MICROLEAKAGE OF CLASS II RESTORATION WITH COMPOSITE INLAY: AN IN VITRO STUDY

2016 ◽  
pp. 28-32
Author(s):  
Xuan Anh Ngoc Ho ◽  
Thien Man Tran
Keyword(s):  
Glass Ionomer Cement ◽  
In Vitro Study ◽  
Class Ii ◽  
Vitro Study ◽  
Significant Difference ◽  
Indirect Composite ◽  
Group 2 ◽  
Composite Inlay ◽  
Group 1

Background: Overcoming the obstacles of Class II restoration, especially the microleakage, is a polemic issue. The present study was performed to evaluate the microleakage of Class II restorations using three different techniques. Aims: The aim of this in vitro study was to evaluate the microleakage of Class II restorations using three different techniques. Materials and methods: The study was carried out in the laboratory with paired comparision between groups. Thirty Class II cavities were prepared on extracted non-carious human permanent molars, randomly divided into 3 groups, which were then restored with 3 different methods. Group 1: indirect composite inlay (Tetric N-Ceram) cemented with resin-modified glass ionomer cement (Fuji Plus); Group 2 indirect composite inlay (Tetric N-Ceram) cemented flowable composite (Tetric N-flow); Group 3: direct composite restoration using Tetric N-Ceram. Before immersed to 2% methylene blue solution for 12 hours, all restorations were subjected to thermal cycling (100 cycles 50C – 55 0C). The extent of dye penetration along the gingival wall was assessed using a grade scale from 0 to 3 under 40 times magnification using digital camera Nikon D7000. Results: All types of restorations showed some rate of microleakage. In comparing the three techniques, group 1 demonstrated the significantly higher rate of leakage compared to the others (p<0.05), whereas group 2 and 3 showed no significant difference. Conclusion: Different luting materials have different influences on the microleakage degree along gingival wall of Class II restoration. Key word: composite inlay, class II restoration, microleakage

Implants With Internal Hexagon and Conical Implant-Abutment Connections: An In Vitro Study of the Bacterial Contamination

2014 ◽  
Vol 40 (1) ◽  
pp. 30-34 ◽  
Author(s):  
Simonetta D'Ercole ◽  
Antonio Scarano ◽  
Vittoria Perrotti ◽  
Jorge Mulatinho ◽  
Adriano Piattelli ◽  
...  
Keyword(s):  
Bacterial Contamination ◽  
In Vitro Study ◽  
Vitro Study ◽  
Bacterial Suspension ◽  
Inflammatory Reactions ◽  
Implant Abutment ◽  
Group 2 ◽  
Group 1 ◽  
Internal Connections

Prevention of microbial leakage at the implant-abutment junction is a major challenge for the construction of 2-stage implants in order to minimize inflammatory reactions and to maximize bone stability at the implant neck. The aim of the present in vitro study was an evaluation of the leakage observed over a period of 28 days in Cone Morse taper internal connections and in screwed-abutments connections. In the present study 10 specimens of Cone Morse (Group 1) and 10 of internal hexagon (Group 2) implants were used. The inner parts of 5 implants per group were inoculated with Pseudomonas aeruginosa (PS) suspension and 5 implants per group with Aggregatibacter actinomycetemcomitans (AA). The possible penetration of bacterial suspension into the surrounding solution was determined by the observation of turbidity of the broth. In Group 1, bacterial contamination was found in 3 out of 5 implant-abutment assemblies seeded with the PS and in 2 samples out of 5 in the assemblies seeded with AA, with a total of leaked assemblies in this group of 5 out of 10. In Group 2, bacterial contamination was found in 4 out of 5 implant-abutment assemblies seeded with the PS, and in 4 out of 5 samples seeded with AA, with a total of leaked assemblies of 8 out of 10. The present data confirm the reported high permeability to bacterial leakage of screw-retained abutment connections, and the lower infiltration rates—although not significantly—of Cone Morse taper internal connections.

scholarly journals To Evaluate the Marginal Fit of Metal Copings Fabricated by Conventional Casting Procedure and Direct Metal Laser Sintering Technology – an In Vitro Study

2017 ◽  
Vol 05 (01) ◽  
pp. 039-046 ◽  
Author(s):  
Monica Sharma ◽  
Ajay Bansal ◽  
Sunny Panthi ◽  
Shefali Malik ◽  
Atulya Sharma
Keyword(s):  
Glass Ionomer Cement ◽  
In Vitro Study ◽  
Laser Sintering ◽  
Vitro Study ◽  
Direct Metal Laser Sintering ◽  
Marginal Fit ◽  
Significant Difference ◽  
Group A ◽  
Group B

Abstract Purpose: The purpose of this in vitro study was to evaluate marginal fit of cobalt- chromium (Co-Cr) copings fabricated by direct metal laser sintering system (DMLS) and conventional lost-wax technique (LW). Materials and method: Forty tooth preparations were carried out over extracted mandibular molars. They were divided into two groups A and B of 20 each. For group A Co-Cr copings were fabricated by direct metal laser sintering (DMLS) and for group B by lost wax technique (LW). Glass –ionomer cement (GIC) was used to tack the copings over their preparations. Marginal fit was then evaluated directly under the stereomicroscope. Results: The mean marginal gap of group A was 27.9 ± 2.4 μm and group B was 40.4 ±6 μm. Statistical analysis using t - test showed highly significant difference (P>.05) between the marginal mean of the DMLS (group A) compared to LW (group B). Conclusion: The DMLS copings demonstrated superior marginal fit compared to that of conventional Co-Cr casted copings.

scholarly journals Evaluation of sealing between abutment and inner connection of cone morse dental implant

2018 ◽  
Author(s):  
Derivaldo Moura Gois Filho ◽  
Vanessa Tavares de Gois-Santos ◽  
Ronaldo Santos Silva ◽  
Antônio Carlos Marqueti ◽  
Arthur Rodriguez Gonzalez Cortes ◽  
...  
Keyword(s):  
Dental Implants ◽  
Treatment Success ◽  
In Vitro Study ◽  
Study Results ◽  
Significant Difference ◽  
Group 2 ◽  
Dental Abutments ◽  
Scanning Electron ◽  
Group 1

Introduction: The adaptation of prostheses fixed over implants involves biomechanical aspects that are directly associated with treatment success. Objective: The aim of this in vitro study was to evaluate the presence of microgaps in the abutment/inner connection interface of cone morse dental implants. Materials and methods: Two groups of implants were analyzed. The first group (n = 16) employed single-manufacturer dental implants and abutments, whereas the second group (n = 16) combined multi-manufacturer materials. The sets were analyzed through scanning electron mi­croscopy, wherein microgaps between the implant connection and the abutment were observed. Results: Group 1 had an average microgap of 5.69 μm (SD ± 8.46 μm). Group 2 had an average microgap of 1.24 μm (SD ± 0.44 μm). A significant difference was found between the two groups (p = 0.002). Conclusion: Within the limitations of this study, results suggest that the group formed by multi-manufacturer implants and abutments (group 2) had smaller microgap values, and, therefore, a higher in vitro adaptation of components. DESCRIPTORS | Dental Implants; Dental Abutments; Scanning Electron Microscopy.

scholarly journals An In-vitro Study to Determine the Sealing Ability of Biodentine when used as a Class II Restorative Material

2020 ◽  
Author(s):  
Deebah Choudhary
Keyword(s):  
Base Material ◽  
In Vitro Study ◽  
Class Ii ◽  
Vitro Study ◽  
Blue Dye ◽  
P Value ◽  
Filling Material ◽  
Sealing Ability ◽  
Significant Difference

Introduction: Microleakage is a major setback to restorative dentistry. Leakage at the tooth/restoration interface may lead to numerous problems like postoperative sensitivity, recurrent caries, marginal sealing and later total failure of restoration. Aim: To determine the sealing ability (microleakage) of a new hydraulic calcium silicate cement (Biodentine) as a base material and a bulk filling material. Materials and Methods: An in-vitro study was conducted with ten freshly extracted maxillary molars from March 2019 to June 2019. Standardised Class II cavities were prepared on mesial and distal proximal surfaces. The twenty prepared samples were randomly divided into two groups (n=10)- G1 (BiodentineTM group) and G2 (BiodentineTM + Tetric N-Ceram group). The samples were subjected to thermocycling, followed by 1% methylene blue dye immersion. They were subsequently sectioned both buccolingually and mesiodistally in order to separate to proximal restorations (mesial and distal) and appreciate the amount of dye penetration at tooth/restoration interface respectively. Microleakage was evaluated by observing the samples under a stereomicroscope (30x). The data obtained was analysed using one-way ANOVA test and compared using Post-hoc test. p-value <0.05 to be considered significant. Results: Biodentine showed no significant difference between the sealing ability as a bulk filling and a base material. Group G2 (0.35) indicated comparatively less microleakage as compared to Group G1 (0.6) but the difference in microleakages in both groups was insignificant (p-value 0.083467). Conclusion: BiodentineTM exhibits microleakage when used as a bulk filling material and as a dentin substitute in Class II cavities since there is no significant difference in both the groups.

scholarly journals Comparative Evaluation of Self-etching Primers and Phosphoric Acid Effectiveness on Composite to Enamel Bond: An in vitro Study

2013 ◽  
Vol 14 (5) ◽  
pp. 790-795 ◽  
Author(s):  
G Vinay Kumar ◽  
Basanagouda S Patil ◽  
BK Raghavendra Rao ◽  
SM Sharathchandra ◽  
Reshma Hegde
Keyword(s):  
Phosphoric Acid ◽  
Bond Strength ◽  
Comparative Evaluation ◽  
In Vitro Study ◽  
Vitro Study ◽  
One Step ◽  
Group 3 ◽  
Group 2 ◽  
Group 1

ABSTRACT Aim The aim of the present study was to investigate the effectiveness of the one total-etch self-priming adhesive, one two-step self-etching primer adhesive, and one ‘all-in-one’ selfetching adhesive system on the adhesion of a resin composite to enamel. Materials and methods Thirty-six freshly extracted human mandibular molars were selected for this study. A flat area about 5 mm in diameter was created on the exposed mesial surface of enamel of each tooth by moist grinding with 320, 420 and 600 grit silicon carbide paper. Twelve teeth were randomly assigned into three groups. In group 1, Adper Easy One (3M ESPE), a one step self-etching primer adhesive was applied and light curing unit for 10 seconds. In group 2, Adper SE Plus, a twostep self-etching primer with bottle A containing the aqueous primer and bottle B containing the acidic adhesive was applied and light cured for 10 seconds. Group 3 (control)—etchant 37% phosphoric acid is applied to the surface for 15 seconds and rinsed with water and air dried and adhesive (single bond 2) is applied to the surface and tube is placed and light cured for 20 seconds. Composite material (Z350) was placed in the tube and light cured for 40 seconds in all the groups. Bond strength testing was done using universal testing machine at the enamel-composite interface. The debonded enamel surface was evaluated in stereomicroscope to assess the cohesive, adhesive or mixed fracture. Data was statistically analyzed by one way analysis of variance (ANOVA). Results Group 1 performed least among all groups with a mean score of 19.46 MPa. Group 2 had a mean score of 25.67 MPa. Group 3 had a mean score of 27.16 MPa. Conclusion Under the conditions of this in vitro study, the bond strength values of the two-step self-etching primer systems tested were similar to the total-etch. And, one step self-etching primers have lower bond strength compared to the total-etch. How to cite this article Patil BS, Rao BKR, Sharathchandra SM, Hegde R, Kumar GV. Comparative Evaluation of Selfetching Primers and Phosphoric Acid Effectiveness on Composite to Enamel Bond: An in vitro Study. J Contemp Dent Pract 2013;14(5):790-795.

scholarly journals Effect of Thermocycling on the Compressive Strength of Selected Luting Cements

2020 ◽  
Vol 17 (3) ◽  
Author(s):  
Al-Khadim Aws H. ◽  
Abdullah H. ◽  
Al-Ani Sarah T.
Keyword(s):  
Compressive Strength ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
In Vitro Study ◽  
Chemical Compositions ◽  
Luting Cements ◽  
Group 2 ◽  
Adhesive Cement ◽  
Group 1

Introduction: The purpose of this in vitro study was to evaluate the effect of thermocycling on the compressive strength of selected luting cements. Material and methods: 5 types of luting cements were tested. A total of thirty cylindrical specimens measuring 6mm in height and 4mm in diameter were prepared for each type of cement which were then divided into two groups ie Group 1: Exposure, and Group 2: Control. Both groups were stored in distilled water at 37°C for 24 hours. Group 1 was subjected to 500 cycles in a thermocycling baths of 5ºC and 55ºC with 20 seconds in each bath. Group 2 was not exposed to thermocycling procedure. The compressive strength for each cement type was determined by using a universal testing machine. Results: Resin adhesive cement had the highest compressive strength; followed by conventional glass ionomer cement (GIC) whilst resin modified GIC was the least. Thermocycling had no significant effect on the compressive strength of RelyXTM ARC and Fuji I (p>0.05), but a significant effect on Fuji I CAPSULE, Fuji CEM, Fuji Plus CAPSLUE (p<0.05) was observed. Conclusion: The effect of thermocycling on the compressive strength of luting cements differed considerably with respect to their chemical compositions.

scholarly journals SEM evaluation of gap at the resin dentin interface in Class II composite resin restoration: an in vitro study

2012 ◽  
Vol 10 (2) ◽  
pp. 98-104
Author(s):  
P Mazumdar ◽  
U Kumar Das ◽  
R Kundu
Keyword(s):  
Phosphoric Acid ◽  
Composite Resin ◽  
In Vitro Study ◽  
Class Ii ◽  
Composite Resins ◽  
Etching Technique ◽  
Flowable Composite ◽  
Significant Difference ◽  
Group 2

Introduction: Composite resins have become one of the most commonly used direct restorative materials for anterior and posterior teeth.Objectives: To observe and analyze the gap at the resin dentin interface in class II cavities restored with light cure composite resin in four experimental groups employing 37% phosphoric acid or self etching monomers and restored with /without light cure flowable composite resin.Methods: 40 sound maxillary first premolars, extracted due to orthodontic reasons was taken, distoproximal cavities were prepared and divided into 4 groups. Teeth of Group 1 was etched by 37% Phosphoric acid and light cure flowable composite resin was used, in group 2 ,two coats of self etching acidic monomer were applied and light cure flowable composite resin was used. Teeth of group 3 was etched with 37% phosphoric acid and restored without light cure flowable composite resin and in group 4, two coats of self etching acidic monomer were applied and restored without using light cure flowable composite resin material. Thermocycling was done after finishing and polishing and viewed under scanning electron microscope to observe and analyze the gap between tooth and the restoration.Result: Gap was observed at dentin-composite resin interface in all 4 groups. Results were evaluated by F-test and Manwhitney U test. No statistically significant difference was found.Conclusion: Use of flowable composite resin liner and the etching technique do not have any influence on the gap.DOI: http://dx.doi.org/10.3126/hren.v10i2.6571 Health Renaissance 2012; Vol 10 (No.2); 98-104

scholarly journals Fracture resistance of roots enlarged with various rotary systems and filled with various sealers

2019 ◽  
Vol 13 (3) ◽  
pp. 215-220
Author(s):  
Selen İnce Yusufoglu ◽  
Melek Akman ◽  
Makbule Bilge Akbulut ◽  
Ayce Ünverdi Eldeniz
Keyword(s):  
Fracture Resistance ◽  
Testing Machine ◽  
In Vitro Study ◽  
Universal System ◽  
Gutta Percha ◽  
Significant Difference ◽  
Ah Plus ◽  
Group 2 ◽  
Group 1

Background. This in vitro study compared the fracture resistance of roots instrumented either with ProTaper or One Shape rotary systems and filled with one of the silicate, epoxy resin or silicone-based sealers. Methods. Sixty single-rooted extracted mandibular premolars were decoronated to a length of 13 mm and then randomly divided into two main groups (n=30) in terms of the rotary system used for preparation. Group 1 samples were instrumented with the ProTaper Universal system up to a master apical file of #F2, while samples in group 2 were enlarged with One Shape system. The two main groups were then divided into 3 subgroups in terms of the sealer used (n=10) and filled with gutta-percha (either F2 or MM-GP points) of the rotary system used and one of the sealers as follows: group 1, BioRoot RCS + ProTaper F2 gutta-percha; group 2, AH Plus + ProTaper F2 gutta-percha; group 3, GuttaFlow + ProTaper F2 gutta-percha; group 4, BioRoot RCS+ MM-GP points; group 5, AH Plus + MM-GP points; and group 6, GuttaFlow + MM-GP points. Each specimen then underwent fracture testing by using a universal testing machine at a crosshead speed of 1.0 mm/min until the root fractured. Data were statistically analyzed. Results. Two-way ANOVA showed no significant differences between the groups. One Shape instruments showed significantly better fracture resistance compared to ProTaper instruments. Statistically, no significant difference was found between AHPlus, GuttaFlow and BioRoot RCS sealers. Conclusion. It can be concluded that the rotary system used for the instrumentation of teeth has some influence on the fracture resistance, while the root canal sealers do not have such an effect.

scholarly journals Sealing Ability of Three Different Surface Coating Materials on Conventional and Resin Modified Glass Ionomer Restoration in Primary Anterior Teeth: An In vitro Study

2021 ◽  
Author(s):  
Anshula Deshpande ◽  
Chirag Macwan ◽  
Steffi Dhillon ◽  
Medha Wadhwa ◽  
Neelam Joshi ◽  
...  
Keyword(s):  
Surface Coating ◽  
Glass Ionomer Cement ◽  
In Vitro Study ◽  
Glass Ionomer ◽  
Coating Materials ◽  
Anterior Teeth ◽  
Group 2 ◽  
Ionomer Cement ◽  
Group 1

Introduction: Microleakage is an important property that has been used in assessing the success of any restorative material used in restoring a tooth. Immediate application of a surface coating agent is suggested to protect glass ionomer cement against moisture contamination and dehydration during early setting. Aim: To compare marginal microleakage of two different Glass Ionomer Cement (GIC)- Conventional GIC and Resin Modified GIC in primary anterior teeth using three surface coating materials. Materials and Methods: An in vitro study was conducted between January 2014 to October 2017 on freshly extracted 40 anterior primary teeth which were randomly assigned into two main groups (Fuji II GIC and Fuji II LC GIC) with four subgroups (control-no surface coating, A=GC Fují Varnish II, B=GC G-Coat Plus, C=Icon). A standardised Class V cavity preparation was prepared on the labial surface of each tooth. Specimens were coated with two layers of nail varnish, leaving a 1 mm window around the cavity margins and placed in a solution of Methylene blue Dye for 24 hour at 37°C. The teeth were sectioned longitudinally in a buccolingual direction of the restorations and evaluated under stereomicroscope to check extent of dye penetration. The results were analysed by ANOVA and Tukey’s post-hoc test (p≤0.05). Results: It was found that maximum microleakage was seen in group 1 (Fuji II GIC) as compared to group 2 (Fuji II LC GIC) and it was non-significant (p=0.53). Ascending order for mean microleakage for Group 1 was as follows: Control >GC Fuji Varnish >Icon DMG >GC G-Coat and for Group 2: Control >GC Fuji Varnish >Icon DMG >GC G-Coat. Icon when compared with Gc coat and Varnish also showed non-significant (p=0.137) difference in Group 2. Conclusion: All three different surface coatings can seal glass ionomer restorations. The GC G-Coat Plus has the least microleakage on Resin-Modified GIC (RMGIC) compared to the other surface coatings. This would aid the clinicians to make appropriate decision regarding the choice of material to be used for restoration and coating in anterior primary teeth.

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