Long-term Evaluation of the Influence of Smear Layer on the Apical Sealing Ability of MTA

Yildirim, Tahsin; Oruçoğlu, Hasan; Çobankara, Funda Kont

doi:10.1016/j.joen.2008.08.022

Cited by 50 publications

(41 citation statements)

References 32 publications

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“…The composition of the iRoot SP and MTA Fillapex sealers is similar to that of MTA (6). Some previous studies found that removal of the smear layer increased microleakage in root-end cavities and root canals filled with MTA (19,20). However, in the present study, smear layer removal had no adverse effects on the sealing properties of iRoot SP or MTA Fillapex.…”

Section: Discussionsupporting

confidence: 54%

“…However, bond strength between some sealers and dentin was reported to be better when the smear layer was left intact (18). In addition, previous studies (19,20) found that removal of the smear layer can compromise the sealing properties of MTA. To our knowledge, there is no information on the effect of smear layer removal on the apical microleakage of silicate-based endodontic sealers.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the smear layer on apical seals produced by two calcium silicate-based endodontic sealers

et al. 2014

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We compared the apical seals of two new calcium silicate-based sealers (iRoot SP and MTA Fillapex) in the presence and absence of a smear layer. Eighty-two human premolars were prepared and randomly divided into four groups. In groups 1 and 3, the smear layer was retained. In groups 2 and 4, the root canals were irrigated with EDTA to remove the smear layer. Canals were filled using gutta-percha/iRoot SP (in groups 1 and 2) or obturated with gutta-percha/MTA Fillapex (in groups 3 and 4). Fluid filtration was used to evaluate apical microleakage. The presence of the smear layer had no significant effect on the sealing properties of the filling materials, except for iRoot SP at 2 weeks (P = 0.007). There was significantly less microleakage with iRoot SP than with MTA Fillapex (P = 0.025 at 2 weeks; P < 0.001 at 3 months). Leakage decreased significantly over time in all specimens, except in group 2 (P = 0.473). In conclusion, removal of the smear layer had no adverse effect on the sealing properties of calcium silicate-based sealers. In addition, the sealing ability of iRoot SP was superior to that of MTA Fillapex. (J Oral Sci 56, 215-219, 2014)

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Section: Discussionsupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Effect of the smear layer on apical seals produced by two calcium silicate-based endodontic sealers

et al. 2014

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“…Leakage was not affected by the material used to seal the perforation, but the use of chelating solutions (EDTA and MTA) in association with NaOCl affected sealing [ 187 ]. Corroborating these fi ndings, an apical microleakage study with teeth obturated with MTA showed that the apical microleakage is less when the smear layer is present than when it is absent [ 195 ]. The cavity thickness had no infl uence in bacterial leakage of the MTA retrofi llings.…”

Section: Sealing Abilitymentioning

confidence: 89%

Properties of Hydrated Mineral Trioxide Aggregate

Tanomaru-Filho

Guerreiro-Tanomaru

2014

Mineral Trioxide Aggregate in Dentistry

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MTA has been currently commercialized in two different forms, the gray (GMTA) and the white version (WMTA). In particular, the white MTA was developed due to the potential discoloration promoted by the gray version of the cement. The chemical composition of the MTAs is very similar to that of Portland cement despite the addition of components containing bismuth in the MTA's cements [ 91 , 128 ], which aims to confer radiopacity to the materials [ 34 ]. The mixture of the MTA powder with distilled water results in the formation of by-products, such as calcium hydroxide and calcium silicate hydrate gel [ 27 , 28 ] as discussed in Chap. 2 . The particular mechanism of hydration and the structure of the set material result in particular properties displayed by the set MTA.The initial pH of the MTA is approximately 10.2, but it increases to 12.5 after 3 h immersed in solution [ 177 ]. MTA has the ability to sustain high values of pH during long periods [ 75 ]. The high pH values exhibited by MTA are attributed to the constant release of calcium and the formation of calcium hydroxide.Several studies had reported release of calcium from MTA [ 12 , 74 , 131 ]. The calcium ion release is enhanced when calcium chloride is added as an accelerator to MTA [ 12 ]. Moreover, when MTA was placed into the root canals of teeth with simulated radicular resorption, a greater calcium ion release was detected in comparison to teeth not fi lled with MTA [ 131 ]. Setting TimeThe hydration of the MTA powder produces a colloidal gel, which solidifi es and results in a solid structure. MTA is prepared by mixing the powder with distilled water using a ratio of 3:1 (powder/distilled water) [ 184 ].

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“…Marginal leakage studies have been conducted with human saliva (Al-Hezaimi et al, 2005), fluid filtration (Yildirim et al, 2008), and dye solutions such as India ink (Jenkins et al, 2006) and blue methylene (Aqrabawi, 2000). However, the use of dyes has been questioned to evaluate the marginal leakage, because the sealing capacity of the material may be influenced by the dye solution, producing results that are not reproducible and that have high standard deviations (Editorial Board of the Journal of Endodontics, 2007;Tanomaru-Filho et al, 2005;Wu et al, 1998).…”

Section: Discussionmentioning

confidence: 99%

“…The physicochemical properties include great sealing ability. To test the sealing ability of root-end filling materials, studies have used bacterial infiltration (Maltezos et al, 2006;Montellano et al, 2006), penetration of human saliva (Al-Hezaimi et al, 2005), dye leakage (Jenkins et al, 2006), microleakage of bovine serum albumin (Saghiri et al, 2008), and fluid infiltration (Yildirim et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Back‐scattered electron imaging for leakage analysis of four retrofilling materials

Chittoni

Martini

Wagner

et al. 2011

Microscopy Res & Technique

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This study aimed to evaluate, ex vivo, the nanoleakage in dentinal tubules, the linear infiltration of silver nitrate in the dentin wall/root-end filling material interface, and the presence of gaps in this interface in root-end cavities filled with 4 filling materials. Forty-eight disto-buccal root canals of maxillary molars were instrumented and filled. Retrograde cavities were prepared with ultrasonic points (apical 2 mm). The samples were divided into 2 control groups (n = 4) and 4 experimental groups (n = 10): Group I--white mineral trioxide aggregate (MTA); Group II--Super EBA; Group III--Portland cement; and Group IV--Sealer 26. After 1 week, the specimens were subjected to silver nitrate and prepared for SEM (backscattered electrons). In the apical-apical segment, an area with significantly higher leakage was observed for Super EBA, followed by Portland cement, MTA, and Sealer 26 (P = 0.0054). In the medium and cervical segments, all materials showed the same leakage behavior (P = 0.1815 and P = 0.1723, respectively). The linear infiltration at the dentin wall/root-end filling material interface was higher with Super EBA than the other groups. No differences in the percentage of gaps along the 3 mm of dentin wall/root-end filling material interface between the 4 materials were evident (P > 0.05). Nanoleakage occurred mainly in the apical segment of the samples, and Super EBA showed the highest values. The area and linear leakage were lower in the middle and coronal segments, regardless of the root-end filling material. No material perfectly sealed the root-end cavities, which allowed for the leakage occurrence.

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Long-term Evaluation of the Influence of Smear Layer on the Apical Sealing Ability of MTA

Cited by 50 publications

References 32 publications

Effect of the smear layer on apical seals produced by two calcium silicate-based endodontic sealers

Effect of the smear layer on apical seals produced by two calcium silicate-based endodontic sealers

Properties of Hydrated Mineral Trioxide Aggregate

Back‐scattered electron imaging for leakage analysis of four retrofilling materials

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