scholarly journals Kekuatan ikat geser gigi artifisial akrilik dan porselen pada tiga macam basis gigi tiruan nilon termoplastikThe shear bond strength of acrylic and porcelain teeth in three types of thermoplastic nylon denture bases

2019 ◽  
Vol 31 (1) ◽  
Author(s):  
Miftahussakinah Rizani ◽  
Hubban Nasution
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Base Material ◽  
Central Incisor ◽  
Denture Base ◽  
Maxillary Central Incisor ◽  
Universal Testing Machine ◽  
Universal Testing ◽  
Artificial Teeth

Pendahuluan: Kekuatan ikat geser adalah kekuatan maksimum suatu material untuk menahan atau menerima gaya geser hingga lepas atau terjadinya fraktur. Ini merupakan salah satu hal yang penting dalam penggunaan gigi tiruan, terutama pada gigi tiruan sebagian lepasan dengan bahan basis nilon termoplastik. Kekurangan bahan basis ini adalah sering terlepasnya gigi artifisial dari basis gigi tiruannya. Tujuan penelitian ini adalah untuk mengetahui perbedaan kekuatan ikat geser antara gigi artifisial akrilik maupun porselen dengan bahan basis gigi tiruan nilon termoplastik Valplast™, TCS™ dan Biotone™.  Metode: Jenis penelitian ini adalah eksperimental laboratoris. Sampel yang digunakan pada penelitian ini terdiri dari 18 gigi artifisial insisivus sentralis rahang atas akrilik dan 18 gigi artifisial insisivus sentralis rahang atas porselen yang dibagi ke dalam 6 kelompok. Tiap sampel ditanamkan pada bahan basis gigi tiruan berbentuk silindris dengan diameter 18 mm dan tinggi 20 mm. Sampel di uji dengan menggunakan alat Universal Testing Machine. Data dianalisis dengan menggunakan uji ANOVA satu arah. Hasil: Terdapat perbedaan kekuatan ikat geser yang signifikan (p<0,05). Pada kedua gigi artifisial kelompok dengan basis Valplast™ memiliki nilai kekuatan ikat geser tertinggi, lalu diikuti dengan kelompok TCS™ dan Biotone™. Simpulan: Nilai kekuatan ikat geser berbeda pada gigi artifisial akrilik maupun porselen pada tiga macam basis gigi tiruan nilon termoplastik.Kata kunci: Kekuatan ikat geser, nilon termoplastik, gigi artifisial akrilik, gigi artifisial porselen. ABSTRACTIntroduction: Shear bond strength is the maximum strength of a material to hold or accept shear forces until detached or fractured. This strength is one of the essential things in the denture usage, especially in removable partial denture with nylon thermoplastic base material. The disadvantage of this material base is the frequent detachment of artificial teeth from the denture base. The purpose of this study was to determine the difference of the shear bond strength between acrylic and porcelain teeth with thermoplastic nylon denture base material of Valplast™, TCS™, and Biotone™. Methods: The type of research was an experimental laboratory. The sample used in this study consisted of 18 acrylic maxillary central incisor artificial teeth and 18 porcelain maxillary central incisor artificial teeth divided into 6 groups. Each sample was implanted in cylindrical denture base material with a diameter of 18 mm and a height of 20 mm. The sample was tested using a Universal Testing Machine. Data were analysed using a one-way ANOVA test. Result: There were significant differences in the shear bond strength (p < 0.05) in both artificial teeth, with the group of Valplast™ base had the highest shear bond strength value, followed by the TCS™ and Biotone™ groups. Conclusion: The shear bond strength values of acrylic and porcelain teeth in three types of thermoplastic nylon denture bases were significantly different.Keywords: Shear bond strength, thermoplastic nylon, acrylic teeth, porcelain teeth.

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 Effect of Thermocycling, Teeth, and Polymerization Methods on Bond Strength Teeth-Denture Base

2018 ◽  
Vol 2018 ◽  
pp. 1-5 ◽  
Author(s):  
Sandra Lúcia Andrade de Freitas ◽  
William Cunha Brandt ◽  
Milton Edson Miranda ◽  
Rafael Pino Vitti
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Acrylic Resin ◽  
Water Bath ◽  
Microwave Method ◽  
Denture Base ◽  
Mean Values ◽  
Acrylic Resins ◽  
Artificial Teeth

Objective. To evaluate the shear bond strength between different artificial teeth and denture base polymerized by two polymerization methods submitted to thermocycling. Materials and Methods. Two acrylic resins were selected according to the polymerization method (water-bath and microwave), and four different artificial teeth (Biotone, Dentsply; Trilux, Vipi Dent; Premium 8, Heraeus Kulzer; Soluut PX, Yamahachi) were also tested. The polymerization of the acrylic resin was performed by using conventional cycle (8 h at 74°C) in water-bath and using two cycles (20 min at 270 W + 5 min at 360 W) by the microwave method. The shear bond strength was evaluated after 24 h of water storage at 37°C (immediately) and after the thermocycling test (5,000 cycles, 5–55°C). The shear bond strength (n=10) was performed using a universal testing machine (Instron 4411) at a crosshead speed of 1.0 mm/min. Modes of failures were classified as cohesive and adhesive. The data (MPa) were statistically analyzed by three-way ANOVA, and the mean values were compared by the Tukey test (α = 0.05). Results. In general, the polymerization by microwave showed the highest shear bond strength values, and Trilux artificial teeth had the lowest bond strength values (p<0.05). Thermocycling did not affect the shear bond strength (p<0.05). There was a predominance of cohesive failures for all groups. Conclusions. The chemical composition of the artificial teeth affects the bond strength, and the microwave method is preferable to perform the acrylic resin polymerization.

scholarly journals Pengaruh Konsentrasi dan Lama Aplikasi Sodium Hipoklorit (NaOCL) sebagai Bahan Irigasi Saluran Akar terhadap Kekuatan Geser Perlekatan Siler Berbahan Dasar Resin Pada Dentin Saluran Akar

2012 ◽  
Vol 19 (1) ◽  
pp. 21
Author(s):  
Tunjung Nugraheni
Keyword(s):  
Bond Strength ◽  
Sodium Hypochlorite ◽  
Root Canal ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Universal Testing Machine ◽  
Root Canal Irrigation ◽  
Universal Testing ◽  
Group I ◽  
Root Canal Dentin

Latar belakang. Salah satu tahap penting perawatan saluran akar yaitu preparasi saluran akar. Pada preparasi saluran akar digunakan bahan Irigasi sodium hipoklorit (NaOCI), dengan konsentrasi 0,5%-5.25%. Penggunaan NaOCL berpengaruh pada struktur permukaan dentin saluran akar, yang selanjutnya mempengaruhi perlekatan dentin saluran akar dengan bahan pengisi saluran akar. Penelitian ini bertujuan untuk mengetahui pengaruh konsentrasi dan lama aplikasi NaOCI terhadap kekuatan geser perlekatan siler berbahan dasar resin pada dentin saluran akar. Metode Penelitian. Tiga puluh gigi premolar dipotong arah bukolingual, jaringan pulpa dibersihkan dan permukaan dentin saluran akar diratakan. Gigi difiksasi resin akrilik, sisi dentin saluran akar menghadap ke atas. Sampel dibagi menjadi 2 kelompok masing-masing 15 gigi, kelompok 1 di rendam dalam 6ml NaOCI 2,5%. Kelompok II direndam dalam 6 ml NaOCI 5%. Kelompok I dan II dibagi menjadi 3 sub kelompok lama perendaman, yaitu sub kelompok a direndam selama 5 menit, sub kelompok diremdam selama 10 menit, sub kelompok direndam selama 15 menit. Cetakan siler difiksasi pada akar gigi, dilakukan insersi siler ke dalam cetakan kemudian dimasukkan inkubaror pada suhu 370 C selama 72 jam. Pengujian kekuatan geser perlekatan menggunakan Universal Testing Machine. Hasil penelitian. Hasil uji statistik AVANA dua jalur menunjukkan kekuatan geser perlekatan siler berbahan dasar resin pada dentin saluran akar setelah diirigasi dengan konsentrasi NaOCI dan lama irigasi yang berbeda terdapat perbedaan yang bermakna (p=0,007). Uji LSD menunjukkan bahwa kekuatan geser perlekatan siler berbahan dasar resin berbeda bermakna pada kelompok yang diirigasi NaOCI 2,5% selama 5 menit dengan 15 menit,, pada kelompok yang diirigasi NaOCI 2,5% selama 10 menit dengan 15 menit, pada kelompok yang diirigasi NaOCI 5% selama 15 menit dengan kelompok yang diirigasi NaOCI 2,5% selama 15 menit serta pada kelompok yang diirigasi NaOCI 5% selama 5 menit dengan kelompok yang diirigasi NaOCI 5% selama 10 menit. Kesimpulan. Kekuatan geser perlekatan siler berbahan dasar resin pada dentin saluran akar berbeda setelah diirigasi NaOCI dengan konsentrasi dan waktu irigasi yang berbeda. Background. Biomechanichal preparationin of root canal treatment used 0,5-5,25% sodium Hypochlorite as root canal irrigation, that may effect to physical properties of dentin. The purpose of this study was to find out the effect of concentration and duration application of sodium hypochlorite to shear bond strength of sealer resin based to root canal dentin. Methods. Thirthy premolar were splitted buccolingual then pulp tissue were cleaned out, smoothed and fixed into acrylic resin cast. They were devided into 2 group, group I were soaking into NaOCI 2,5% group II were soaking into NaOCI 5%. Group I and II were devided into 3 subgroup, group a were soaking 5 minutes, group b were soaking 10 minutes. Group c were soaking 15 minutes. Then sealer cast were fixed and filled with sealer resin-based, and incubated for 74 hours. They were tested for shear bond strength with Universal Testing Machine. The data were analyzed with two way Anava and LSD. Result. Two way Avana show that shear bond strength of sealer resin-based to root canal after irrigation with different concentration and duration application of sodium hypochlorite are significant. Conclusion. Shear bond strength of sealer resin-based to root canal dentin after irrigation with different concentration and duration application of sodium hypochlorite are different.

scholarly journals The Influence of No-Primer Adhesives and Anchor Pylons Bracket Bases on Shear Bond Strength of Orthodontic Brackets

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Andrea Scribante ◽  
Maria Francesca Sfondrini ◽  
Danilo Fraticelli ◽  
Paola Daina ◽  
Alessandra Tamagnone ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Bond Strength ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Orthodontic Brackets ◽  
Universal Testing Machine ◽  
Universal Testing ◽  
Adhesive Remnant Index ◽  
Chi Squared ◽  
Mandibular Incisors

Objective. The aim of this study was to compare the shear bond strength (SBS) and adhesive remnant index (ARI) scores of no-primer adhesives tested with two different bracket bases.Materials and Methods. 120 bovine permanent mandibular incisors were divided into 6 groups of 20 specimens. Two brackets (ODP) with different bracket bases (anchor pylons and 80-gauge mesh) were bonded to the teeth using a conventional adhesive (Transbond XT) and two different no-primer adhesive (Ortho Cem; Heliosit) systems. Groups were tested using an instron universal testing machine. SBS values were recorded. ARI scores were measured. SEM microphotographs were taken to evaluate the pattern of bracket bases. Statistical analysis was performed. ANOVA and Tukey tests were carried out for SBS values, whereas a chi-squared test was applied for ARI scores.Results. Highest bond strength values were reported with Transbond XT (with both pad designs), Ortho Cem bonded on anchor pylons and Heliosit on 80-gauge mesh. A higher frequency of ARI score of “3” was reported for Transbond XT groups. Other groups showed a higher frequency of ARI score “2” and “1.”Conclusion. Transbond XT showed the highest shear bond strength values with both pad designs.

scholarly journals Pengaruh bahan desensitasi pasca bleaching ekstrakoronal terhadap kekuatan geser pelekatan restorasi resin komposit

2017 ◽  
Vol 2 (1) ◽  
pp. 35
Author(s):  
Ema Mulyawati
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Composite Resin ◽  
Artificial Saliva ◽  
Testing Machine ◽  
Group Iii ◽  
Universal Testing Machine ◽  
Universal Testing ◽  
Group I ◽  
Significant Difference

The Effect of desensitizing agent in post-extracoronal bleaching on shear bond strength of composite resin. The dentinal hypersensitivity is a common condition among patients after extracoronal bleaching treatment that usually needs the application of desensitizing agent. The purpose of this study was to evaluate the composite resin restoration shear bond strength with and without desensitizing application after extracoronal bleaching using 40% of H2O2. Twenty one extracted permanent human incisor teeth were randomly divided into 3 groups of 7 each. Group I was with the application of 40% H2O2 without any desensitizing agent. Group II was with the application of 40% of H2O2 with desensitizing agent and group III served as the control. The teeth were immersed in artificial saliva and stored in 37 °C incubator for 7 days. The teeth were restored using composite resin. After restoring the shear bond strength of composite resin was tested using a universal testing machine. Result and conclusion. there is no significant difference between bleaching group with and without desensitizing agent. The application of desensitizing agent after extracoronal bleaching did not impact the composite resin shear bond strength.ABSTRAKDentin hipersensitif merupakan kondisi yang biasa dialami pasien setelah perawatan bleaching ekstrakoronal yang biasanya memerlukan aplikasi bahan desensitasi. Penelitian ini bertujuan untuk mengetahui pengaruh bahan desensitasi pasca bleaching ekstrakoronal menggunakan H2O2 40% terhadap kekutan geser pelekatan restorasi resin komposit. Dua puluh satu gigi permanen insisivus yang telah dicabut dibagi dalam tiga kelompok masing-masing 7 gigi. Kelompok I dilakukan bleaching ekstrakoronal dengan H2O2 tanpa bahan desensitasi. Kelompok II dilakukan bleaching setelah itu diaplikasikan bahan desensitasi dan kelompok III sebagai kelompok kontrol. Semua gigi-gigi tersebut di rendam dalam saliva buatan dan dimasukkan inkubator selama 7 hari pada suhu 37 °C. Selanjutnya seluruh gigi dilakukan restorasi resin komposit menggunakan light cure halogen. Setelah itu dilakukan pengujian kekuatan geser pelekatan menggunakan universal testing machine. Data dianalisis menggunakan uji Kruskal - Wallis. Hasil penelitian menunjukkan bahwa tidak ada perbedaan kekuatan geser pelekatan pada semua kelompok perlakuan (p > 0,05). Dari penelitian ini disimpulkan bahwa tidak terdapat pengaruh aplikasi bahan desensitasi pasca bleaching ekstrakoronal terhadap kekuatan geser pelekatan restorasi resin komposit.

Comparative Evaluation of Shear Compressive Bond Strength between Cross-linked Acrylic Resin Denture Base and Cross-linked Acrylic Resin Teeth with Different Modifications of Their Ridge Lap Surfaces

2013 ◽  
Vol 14 (5) ◽  
pp. 898-903
Author(s):  
Prasad Rane ◽  
Leena Sadar ◽  
Swaroop Dhume ◽  
Neena Maniar ◽  
Jeevan Prakash Patil ◽  
...  
Keyword(s):  
Bond Strength ◽  
Comparative Evaluation ◽  
Testing Machine ◽  
Base Material ◽  
Slight Modification ◽  
Acrylic Resin ◽  
Denture Base ◽  
Anterior Teeth ◽  
The One ◽  
Artificial Teeth

ABSTRACT A major problem commonly observed in denture wearer is the detachment of artificial tooth/teeth from acrylic denture base. The problem was grave when porcelain teeth used along with the then available denture base materials. The bond formed was purely mechanical and hence debonding of teeth from denture base was a frequent occurrence. Inspite of chemical union between acrylic resin teeth and acrylic denture base material, detachment of teeth particularly anterior teeth is a frequent observation. The objective of the study is to study the effect of change in the surface treatment and surface configuration of ridge lap surface of the teeth on retention of cross-linked acrylic teeth on crosslinked acrylic resin denture base. Sixty specimens were tested for the shear compressive bond strength using instron universal testing machine in KN. Statistical analysis is used. The findings were analyzed using one-way analysis of variance (ANOVA) and ‘t’ test. Slight modification in the ridge lap surface of artificial teeth alters the strength of the shear compressive bond. Sand papering of ridge lap surfaces improves the shear compressive bond then the one without any modification. Maximum shear compressive bond strength can be increased by application of monomer How to cite this article Sadar L, Dhume S, Maniar N, Patil JP, Rane P, Gandhewar M. Comparative Evaluation of Shear Compressive Bond Strength between Cross-linked Acrylic Resin Denture Base and Cross-linked Acrylic Resin Teeth with Different Modifications of Their Ridge Lap Surfaces. J Contemp Dent Pract 2013;14(5):898-903.

scholarly journals Pengaruh penambahan aluminium oksida terhadap kekuatan tarik dan tekan basis gigi tiruan resin akrilik polimerisasi panasThe effect of addition of aluminium oxide on the tensile and compressive strength of a heat-polymerised acrylic resin denture base

2018 ◽  
Vol 30 (3) ◽  
pp. 189
Author(s):  
Actara Rahmadita ◽  
Dwi Tjahyaning Putranti
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Testing Machine ◽  
Base Material ◽  
Aluminium Oxide ◽  
Acrylic Resin ◽  
Strength Test ◽  
Denture Base ◽  
Universal Testing Machine ◽  
Universal Testing

Pendahuluan: Resin akrilik polimerisasi panas (RAPP) merupakan bahan basis gigi tiruan yang paling banyak digunakan, namun memiliki sifat kekuatan tarik dan tekan yang rendah, sehingga diperlukan modifikasi dengan penambahan bahan penguat pada RAPP berupa aluminium oksida (Al2O3) atau alumina. Tujuan penelitian untuk menganalisi pengaruh penambahan aluminium oksida pada bahan basis gigi tiruan RAPP terhadap kekuatan tarik dan tekan. Metode: Jenis penelitian eksperimental laboratoris. Sebanyak 25 sampel berbentuk flat dumbbell shaped berukuran 60x12x3,9 (mm) untuk uji kekuatan tarik dan 25 sampel  berbentuk balok dengan ukuran 10x10x4 (mm) untuk uji kekuatan tekan. Pencampuran bubuk resin-aluminium oksida konsentasi 0,5%, 1,5%, 2,5% dan 3,5% dengan cairan resin dilakukan secara manual. Sampel direndam dalam air dan dimasukkan ke dalam inkubator. Uji dilakukan menggunakan universal testing machine dengan beban 1000N dan kecepatan crosshead 1mm/menit. Data dianalisis dengan uji ANOVA satu arah dan uji LSD. Hasil: Nilai kekuatan tarik kelompok kontrol dan keempat kelompok perlakuan penambahan aluminium oksida 0,5%, 1,5%, 2,5 %, 3,5% berturut turut adalah 50,867 MPa, 47,895 MPa, 45,107 MPa, 42,476 MPa, dan 39,753 MPa; sedangkan nilai kekuatan tekan kelompok kontrol dan keempat kelompok perlakuan penambahan aluminium oksida 0,5%, 1,5%, 2,5%, 3,5% berturut turut adalah 88,267 MPa, 106,085 MPa, 122,283 MPa, 135,367 MPa, dan 156,571 MPa. Penambahan bubuk aluminium oksida pada RAPP dapat menurunkan kekuatan tarik dan meningkatkan kekuatan tekan secara signifikan (p=0,0001 (p<0,05)), seiring dengan meningkatnya jumlah konsentrasi aluminium oksida yang ditambahkan. Simpulan: Penambahan aluminium oksida pada bahan basis gigi tiruan resin akrilik polimerisasi panas berpengaruh terhadap kekuatan tarik dan tekan.Kata kunci: Resin akrilik polimerisasi panas, aluminium oksida, kekuatan tarik, kekuatan tekan. ABSTRACT            Introduction: Heat-polymerised acrylic resin (HPAR) is the most widely used denture base material but has a low tensile and compressive strength thus modification is needed by adding reinforcement in the form of aluminium oxide (Al2O3) or alumina. The research objective was to analyse the effect of adding aluminium oxide on the tensile and compressive strength of HPAR denture base material. Methods: An experimental laboratory research was conducted towards the total of 25 samples in the form of flat dumbbell shape sized 60 x 12 x 3.9 mm for the tensile strength test, and 25 samples in the form of blocks with the size of 10 x 10 x 4 mm for the compressive strength test. The mixture of powdered aluminium oxide resin with the concentrations of 0.5%, 1.5%, 2.5%, and 3.5% with a liquid resin was carried out manually. The sample was then immersed in the water and put in an incubator. The test was performed using a universal testing machine with 1000 N loads and 1 mm/minute crosshead speed. Data obtained were analysed using the one-way ANOVA and LSD test. Result: The tensile strength values of the control group and all four treatment groups added with 0.5%, 1.5%, 2.5%, and 3.5% aluminum oxide were 50.867 MPa, 47.895 MPa, 45.107 MPa, 42.4476 MPa and 39.753 MPa respectively, while the compressive strength values were 88.267 MPa, 106.085, 122.283 MPa, 135.367 MPa, and 156.571 MPa consecutively. Addition of aluminium oxide powder to the HPAR can significantly reduce the tensile and compressive strength (p = 0.0001 (p < 0.05)) along with increasing concentration. Conclusion: Addition of aluminium oxide towards the HPAR denture base affected its tensile and compressive strength.Keywords: Heat-polymerised acrylic resin, aluminium oxide, tensile strength, compressive strength.

scholarly journals Comparing the Shear Bond Strength with Acrylic Teeth, Hardness, Surface Roughness and Cost-benefit of three Different Denture Base Materials

2018 ◽  
Vol 11 (4) ◽  
pp. 2181-2190
Author(s):  
Humam M. Al-somaiday ◽  
M. A. Mohammed Moudhaffer ◽  
Mahmood Jasim Alsamydai
Keyword(s):  
Surface Roughness ◽  
Bond Strength ◽  
Shear Bond Strength ◽  
Base Material ◽  
Cost Benefit ◽  
Mean Value ◽  
Denture Base ◽  
Base Materials ◽  
Us Dollar ◽  
Artificial Teeth

One of the major problem affecting the denture function is the detachment of the artificial teeth from denture as a result to the higher chewing capacity that will rise the risk of artificial teeth displacement. Displacement of the teeth may precede by changing in the material properties affecting the denture function that is why surface roughness and hardness considered as a predictor for the material behaviors and performance. Replacing a denture may cause a burden to the patients, hence, the material and fabrication coasts of dentures should be considered as one of the major factors affecting the selection of the denture base material, as in some cases a base material with impressive propertied limitedly used because of its expenses.[1] In this study, shear bond strength with acrylic teeth, hardness, surface roughness and the net benefits, associated with alternatives for achieving defined treatment objective, were evaluated by comparing some properties of three different denture base materials with the cost of each one in Iraq. A total of (90) specimens of polycarbonate, injectable acrylic and conventional heat cured acrylic were fabricated according to manufacturer’s instructions and divided into (3) groups, (30) specimens for each testing group i.e. the shear bond strength with acrylic teeth, shore D hardness and surface roughness (10 specimens for each testing material). the total cost of each specimens group was collected and calculated to evaluate the overall cost benefit of each material. Highly significant differences (P≤ 0.01) between all the (3) experimental materials were noticed after analyzing each test's results with descriptive statistical analysis, one-way ANOVA and post-hoc LSD, except for the shore D hardness whereas a non-significant differences(P> 0.05) between heat cured and injectable acrylic was found. The heat cured acrylic has the highest mean value of the shear bond strength with acrylic teeth (516.1 N) followed by the injectable acrylic with (329.9 N) mean value while the lowest mean value was for the Polycarbonate (180.1 N). Furthermore, the injectable acrylic has the highest mean value in shore D hardness (91.96), followed by the heat cured acrylic (91.5), then Polycarbonate (82.94). As for surface roughness, the Polycarbonate has the highest mean value (0.31703) followed by the injectable acrylic (0.2129), then the heat cured acrylic (0.10367). Finally, Polycarbonate has the highest mean value of the specimens’ cost in Iraq (10.022 US dollar /specimens), followed by the injectable acrylic (8.695 US dollar /specimens) then the heat cured acrylic (3.243 US dollar /specimens). All thermoplastic materials included in this study (Injectable acrylic and Polycarbonate) exhibited higher cost with lower properties in comparison with heat cured acrylic material for the selected tests.

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