scholarly journals Efek Ketebalan Semen Ionomer Kaca dan Resin Komposit terhadap Kekuatan Tekan Tumpatan Sandwich

2016 ◽  
Vol 17 (1) ◽  
pp. 8
Author(s):  
Tunjung Nugraheni
Keyword(s):  
Testing Machine ◽  
Universal Testing Machine ◽  
Universal Testing

Tuntutan masyarakat terhadap tumpatan sewarna gigi semakin tinggi. Pada kasus-kasus tertentu teknik restorasi dengan menggunakan dua bahan restorasi yang berbeda (teknik tumpatan sandwich) diperlukan untuk mendapatkan restorasi yang dapat melekat kuat dan mempunyai estetika yang bagus. Teknik tumpatan sandwich yang sering dilakukan adalah menggunakan semen ionomer kaca dan resin komposit. Penelitian ini bertujuan untuk mengetahui efek perbedaan ketebalan semen ionomer kaca dan resin komposit terhadap kekuatan tekan tumpatan sandwich secara in vitro. Pada penelitian ini digunakan 40 subjek penelitian berupa tumpatan sandwich yang dibuat pada cetakan fiber dengan kavitas berbentuk sHinder dengan diameter 5 mm dan tinggi 5 mm. Semua kavitas ditumpat dengan semen ionomer kaca dan resin komposit dengan teknik sandwich, dengan perbandingan ketebalan yang berbeda. Kelompok I dilakukan penumpatan semen ionomer kaca tipe II dan resin komposit packable dengan perbandingan 1:4, kelompok II dengan perbandingan 2:3, kelompok III dengan perbandingan 3:2, kelompok IV dengan perbandingan 4:1. Selanjutnya seluruh subjek penelitian direndam dalam saliva tiruan pH 6,7 dan disimpan pada suhu 370C selama 24 jam dalam inkubator, kemudian diukur kekuatan tekan menggunakan alat uji tekan Universal Testing Machine. Hasil analisis dengan Anava satu jalur menunjukkan perbedaan ketebalan semen ionomer kaca dan resin komposit mempunyai efek yang bermakna terhadap kekuatan tekan tumpatan sandwich (p < 0,05). Hasil uji LSD rerata kekuatan tekan antar kelompok 1,11,III dan IV berbeda bermakna (p < 0,05), dapat disimpulkan bahwa perbedaan ketebalan semen ionomer kaca dan resin komposit berpengaruh terhadap kekuatan tekan tumpatan sandwich.

scholarly journals Pengaruh Kloroform Terhadap Pelarutan Bahan Perekat Yang Menempel Pada Braket Keramik Yang Lepas Dari Gigi

2021 ◽  
Vol 6 (1) ◽  
pp. 9-18
Author(s):  
Ken Edinata ◽  
Endah Mardiati
Keyword(s):  
Shear Strength ◽  
Orthodontic Treatment ◽  
Testing Machine ◽  
Wilcoxon Test ◽  
Comparative Approach ◽  
Universal Testing Machine ◽  
Universal Testing ◽  
Ceramic Brackets ◽  
Ceramic Bracket

ABSTRAK Kebutuhan braket transparan pada perawatan ortodonti semakin berkembang dengan adanya kebutuhan braket sewarna gigi, terutama wanita yang memerlukan penampilan estetik maksimal. Braket yang lepas dalam perawatan ortodonti perlu direkatkan kembali. Pembersihan landasan braket yang terlepas sehingga dapat direkatkan kembali akan mengurangi biaya yang harus dikeluarkan pasien. Melakukan daur ulang braket haruslah dapatdapat dilakukan tanpa merubah sifat fisik dan ukuran dari braket tersebut. Penelitian ini adalah penelitian eksperimental analitik laboratoris in vitro dengan pendekatan komparatif yang bertujuan untuk melihat perbedaan kuat rekat geser braket keramik yang dibersihkan dengan kloroform selama 20 menit, 40 menit, 60 menit. Sampel yang digunakan dalam penelitian ini adalah 60 buah braket keramik monokristalin  merek Ice Inspire dari Ormco dengan perlekatan mekanik. Pengukuran uji rekat geser menggunakan Instron Universal Testing Machine dan sisa resin menggunakan skor ARI. Analisis statistik dilakukan dengan uji Wilcoxon dan ANOVA. Hasil penelitian menunjukkan terdapat perbedaan bermakna kuat rekat geser braket keramik pasca rekat yang dibersihkan dengan kloroform selama 20 menit, 40 menit, 60 menit dan braket keramik pascarekat yang baru. Simpulan dari penelitian ini bahwa Terdapat perbedaan kuat rekat geser braket keramik yang dibersihkan dengan kloroform selama 20 menit, 40 menit, 60 menit dengan braket keramik yang baru, Semakin lama waktu pembersihan braket keramik dengan kloroform, sisa resin adhesif akan semakin bersih dan mempunyai kuat rekat geser yang lebih tinggi. Terdapat perbedaan sisa resin adesif antara braket keramik pasca rekat yang dibersihkan dengan kloroform yang dilepas kembali dengan braket keramik pasca rekat yang baru.   Kata Kunci : perbedaan kuat rekat geser, kloroform, kuat rekat geser, ARI, braket keramik.                                                                                                    ABSTRACT Transparant bracket needs in orthodontic treatment is become huge caused the needs of tranlucent bracket , especially women who require maximum aesthetic appearance. Debonding bracket in orthodontic treatment need  to reattached.  By Cleaning mesh of bracket so it can be reattached to reduce patient costs . Recycling bracket must can done without changing the physical properties and the size of bracket. This study is an experimental study in vitro analytical comparative approach that aims to see the difference shear strength adhesion to ceramic brackets were cleaned with chloroform for 20 minutes , 40 minutes , 60 minutes . The sample used in this study were 60 pieces of ceramic bracket monokristalin from Ormco Inspire Ice with mechanical retention. Measurement of shear strength test using the Instron Universal Testing Machine and the rest of the resin using ARI scores . Statistical analysis was used  with Wilcoxon test and ANOVA . The results showed there were significant differences in the bracket shear strength rebonding ceramic bracket, which cleaned with chloroform for 20 minutes , 40 minutes , 60 minutes and new rebonding ceramic bracket. Conclusions from this research that There is a difference in the shear strength ceramic brackets  which cleaned using chloroform for 20 minutes , 40 minutes , 60 minutes and with a new ceramic bracket , the longer time cleaning ceramic bracket with chloroform, the rest of the adhesive resin will be clean and have strong adhesion higher shear. There are differences between the residual resin adhesive after adhesive ceramic bracket cleaned with chloroform is released back and the ceramic new bracket rebonding. Key words : 

scholarly journals Retention of Cast Posts Cemented with Two Commonly Used Conventional and Two Resin Cements and the Mode of Root Fracture Following Their Removal

2021 ◽  
Author(s):  
Azadeh Hesarkhani ◽  
Farnoush Fotovat ◽  
Fatemeh Saneian ◽  
Hosein Akbari ◽  
Hanif Allahbakhshi
Keyword(s):  
Zinc Phosphate ◽  
Testing Machine ◽  
Resin Cement ◽  
Endodontically Treated Teeth ◽  
Root Fracture ◽  
Universal Testing Machine ◽  
Pull Out ◽  
Universal Testing ◽  
Significant Difference

Objectives: This study aimed to compare the retention of cast posts cemented with four types of cements and assess the mode of root fracture following their removal. Materials and Methods: In this in vitro, experimental study, 48 upper central incisors were randomly divided into 4 groups of 12, and were endodontically treated. The fabricated cast posts in each group were cemented with zinc phosphate (Masterdent), glass ionomer (GI; Meron), Meta resin cement, and Panavia SA resin cement. A device was customized for post removal by a universal testing machine similar to WAM X pliers. The retention of cemented posts was measured by the pull-out test in a universal testing machine. Next, the teeth were macroscopically and microscopically inspected regarding the occurrence and sites of catastrophic fracture, cracks, or craze lines. Quantitative and qualitative data were analyzed by ANOVA, and Chi-square test, respectively (P<0.05). Results: ANOVA showed a significant difference in the mean retention of cements (P<0.001). Panavia provided the highest retention (278.6±34.9 N) followed by zinc phosphate (221.9±28.88 N), GI (161.3±60.7 N), and Meta (140.4±66.54 N). There was no significant difference between the groups regarding the pattern of root fracture (P=0.39). However, site and extent of fractures were significantly different among the groups (P<0.05). Conclusion: The conventional cements provided optimal retention and caused less root damage after post removal. Thus, cements providing adequate retention and allowing easier post removal are recommended for use in endodontically treated teeth with a possibility of requiring retreatment.

scholarly journals Fracture strength of teeth restored with milled ultrathin occlusal veneers made of polymer-infiltrated ceramic

2021 ◽  
Vol 32 (5) ◽  
pp. 105-113
Author(s):  
Laerte Ohse ◽  
Deborah Stona ◽  
Marília M. Sly ◽  
Luiz Henrique Burnett Júnior ◽  
Ana Maria Spohr
Keyword(s):  
Fracture Strength ◽  
Testing Machine ◽  
Strength Test ◽  
The Other ◽  
Single Bond ◽  
Third Molars ◽  
Universal Testing Machine ◽  
Universal Testing

Abstract The purpose was to evaluate, in vitro, the fracture strength of teeth restored with 0.3- or 0.6-mm-thick occlusal veneers made of Vita Enamic® bonded to enamel or dentin. Fifty third molars were allocated into five groups (n=10): Group C - control (sound teeth); Group 0.3E - 0.3-mm-thick occlusal veneers bonded to enamel; Group 0.6E - 0.6-mm-thick occlusal veneers bonded to enamel; Group 0.3D - 0.3-mm-thick occlusal veneers bonded to dentin; Group 0.6D - 0.6-mm-thick occlusal veneers bonded to dentin. After luting with Single Bond Universal and Filtek Z-100, the samples were subjected to fracture strength test in a universal testing machine. The fractures were classified as irreparable and reparable. Data were analyzed with 2-way and 1-way ANOVA (α=.05) followed by Tukey’s test. The teeth restored with 0.3-mm-thick occlusal veneers (2658 N) achieved significantly higher fracture strength compared to the teeth restored with 0.6-mm-thick occlusal veneers (2070 N) (p=0.017). The teeth restored with occlusal veneers bonded to enamel (2648 N) had significantly higher fracture strength compared to the teeth restored with occlusal veneers bonded to dentin (2049 N) (p=0.015). Group C (3355 N) and Group 0.3E (2965 N) did not differ significantly from each other, being the fracture strength significantly higher than the other groups (p<0.05). The fractures were predominantly reparable. The teeth restored with 0.3-mm-thick occlusal veneers achieved higher fracture strength compared to the teeth restored with 0.6-mm-thick occlusal veneers. The supporting substrate influenced the fracture strength, which was higher for the teeth restored with occlusal veneers bonded to enamel.

scholarly journals COMPARATIVE EVALUATION OF TENSILE BOND STRENGTH OF ENDODONTIC SEALERS TO DENTIN AND GUTTA PERCHA - AN IN-VITRO STUDY

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Omkar Eswara Babu Danda ◽  
Lakshman Kumar CH ◽  
Afroz Kalmee Syed ◽  
Dasarathi A ◽  
Haranath Danda
Keyword(s):  
Tensile Strength ◽  
Bond Strength ◽  
Testing Machine ◽  
Tensile Bond Strength ◽  
Universal Testing Machine ◽  
Gutta Percha ◽  
Universal Testing ◽  
Ah Plus ◽  
Endodontic Sealers

Introduction: The root canal therapy is done with the intention to seal it off from any fluid leaks, thus enhancing the longevity of the therapy. The seal between the obturating material and the dentinal walls of the root surface is done by the endodontic sealer. The sealer is designed in such a way that it has to mould itself with the curves and follow the shapes of the root dentinal wall. Aims: To compare in-vitro the tensile bond strength of four different endodontic sealers to root dentin and Gutterpercha. Methods: Thirty six single ‑ rooted canine and premolar teeth with total apical formation were selected. Working length was determined after the crown portion was cut. BMP was done. Teeth were grouped as Group Ⅰ: MTA‑ based sealer, Group Ⅱ: Bioceramic Sealer, Group Ⅲ: Calcium based sealer, Group Ⅳ: Epoxy resin based (AH Plus sealer). Sealers were manipulated according to the manufacturer protocol. Obtuartion was done using 4% gutta ‑ percha. Later tensile strength test was done on the root slices of 2 mm thickness using universal testing machine. 6 mm in diameter Aluminum cylinders, were stabilized on the gutta–percha with small amounts of wax and were filled with one of the sealers. After setting each sealer, the drops of wax were removed and the tensile bond strengths of all the samples were measured using universal testing machine. The data was analysed using Tukey tests and ANOVA. Results: Among the 4 groups highest bond strength was found in Group Ⅱ (BioRootTMRCS) (P < 0.05) and the least was Group Ⅰ (MTA Fill apex). Conclusion: Bioceramic sealer’s tensile bond strength was highest followed by AH26, Sealapex and MTA‑ based sealer. Keywords: Bond strength; BioRoot TMRCS Sealer; MTA Fill apex; AH Plus Sealer, Sealapex, tensile strength.

scholarly journals Effect of Interimplant Distance and Cyclic Loading on the Retention of Overdenture Attachments

2017 ◽  
Vol 18 (11) ◽  
pp. 1078-1084 ◽  
Author(s):  
Seyed S Shayegh ◽  
Seyed MR Hakimaneh ◽  
Mohammad T Baghani ◽  
Shireen Shidfar ◽  
Farinaz K Kashi ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Clinical Significance ◽  
Analysis Of Variance ◽  
Significant Role ◽  
Testing Machine ◽  
Acrylic Resin ◽  
Universal Testing Machine ◽  
Universal Testing ◽  
System P

ABSTRACT Aim The purpose of this in vitro study was to investigate the effect of interimplant distance and cyclic loading on the retention of two locator attachment systems. Materials and methods A total of 72 acrylic resin blocks were fabricated and divided into six groups of six pairs each. Locators of DIO and 3i implant systems were positioned on analogs in three different interimplant distances (19, 23, and 29 mm). The blocks were attached to a universal testing machine, and 1,440 dislodging cycles by the force of 136 N were applied. After 0, 120, 360, 720, and 1,440 cycles, the retention was recorded. Three-way analysis of variance (ANOVA) was used to test for differences in retention between the various combinations of the locator, interimplant distance, and cyclic loadings. Results Interimplant distance was significantly associated with retention, independent of the locator system used, and dislodgement force cycles. Mean retention was significantly higher under the 3i system relative to the DIO system (p < 0.0001). This association varied with both interimplant distance (p > 0.0001) and dislodgement force (p < 0.0001) as well as across the various combinations of distance and cycle (p < 0.0001). Conclusion Interimplant distances could affect the initial retention of locator attachments. There was little difference in retention between distances of 23 and 29 mm across all cycles when both locator systems were combined. Distance of 23mm was associated with superior retention in the DIO system. With regard to the speed of retention decrease, the 23 mm distance was associated with better performance. Clinical significance Interimplant distance could play a significant role in overdenture retention with locator attachments. How to cite this article Shayegh SS, Hakimaneh SMR, Baghani MT, Shidfar S, Kashi FK, Zamanian A, Arezoobakhsh A. Effect of Interimplant Distance and Cyclic Loading on the Retention of Overdenture Attachments. J Contemp Dent Pract 2017;18(11):1078-1084.

Study on Characteristics of Ultrasonic Velocity for the Concrete under Stress

2013 ◽  
Vol 438-439 ◽  
pp. 220-223 ◽  
Author(s):  
Ling Zhang ◽  
Chun Ling Yan
Keyword(s):  
Ultimate Strength ◽  
Ultrasonic Velocity ◽  
Ultrasound Examination ◽  
Testing Machine ◽  
Strength Level ◽  
Growth Trend ◽  
Universal Testing Machine ◽  
Universal Testing ◽  
Three Stages ◽  
The Relationship

Cube concrete (150×150×150mm) of five ages (7, 14, 21, 28 and 35 days) under different stress conducted the ultrasound examination by non-metallic detector and universal testing machine. The results show that the relationship curve of the stress and the ultrasonic velocity can be divided into three stages, the smooth straight stage, the linear deceleration stage and the attenuation destruction stage from the load beginning to the ultimate strength for the same age. There is a growing trend about the ultrasonic velocity with the increase of the age to concrete samples of C10 and C20 in the same loading; however, the overall growth trend of the velocity is not obvious to concrete samples of C30, C35, C40 and C45. It also shows that the relationship curve of strength level and the velocity can be divided into two distinct stages, the sharply increasing stage (C10-C30) and the fluctuating stage (C30-C45). Simultaneously, the paper further illustrates and explains the reasons to appear these stages and the phenomena.

Comparison of characteristic of iron (Fe) powder using underground explosive pressing and universal testing machine

2018 ◽  
Author(s):  
Rafika Norhidayu Rosdi ◽  
Nor Azmaliana Azmi ◽  
Nurain Abdul Latheef ◽  
Ahmad Humaizi Hilmi ◽  
Arifin Ismail ◽  
...  
Keyword(s):  
Testing Machine ◽  
Universal Testing Machine ◽  
Universal Testing ◽  
Fe Powder ◽  
Explosive Pressing

scholarly journals Shear Bond Strength of Different Adhesive Materials used for Bonding Orthodontic Brackets : A Comparative in vitro Study

2015 ◽  
Vol 5 (1) ◽  
pp. 22-26
Author(s):  
Muzin Shahi Shaik ◽  
Snigdha Pattanaik ◽  
Sudhakar Pathuri ◽  
Arunachalam Sivakumar
Keyword(s):  
Bond Strength ◽  
Treatment Duration ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Test Group ◽  
In Vitro Study ◽  
Universal Testing ◽  
Materials Used ◽  
Adhesive Materials

Introduction: Bond strength is an important property and determines the amount of force delivered and treatment duration in orthodontics. Many light-cured bonding materials are being used; but it is required to determine the most efficient one withdesired bond strength. Objective: To determine and compare the shear bond strength of three visible light-cured composites (Transbond XT, Heliositand Enlight) and two self-cured composites (Rely-a-bond and Concise). Materials & Method: 100 extracted premolars were collected and randomly divided into 5 test groups of different adhesives. Brackets were bonded to the teeth in each test group with the respective adhesive according to the manufacturer’s instructions. Each specimen was debonded using Universal Testing Machine and the shear bond strength for each specimen was calculated. All the groups were compared by ANOVA one-way test. Results: There were statistically significant differences among the five groups (P<0.05). The shear bond strength of Enlight (13.92 ± 3.92) is similar to Transbond XT (14.30 ± 4.35). Conclusion: Light cure composites showed higher bond strength than self cure composites.

scholarly journals Flexibility of K3 and ProTaper universal instruments

2011 ◽  
Vol 22 (3) ◽  
pp. 218-222 ◽  
Author(s):  
Renata Grazziotin-Soares ◽  
Flares Barato Filho ◽  
José Roberto Vanni ◽  
Susimara Almeida ◽  
Elias Pandonor Motcy de Oliveira ◽  
...  
Keyword(s):  
Mechanical Test ◽  
Testing Machine ◽  
Universal System ◽  
Universal Testing Machine ◽  
The Third ◽  
Universal Testing ◽  
Before And After ◽  
Level Of Significance ◽  
Flexible Instruments

This study used a mechanical test to evaluate the flexibility of instruments from the K3 (conicity 0.04) and the ProTaper Universal systems when they were new and after 5 uses in simulated canals. Five sets of instruments of each system were tested: K3 (15, 20, 25, 30, 35, 40 and 45) and ProTaper Universal (S1, S2, F1, F2, F3, F4 and F5). Each set of instruments was used to prepare a simulated canal and the same set of instruments was used 5 times (50 canals). The number of each subgroup represented the number of uses: 0 (control), 1, 3 and 5 uses. Before and after each use, the instruments were submitted to a mechanical flexibility test performed in a Versat 502 universal testing machine. Interactions between the instrument and the number of uses were analyzed by ANOVA and Tukey's test at a 5% level of significance. Instruments from both systems presented lower flexibility after the third use compared to the flexibility obtained after uses 0 and 1 (p<0.05), and maintained the same flexibility after the fifth use. The flexibility of instruments from the K3 system decreased with the increase of diameter, irrespective of the number of uses. Among the instruments from the ProTaper Universal system, the shaping files presented greater flexibility than the finishing files. F2 and F3 were the least flexible instruments, and F4 and F5 presented flexibility values similar to those of F1.

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