Bond Strengths of Soft-Liners to chemically different Denture Base Polymers (original) (raw)
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Tensile bond strengths of silicone soft liners to two chemically different denture base resins
International Journal of Adhesion and Adhesives, 2012
Silicone-based soft liners can be useful for patients who have difficulty to tolerate the hard-based dentures. However lack of adhesion to the denture base resin can be a problem that limits their clinical use. This study evaluated the tensile bond strengths (TBS) of four silicone soft liners (GC Soft, GC XSoft, Silagum, Mollosil) to two chemically different denture base resins, polymethyl methacrylate (PMMA) and urethane dimethacrylate (UDMA). Specimen consisted of soft liner material self-cured between two square plates of cured denture base resin measuring 20 Â 20 Â 4 mm. The circular bonding area of soft liner to each plate was 10 mm in diameter. Proprietary primer was applied to the surface of the denture base specimens before bonding following the manufacturers' recommendations. Ten specimens for each denture base-soft liner combination were prepared and tested under tension on a Shimadzu Universal Testing Machine at a cross head speed of 5 mm/min. The mode of failure was determined using a stereo-microscope at magnification of 10x. Two-and one-way ANOVA and post-hoc Dunnett-T3 and t-test were used for statistical analysis. There were significant differences in TBS values for the effect of denture base resins, soft liner and their interaction (po 0.05). The TBS of soft liners to PMMA was significantly higher than to UDMA denture base resins except for Silagum where no significant difference was observed. A mixed mode of failure was more common for all soft liners bonded to PMMA except for Silagum while adhesive failure was more predominant in the UDMA group.
International Journal of Advanced Research (IJAR), 2019
Denture liners are polymers used on the intaglio surface of the denture. Adhesive failure can create environment for bacterial growth, staining, and failure of lining materials.Hence, the integrity of the junction needs to be evaluated because two materials polish differently.Therefore, this study compares the tensile bond strength and gap width between soft liner to heat-polymerized, injection-molded and light polymerized acrylic resins. Materials and Methods:-Ten dumbell shaped specimens for tensile bond test and square shaped specimens for gap width were fabricated with the metal mold. Putty index of dumbell shaped mold with the rectangular die in centre and two metal blanks were made. The specimes were placed in the index, adhesive was applied onto the bonding surface and soft liner was added. Tensile bond strength was determined in universal testing machine and gap width was observed under scanning electron microscope.Specimens were divided into 3 groups for tensile bond test and for gap width: T1, G1 heat-polymerizing; T2, G2 injection-molded; T3, G3 light activated denture base resins.Statistical analysis of the obtained data was done by ANOVA and post-hoc Tukey?s test. Results:-Therewas significant difference in the tensile bond strength among the three groups (p<0.05), and the mean gap width was not significant between G1 and G3 group and highly significant value was seen among G1 and G2; G2 and G3 groups (p<0.05). Conclusion:-Mollosil B bonds best with heat-polymerized denture base material and least gap with between denture base and soft liner.
International Journal of Scientific Research in Science and Technology, 2019
This study evaluated the effect of two commonly used methods of processing permanent soft liner on tensile bond strength between denture base and soft liner. Silicone based soft liner was used in this study. Ten heat cure dumbbell shaped specimens along with soft liner were processed together. Another ten heat cure dumbbell shaped specimens were fabricated and later relined with soft liner. All the specimens were subjected to tensile bond strength test. Specimens relined directly with soft liner at the time of processing the denture base resin showed significantly higher bond strength.
Evaluation of bond strength of soft relining materials to denture base polymers
dental materials, 2007
Chairside Dental materials Relining Silicone Tensile failure a b s t r a c t Objectives. To evaluate the initial bonding properties of recently and previously introduced soft relining materials to denture base polymers with different polymerization techniques and different water content. Methods. The initial tensile bond strength of 10 soft liners (Mollosil Plus, Dentusil, Ufi gel Soft, GC Reline Soft, Silagum Comfort, Vertex Soft, Astron Soft, Molloplast B, Flexacryl Soft, Triad Resiline) to three denture base polymers (Paladon 65, Palapress Vario, Ivocap Plus) were assessed with a modified method. Paladon 65 specimens immersed in water for 3 months were also used to test the effect of water content of denture base polymer on bond strength results. After testing, a visual examination of the fracture surfaces and a SEM investigation of the interface structure were performed. Tensile strength of each soft liner material was also tested. Data were analyzed statistically by two-way ANOVA (alpha = 0.05). Results. Significant differences were found among tensile bond strength results (P < 0.05). Vinyl poly(organosiloxane) soft liners (Mollosil Plus, Dentusil, Ufi gel Soft, GC Reline Soft, Silagum Comfort) and a plasticized PMMA soft liner (Vertex Soft) gave statistically similar bond strength results for different denture base polymers (P > 0.05). For the other materials used (Astron Soft, Molloplast B, Flexacryl Soft, Triad Resiline), different denture base polymers caused significantly different results (P < 0.05). Poly(organosiloxane) based materials gave slightly higher bond strength results with water immersed specimens than with the dry specimens. Significance. A wide variety of newly formulated soft liners used in this study gave comparable or better bond strength results compared to Molloplast B.
Egyptian Dental Journal
Purpose: The study was conducted to evaluate the tensile bond strength between acrylic-based and silicon-based denture liners bonded to conventional heat-cured PMMA and 3D-printed denture base materials. Materials and Methods: A total of forty dumbbell-shaped specimens were fabricated for the test of tensile bond strength with dimensions 75 mm in length, 12mm in diameter at its thickest portion, and 7 mm at its thinnest section. The specimens were divided into two equal groups (n=20) depending on the denture base material (conventional heat-cured PMMA and 3D-printed) and each group was subdivided into two subgroups (n =10) depending on the material of soft liner bonded to it, subgroup A: Acrylic-based soft liner and subgroup B: Silicon-based soft liner. Results: The silicon-based soft liner bonded to conventional PMMA recorded the highest tensile bond strength while the least value for bond strength mean was recorded by the acrylicbased liner bonded to the 3D-printed denture resin. Conclusion: The silicon-based soft liner showed greater bond strength to conventional PMMA and 3D-printed denture bases than the acrylic-based soft liner.
Saudi Journal of Oral and Dental Research
Background: Background: To evaluate and compare the hardness and tensile bond strength of a silicone soft lining material, after short term immersion in two different denture cleansing solutions and water over varying time periods. Materials & Methods: The study comprised of 3 groups followed by 3 subgroups under each groups of 10 specimens for evaluation of tensile bond strength with heat cure denture base acrylic resin, and 3 groups followed by 3 subgroups under each groups of 10 specimens each for the hardness test of soft liners. Group A: Heat polymerized silicone based resilient liner immersed in denture cleansing solution secure with 700mg of sodium perborate monohydrate, Group B: Heat polymerized silicone based resilient liner immersed in denture cleansing solution clinsodent with 480mg of sodium perborate monohydrate and Group C: Heat polymerized silicone based resilient liner immersed in water. Results: At day 1 and 1 week, Group B showed highest tensile bond strength (1.50...
Al-Azhar Dental Journal for Girls, 2016
Background: Soft lining materials play an important role in modern prosthodontics because of their capability of restoring health of inflamed and distorted mucosa. Gradual changes of oral tissues require that complete or partial dentures be relined to improve their adaptation to the supporting tissue. This study aimed to evaluate the shear bond strength (SBS) of heat cured acrylic and injection-molded Valplast TM denture base materials to silicone self-cure soft lining materials, with and without adhesive, after storage in two different times in artificial saliva. Materials and Methods: 40 rectangular specimens were prepared from two types of self-cured silicone soft lining material, one with adhesive and the other without adhesive were applied to two types of denture base materials (heat polymerized Polymethyl methacrylate and injection-molded nylon denture base materials). Shear bond strength of the specimens was measured, after immersion in artificial saliva for different periods (72 hours or 10 weeks), using Lloyd universal testing machine. Results: Acrylic denture base bonded to soft liner with adhesive at 72 hours of immersion in artificial saliva showed the highest shear bond strength. Comparing SBS values of the tested soft lining materials revealed significant differences between adhesively bonded and non-adhesively bonded types. Conclusions: This study concluded that the bond strength of the silicone soft lining materials with denture base materials increased with adhesive. Silicone soft lining materials are affected by artificial saliva storage.
Bond strength and failure analysis of lining materials to denture resin
Dental Materials, 1999
Objectives: This study was conducted to investigate the bonding properties of five lining materials to a denture base resin. Two hard (chemical-cured resin: Kooliner "Coe Labs, USA" and light-cured VLC resin: Triad "Dentsply, USA") and three soft (chemical-cured resin: Express "Alcos,-USA", heat-temperature vulcanized 'HTV' silicone material: Molloplast-B "Regneri GmbH, Germany" and room-temperature vulcanized 'RTV' silicone material:Ufi Gel-P "Voco,Germany") liners were used.
The aim of this study was to determine the bond strength of two soft liners to Heat cure poly methyl methacrylate denture base resins by various surface preparation of resin. Materials and Methods: GC Reline soft and soft liner (GC Corporation, Tokyo, Japan) a permanent self cure denture soft lining materials were used in this study. Specimens were prepared by stainless steel dies of 40 mm length, 10 mm wide, 10 mm and a cross sectional area of 10mm x 10mm. The specimen categorized in 2 groups along with 5 subgroups. Results: Statistical analysis done was ANOVA and Student 't' test. Bond strength was measured by universal testing machine. Significant difference was found in bond strength of silicon and acrylic including its subgroups. Conclusion: From the above study it can be concluded that highest bond strength was seen in the Acrylic group. In matter of best physical surface treatment Silicone group showed Sand papering was better than Sand blasting. In respect to chemical surface treatment, silicone group showed that application of Acetone was better than Methyl Methacrylate. Best combination was seen in the Polymethyl methacrylate to Acrylic soft liner after the Polymethyl methacrylate was treated with Methyl Methacrylate.