scholarly journals Effect of Multiple Consecutive Adhesive Coatings on Microleakage of Class V Cavities

2009 ◽  
Vol 03 (03) ◽  
pp. 178-184 ◽  
Author(s):  
Hacer Deniz Arisu ◽  
Evrim Eliguzeloglu ◽  
Mine Betul Uctasli ◽  
Huma Omurlu ◽  
Emin Turkoz
Keyword(s):  
In Vitro Study ◽  
Adhesive Resin ◽  
Class V ◽  
Group Iii ◽  
Group I ◽  
Significant Difference ◽  
One Step ◽  
Group Ii ◽  
Self Etch

ABSTRACTObjectives: The purpose of this in vitro study was to evaluate the effect of multiple consecutive adhesive coatings of a one-step self-etch adhesive on microleakage of Class V cavities.Methods: Standardized box shaped Class V cavities were prepared onto the buccal side of forty five non-carious human premolar teeth. The teeth were randomly divided into three groups of fifteen teeth in each and restored as: Group I- one-step self-etch adhesive resin (Clearfil S3, Kuraray Co. Ltd., Osaka, Japan) was applied according to the manufacturer�s instructions, Group II- two consecutive same one-step self-etch adhesive application was performed, and Group III- three consecutive same one-step self-etch adhesive application was performed. After the adhesive applications light curing unit was activated for 20 seconds and the cavities were restored with a composite resin. The restorations were finished with aluminum oxide discs and the specimens were stored in water at room temperature for 24 hours before they were immersed in 2% methylene blue for 48 hours. The dye penetration was examined under a stereomicroscope and the asymtotic significance were analysed with Kruskall Wallis and Mann Whitney U tests and dentin-enamel margins were compared with each other with Wilcoxon Signed Rank test.Results: The microleakage at the dentinal margins of Class V cavities were significantly decreased with two (Group II) and three (Group III) consecutive adhesive applications (P<.05). There was no significant difference between Group I, Group II and Group III at the enamel margins (P<.05). The microleakage at the dentinal margins were significantly higher than the enamel margins in Group I and Group II but in Group III there was no statistically significant difference (P<.05).Conclusions: Within the limitations of this in vitro study, it may be concluded that three consecutive applications of the one-step self-etch adhesive resin provided better sealing than the one coat of adhesive resin at the dentinal margins of Class V cavities. (Eur J Dent 2009;3:178-184)

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 Assessment of shear bond strength of brackets bonded by direct and indirect techniques: an in vitro study

2012 ◽  
Vol 17 (4) ◽  
pp. 1-7 ◽  
Author(s):  
Roberto Hideo Shimizu ◽  
Karlos Giovani Grando ◽  
Isabela Almeida Shimizu ◽  
Augusto Ricardo Andriguetto ◽  
Ana Cláudia Moreira Melo ◽  
...  
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
In Vitro Study ◽  
Adhesive System ◽  
Vitro Study ◽  
Group Iii ◽  
Indirect Bonding ◽  
Group I ◽  
Group Ii

OBJECTIVE: This in vitro study was designed to evaluate the shear bond strength (SBS) of orthodontic metal brackets bonded by direct and indirect techniques. METHODS: Thirty healthy human maxillary premolar teeth were used. The teeth were divided into three groups of 10 teeth each: Group I - indirect bonding with SondhiTM Rapid-Set system (3M/Unitek), Group II - indirect bonding with TransbondTM XT adhesive system (3M/Unitek) and Group III - direct bonding with TransbondTM XT adhesive system (3M/Unitek). After bonding and obtaining the specimens for the study, the specimens were subjected to SBS testing in a universal testing machine (Emic, model DL-500). The Kolmogorov-Smirnov test was applied to ascertain that the data had a normal distribution and the Bartlett test to check whether there was homogeneity of variance. One-factor analysis of variance was performed and, subsequently, Tukey's test for paired means. A 5% significance level was adopted. RESULTS: The results of Group I were 67.6 (N) and 5.9 (MPa); Group II, 68.9 (N) and 6.1 (MPa) and Group III (control), 92.5 (N) and 8.1 (MPa). CONCLUSION: It can therefore be concluded that the means for Group III were significantly higher compared with Groups I and II in both Newton (N) and Megapascal (MPa) values. The means attained by the indirect bonding technique used in Groups I and II, however, exhibited no statistically significant differences.

scholarly journals An in vitro comparative Evaluation of Fracture Strength of Roots Instrumentated with Self-adjusting File and Reciproc Reciprocating File, with and without Obturation

2017 ◽  
Vol 1 (1) ◽  
pp. 20-25
Author(s):  
Pooja Kabra
Keyword(s):  
Fracture Strength ◽  
Comparative Evaluation ◽  
Group Iv ◽  
Control Group ◽  
Group V ◽  
Group Iii ◽  
Group I ◽  
Significant Difference ◽  
Group Ii

ABSTRACT Aim The purpose of this study was to evaluate the fracture strength of roots instrumented with the self-adjusting file (SAF; ReDent-Nova, Ra'anana, Israel) and the Reciproc reciprocating file and that were and were not obturated using the warm vertical lateral compaction technique. Materials and methods In total, 75 mandibular premolar teeth were sectioned at or below the cementoenamel junction to obtain roots 13 mm in length. The roots were balanced with respect to buccolingual and mesiodistal diameters and weight. They were distributed into four experimental groups and one control group (n = 15): No instrumentation (group I), instrumentation with SAF files but no obturation (group II), instrumentation with SAF files and obturated with warm vertical lateral compaction (group III), instrumentation with Reciproc File but no obturation (group IV), and instrumentation with Reciproc File and obturated with warm vertical lateral compaction (group V). AH Plus sealer (Dentsply DeTrey, Konstanz, Germany) was used along with gutta-percha points. One week later, a vertical load was applied to the specimen's canal until fracture occurred. Data were statistically analyzed using one-way analysis of variance (p = 0.05). Results The mean fracture load was 312.83 N for group I, 297.35 N for group II, 359.15 N for group III, 231.51 N for group IV, and 275.81 N for group V. Conclusion The fracture resistances exhibited a statistically significant difference between all the groups. Teeth instrumented by SAF exhibited a better fracture resistance. How to cite this article Tyagi S, Choudhary E, Kabra P, Chauhan R. An in vitro comparative Evaluation of Fracture Strength of Roots Instrumentated with Self-adjusting File and Reciproc Reciprocating File, with and without Obturation. Int J Clin Dent Res 2017;1(1):20-25.

FISSURE SEALANT INTERFACE MICROLEAKAGE USING ONE STEP ADHESIVES

2014 ◽  
Vol 1 (1) ◽  
pp. 49
Author(s):  
Sandy Christiono
Keyword(s):  
Blue Dye ◽  
Fissure Sealant ◽  
Whitney Test ◽  
Dye Penetration ◽  
Mann Whitney Test ◽  
Group I ◽  
Significant Difference ◽  
One Step ◽  
Group Ii

Background:This study evaluated the efficacy of a one step adhesives in reducing microleakage after water storage and thermocycling. Method: eighteen freshly extracted caries-free human premolars were used. The teeth were randomly divided into two groups; Group I: control etch adhesive (GC),Group II: G Bond One step adhesive (GC) The teeth were restored using helioseal Vivadent. Group II Each layer was cured using the Spectrum 800 curing light (Dentsply/Caulk) for 20 seconds at 600mW/cm2. The teeth were stored in artifisial saliva for 7 days in incubator. Samples were thermocycled 250x between 5°C and 55°C with a dwell of 30 seconds, then placed in a 0.5% methylene blue dye solution for 24 hours at 37°C. Samples were sectioned longitudinally and evaluated for microleakage at the occlusal and gingival margins under a microscope at 40x magnification. Dye penetration was scored: 0: no microleakage visible, score 1: microleakage up to half of the fissure, score 2: microleakage more than half of the fissure. Result: Mann-Whitney test was used to demonstrate significantly more dye penetration in Group I and Group II. When comparing the scores for two group, the Mann Whitney test showed no significant difference in dye penetration for etch and One step adhesive (p>0.05). Conclusion: Based on the results of this study, it can be concluded that etch and one step adhesive in the fissure sealant no significant difference to reduce of microleakage in study in vitro.

Effect of Bonding Agent on Retention of Different Sealants: An in Vitro Study

2021 ◽  
Vol 45 (3) ◽  
pp. 177-185
Author(s):  
Moaz H Attar ◽  
Medhat A Abdallah ◽  
Hussein A Alharthy ◽  
Omar A El Meligy
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
In Vitro Study ◽  
Bonding Agent ◽  
Micro Ct ◽  
Group Iii ◽  
Group I ◽  
Significant Difference ◽  
Sealant Retention

Objectives: To investigate the effect of Co-curing versus Staged-curing and No-bonding on retention of different resin-based sealants (RBS). Study design: For shear bond strength (SBS) and microleakage tests, 90 extracted premolars were divided equally into 3 groups (I, II, III). Each group was further subdivided equally into 3 subgroups (a, b, c). No-bonding subgroups did not receive a bonding agent, Staged-curing subgroups received a bonding agent that was cured before sealant application, while Co-curing subgroups received a bonding agent that was cured after sealant application. Seal-it was applied for group I, Helioseal-F for group II and Clinpro for group III. SBS buttons were tested using Instron machine, while microleakage specimens were examined using micro-CT. Results: Clinpro showed the highest SBS values in Staged-curing and No-bonding groups (8.72±2.39, 12.51±3.16) respectively. Staged-curing was significantly greater in SBS values than those for other groups (P&lt;0.05). There was a significant difference in microleakage values of Staged-curing among different RBS (P = 0.003), while there was no significant difference in values of No-bonding and Co-curing among different RBS (P = 0.541, P = 0.521). Conclusions: The use of a bonding agent as Staged-curing was more effective in improving sealant retention than No-bonding and Co-curing.

Effect of Different Pretreatment Methods on Dentin Bond Strength of a One-step Self-etch Adhesive

2009 ◽  
Vol 10 (1) ◽  
pp. 41-48 ◽  
Author(s):  
Emel Karaman ◽  
A. Rüya Yazici ◽  
Atila Ertan ◽  
Güi Özgünaltay ◽  
Berrin Dayangaç
Keyword(s):  
Bond Strength ◽  
Acid Group ◽  
Control Group ◽  
Air Abrasion ◽  
Group Iii ◽  
Group I ◽  
One Step ◽  
Laser Group ◽  
Group Ii ◽  
Self Etch

Abstract Aim The aim of this in vitro study was to evaluate the shear bond strength of a one-step self-etch adhesive to dentin pretreated with phosphoric acid, air abrasion, or laser. Methods and Materials Fifty-six extracted non-carious human mandibular molars were mounted and the occlusal surfaces ground with a mechanical grinder to obtain flat occlusal dentin surfaces. The teeth were randomly divided into four groups of 14 teeth according to the different dentin surface pretreatment methods: Group I- Acid, Group II- Laser, Group III- Air abrasion, Group IV (Control)- No surface treatment. After applying a one-step self-etch adhesive system, Futura Bond NR, cylinders of Z250 composite resin were bonded to the dentin surfaces by transparent gelatin capsules (2.5 mm diameter; 3 mm high) and then polymerized. All specimens were stored in distilled water at 37°C for 24 hours. Shear bond testing was carried out using an Universal testing machine with a crosshead speed of 0.5 mm/sec. Data were analyzed using the Kruskal Wallis and Mann-Whitney tests at a significance level of 0.05. Results The bond strength of air abrasion (Group III) and the control group (Group IV) were statistically higher than both the acid (Group I) and laser (Group II) pretreatments (p<0.05). No statistically significant differences were found in shear bond strength between surfaces treated with air abrasion and the control group (p>0.05). Surfaces pretreated with laser (Group II) resulted in the lowest bond strength which was not statistically different from those pretreated with acid (Group I) (p>0.05). Conclusion Surfaces pretreated with acid and laser adversely affected the bond strength of a one-step selfetch adhesive, Futura Bond NR, while pretreatment with air abrasion had no effect on bond strength. Clinical Significance The pretreatment of dentin surfaces prior to self-etch adhesive seems to be unnecessary and defeats the original purpose of these systems. Citation Yazici AR, Karaman E, Ertan A, Özgünaltay G, Dayangaç B. Effect of Different Pretreatment Methods on Dentin Bond Strength of a One-step Self-etch Adhesive. J Contemp Dent Pract 2009 January; (10)1:041-048.

scholarly journals COMPARISON OF THE AMOUNT OF APICAL EXTRUSION OF BACTERIA FOLLOWING THE USE OF DIFFERENT INSTRUMENTATION TECHNIQUES – AN IN VITRO STUDY

2011 ◽  
Vol 01 (04) ◽  
pp. 27-32
Author(s):  
Mithra N. Hegde ◽  
Snehal Thatte
Keyword(s):  
Culture Media ◽  
In Vitro Study ◽  
Control Group ◽  
Group Iii ◽  
Root Canals ◽  
Apical Extrusion ◽  
Significant Difference ◽  
Group Ii ◽  
Group 1

Abstract Objectives: The objective of this study is to compare the amount of extrusion of bacteria beyond the apical foramen after instrumentation with Crown down and Step-back techniques using a manual and engine driven nickel-titanium instruments Materials and Methods: Seventy-five mandibular premolars with similar dimensions were used for the study. Access cavities prepared and root canals contaminated with a suspension of Enterococcus faecalis. The contaminated teeth were then divided into three experimental groups. Group 1(Crowndown group) divided into two: Group 1–A Hand files: root canals were instrumented using K-files and Group 1B – Rotary files: root canals were instrumented using ProTaper instruments. Group II (Step-back group) divided into two: Group II A– Hand files: root canals were instrumented using K-files and group II B–Rotary files: the root canals were instrumented using Light Speed LSX instruments. Group III (control group): no instrumentation was done.Bacteria were extruded after preparation were collected into vials, microbiological samples were incubated in culture media for 24hrs. The CFUs were determined for each sample. The data obtained was analyzed using the Kruskal-Wallis one way analysis of variance and Mann-Whitney U-tests. Result: There was a significant difference in the amount of bacteria extruded by both Crowndown and Step-back. The Step- back hand method extruded significantly more bacteria when compared with Crowndown hand technique. Conclusion: All instrumentation techniques extruded intracanal bacteria apically. There was a significant difference in both the engine driven instrumentation techniques, while the hand instrumentation by Step-back extruded more bacteria.

scholarly journals A Comparative Evaluation of Microleakage of Glass Ionomer Restoration with Different Surface Protectors - an In-Vitro Study

2014 ◽  
Vol 02 (02) ◽  
pp. 105-108 ◽  
Author(s):  
Nupur Ninawe ◽  
Ullal Nayak ◽  
Priya Nagar ◽  
Vishal Khandelwal ◽  
Suyash Jain ◽  
...  
Keyword(s):  
High Speed ◽  
In Vitro Study ◽  
Restorative Material ◽  
Glass Ionomer ◽  
Class V ◽  
Surface Protection ◽  
Group Iii ◽  
Group I ◽  
Hand Piece

Abstract Aim: All the restorative material whatsoever introduced till-date have an inherent disadvantage of micro-leakage measurable different grades. The present study comparatively evaluates the micro-leakage of glass ionomer restoration with different surface protection methods. Methodology: 36 premolars were obtained without any cracks or restorations for the study. Teeth were stored in distilled water containing thymol crystals till the beginning of the study. The teeth were randomly divided into 3 groups based on surface protectors used. Group I is GC Fuji Varnish, Group II is vaseline and Group III is G-Coat plus along with GIC restoration. Class V cavities were prepared of dimensions mesio-distal width of 3 mm, occluso-gingival length of 2 mm, and a depth of 1.5 mm on buccal and lingual surfaces with a high-speed hand-piece with air-water spray. Results: Kruskal- Wallis test was applied and Vaseline group showed significantly less micro-leakage compared to G-Coat plus i.e. G-Coat plus exhibited significantly higher microleakage compared to other groups. Conclusion: Evaluation of micro-leakage of glass ionomer cements using various surface protecting agents, Vaseline was considered the best surface protecting agent maintaining the water balance and showing no micro-leakage.

scholarly journals Reinforcing Effects of Calcium Silicate-based Cement and Dual Cure Composite Resin in Simulated Immature Teeth with an Open Apex: An in vitro Study

2017 ◽  
Vol 10 (4) ◽  
pp. 351-357
Author(s):  
Murtuza S Zhabuawala
Keyword(s):  
Calcium Silicate ◽  
Fracture Resistance ◽  
Composite Resin ◽  
In Vitro Study ◽  
Group Iii ◽  
Immature Teeth ◽  
Group I ◽  
Significant Difference ◽  
Reinforcing Effects

ABSTRACT Aim To evaluate the fracture resistance of simulated immature teeth with an apical plug of biodentine followed by composite resin vs total obturation with biodentine tested immediately and after 3 months of aging and also to find out the chemical composition of dentin in contact with these materials. Materials and methods Extracted human maxillary central incisors with simulated immature apex with radicular dentin thickness (RDT) of 1 to 1.5 mm selected and divided into three groups of 20 each. Group I (control)—4 mm biodentine apically and thermoplasticized gutta-percha. Group II—4 mm biodentine apically and composite resin. Group III—complete obturation with biodentine. About 10 samples from each group were tested immediately and remaining 10 stored in phosphate buffered solution (PBS) and tested after 3 months for fracture resistance and chemical analysis of dentin. Results No significant difference in fracture resistance between the groups was observed when tested immediately. After 3 months of aging, only biodentine group showed a significant reduction in fracture resistance with increased Ca/P ratio of root dentine. Conclusion Biodentine group has shown drastic reduction in fracture resistance after 3 months of aging, and hence, cannot be recommended as a reinforcement material in immature teeth with thin dentin walls. How to cite this article Zhabuawala MS, Nadig RR, Pai VS, Gowda Y, Aswathanarayana RM. Reinforcing Effects of Calcium Silicate-based Cement and Dual Cure Composite Resin in Simulated Immature Teeth with an Open Apex: An in vitro Study. Int J Clin Pediatr Dent 2017;10(4):351-357.

scholarly journals Efficacy of Composite Restorative Techniques in Marginal Sealing of Extended Class V Cavities

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Salwa Khier ◽  
Khamis Hassan
Keyword(s):  
Digital Camera ◽  
Blue Dye ◽  
Class V ◽  
Group Iii ◽  
Dye Penetration ◽  
Group I ◽  
Multiple Comparison Test ◽  
Significant Difference ◽  
Light Curing ◽  
Group Ii

Objectives. To compare the efficacy of three placement techniques in marginal sealing of Class V composite restorations extending onto the root. Materials and Methods. Class V cavities were prepared on buccal surfaces of 30 extracted human molars, with gingival margins 1.5 mm on the root. Prepared teeth were randomly assigned into 3 groups of 10 each and restored with Single Bond/Filtek Supreme using following techniques; Group I: oblique; Group II: occlusogingival; and Group III: split-increment. After restoration finishing, teeth were thermocycled, and immersed in 2% methylene blue dye for 24 h. Teeth were sectioned buccolingually. Digital photographs were made of sectioned surfaces using digital camera fitted on stereomicroscope. Microleakage was scored at occlusal and gingival margins using 0–3 scale. Dye penetration depth (DPD) at both margins was also measured using AnalySIS software. Data were analyzed using one-way ANOVA and Bonferroni multiple comparison test. Results. 5% of occlusal margins in Groups I and III had 50  average (DPD). In Group II, only 10% of occlusal margins showed dye penetration, with 60  average depth. For gingival margins, Groups I and III presented dye penetration in 55% of specimens, with 220 and 150  average (DPD), respectively. Group II had 60% of gingival margins, with 230  average (DPD). There was no significant difference in microleakage at occlusal and gingival margins in all groups. Dye penetration was larger at gingival than at occlusal margins (). Conclusion. None of placement techniques produced gap-free margins. Oblique and occlusogingival techniques exhibited higher degrees of microleakage at occlusal and gingival margins, as compared to that of split-increment technique. Splitting flat composite increment by diagonal cut, prior to light-curing, preserved bonded gingival margin integrity and reduced microleakage.

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