segments (4,21).…”

Section: Discussionmentioning

confidence: 83%

“…Despite various proposed techniques, no technique thoroughly removes the CH dressing (4,21). The conventional syringe irrigation was used to remove the CH dressing before obturation procedures because this method does not require special devices, since the syringe is already used in root canal treatment.…”

Section: Discussionmentioning

confidence: 99%

“…In an attempt to improve root canal disinfection, the calcium hydroxide (CH) dressing is used before the canal obturation (3). However, it has been demonstrated that the CH dressing is very difficult to remove, especially in the apical third of the root canal (4). None of the currently available methods efficiently removes the CH dressing completely from the canal walls (5).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of the Calcium Hydroxide Intracanal Dressing on Dentinal Tubule Penetration of Two Root Canal Sealers

Cruz¹,

Grecca²,

Piasecki³

et al. 2017

Eur Endod J

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Objective: The aim of this study was to evaluate the effect of a calcium hydroxide (CH) dressing on the tubular penetration of two endodontic sealers, AH Plus (Dentsply Maillefer, Ballaigues, Switzerland) and MTA Fillapex (Angelus, Londrina, Brazil). Methods: Seventy-two mandibular premolars with a single root canal were prepared with ProFile.04 rotary instruments (Dentsply Maillefer) and divided into four groups. In two groups, an intracanal CH dressing was placed for 15 days. The obturations were performed with lateral condensation of gutta-percha in combination with one of the tested sealers. The roots were transversely sectioned at the apical and middle levels. The percentage of sealer penetration in the root canal walls and the percentage of impregnated dentin area in the transverse sections were obtained using confocal laser scanning microscopy. Statistical analysis was performed using one-way analysis of variance (ANOVA) and Games-Howell test. Results: The CH dressing reduced the mean value of tubular penetration in the middle third of teeth obturated with AH Plus (P<0.01), whereas no difference was observed at the apical sections for both sealers. Conclusion:The CH dressing did not interfere with the apical penetration of both tested sealers, however, decreased the tubular penetration in the middle third of the AH Plus root canal fillings. Overall, MTA Fillapex presented higher tubular penetration than AH Plus obturations. Keywords: Calcium hydroxide, confocal laser scanning microscopy, epoxy resin-based root canal sealer, mineral trioxide aggregate-based sealer

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Section: Discussionmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of the Calcium Hydroxide Intracanal Dressing on Dentinal Tubule Penetration of Two Root Canal Sealers

Cruz¹,

Grecca²,

Piasecki³

et al. 2017

Eur Endod J

View full text Add to dashboard Cite

show abstract

“…CH placed inside a root canal must be completely removed before the latter can be filled with a permanent filling material. This is because CH residues on root canal walls reduce dentinal bond strength and compromise endodontic sealing by interfering with the penetration and adhesion of root canal sealers into dentinal tubules [4][5][6] . Several studies [7][8][9][10][11] have examined CH removal methods, and the most frequently described method is root canal instrumentation using a master apical file in combination with copious irrigation 7) .…”

Section: Introductionmentioning

confidence: 99%

Efficacy of self-adjusting file and passive ultrasonic irrigation on removing calcium hydroxide from root canals

et al. 2013

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The aim of this study was to evaluate the efficiencies of the self-adjusting file (SAF) system, passive ultrasonic irrigation (PUI), and conventional irrigation (CI) in removing calcium hydroxide (CH) from root canals. Fifty-one mandibular premolars were used. After root canals were instrumented and filled with a CH paste, 45 teeth were randomly assigned to three experimental groups according to CH removal technique: SAF system, PUI, or CI. The remaining 6 teeth served as positive and negative controls. All samples were evaluated by scanning electron microscopy (SEM) and scored. None of the techniques removed CH completely. However, results at coronal, middle and apical thirds showed that PUI technique was significantly more effective than SAF and CI in removing CH dressing residues from root canal walls.

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“…6 Calcium hydroxide residues on the canal walls interfere negatively in endodontic treatment prognosis, 7 influence dentine bond strength, 8 affect the adhesion of the endodontic filling material to the root canal walls 9 and the penetration of sealers into dentinal tubules, 10 and react chemically with the sealer, interfering with its physical properties. 11,12 Several techniques have been proposed to remove the calcium hydroxide dressing from the root canal system, including the use of endodontic hand files, 13 sonic activation, 14 passive ultrasonic irrigation, 6,15 the CanalBrush System 6 and nickel-titanium rotary instruments. 16,17 Removal of the dressing using hand files, with or without an irrigating solution, may be inefficient and tedious, 6 whereas the use of NiTi rotary instruments may enhance the removal procedure when compared to the techniques Declaration of Interests: The authors certify that they have no commercial or associative interest that represents a conflict of interest in connection with the manuscript.…”

Section: Introductionmentioning

confidence: 99%

Efficacy of NiTi rotary instruments in removing calcium hydroxide dressing residues from root canal walls

et al. 2012

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The aim of this study was to evaluate the efficacy of three rotary instrument systems (K3, ProTaper and Twisted File) in removing calcium hydroxide residues from root canal walls. Thirty-four human mandibular incisors were instrumented with the ProTaper System up to the F2 instrument, irrigated with 2.5% NaOCl followed by 17% EDTA, and filled with a calcium hydroxide intracanal dressing. After 7 days, the calcium hydroxide dressing was removed using the following rotary instruments: G1 -NiTi size 25, 0.06 taper, of the K3 System; G2 -NiTi F2, of the ProTaper System; or G3 -NiTi size 25, 0.06 taper, of the Twisted File System. The teeth were longitudinally grooved on the buccal and lingual root surfaces, split along their long axis, and their apical and cervical canal thirds were evaluated by SEM (×1000). The images were scored and the data were statistically analyzed using the Kruskall Wallis test. None of the instruments removed the calcium hydroxide dressing completely, either in the apical or cervical thirds, and no significant differences were observed among the rotary instruments tested (p > 0.05).

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Effects of calcium hydroxide on physical and sealing properties of canal sealers

Abstract: Contact with Ca(OH)2 agents left on the canal wall caused considerable changes to the sealing ability of sealers.

Cited by 79 publications

References 15 publications

Influence of the Calcium Hydroxide Intracanal Dressing on Dentinal Tubule Penetration of Two Root Canal Sealers

Influence of the Calcium Hydroxide Intracanal Dressing on Dentinal Tubule Penetration of Two Root Canal Sealers

Efficacy of self-adjusting file and passive ultrasonic irrigation on removing calcium hydroxide from root canals

Efficacy of NiTi rotary instruments in removing calcium hydroxide dressing residues from root canal walls

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