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 Table of Contents  
ORIGINAL ARTICLE
Year : 2018  |  Volume : 30  |  Issue : 2  |  Page : 113-118

Evaluation of apical sealing ability of ActiV GP/glass ionomer sealer as a root filling material


1 Department of Endodontics, Faculty of Dentistry, University of Damascus, Damascus, Syria
2 Department of Restorative Dental Sciences, Al-Farabi College for Dentistry and Nursing, Riyadh, Saudi Arabia

Date of Web Publication5-Dec-2018

Correspondence Address:
Dr. Adnan Asaad Habib
Department of Restorative Dental Sciences, Al-Farabi Colleges, Riyadh 11691
Saudi Arabia
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/endo.endo_108_17

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  Abstract 

Introduction: The aim of this in vitro study was to assess the sealing ability of ActiV GP/glass ionomer sealer and to compare it with sealing ability of Resilon/Real Seal and gutta-percha/AH Plus.
Materials and Methods: Forty-five human mandibular premolars were randomly divided into three groups (15 canals each). Each canal was instrumented to a size 40, taper 6% using K3 NiTi rotary instruments. A smear layer was removed, and the teeth were filled using single cone technique with ActiV GP, Resilon/Real Seal, or lateral condensation with gutta-percha/AH Plus. The teeth then were immersed in 2% methylene blue solution for 24 h, longitudinally sectioned and examined under a stereomicroscope to evaluate the liner leakage of the dye in each group. The data were analyzed with descriptive statistical methods and Mann–Whitney test (P = 0.05).
Results: The lowest mean of leakage was recorded in gutta-percha/AH Plus group. There was a statistically significant difference between gutta-percha/AH Plus group and the two other groups; ActiV GP group and Resilon group.
Conclusion: Dye penetration examination showed that ActiV GP/GI sealer had weak sealing properties, Resilon/RealSeal system did not show superior sealing properties in comparison with gutta-percha/AH Plus sealer, and lateral condensation shows better sealing properties in comparison with single cone technique.

Keywords: ActiV/GP, AH Plus, leakage, obturation, Resilon


How to cite this article:
Kassar SA, Habib AA, Doumani MD, Abdulrab S, Alafif H. Evaluation of apical sealing ability of ActiV GP/glass ionomer sealer as a root filling material. Endodontology 2018;30:113-8

How to cite this URL:
Kassar SA, Habib AA, Doumani MD, Abdulrab S, Alafif H. Evaluation of apical sealing ability of ActiV GP/glass ionomer sealer as a root filling material. Endodontology [serial online] 2018 [cited 2018 Dec 14];30:113-8. Available from: http://www.endodontologyonweb.org/text.asp?2018/30/2/113/246928




  Introduction Top


The principal objectives of endodontic therapy are to clean and shape the root canal system and to fill the canal system completely in three dimensions. This aimed to prevent penetration of bacteria and their products into the periapical tissues and develop a hermetic seal.[1] Inadequate obturation of root canal system results in failure of endodontic therapy.[2] It has been shown that about 60% of endodontic failures are due to incomplete obturation of the canal space.[3]

Various endodontic materials have been used for obturation of the root canal. Most techniques employ a core material and sealer. Gutta-percha has been used and considered for many decades the material of choice because its characteristics as biocompatible, inert, dimensionally stabile, and plastic.[4],[5]

In recent years, there has been an increasing concern about the poor sealing properties of the conventional root-filling materials, gutta-percha, and the different sealers. One of the recent trends in endodontics has been the development of obturating materials that are capable of bonding to canal wall dentin to eliminate interfacial gaps coronally and apically.[6],[7] Dentin adhesive technology has been adapted from restorative dentistry and applied to obturating materials through hybrid layer formation.[8] Likewise, glass ionomer cements (GICs) which chemically bond to dentin through ion exchange and formation of an intermediate layer along the dentin-material interface have been adopted to produce GI-based root canal sealers.[9]

With the beginning of the 21st century, the artificer of root canal obturation materials fabricated, through adhesive mechanisms, a continuum of bonded interfaces from dentin to sealer to the core obturation material, and from the coronal to apical third of the canal realm, including all the irregularities of canal as fins, cul-de-sacs, and isthmuses. This hypothetical concept results in creating a monoblock in the root canal[10] which, if successful, should completely eliminate interfacial gaps, produce perfect coronal and apical seal, and prevent reinfection of canal space after the treatment.[11]

The resin-based obturation systems RealSeal and Resilon have been introduced as alternatives to conventional obturation materials, gutta-percha, and the different types of sealer.[12] It has been claimed that Resilon was the first obturation system has the ability to form a “monoblock” between obturation material and the canal walls.[13] Resilon is a polycaprolactone polymer which contains radiopaque fillers and bioactive glass. The resin sealer adheres to a Resilon core on one side and attaches to the etched root dentine surface on the other side.[12]

ActiV GP obturation system is a new GI-based obturation system. The manufacturer claims the product to be better than previous products in terms of working time, radiopacity, and handling properties.[14] ActiV GP consists of gutta-percha cones impregnated on the external surface with GI. These cones are available in 0.04 and 0.06 taper cones; the sizes of cones are precisely defined by laser to affirm a more accurate fit. These cones are used as single cone with a GI sealer to give a bond between the dentinal wall of the canal and the master cone.[12]

The aim of this in vitro study was to assess the sealing ability of ActiV GP/GI sealer and to compare it with sealing ability of Resilon/RealSeal and gutta-percha/AH Plus as a control group.


  Materials and Methods Top


Forty-five single-rooted freshly extracted human mandibular premolars were selected in this in vitro study. The teeth were matched anatomically based on visual examination of buccolingual and mesiodistal radiographs. Each tooth selected in this study exhibited one canal with not dilacerated completely formed root, and free from resorption, caries, cracks, and restorations. The teeth were randomly divided into three equal groups (n = 15) based on the material used in obturating the root canals. Any adherent soft tissues, bone fragments, or calculus were removed through scaling and polishing. The dental crowns were sectioned at the cementoenamel junction with a high-speed diamond bur (Komet, Gebr. Brasseler GmbH and Co. KG Germany) under continuous water spray to obtain access to the root canal. The working length of each canal was visually established by placing a size 10 K file (Mani Inc., Tochigi-Ken, Japan) until the tip of the file was visible at the tip of the apical foramen. The working length was established 1 mm short of the apex. The canal systems were instrumented to the working length till a size 40 taper 06 by using a crown-down technique with K3 NiTi rotary files (Sybron Endo, orange, California, USA). One milliliter of sodium hydrochloride (5.25%) was used for irrigation after use of each instrument followed by 3 ml of 17% ethylenediaminetetraacetic acid (MDCleanser, META Biomed, Korea) for 1 min to remove the smear layer. The final rinse was done with 5 ml of distilled water. Root canals were then dried using sterile paper points (Diadent Group International, Korea). All prepared root canals were obturated as follows:

  • Group 1: The canals were sealed and obturated with ActiV GP obturation system (Brasseler USA, Savannah, GA). A single-cone technique was used for the ActiV GP group. The master cone (40/06) was coated with ActiV GP sealer and introduced slowly into the root canal until the working length was reached. After setting, the master cone was seared off 2 mm beneath the canal orifice
  • Group 2: The canals were sealed and obturated with Resilon/RealSeal (Resilon Research LLC, Madison, CT, USA). In the Resilon group, obturation was done following manufacturer technique protocol. The self-etching primer (RealSeal Primer) was introduced into the canals with sterile paper points to coat the root canal walls, and excess primer was removed with sterile paper points. The canals were filled using single-cone technique. The master cone (40/06) was coated with RealSeal sealer and introduced slowly into the root canal until the working length was reached. Once the obturation was completed, the coronal surface was light cured for 40 s. After setting, the master cone was seared off 2 mm beneath the canal orifice
  • Group 3: The canals were sealed using lateral condensation technique with gutta-percha points and AH Plus as sealer. A standardized size 40 GP master point (ALPHA-DENT, North Hamlin Avenue, Lincolnwood, USA) was selected and introduced into the root canal to full working length and was checked for tugback criteria. AH Plus sealer (Dentsply De Trey GmbH, Konstanz, Germany) was mixed according to the manufacturer's directions and applied to the canal wall using K-file size #25 in a counterclockwise rotation. The master point was then coated with a sealer and introduced slowly into the root canal until the working length was reached. Lateral condensation was performed using standardized finger spreaders (Mani Inc., Tochigi-Ken, Japan) and GP point sizes of # 15, #20, #25, and # 30. Once the obturation was completed, the gutta-perch cones were seared off 2 mm beneath the canal orifice.


After filling the root canals, the access cavities were sealed with glass ionomer cement (GC Corporation, Tokyo, Japan) and stored at 37°C and 100% humidity for 7 days. Then, 2 layers of nail varnish were applied on all the root surfaces except for 2 mm of the root end and immersed in 2% methylene blue for 24 h at 37°C. Each root was split and sectioned longitudinally in a buccolingual direction with a diamond disk (0.3 mm in thickness) using a low-speed handpiece with water coolant, and the maximum extent of dye leakage was measured using a stereomicroscope at ×20 magnification [Figure 1], [Figure 2], [Figure 3]. To evaluate the apical leakage in this in vitro study, Escobar's[15] criteria were used to evaluate the infiltration proportions:
Figure 1: Medium infiltration in a sample from ActiV GP/GI sealer group

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Figure 2: Medium infiltration in a sample from Resilon/RealSeal group

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Figure 3: Infiltration loss in a sample from gutta-percha cones/AH Plus group

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0. Infiltration loss (dye penetration 0–<1.5 mm)

1. Simple infiltration (dye penetration 1.5–3 mm)

2. Medium infiltration (dye penetration > 3 mm).

This work has been conducted in full accordance with the World Medical Association Declaration of Helsinki, with an approval from the ethics committee in the university.

The data were analyzed with descriptive statistical methods using Kruskal–Wallis and Mann–Whitney tests (P = 0.05) using SPSS software (SPSS version 13.0, SPSS, Chicago, IL, USA). The level of significance was set at 0.05.


  Results Top


All groups in this study demonstrated dye leakage. The lowest mean of leakage was recorded in Group 3 (Gutta-percha/AH Plus = 0.37 mm) and the highest mean recorded in Group 1 (ActiV GP = 4.82 mm). Microleakage was significantly greater in Activ GP group(G1) than Resilon group (G2) and GP/AH Plus group (G3) (P < 0.05). The mean of leakage in Resilon group (G2) was 2.67 mm, and there was statistically significant difference between this group and the GP/AH Plus group (G3) (P < 0.05).

The scores for apical dye penetration evaluation by Escobar et al.'s criteria are shown in [Table 1].
Table 1: Scores for apical dye penetration evaluation by Escobar et al.'s criteria

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The extent of dye penetration in millimeters, the means, and the standard deviations for each group are listed in [Table 2].
Table 2: Extent of apical dye penetration (mm)

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  Discussion Top


Recently, several obturation materials have been introduced into the endodontic field. Some of these are modifications of materials developed for restorative dentistry. Others may be considered as new once, with new concepts that have not been used before in endodontics.[16]

It is recognized that gutta-percha does not provide the idealistic bonding to root canal dentin, so several studies are conducted to find alternative materials for creating a apical seal that is tight and sustaining the root structure mechanically.[17],[18] GIC-based sealers can adhere strongly to dentinal walls, but they cannot bind to gutta-percha points, so a gap exists between the sealer and gutta-percha after complete setting through which fluids and bacteria can pass.[13] ActiV GP is a root canal obturation system comprises gutta-percha cones coated with GI that can bond to radicular dentine surface and GI sealer.[19] Sealing ability of ActiV GP/GI system has been evaluated in many studies; in this study, the highest mean of dye leakage was recorded in ActiV GP = 4.82 mm group, and there was statistically significant difference between the ActiV GP group and another groups (the Resilon group and the GP/AH Plus group).

On the other hand, the finding of our study contradicted with that of Fransen et al.[14] and Monticelli et al.;[20] these both studies found that there was no difference in leakage between teeth obturated with ActiV GP/GI sealer and GP/AH Plus. Grag in his study found significantly lesser leakage in the ActiV GP system group when compared with gutta-percha/AH Plus group and Resilon/Epiphany group after the interval of 7 day. However, there was no statistically significant difference in the leakage among all the three tested materials: gutta-percha/AH Plus, ActiV GP system, and Resilon/Epiphany at the end of the 4th week.[21]

A highly significant difference was shown between GP/AH Plus group and ActiV GP group. This result may be attributed to shrinkage on setting of ActiV GP/GI sealer, and the nonhomogeneous mix of GI sealer which is questionable and might have an adversarial effect on its properties.

The ActiV GP/GI sealer system uses a single-cone technique in which a master cone is closely resemble the geometry of NiTi rotary instruments, thus, there may be a thick layer of sealer at interfacial area between dentine surface and filling material.[14] It has been demonstrated that a thicker layer of sealer negatively influences sealing ability;[22] larger thick layer of sealer can result in voids due to shrinkage upon setting reaction.[23]

A resin-based root canal filling material was introduced to overcome the limitations of gutta-percha and other sealers. It is claimed that Resilon/RealSeal system or Resilon/Epiphany system can enhance the sealing ability by forming a monoblock. Since its introduction in 2004, numerous reports have been published regarding various aspects of this material. In this study, sealing ability of Resilon/RealSeal system was evaluated; the mean of leakage in Resilon group was 2.67 mm, it was lesser than that of ActiV GP group (4.82 mm) and higher than that of GP/AH Plus group (0.37); statistically, there was significant difference between Resilon group and other groups, so the results of the present study were not in agreement with the results of previous studies.[14],[20],[21] However, other investigations have indicated that some obturation systems such as Guttaflow and Resilon cones with Epiphany provide better seal against microbial leakage than gutta-percha/AH-plus sealer.[24],[25]

In restorative dentistry, adhesive systems have shown reliable results as long-term execution and less technique sensitivity. In endodontics, the argument about the fulfillment of adhesive systems inside the root canal remains because of the limitations of bonding to radicular dentine.[26] It has been shown that several factors negatively affect the adhesion of resin-based obturation materials. The anatomy of the root canal is more irregular with lateral canals and a decreasing number of dentinal tubules in the apical area. furthermore, the apical canal wall is partially covered with calcified appositions.[7] The root canal system has an unfavorable geometry for resin bonding since configuration factor or C-Facto might be 100:1; virtually, every dentin wall has an opposing wall and there are minimal unbonded surfaces. Another limitation of dentin bonding is deterioration of the resin bond with time due to functional forces or incompleteness of resin infiltration into the demineralized dentin which leads to fluid movement between the hybrid layer and unaffected dentin. In addition to drawbacks during polymerization reaction of resin due to resin cure type (dual-cured or self-cured) or irrigating solutions and medicaments used during root canal therapy which interfere with the polymerization reaction of resin such as sodium hypochlorite, hydrogen peroxide, and eugenol. Concerns have been expressed that residual calcium hydroxide paste could prevent effective bonding in some areas that it can act as a physical barrier and that the high pH may act to neutralize the acid primer in self-etching adhesives.[7]

Epoxy-resin based sealers are used for many decades for their adhesive ability; AH26 is an epoxy resin-based material with good sealing ability, The long setting time and flowability of this material inhibits formation of cracks and fast detachment from the dentinal wall. It is a compatible material and can harden in the presence of moisture; AH26 has <0.5% constriction when entering the accessory canals.[27] AH Plus is claimed to have the advantages of AH26, but it appears to be more radiopaque and have less microleakage compared to AH26. Moreover, AH Plus does not release formaldehyde and has a shorter setting time.[28]


  Conclusion Top


Within the limitations of this study, we can conclude that

  • Dye penetration examination showed that ActiV GP/GP Sealer had weak sealing properties to root canal walls in comparison with GP/AH Plus and Resilon™/Real Seal
  • Resilon™/Real Seal obturation system which is introduced as an alternative root filling to gutta-percha did not show superior sealing properties in comparison with gutta-percha cones/AH Plus sealer
  • Lateral condensation obturation technique show better sealing properties in comparison with single cone technique
  • Till this day, no root canal filling material can accomplish all the requirements for a perfect root canal sealing.


Acknowledgment

The authors acknowledge the staff of faculty of dentistry, University of Damascus, Damascus, Syria and the staff of Al-Farabi College for Dentistry and Nursing, Riyadh, Saudi Arabia.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
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    Figures

  [Figure 1], [Figure 2], [Figure 3]
 
 
    Tables

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