scholarly journals Fracture Strength and Marginal Adaptation of Conservative and Extended MOD Cavities Restored with Cention N

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Maryam Firouzmandi ◽  
Ali Asghar Alavi ◽  
Dana Jafarpour ◽  
Soroush Sadatsharifee
Keyword(s):  
Fracture Strength ◽  
Resin Composite ◽  
Testing Machine ◽  
Marginal Adaptation ◽  
Cavity Preparation ◽  
Universal Testing ◽  
Significant Difference ◽  
Different Types ◽  
Maxillary Premolars ◽  
Analyze Data

The aim of the present study was to compare the fracture strength and marginal adaptation of MOD cavities restored with Cention N, bonded Cention N, and resin composite, as well as to investigate the effect of cavity preparation volume on those properties. In this experimental study, 120 human maxillary premolars were randomly divided into six groups according to the type of restoration and cavity volume (n = 20): (I) conservative MOD restored with Cention N, (II) conservative MOD restored with bonded Cention N, (III) conservative MOD restored with Z250 resin composite, (IV) extended MOD restored with Cention N, (V) extended MOD restored with bonded Cention N, and (VI) extended MOD restored with Z250 resin composite. Fracture strength (MPa) was tested using a universal testing machine. To investigate marginal adaptation, polyvinyl-siloxane impressions were taken and poured with epoxy resin. Resin replicas were examined by SEM (×400) for marginal adaptation. ANOVA tests, Tukey’s test, and independent t-test were used to analyze data ( P  ≤ 0.05). Among conservative restorations, the fracture strength of bonded Cention N was significantly greater than that of Cention N ( P  = 0.001), while in the extended preparations, there was no significant difference between fracture strengths of different types of restorations ( P  = 0.579). In terms of marginal adaptation, there was no significant difference between different types of conservative restorations ( P  = 0.232). However, in extended preparations, composite showed significantly lower marginal adaptation than Cention N and bonded Cention N ( P  = 0.004 and P  = 0.045, respectively). Conservative preparations showed significantly greater fracture strength and marginal adaptation compared to extended ones in groups restored with composite. The volume of cavity preparation was shown to be effective in the materials fracture strength and marginal adaptation. Cention N showed promising results in terms of fracture strength and marginal adaptation.

scholarly journals Tooth structure and fracture strength of cavities

2007 ◽  
Vol 18 (2) ◽  
pp. 134-138 ◽  
Author(s):  
José Mondelli ◽  
Fábio Sene ◽  
Renata Pereira Ramos ◽  
Ana Raquel Benetti
Keyword(s):  
Mass Loss ◽  
Fracture Strength ◽  
Composite Resin ◽  
Testing Machine ◽  
Cavity Preparation ◽  
Tooth Structure ◽  
Universal Testing ◽  
Significant Difference ◽  
Before And After

This study evaluated, in vitro, the loss of tooth substance after cavity preparation for direct and indirect restorations and its relationship with fracture strength of the prepared teeth. Sixty sound human maxillary first premolars were assigned to 6 groups (n=10). MOD direct composite cavities (Groups I, II and III) and indirect inlay cavities (Groups IV, V and VI) were prepared maintaining standardized dimensions: 2-mm deep pulpal floors, 1.5-mm wide gingival walls and 2-mm high axial walls. Buccolingual width of the occlusal box was established at 1/4 (Groups I and IV), 1/3 (Groups II and V) or 1/2 (Groups III and VI) of the intercuspal distance. Teeth were weighed (digital balance accurate to 0.001 g) before and after preparation to record tooth substance mass lost during cavity preparation. The prepared teeth were submitted to occlusal loading to determine their fracture strength using a universal testing machine at a crosshead speed of 0.5 mm/min. Data were analyzed by two-way ANOVA and Tukey test (alpha= 0.05). 1/4-inlay cavities had higher percent mean mass loss (9.71%) than composite resin cavities with the same width (7.07%). 1/3-inlay preparations also produced higher percent mean mass loss (13.91%) than composite resin preparations with the same width (10.02%). 1/2-inlay cavities had 21.34% of mass loss versus 16.19% for the 1/2-composite resin cavities. Fracture strength means (in kgf) were: GI = 187.65; GII = 143.62; GIII = 74.10; GIV = 164.22; GV = 101.92; GVI = 50.35. Statistically significant difference (p<0.05) were observed between Groups I and IV, II and V, III and VI. Higher tooth structure loss and lower fracture strength were recorded after preparation of inlay cavities, regardless of the width of the occlusal box, compared to the direct composite resin cavities.

Influence of Different Restoration Techniques on Fracture Resistance of Root-filled Teeth: In Vitro Investigation

2018 ◽  
Vol 43 (2) ◽  
pp. 162-169 ◽  
Author(s):  
ME Hshad ◽  
EE Dalkılıç ◽  
GC Ozturk ◽  
I Dogruer ◽  
F Koray
Keyword(s):  
Fracture Strength ◽  
Resin Composite ◽  
Testing Machine ◽  
Compressive Force ◽  
Control Group ◽  
Hybrid Resin ◽  
Flowable Composite ◽  
In Vitro Investigation ◽  
Significant Difference

SUMMARY Objective: The purpose of this study was to determine the fracture strength of endodontically treated mandibular premolar teeth restored with composites and different reinforcement techniques. Methods and Materials: Forty-eight freshly extracted human mandibular premolar teeth were randomly divided into four groups: group IN, group CR, group FRC, and group PRF. Group IN consisted of teeth with intact crowns and served as the control group. In the other three groups, endodontic treatment was performed and standard mesio-occluso-distal (MOD) cavities were prepared. Then cavities were restored with hybrid resin composite only, flowable composite and hybrid resin composite, and Ribbond, flowable composite and hybrid resin composite in groups CR, FRC and PRF, respectively. All of the teeth were subjected to fracture by means of a universal testing machine, and compressive force was applied with a modified stainless-steel ball at a crosshead speed at 0.5 mm/min. Results: The highest values were observed in group IN, while the lowest values were determined in group CR. There was not any statistically significant difference between group CR and group FCR (p&gt;0.05). When groups CR, FCR, and PRF were compared, group PRF showed significantly better fracture strength than did groups CR and FCR (p&lt;0.05). It was determined that there was not any significant difference between group IN and group PRF (p&gt;0.05). Conclusions: Polyethylene ribbon fiber considerably increases the fracture strength of mandibular premolar teeth with MOD cavities restored with composite.

Effect of Adhesive Boosters on Bond Strength of Bleached Teeth in Orthodontic Bonding

2021 ◽  
pp. 030157422110044
Author(s):  
I Ranganayakulu ◽  
D Praveen Kumar Varma ◽  
Padma Priya CV ◽  
RSVM Raghu Ram ◽  
K Anand Viswanadh ◽  
...  
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Orthodontic Brackets ◽  
Carbamide Peroxide ◽  
Universal Testing Machine ◽  
Universal Testing ◽  
Significant Difference ◽  
Maxillary Premolars ◽  
And Control

Objectives: To evaluate and compare the effect of adhesion boosters on shear bond strength (SBS) of orthodontic brackets on bleached teeth. Materials and Methods: A sample of 90 extracted maxillary premolars was equally divided into 2 groups of bleached and non-bleached teeth. Twenty-two percent carbamide peroxide gel was used as an agent for bleaching. Each group was further divided equally into 3 subgroups depending on the type of adhesive booster used (Enhance LC, All-bond 2, and no adhesive booster [control]) and maxillary premolars brackets were bonded. Debonding was done with a universal testing machine, and the SBS was recorded. Results: The SBS of non-bleached teeth was highest for All-bond 2 (14.78 ± 2.47 MPa) followed by Enhance LC (13.15 ± 3.49 MPa) and control (10.30 ± 1.06 MPa). The SBS of bleached teeth was highest for All bond 2 (12.23 ± 1.41 MPa) followed by Enhance LC (11.76 ± 1.71 MPa) and control (9.63 ± 1.06 MPa). All subgroups showed a significant difference in SBS (P = .000) on bleached and non-bleached teeth. The SBS showed a significant difference between the bleached and non-bleached teeth in All-bond 2 group (P = .019). Conclusion: Adhesive boosters increased the SBS of both bleached and non-bleached teeth significantly. Among the two adhesive boosters used, All-bond 2 showed more SBS values.

scholarly journals Can Fiber Application Affect the Fracture Strength of Endodontically Treated Teeth Restored with a Low Viscosity Bulk-Fill Composite?

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Evrim Eliguzeloglu Dalkılıç ◽  
Magrur Kazak ◽  
Duygu Hisarbeyli ◽  
Mehmet Ali Fildisi ◽  
Nazmiye Donmez ◽  
...  
Keyword(s):  
Fracture Strength ◽  
Fracture Resistance ◽  
Testing Machine ◽  
The Other ◽  
Control Groups ◽  
Endodontically Treated Teeth ◽  
Low Viscosity ◽  
Universal Testing ◽  
Significant Difference ◽  
Insertion Techniques

Objective. The aim of this study is to evaluate the effects of different fiber insertion techniques and thermomechanical aging on the fracture resistance of endodontically treated mandibular premolar teeth restored using bulk-fill composites. Materials and Methods. Eighty human mandibular premolar teeth were randomly divided into eight groups: Group IN, Group BF, Group PRF1, Group PRF2, Group IN-TMA, Group BF-TMA, Group PRF1-TMA ,and Group PRF2-TMA. Group IN (intact) and Group IN-TMA (intact but subjected to thermomechanical aging) served as control groups. In the other six groups, endodontic treatment was performed and standardized mesio-occluso-distal (MOD) cavities were prepared. In BF, PRF1, and PRF2, the cavities were restored with bulk-fill composite only, bulk-fill/Ribbond, and bulk-fill/additional Ribbond, respectively. In BF-TMA, PRF1-TMA, and PRF2-TMA, the teeth were subjected to thermomechanical aging after the restorations. All of the teeth were fractured on the universal testing machine. Fracture surfaces were analyzed with a stereomicroscope. Results. Control groups showed significantly higher fracture strengths than tested groups (P<0.05). No statistically significant difference was observed among the tested groups (P>0.05). Most of the favorable fractures were seen in PRF1, PRF2, and PRF2-TMA. Most of the unfavorable fractures were seen in BF-TMA. Conclusions. Although fiber insertion with different techniques did not increase the fracture strength of teeth restored with bulk-fill composites, it increased the favorable fracture modes. Thermomechanical aging did not change the fracture strength of the groups.

Fracture Strength of Ceramic Bracket Tie Wings Subjected to Force Direction

2007 ◽  
Vol 330-332 ◽  
pp. 1353-1356
Author(s):  
Kyoung Nam Kim ◽  
Sang Bae Lee ◽  
H.J. Kim ◽  
J.S. Choi ◽  
Kwang Mahn Kim ◽  
...  
Keyword(s):  
Fracture Strength ◽  
Testing Machine ◽  
Compressive Force ◽  
Test Device ◽  
Steel Cylinder ◽  
Paired Samples ◽  
Universal Testing ◽  
Significant Difference ◽  
Force Direction ◽  
Ceramic Bracket

In this study, the effects of bracket designs and force direction on fracture strength of alumina bracket were evaluated. Two differently designed alumina brackets (MISO, HT Co., Ltd., Seoul, Korea) were tested. Each bracket was bonded with orthodontic adhesive to stainless steel cylinder. Compressive force was applied to the tie wing of bracket at 30°, 60°, and 90° to the long axis of the test device. Fracture strengths were assessed by using a universal testing machine (Instron 3366, Instron Co., Ltd., U.S.A.). Fractured bracket surfaces were examined using SEM. Statistical analysis was performed by using SPSS 9.0 for Windows program. Paired samples t-tests and Kruskal-wallis tests were used at P<0.05. The fracture strength ranged from 150 N with the occlusal wing to 63 N with the cervical wing in bracket A. A significant difference was founded in fracture strength between the bracket designs and force directions. Based on this result, it could be concluded that bracket designs and force direction was important rule to improve fracture strength of ceramic bracket.

scholarly journals Effect of cpp-acp on the bond strength of silorane and methacrylate based restorative systems

2013 ◽  
Vol 1 (1) ◽  
pp. 64
Author(s):  
Bruno de Castro Ferreira Barreto ◽  
Anderson Catelan ◽  
Marina Baptista Aleixo ◽  
Gisele Rodrigues Silva ◽  
Tathy Aparecida Xavier ◽  
...  
Keyword(s):  
Bond Strength ◽  
Hybrid Composites ◽  
Resin Composite ◽  
Testing Machine ◽  
Adhesive Systems ◽  
Universal Testing ◽  
Significant Difference ◽  
S Matrix ◽  
Casein Phosphopeptide ◽  
Microshear Bond Strength

This study evaluated the influence of the previous application of casein phosphopeptide amorphous calcium phosphate (CPP-ACP) on the bond strength of two restorative systems to dentin. Self-etching adhesive systems Clearfil SE Bond (Kuraray) and FiltekTM LS System Adhesive (3M ESPE) were used in combination with two micro-hybrid composites FiltekTM Z250 (3M ESPE) and FiltekTM LS (3M ESPE), respectively. Twenty-eight sound human third molars had the occlusal surface worn until the total exposure of dentin and were randomly divided into 4 groups (n = 7): G1 (Clearfil + Z250), G2 (CPP-ACP + Clearfil + Z250), G3 (LS system) and G4 (CPP-ACP + LS system). The application of the paste containing CPP-ACP was held in the dentin of G2 and G4 prior to adhesive protocol, which followed the manufacturer's recommendations. Two cylinders of a single increment of resin composite were built on each dentin surface using tygon`s matrix with 1.26 mm of diameter x 1 mm high and light-cured with LED Bluephase 16i (Vivadent) apparatus. Microshear bond strength test was conducted in a universal testing machine (EZ Test, Shimadzu) with a speed of 0.5 mm/min. The data were subjected to two-way ANOVA test with a significance of 5%. There was no significant difference on bond strength between restorative systems with or without the previous use of a CPP-ACP paste. It was concluded that the application of CPP-ACP in the dentin prior to adhesive protocol did not influence the bond strength of the restorative systems tested.

scholarly journals Comparative Analysis of Fracture Strength of Remaining Tooth Structure after Endodontic Treatment with Various Access Cavity Preparation Techniques

2020 ◽  
Vol 14 (1) ◽  
pp. 681-686
Author(s):  
Mohammed Mustafa ◽  
Zaid A. AlJeaidi ◽  
Ali Robaian AlQahtani ◽  
Mohammed Ali Salem Abuelqomsan ◽  
Raneem Suleiman Alofi ◽  
...  
Keyword(s):  
Fracture Strength ◽  
Fracture Resistance ◽  
Statistical Tests ◽  
Testing Machine ◽  
Endodontic Treatment ◽  
Cavity Preparation ◽  
Endodontically Treated Teeth ◽  
Tooth Structure ◽  
Root Canals ◽  
Significant Difference

Background: A perfect balance needs to be maintained between various types of endodontic access cavity preparation designs like - Traditional and conservative designed preparation to have access to the root canal system for proper cleaning and shaping of root canals without compromising the fracture resistance of the tooth structure. Aims and Objectives: We aimed to assess as well as draw comparisons of resistance against fracture of remaining tooth structure post the endodontic treatment after preparing access cavity through a variety of techniques so that we can estimate which type of cavity design technique will help endodontically treated teeth to withstand excessive load without fracture. Methods: Forty-two intact teeth (mandibular molars) were randomly selected and then were assigned to 07 different groups, inclusive of control and test groups. Various designs of access cavity preparation were done on sample teeth. The groups were divided based on different access cavity preparation designs as well as residual walls. The samples were then mounted on a composite cylinder, which was loaded under a mechanical testing machine at 0.5mm/min speed till the tooth structure fractured. This measurement of force was denoted in newton. The later analysis was carried out with the help of two-way Analysis of Variance (ANOVA) as well as Tukey’s post-hoc statistical tests. Results: There was negligible statistically relevant variance in strength towards fracture between traditional and conservative designs in teeth having three remaining walls. However, teeth with only two remaining walls fractured easily. Conclusion: Fracture resistance of teeth with remaining 03 residual walls did not show any significant difference among Traditional (TEC) and Conservative Cavity (CEC) design groups, but increased fracture strength was reported in CEC with 02 residual walls.

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

2009 ◽  
Vol 03 (03) ◽  
pp. 173-177 ◽  
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)

scholarly journals Load-Application Devices: A Comparative Strain Gauge Analysis

2015 ◽  
Vol 26 (3) ◽  
pp. 258-262 ◽  
Author(s):  
Renato Sussumu Nishioka ◽  
Luis Gustavo Oliveira de Vasconcellos ◽  
Renata Pilli Jóias ◽  
Sigmar de Mello Rode
Keyword(s):  
Strain Gauge ◽  
Repeated Measures ◽  
Testing Machine ◽  
Acrylic Resin ◽  
Load Application ◽  
Chromium Alloy ◽  
Axial Loads ◽  
Nickel Chromium ◽  
Universal Testing ◽  
Significant Difference

In view of the low loading values commonly employed in dentistry, a load-application device (LAD) was developed as option to the universal testing machine (UTM), using strain gauge analysis. The aim of this study was to develop a load-application device (LAD) and compare the LAD with the UTM apparatus under axial and non-axial loads. An external hexagonal implant was inserted into a polyurethane block and one EsthetiCone abutment was connected to the implant. A plastic prosthetic cylinder was screwed onto the abutment and a conical pattern crown was fabricated using acrylic resin. An impression was made and ten identical standard acrylic resin patterns were obtained from the crown impression, which were cast in nickel-chromium alloy (n=10). Four strain gauges were bonded diametrically around the implant. The specimens were subjected to central (C) and lateral (L) axial loads of 30 kgf, on both devices: G1: LAD/C; G2: LAD/L; G3: UTM/C; G4: UTM/L. The data (με) were statistically analyzed by repeated measures ANOVA and Tukey's test (p<0.05). No statistically significant difference was found between the UTM and LAD devices, regardless of the type of load. It was concluded that the LAD is a reliable alternative, which induces microstrains to implants similar to those obtained with the UTM.

scholarly journals Effect Of Accelerating Aging On Retention And The Release Period Of Clips In A Bar Retained Maxillary Implant Overdenture

2021 ◽  
Vol 8 ◽  
Author(s):  
Dalia El naggar ◽  
Ahmed Mohamed Alam-Eldein ◽  
Maha Mostafa Halim ◽  
Hoda Mohammed Amin Rashad
Keyword(s):  
Testing Machine ◽  
Accelerated Aging ◽  
The Other ◽  
Universal Testing Machine ◽  
Universal Testing ◽  
Retention Loss ◽  
Significant Difference ◽  
Implant Overdenture

Objectives: This study was made to detect the effect of accelerating aging on retention and measuring the release period of clips in a 2 and 3 bar retained maxillary implant overdenture. Materials and Methods: Four implants were placed in two maxillary edentulous epoxy models. One model had two bar attachments with two clips overdenture while the other model had three bar attachments with three clips in the overdenture. Retention and release period of the clips were checked before applying insertion removal cycles. Retention was measured using universal testing machine after 540 cycles (6 months) and 1080 cycles (1 year) of insertion removal on a chewing simulator.Results and Conclusions: There was a significant difference in retention and release period between two bars and three bars implant retained maxillary overdentures. A significant difference was also seen in each group after accelerated aging. Therefore, the three bar implant retained overdenture had higher retention values than two bar. Retention loss occurred in both groups after the insertion removal cycles. Release period value was lower in two bar overdenture than three bar overdenture.

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