EFFECTS OF COLD LATERAL VERSUS WARM VERTICAL COMPACTION OBTURATION ON THE PUSH-OUT BOND STRENGTH OF BIOROOT™, A CALCIUM SILICATE-BASED SEALER

Objective: BioRoot™ , which contains pure calcium silicate, is used in cold lateral compaction. However, hydroxyl ions are still released when BioRoot™is used in warm vertical compaction. This study compared the effects of cold and warm vertical compaction obturation on the push-out bond strengthof BioRoot™.Methods: Specimens from 16 root canals instrumented with ProTaper Next X5 50/06 were divided into two groups (n=16 specimens per group).Group 1 was obturated using cold lateral compaction, whereas Group 2 was obturated using warm vertical compaction. All samples were incubatedfor 48 h (37°C, 100% humidity) and embedded into an acrylic block. Starting at 7 mm from the apex, two 2-mm-thick slices of each sample were cut.Dislodgement resistance was measured using a universal testing machine, and the push-out bond strength was calculated.Results: There was a significant difference in the push-out bond strength value between cold (4.5–41.1 MPa) and warm (4.12–24.25 MPa) compactionobturation (p<0.05).Conclusion: Cold lateral compaction provides better adhesion capability than warm vertical compaction in root canal obturation.

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Push-Out Bond Strength and SEM Evaluation in Roots Filled with Two Different Techniques Using New and Conventional Sealers

Materials ◽

10.3390/ma11091620 ◽

2018 ◽

Vol 11 (9) ◽

pp. 1620 ◽

Cited By ~ 3

Author(s):

Pervin Dabaj ◽

Atakan Kalender ◽

Ayce Unverdi Eldeniz

Keyword(s):

Bond Strength ◽

Delivery System ◽

Calcium Silicate ◽

Root Canals ◽

Group 4 ◽

Significant Difference ◽

Ah Plus ◽

Bond Strengths ◽

Push Out ◽

Group 1

The aim of this study was to evaluate the influence of calcium-silicate-based sealer (Endosequence-BC-Sealer) in roots, filled with thermo-plasticized injectable technique aided by Calamus-Flow-Delivery-System, on bond strength to radicular dentin, in comparison with conventional epoxy-resin-based sealer (AH-Plus) along with cold-lateral-compaction technique. Root canals of mandibular-premolar teeth (n = 80) were instrumented using Protaper Universal rotary files and were randomly divided into four experimental groups (n = 20) as follows: (1) AH-Plus + cold-lateral-compaction technique; (2) Endosequence-BC-Sealer + cold-lateral-compaction technique; (3) AH-Plus + thermo-plasticized injectable technique; and (4) Endosequence-BC-Sealer + thermo-plasticized injectable technique. Horizontal disc shaped samples from each group (n = 60/group) were obtained and push-out bond strength testing was performed at a cross-head speed of 0.5 mm/min. Data were analyzed statistically using nonparametric Kruskal-Wallis analysis and Mann-Whitney test (p < 0.001). The statistical analysis revealed a significant difference amongst the groups (p < 0.001). The highest bond strength values were found in group 1 compared with all the other experimental groups (p < 0.001), whereas the lowest bond strength values were found in group 4 (p < 0.001). It was concluded that thermo-plasticized injectable technique with Calamus-Flow-Delivery-System lowered the bond strengths of the sealers, especially Endosequence-BC-Sealer. Therefore, this technique is not recommended to calcium-silicate-based sealers. Further studies are needed to confirm the findings of this study.

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Effect of cement type and thickness on push-out bond strength of fiber posts

Journal of Dental Research Dental Clinics Dental Prospects ◽

10.15171/joddd.2018.043 ◽

2018 ◽

Vol 12 (4) ◽

pp. 277-282

Author(s):

Farzaneh Farid ◽

Khadijeh Rostami ◽

Sareh Habibzadeh ◽

MohammadJavad Kharazifard

Keyword(s):

Bond Strength ◽

Testing Machine ◽

Test Results ◽

Resin Cements ◽

Fiber Posts ◽

Significant Difference ◽

Root Dentin ◽

Group 2 ◽

Self Etch ◽

Push Out

Background. This study investigated the effect of the thickness of two resin cements on push-out bond strength of fiber posts to root dentin. Methods. Sixty decoronated single-rooted teeth were endodontically treated. The specimens were then randomly allocated to two groups (n=30); group 1: drill size 90 w, matching the size of fiber posts used; group 2: drill size 110, larger than the posts. The specimens in each group were divided into 2 subgroups (n=15); subgroup SE, in which the posts were cemented with self-etch Panavia F2.0 and subgroup SA, in which self-adhesive Panavia cement was used. After 72 hours, 2 slices with 1 mm of thickness were prepared from the mid-root of each specimen. Push-out bond strength test was performed in a universal testing machine at a crosshead speed of 1 mm/min. Data were analyzed with two-way ANOVA and t-test. Results. The mean bond strengths of the posts cemented in matched-size spaces for SE and SA groups were 4.02±1.6 and 4.12±2.3 MPa, respectively. For posts cemented in oversized spaces, the values were 4.9±2.3 and 2.8±1.3 MPa, respectively. In matched-size spaces, there was no significant difference between the two groups. Conclusion. The results of this study suggested that increasing the cement thickness would reduce the bond strength of fiber posts to root dentin when self-adhesive cements are used; however, self-etch adhesives were not affected.

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Bond Strength of Amorphous Calcium Phosphate–Containing Orthodontic Composite Used as a Lingual Retainer Adhesive

The Angle Orthodontist ◽

10.2319/112807-560.1 ◽

2009 ◽

Vol 79 (1) ◽

pp. 117-121 ◽

Cited By ~ 12

Author(s):

Tancan Uysal ◽

Mustafa Ulker ◽

Gulsen Akdogan ◽

Sabri Ilhan Ramoglu ◽

Esra Yilmaz

Keyword(s):

Calcium Phosphate ◽

Bond Strength ◽

Amorphous Calcium Phosphate ◽

Testing Machine ◽

Internal Diameter ◽

Compression Load ◽

Significant Difference ◽

Group 2 ◽

Lingual Retainer ◽

Group 1

Abstract Objective: To evaluate the shear bond strength and fracture mode difference between amorphous calcium phosphate (ACP)–containing adhesive and conventional resin-based composite material used as an orthodontic lingual retainer adhesive. Materials and Methods: Forty crowns of extracted lower human incisors were mounted in acrylic resin, leaving the buccal surface of the crowns parallel to the base of the molds. The teeth were randomly divided into two groups: experimental and control, containing 20 teeth each. Conventional lingual retainer composite (Transbond-LR, 3M-Unitek) and ACP-containing orthodontic adhesive (Aegis-Ortho) were applied to the teeth surface by packing the material into the cylindrical plastic matrices with a 2.34-mm internal diameter and a 3-mm height (Ultradent) to simulate the lingual retainer bonding. For shear bond testing, the specimens were mounted in a universal testing machine, and an apparatus (Ultradent) attached to a compression load cell was applied to each specimen until failure occurred. The shear bond data were analyzed using Student's t-test. Fracture modes were analyzed by χ2 test. Results: The statistical test showed that the bond strengths of group 1 (control Transbond-LR, mean: 24.77 ± 9.25 MPa) and group 2 (ACP-containing adhesive, mean: 8.49 ± 2.53 MPa) were significantly different from each other. In general, a greater percentage of the fractures were adhesive at the tooth-composite interface (60% in group 1 and 55% in group 2), and no statistically significant difference was found between groups. Conclusion: The ACP-containing Aegis-Ortho adhesive resulted in a significant decrease in bond strength to the etched enamel surface.

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Push-out bond strength of different mineral trioxide aggregates

European Journal of Dentistry ◽

10.4103/1305-7456.137646 ◽

2014 ◽

Vol 08 (03) ◽

pp. 348-352 ◽

Cited By ~ 4

Author(s):

Huseyin Ertas ◽

Ebru Kucukyilmaz ◽

Evren Ok ◽

Banu Uysal

Keyword(s):

Bond Strength ◽

Testing Machine ◽

Mineral Trioxide Aggregate ◽

Human Teeth ◽

Universal Testing ◽

Significant Difference ◽

Bond Strengths ◽

The Mean ◽

Post Hoc ◽

Push Out

ABSTRACT Objective: This study was aimed to evaluate and to compare the push-out bond strength of different brands of mineral trioxide aggregate (MTA) with a calcium enriched mixture cement (CEM). Materials and Methods: Fifteen extracted, single-rooted human teeth were used. The middle-third of the roots were sliced perpendicular to the long axis into 1.00 ± 0.05 mm thick serial slices (15 root × 4 slice = 60 specimen). The specimens were then divided into three groups (n = 20). The standardized root discs were filled with white CEM, ProRoot MTA, MTA-Angelus and wrapped in a serum-soaked gauze. After 3 days at relative humidity, the push-out bond strengths were measured with a universal testing machine. Data were analyzed using one-way analysis of variance and post hoc Tukey tests. Results: The mean push-out bond strength value of the ProRoot MTA group (12.7 ± 2.5 MPa) was the highest and statistically significant difference was recorded between ProRoot MTA and other groups (P < 0.001). There was no significant difference between the mean bond strength of CEM cement (4.6 ± 1.1 MPa) and MTA-Angelus (4.5 ± 1.5 MPa) (P = 0.982). Conclusion: The push-out bond strength of MTA was changed with the brands and ProRoot MTA had the highest push-out bond strength.

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Effect of Enamel Etching on Tensile Bond Strength of Brackets Bonded In Vivo with a Resin-reinforced Glass Ionomer Cement

The Angle Orthodontist ◽

10.2319/111705-402r.1 ◽

2007 ◽

Vol 77 (1) ◽

pp. 113-116 ◽

Cited By ~ 10

Author(s):

Gabriella Rosenbach ◽

Julio Pedrae Cal-Neto ◽

Silvio Rosan Oliveira ◽

Orlando Chevitarese ◽

Marco Antonio Almeida

Keyword(s):

Bond Strength ◽

Testing Machine ◽

Glass Ionomer Cement ◽

Tensile Bond Strength ◽

Glass Ionomer ◽

Significant Difference ◽

Group 2 ◽

Ionomer Cement ◽

Group 1

Abstract Objective: To evaluate the influence of enamel etching on tensile bond strength of orthodontic brackets bonded with resin-reinforced glass ionomer cement. Materials and Methods: The sample group consisted of 15 patients who had indications for extraction of four premolars for orthodontic reasons, equally divided into two different groups according to bracket and enamel preparation. Brackets were bonded in vivo, by the same operator, using a split mouth random technique: Group 1 (control), phosphoric acid + Fuji Ortho LC; Group 2, Fuji Ortho LC without acid conditioning. The teeth were extracted after 4 weeks using elevators. An Instron Universal Testing Machine was used to apply a tensile force directly to the enamel-bracket interface at a speed of 0.5 mm/min. The groups were compared using a Mann-Whitney U-test and Weibull analysis. Results: Mean results and standard deviations (in MPa) for the groups were: Group 1, 6.26 (3.21), Group 2, 6.52 (2.73). No significant difference was observed in the bond strengths of the two groups evaluated (P = .599). Conclusions: Fuji Ortho LC showed adequate shear bond strength and may be suitable for clinical use.

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Resistance to Dislodgement of REBILDA® Post System to Intraradicular Dentin

Odovtos - International Journal of Dental Sciences ◽

10.15517/ijds.v19i2.28742 ◽

2017 ◽

Vol 19 (2) ◽

pp. 47

Author(s):

Daphne Ross DDS ◽

Carlos E. Filloy Esna DDS ◽

Juan Carlos Ramírez-Barrantes DDS, MSD, PhD

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Bond Strength ◽

Adhesive Systems ◽

Root Reinforcement ◽

Significant Difference ◽

Group 2 ◽

Push Out ◽

Scanning Electron ◽

Group 1

Currently there is controversy in the literature about clinical and adhesive effectiveness with respect to adhesive systems aimed to root reinforcement. Thus, the objective of this study was to evaluate the Push-Out bond strength between the Rebilda® post system and the intraradicular dentine. Thus, 28 unirradicular teeth were used, cut and standardized in 16 mm. The root segments were submitted to endodontic treatment; and then randomly divided into two groups, Group 1 (n = 14): Rebilda® DC + Futurabond DC; Group 2 (n = 14): RelyX ARC + Adper Scothbond Multipurpose Plus. Ten specimens from each group were submitted to the Push-Out Test. The remaining 4 specimens from each group were prepared for Scanning Electron Microscopy (SEM) in order to evaluate the formation of resinous extensions at the post-cement-dentin interface. Group 2 showed better results when compared to Group 1 regarding bond strength and in formation of resinous extensions or tags, but there was no statistically significant difference (p>0.05). It was concluded that the REBILDA® Post System promotes adequate bond strength to intraradicular dentin.

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Evaluation of the dislodgement resistance of bioceramic reparative cements placed in a retrograde cavity using a different technique

Brazilian Journal of Oral Sciences ◽

10.20396/bjos.v18i0.8657393 ◽

2019 ◽

Vol 18 ◽

pp. e191600

Author(s):

Hakan Gokturk ◽

Ismail Ozkocak ◽

Seda Tan-Ipek ◽

Osman Demir

Keyword(s):

Bond Strength ◽

Analysis Of Variance ◽

Cross Sections ◽

Calcium Silicate ◽

Testing Machine ◽

Hard Tissue ◽

Filling Materials ◽

Universal Testing ◽

Prior Application ◽

Push Out

Aim: Calcium silicate-based fillings have been widely used in surgical endodontic treatment because of hard-tissue conductive and inductive properties. The aim of present study is to investigate the bond strength of different calcium silicate-based fillings in retrograde cavities. Methods: Forty-four maxillary single rooted teeth were endodontically treated. The apical portions of the teeth were removed and root-end cavities were prepared using an ultrasonic tip. The roots were randomly divided into four experimental groups (n = 11) according to the material used; (1) MTA-FILLAPEX, (2) MTA Repair HP, (3) MTA-FILLAPEX+ MTA Repair HP, and (4) MTA Plus. Two horizontal cross sections (1±0.1 mm thick) from each specimen were resected from the apices. These sections were placed in a universal testing machine to evaluate the push-out bond strength force required for dislodgement of the root end filling was recorded. The failure type was also evaluated by using a stereomicroscope. The differences in bond strength were analyzed using the two-way analysis of variance (ANOVA). Results: MTA-FILLAPEX and MTA Plus displayed the lowest and highest dislocation resistance, respectively (P < 0.05). In the apical level, bond strength was significantly higher than the coronal level in all groups except for MTA-FILLAPEX. Mixed failure was prevalent in all groups, except for MTA-FILLAPEX, which showed purely cohesive failures. Conclusions: Investigated calcium silicate-based filling materials showed different bond strength to the root-end cavity. The bond strength was significantly decreased when the prior application of MTA-FILLAPEX before delivery of MTA Repair HP.

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Comparison of Shear Bond Strength of Four Types of Orthodontic Brackets with Different Base Technologies

APOS Trends in Orthodontics ◽

10.4103/apos.apos_91_17 ◽

2017 ◽

Vol 7 ◽

pp. 273-278

Author(s):

Gaurang H. Chaudhary ◽

Gianina Salton Mattevi ◽

Peter Thiuri Gakunga

Keyword(s):

Bond Strength ◽

Shear Bond Strength ◽

Testing Machine ◽

Group 4 ◽

Significant Difference ◽

Acid Etch ◽

Group 3 ◽

The Difference ◽

Group 2 ◽

Group 1

Objectives The aim of this study was to compare the shear bond strength (SBS) of brackets systems with four different base technologies. Materials and Methods Maxillary first premolars were randomly divided into four groups of thirty specimens each: (1) Master Series™ conventional twin, (2) T3™ self-ligating, (3) Victory series™ conventional twin, and (4) H4™ self-ligating brackets. Maxillary first premolars were bracketed using an acid-etch composite system, and the SBS measured using an Instron Universal Testing Machine at a crosshead speed of 2 mm/min. The ANOVA and Tukey’s multiple comparison tests were performed with significance predetermined at P ≤ 0.05. Results The overall mean bond strengths were 8.49 ± 2.93, 10.85 ± 3.34, 9.42 ± 2.97, and 9.73 ± 2.62 for the Groups 1, 2, 3, and 4 brackets, respectively. One-way ANOVA test gave an F = 3.182 with a P = 0.026. The Group 1 and Group 2 were observed to have statistically significant difference with a P = 0.014. Conclusions The T3 self-ligating one-piece design with microetched Quadra Grip™ base brackets had the highest bond strength. The SBS difference between Group 2, Group 3, and Group 4 was not significant, but the difference between Group 2 and Group 1 was statistically significant.

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Physical-Mechanical Properties of a Resin-Modified Calcium Silicate Material for Pulp Capping

Brazilian Dental Journal ◽

10.1590/0103-6440202003079 ◽

2020 ◽

Vol 31 (3) ◽

pp. 252-256

Author(s):

Taynnara Licéski Gasperi ◽

Josiane de Almeida Cava da Silveira ◽

Tamer Ferreira Schmidt ◽

Cleonice da Silveira Teixeira ◽

Lucas da Fonseca Roberti Garcia ◽

...

Keyword(s):

Mechanical Properties ◽

Bond Strength ◽

Calcium Silicate ◽

Testing Machine ◽

Dimensional Change ◽

Silicate Material ◽

Pulp Capping ◽

Universal Testing Machine ◽

Universal Testing ◽

Push Out

Abstract The purpose of this study was to investigate and to compare the physical-mechanical properties of a resin-modified calcium silicate material (TheraCal LC), used for pulp-capping, to MTA (Angelus) and a calcium hydroxide cement (Dycal). Specimens of each material (n=12) were prepared in Teflon molds (3.58 mm x 3 mm) and measured before and after immersion in distilled water for 24 h and 30 days to evaluate the dimensional change. The same specimens were submitted to compressive strength test on a Universal Testing Machine (Instron) (1 mm/min). Root canals were filled with the cements (n=8), and after 24 h, the bond strength (push-out test) to dentin was also assessed on a Universal Testing Machine (1 mm/min). Eight additional specimens of TheraCal LC were prepared to evaluate the bond strength immediately after light curing. Data were analyzed using One-Way ANOVA, and Tukey or Bonferroni post hoc tests (p<0.05). Percentage expansion of TheraCal LC was above the Specification No. 57 of ANSI/ADA, in both periods. The dimensional change for TheraCal LC was higher than MTA in 24 h and 30 days; and Dycal in 30 days (p<0.05). TheraCal LC had higher compressive and bond strength to dentin in comparison with MTA and Dycal (p<0.05). Although TheraCal LC expanded more than the ANSI/ADA recommendation, its compressive and push-out bond strength to dentin were satisfactory and superior to MTA and Dycal.

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Effects of Fluorosis and Self Etching Primers on Shear Bond Strengths of Orthodontic Brackets

European Journal of Dentistry ◽

10.1055/s-0039-1697428 ◽

2009 ◽

Vol 03 (03) ◽

pp. 173-177 ◽

Cited By ~ 7

Author(s):

Ahmet Yalcin Gungor ◽

Hakan Turkkahraman ◽

Necdet Adanir ◽

Huseyin Alkis

Keyword(s):

Bond Strength ◽

Testing Machine ◽

Orthodontic Brackets ◽

Universal Testing ◽

Adhesive Remnant Index ◽

Halogen Light ◽

Significant Difference ◽

Bond Strengths ◽

Group Ii ◽

Clinical Changes

ABSTRACTObjectives: To evaluate the effects fluorosis and self etching primers (SEP) on shear bond strengths (SBS) of orthodontic brackets.Methods: A total of 48 (24 fluorosed and 24 non-fluorosed) non-carious freshly extracted human permanent premolar teeth were used in this study. Fluorosed teeth were selected according to the modified Thylstrup and Fejerskov index (TFI), which is based on the clinical changes in fluorosed teeth. Fluorosed and non-fluorosed teeth were randomly assigned to 4 groups of 12 each. In groups I (non-fluorosed teeth) and II (fluorosed teeth), standard etching protocol was used and brackets were bonded with Light Bond. In groups III (non-fluorosed teeth) and IV (fluorosed teeth), Transbond Plus SEP was used and brackets were bonded with Transbond XT Light Cure Adhesive. All specimens were cured with a halogen light. After bonding, SBS of the brackets were tested with Universal testing machine. After debonding, all teeth and brackets in the test groups were examined under 10x magnifications. Any adhesive remained after debonding was assessed and scored according to the modified Adhesive Remnant Index (ARI).Results: ANOVA indicated a significant difference between groups (P<.001). SBS in group II (Light Bond+Fluorosis) were significantly lower than other groups. ARI scores of the groups were also significantly different (P<.001). There was a greater frequency of ARI scores of 1,2 and 3 in group II (Light Bond+Fluorosis).Conclusions: When standard etching protocol was used enamel fluorosis significantly decreased the bond strength of orthodontic brackets. Satisfactory bond strengths were obtained when SEP was used for bonding brackets to the fluorosed teeth. (Eur J Dent 2009;3:173-177)

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