scholarly journals Evaluation of Fracture Resistance of Mandibular Premolar Canals Filled with Four Different Obturation Techniques- An In vitro Study

2021 ◽  
Author(s):  
Shubham Anil Mandhane ◽  
Sudha Mattigatti ◽  
Vincia Valencio Dsouza ◽  
Shraddha Nahar ◽  
Urmila Banshbahadur Chauhan ◽  
...  
Keyword(s):  
Root Canal ◽  
Fracture Resistance ◽  
In Vitro Study ◽  
Fracture Load ◽  
Group Iv ◽  
P Value ◽  
Group Iii ◽  
Gutta Percha ◽  
The Mean

Introduction: To prevent the ingress of microorganisms and their byproducts into root canal space is the primary goal of obturation. Endodontically treated teeth are weak and more susceptible to fracture than vital teeth. Therefore, to increase the strength of the root canal and increase root fracture resistance by adhesion and mechanically interlocking root canal filling material with radicular dentin is also one of the goal of obturation. Aim: To evaluate and compare the fracture resistance of mandibular premolar canals filled with four different obturation techniques. Materials and Methods: The in vitro study was conducted in Department of Conservative Dentistry and Endodontics, Krishna Institute of Medical Sciences (Deemed To Be University), Karad, Maharshtra, India, from August 2020 to December 2020. A total of 100 extracted human mandibular premolars with single canals were collected for the study and sectioned horizontally to obtain a standardised length of 14 mm. With the help of 15 K-file (Dentsply) working length was determined and root canals were prepared to an International Organisation for Standardisation (ISO) size 45 file at the apex and flared using a #4 Gates-Glidden drill (Mani, Japan). The teeth were then randomly divided into four experimental groups, Group I-Lateral condensation, Group II-ROEKO GuttaFlow® bioseal, Group III- Guttacore, Group IV-Thermoplasticised gutta percha (System B) and two control groups, they were Group V-(Negative control), instrumentation was done, but no obturation, Group VI-(Positive control), teeth were neither instrumented nor obturated. All the experimental teeth were filled as per the obturation technique. A universal testing machine was used for evaluating fracture resistance. The results were analysed using the One-way ANOVA test. The significance between the groups was tested with Scheffe’s post hoc test. Results: There were statistically significant difference among six group for mean fracture load (N) with p-value <0.001. furthermore, pair wise comparison of fracture load (N) showed that the mean difference is significant at p-value <0.05. The mean difference between Group IV and V was not significant (p-value=0.935) Conclusion: Under the limitation of this study, it was concluded that the resistance of the root to vertical fracture amongst the experimental group was maximum in Group III (Guttacore) and minimum in Group IV (Thermoplasticised gutta-percha, System B).

scholarly journals Fracture Resistance of Composite Veneers with Different Preparation Designs

2016 ◽  
Vol 20 (2) ◽  
pp. 99-103
Author(s):  
Katerina Zlatanovska ◽  
Ljuben Guguvcevski ◽  
Risto Popovski ◽  
Cena Dimova ◽  
Ana Minovska ◽  
...  
Keyword(s):  
Fracture Resistance ◽  
In Vitro Study ◽  
Fracture Load ◽  
Group 3 ◽  
The Mean ◽  
Group 2 ◽  
Preparation Design ◽  
Frequent Localization ◽  
Group 1

Summary Background: The aim of this in vitro study was to examine the fracture load of composite veneers using three different preparation designs. Material and methods: Fifteen extracted, intact, human maxillary central incisors were selected. Teeth were divided into three groups with different preparation design: 1) feather preparation, 2) bevel preparation, and 3) incisal overlap- palatal chamfer. Teeth were restored with composite veneers, and the specimens were loaded to failure. The localization of the fracture was recorded as incisal, gingival or combined. Results: Composite veneers with incisal overlap - palatal chamfer showed higher fracture resistance compared to feather preparation and bevel preparation. The mean (SD) fracture loads were: Group 1: 100.6±8.0 N, Group 2: 107.4±6.8 N, and Group 3: 122.0±8.8 N. The most common mode of failure was debonding for veneers with feather preparation and fracture when incisal edge is reduced. The most frequent localization of fracture was incisal. Conclusion: The type of preparation has a significant effect on fracture load for composite veneers. This study indicates that using an incisal overlap- palatal chamfer preparation design significantly increases the fracture resistance compared to feather and bevel preparation designs.

scholarly journals The effect of insertion and photopolymerization techniques on microleakage of Class V cavities: a quantitative evaluation

2005 ◽  
Vol 19 (1) ◽  
pp. 30-35 ◽  
Author(s):  
Fabiana Mantovani Gomes França ◽  
Frederico Seidi Hori ◽  
Alex José Souza dos Santos ◽  
José Roberto Lovadino
Keyword(s):  
In Vitro Study ◽  
Root Surface ◽  
Group Iv ◽  
Class V ◽  
Mean Values ◽  
Group Iii ◽  
Soft Start ◽  
Light Curing ◽  
The Mean

The aim of this in vitro study was to evaluate by spectrophotometry the influence of the incremental technique and progressive light curing in the microleakage of Class V cavities. Forty samples were prepared with class V cylindrical cavities on the buccal root surface of bovine incisive teeth and filled with composite resin (Z250). The samples were divided into four groups: I: cavity was bulk filled and the composite was light cured for 40 seconds; Group II: cavity was bulk filled and a "soft-start" polymerization was used; Group III: cavity was filled with the incremental technique in two coats and light cured for 40 seconds; Group IV: cavity was filled with the incremental technique in two coats and light cured with "soft-start" polymerization. After the restoration, the specimens were thermally stressed for 3,000 cycles in bath at 5 ± 2°C and 55 ± 2°C, protected with nail enamel, colored with 2% methylene blue and cut into sections. These sections were triturated and the dye was recovered with PA ethanol and the supernatant was evaluated. The data were submitted to ANOVA and the results showed the following averages: bulk filled and conventional photopolymerization (I) 0.06075 µg/ml; bulk filled and progressive photopolymerization (II) 0.04030 µg/ml; incremental insertion and conventional photopolymerization (III) 0.04648 µg/ml; incremental insertion and progressive photopolymerization (IV) 0.04339 µg/ml. No significant statistic differences were observed among the mean values. The Degulux "soft-start" equipment probably emits too high initial light intensity to promote progressive photopolymerization.

scholarly journals Effect of Hand and Rotary Instruments on the Fracture Resistance of Teeth: An In Vitro Study

2020 ◽  
Vol 8 (2) ◽  
pp. 38
Author(s):  
Nisha Acharya ◽  
Md Riasat Hasan ◽  
Dashrath Kafle ◽  
Anil Chakradhar ◽  
Takashi Saito
Keyword(s):  
Fracture Resistance ◽  
Testing Machine ◽  
Compressive Load ◽  
In Vitro Study ◽  
Group Iv ◽  
Group Iii ◽  
Group I ◽  
Significant Difference ◽  
Group Ii

Objective: Endodontic treatment should be both conservative and effective. Endodontic instruments with a greater taper are used for coronal flaring, for proper debridement with efficient irrigation. However, increased taper of an instrument can remove a larger amount of pericervical dentin, compromising the strength of the tooth. The aim of this study was to determine the effect of hand files, ProTaper Universal, ProTaper Next, and V Taper rotary instrument systems on the fracture resistance of teeth. Materials and Methods: In total, 60 extracted human maxillary first premolars were divided into four groups—Group I (Hand Files; HF), Group II (ProTaper Universal; PT), group III (ProTaper Next; PTN) and Group IV (V Taper; VT) (N = 15). Each group was instrumented with the respective instrument system, irrigated, obturated, restored, and mounted in cold cure acrylic. A universal load-testing machine (Shimadzu, Japan) was used to apply a vertical compressive load. The maximum force was recorded in Newton. Analysis of variance (ANOVA) and Independent t-tests were applied to compare the maximum mean force required to fracture the tooth. Results: There was a statistically significant difference in fracture resistance between Group I (HF) and Group II (PT) and between Group II (PT) and Group IV (VT) (p < 0.001). Similarly, a significant difference was observed between Group II (PT) and Group III (PTN) (p < 0.01). Furthermore, a significant difference was observed between Group I (HF) and Group III (PTN), and between Group III (PTN) and Group IV (VT) (p < 0.05), too. However, there was no statistically significant difference between Group I (HF) and group IV (VT) (p > 0.05). Conclusion: Rotary files with more taper seem to remove more pericervical dentin than traditional manual and rotary files with less taper, thus altering the strength of the tooth.

scholarly journals COMPARATIVE EVALUATION OF THREE DIFFERENT COMPOSITE PLACEMENT TECHNIQUE USING DIFFERENT MODES OF CURING LIGHT ON PRIMARY TEETH: AN IN-VITRO STUDY

2019 ◽  
Vol 3 (8) ◽  
Author(s):  
Jyoti Sharma ◽  
Bhagwat Swaroop Sharma ◽  
Dr Updesh Masih ◽  
Manisha Upadhyay ◽  
Nilotpol Kashyap ◽  
...  
Keyword(s):  
High Intensity ◽  
In Vitro Study ◽  
P Value ◽  
Class V ◽  
Pulse Delay ◽  
Group Iii ◽  
Group I ◽  
The Mean ◽  
Placement Technique

Background: For the past several years, different techniques and materials have been examined to reduce microleakage in class V restorations. Thus both the quantity and quality of polymerization can be improved with proper selection of light curing modes and clinical placement techniques Aim: The aim of the present study was to evaluate and compare which is one of the best placement technique and mode of curing to reduce microleakage. Material and method: Class V cavities were prepared in 135 teeth. Teeth were divided into 3 groups of 45 each using three different placement technique with two different composite. Each group was further subdivided into 15 teeth cured by different curing modes. Results: The ‘p’ value of the mean scores of all the groups when cured with high intensity mode is 0.004 (≤0.05) indicating that the results are statistically significant. But the ‘p’ value of the mean scores of all the groups when cured with pulse delay and ramped mode is 0.603 and 2.167(≥0.05) indicating that the results are not statistically significant.  The ‘p’ value of the mean scores of group I and group II when cured with different mode is 0.065 and 0.085(≥0.05) indicating that the results are not statistically significant. But the ‘p’ value of the mean scores of the group III when cured with different mode is 0.001(≤0.05) indicating that the results are statistically significant. Conclusion: Split increment horizontal technique showed least microleakage despite of curing modes. Although curing modes did not show statistically significant results but high intensity showed least microleakage. Keywords: composite, G.V Black Classification, polymerization shrinkage, curing modes

scholarly journals COMPARATIVE EVALUATION OF RETENTION AND FRACTURE RESISTANCE OF ENDODONTICALLY TREATED TEETH REINFORCED WITH THREE DIFFERENT POSTS SYSTEMS: AN IN VITRO STUDY

2020 ◽  
pp. 1-3
Author(s):  
Deebah Choudhary
Keyword(s):  
Stainless Steel ◽  
Glass Fiber ◽  
Fracture Resistance ◽  
In Vitro Study ◽  
Fracture Load ◽  
Fiber Post ◽  
Endodontically Treated Teeth ◽  
Glass Fiber Post ◽  
The Mean

Aim: To compare the retention and fracture resistance of three different pre-fabricated posts systems in endodontically treated anterior tooth. Materials and Methods: Root canal treatment was performed for all the 90 samples used in the study. After the completion of obturation, post space preparation was done accompanied by post cementation. The samples were divided into three groups depending on the post cemented (Stainless Steel, Glass fiber and Ceramic post). The samples were first evaluated for retention with a help of a three-jaw chuck, which grasped the post and tried to pull it out. The force required to dislodge each post was recorded in Newtons. To evaluate the fracture resistance, the samples were subjected to compressive loads at an angle. The load required was then recorded in Newtons. Results: The mean retention values for Stainless Steel post were significantly greater than those for Glass fiber post and Ceramic post. The mean retention values of glass-fiber post and ceramic post were not statistically different. The fracture load of the post system, it was revealed that highest mean value was seen in Stainless Steel post and was significant than ceramic post and glass-fiber post. Conclusion: Within the limitation of this study, it can be concluded that the pre-fabricated stainless steel post exhibits a significantly higher fracture resistance and also the retention was more as compared to Glass fiber post and Ceramic post.

scholarly journals Comparative evaluation of Fracture Resistance of Endodontically Treated Teeth Obturated with Pozzolan-based MTA Sealer and Epoxy Resin-based Sealer: An in vitro Study

2017 ◽  
Vol 8 (1) ◽  
pp. 37-40 ◽  
Author(s):  
Sree Theja Upadhyay ◽  
Tina Puthen Purayil
Keyword(s):  
Epoxy Resin ◽  
Root Canal ◽  
Fracture Resistance ◽  
Comparative Evaluation ◽  
In Vitro Study ◽  
Endodontically Treated Teeth ◽  
Group Iii ◽  
Group I ◽  
Ah Plus

ABSTRACT Aim To evaluate and compare the effect of epoxy resin-based sealer and a pozzolan-based mineral trioxide aggregate (MTA) sealer on the fracture resistance of endodontically treated teeth. Materials and methods Thirty single-rooted mandibular premolars were decoronated to a standardized root length of 15 mm. ProTaper rotary files up to a master apical file size of F3 were used for cleaning and shaping the root canals followed by 2.5% sodium hypochlorite irrigation. The teeth were randomly divided into three groups (n = 10 each), and the obturation was completed using gutta-percha with Endoseal MTA (group I) and AH Plus (group II) as root canal sealers. Group III served as control (instrumented and unfilled). Each specimen was then subjected to fracture testing by using a universal testing machine at a crosshead speed of 1.0 mm/minute until fracture. The force required to fracture each specimen was recorded and the data were subjected to statistical analysis using one-way analysis of variance (ANOVA), followed by pairwise comparison using post hoc Games-Howell test (p < 0.05). Results The fracture resistance of groups I and II were significantly higher than those of group III. No significant difference in the fracture resistance was observed between group I (Endoseal MTA) and group II (AH Plus) groups. Conclusion It can be concluded that the new root canal sealer, Endoseal MTA, is able to reinforce the tooth against fracture as good as AH Plus. Clinical significance Endoseal MTA is a sealer for the reinforcement of endodontically treated teeth. How to cite this article Upadhyay ST, Purayil TP, Ginjupalli K. Comparative evaluation of Fracture Resistance of EndodonticallyTreated Teeth Obturated with Pozzolan-based MTA Sealer and Epoxy Resin-based Sealer: An in vitro Study. World J Dent 2017;8(1):37-40.

scholarly journals A Comparative Evaluation of Fracture Resistance of Endodontically Treated Teeth restored with Composite Resin Core using Two Different Designs of Prefabricated Metal Posts: An in vitro Study

2017 ◽  
Vol 7 (2) ◽  
pp. 97-102
Author(s):  
Sabita M Ram ◽  
Naisargi Shah ◽  
Amit M Gaikwad
Keyword(s):  
Fracture Resistance ◽  
Comparative Evaluation ◽  
Composite Resin ◽  
Fracture Load ◽  
Endodontically Treated Teeth ◽  
Group I ◽  
Resin Core ◽  
Post And Core ◽  
The Mean

ABSTRACT Aim To comparatively evaluate the fracture resistance of endodontically treated teeth restored with light-cured composite resin core using two different designs of prefabricated metal posts. Materials and methods A total of 30 single-rooted anterior teeth were selected for the study and endodontically treated. Teeth were sectioned 2 mm above the cementoenamel junction and were randomly divided into two groups (n = 15). Teeth in group I were restored with Parallel post—EG post and group II with parallel post with coronal flare—i post. Light-cured composite core buildup was done in all samples using a customized core former. Compressive load was applied at a 135° angle to the long axis of the tooth at a cross-head speed of 1 mm/minute until visible signs of fracture were observed. Levene's test and t-test were used to determine the difference of the failure loads between the groups (α = 0.05). Results The mean values (standard deviation [SD]) for fracture resistance were 295.55 N and 469.59 N for parallel post—EG post and parallel post with coronal flare—i post respectively. Since the p-value for the t-test is less than 0.05, it indicates that we should reject null hypothesis and conclude that the mean fracture load of parallel post with coronal flare—i post is significantly more than that of mean fracture load of parallel post—EG post. Conclusion The study conducted evaluated that the fracture resistance of endodontically treated teeth with parallel post with coronal flare—i post and core buildup had better strength as compared with parallel post—EG post and core buildup. Clinical significance The present study will help the clinician to select the appropriate prefabricated metal post that will fit exactly into the coronal flare of the canal improving clinical performance, thus increasing the longevity of the restoration. How to cite this article Gaikwad AM, Shah N, Ram SM. A Comparative Evaluation of Fracture Resistance of Endodontically Treated Teeth restored with Composite Resin Core using Two Different Designs of Prefabricated Metal Posts: An in vitro Study. J Contemp Dent 2017;7(2):97-102.

scholarly journals The Effect of Flowable Composite Lining Thickness with Various Curing Techniques on Microleakage in Class II Composite Restorations: An in vitro Study

2013 ◽  
Vol 14 (1) ◽  
pp. 56-60 ◽  
Author(s):  
S Nagalaxmi Reddy ◽  
DN Jayashankar ◽  
Mohanthomas Nainan
Keyword(s):  
In Vitro Study ◽  
Class Ii ◽  
Group Iv ◽  
Group V ◽  
Group Iii ◽  
Flowable Composite ◽  
Composite Restorations ◽  
Group I ◽  
Composite Lining

ABSTRACT Aim Aim of this study was to compare class II composite restoration using flowable composites as lining with various thickness and curing techniques by evaluating cervical marginal microleakage. Materials and methods Fifty intact molars, each prepared with two box-only class II cavities, were randomly divided into five groups: Group I, P60 filling alone; group II, ultrathin flowable composite lining (0.5-1mm) cocured with overlying composite; group III, thin lining (1-1.5) cocured with overlying composite; group IV, ultrathin lining (0.5-1 mm) precured and group V, thin lining (1-1.5) precured. The teeth were then thermocycled for 1500 cycles (between 5 and 60 °C) and immersed in dye for 24 hours. Cervical microleakage was measured as the extent of dye penetration. Results Cocured specimens (groups II and III) showed least microleakage and control specimens (group I) showed maximum microleakage. On comparison of curing techniques, cocured specimens (groups II and III) showed less microleakage than precured (groups IV and V). On comparison of lining thickness and type of curing, group IV showed less microleakage than group V. Groups II and III were statistically not significant. Conclusion It was concluded from the results that ultrathin cocured flowable composite lining specimens improved the marginal sealing with decreased microleakage. Clinical significance In this study, the application of additional flowable composite lining with various thicknesses presented different influences in marginal quality of class II box only composite restorations. A new technique applying an ultrathin flowable composite lining with cocuring technique improved the marginal sealing with decreased microleakage. Restorations with thin lining presented reduced marginal integrity after thermocycling. How to cite this article Reddy SN, Jayashankar DN, Nainan M, Shivanna V. The Effect of Flowable Composite Lining Thickness with Various Curing Techniques on Microleakage in Class II Composite Restorations: An in vitro Study. J Contemp Dent Pract 2013;14(1):56-60.

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