[The delayed impression and rebasing in the construction of full lower dentures].
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Denture, Complete↗
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Custom-made denture teeth and denture base material for removable partial dentures.
A method that uses Isosit material to fabricate custom-made denture teeth and denture base has been described. The advantages of this technique are the denture teeth can be made to function in harmony with dynamics of the stomatognathic system; any type of occlusal scheme can be used; the material is esthetically pleasing; it can be characterized; it can be used as a denture base material, which can also be characterized; it can be repaired, relined, or rebased with little difficulty; and laboratory procedures can be accomplished in the dental office or laboratory.
Acrylic Resins↗
[Osseointegrated implants in clinical dentistry from the point of view of prosthodontics].
With the life expectancy of our country reaching 80s we are encountering a society with greater proportion of the population in old ages. This social problem creates a relatively important assignment in the area of prosthodontics, especially in full denture prosthodontics. Though the most important factor that affects the success or failure of full denture prosthodontics is the condition of the residual ridge, recent studies have shown that the residual ridges continue to resorb throughout one's life span. Also our survey on the present Japanese denture patients tells us that an average person becomes edentulous at an age of 57.6, has made a full denture twice or more, has worn the denture for 8 to 10 years, and by age 65 to 67 over half of the patients have their mandibular residual ridges being even or the ridge has resorbed extremely so that the ridge is actually lower than the floor of the mouth. With the situation as it is, when we look into the future of the full denture prosthodontics it is inevitable that there will be a rapid increase in patients with extremely resorbed ridges which the present theory of full denture prosthodontics could not handle. In this sense, prosthodontic treatment of edentulous patients with implants is a relatively interesting field. In this article we will comment of the basic application technique and the prosthodontic technique which we have improved of the Brånemark's Osseointegrated implants which possess the long term basic objective clinical data and whose long term safety has been established in edentulous patients. First we will explain the basic application technique using a real case. The patient was a 56 years old female. She came to the clinic with the chief complaint of severe masticatory dysfunction due to unstable full dentures. She strongly desired fixed prosthodontics. She had worn dentures for the past 17 years. The dentures that she had on when she came in for the first visit were her 4th set of dentures. For the past 8 years she had her dentures adjusted and rebased repeatedly. Her maxillary residual ridge had an average height but her mandibular residual ridge was extremely resorbed. EMG examination exhibited conspicuous distortion in chewing rhythm. From the mandibular movement, radiographs of the TMJ regions and the clinical observations it was determined that the vertical dimension had been lost and that her mandible was displaced toward her left and anteriorly. Palpation indicated the condition of muscular tension similar to that of TMJ dysfunction patients.(ABSTRACT TRUNCATED AT 400 WORDS)
Dental Implantation, Endosseous↗
Implant-retained mandibular overdentures: a simplified, cost-effective treatment approach.
The use of implant-retained complete overdentures is a viable treatment modality in compromised patients. Use of two separate implants in the mandible enhances the retention and stability of the denture, which is still mainly supported by soft tissues. A technique for clinical fixation of the internal attachment to a laboratory-rebased and tissue-loaded mandibular overdenture is described. The advantages, disadvantages, and the rationale of the treatment are presented.
Dental Abutments↗
Strength of relined denture base polymers subjected to long-term water immersion.
PURPOSE: This study was undertaken to characterize the long-term equilibrium flexural strength at proportional limit (FSp) of 4 denture reline polymers processed onto 4 denture base polymers. MATERIALS AND METHODS: A 3-point flexural test was applied on rectangular specimens of each denture base polymer-denture reline polymer. Each specimen was immersed in water for 4 months prior to and 4 months after reline. RESULTS: Significant differences existed among the relined specimens because of the denture base polymer variable, the denture reline polymer variable, and their interaction (P < 0.05). The descending order in FSp according to the denture base polymer, arranged in terms of statistical significance was: Acron approximately Acron MC > Triad > Palapress Vario, where approximately denotes no significant difference between Acron and Acron MC. The descending order in FSp according to the denture reline polymer, arranged in terms of statistical significance was: Triad > Rebaron > Rebaron LC > Tokuso Rebase. Significant difference existed among all of the denture reline polymers. CONCLUSION: The present study showed that the long-term equilibrium strengths of 4 denture reline polymers processed onto 4 denture base polymers were different. The strength of the relined specimen of a denture base is dependent on the strength of the denture base polymer and that of the reline polymer.
Acrylic Resins↗
A comparison of three hard chairside denture reline materials. Part I. Clinical evaluation.
Three chairside reline materials were each used to reline ten complete dentures. Comfort, fit, colour change, staining and integrity were assessed at 3, 6, and 12 months post-placement. Working and setting times were obtained using an oscillating rheometer. Tokuso Rebase Fast Set had the shortest working and setting times. It was the most colour stable, stain resistant and durable. Coe Kooliner was difficult to use due to high flow. Total Hard had the longest working and setting times, and the poorest stain resistance and durability. Severe loss of reline materials only occurred 12 months after placement, and then mostly from within lower dentures. No differences between the materials were noted for the other parameters investigated.
Acrylic Resins↗
[Prevention of alveolar bone loss].
This article describes the bone resorption and remodeling of the edentulous jaw, starting right after extraction of teeth. This resorption is a physiological process, but can be influenced by wearing dentures. Load on the mucosa and disturbed blood circulation of the mucosa caused by the denture gives an additional bone resorption. The prevention of bone resorption can be executed in saving teeth or roots as long as possible. But when the jaw is already edentulous it is necessary to create an optimal function and load-dividing of the denture and regular controls are indicated. From time to time the denture has to be rebased or relined due to the changes in contour of the jaw. Also a daily massage of the mucosa after cleaning the denture is advisable to restore a normal blood circulation.
Alveolar Bone Loss↗
In vitro evaluation of the influence of repairing condition of denture base resin on the bonding of autopolymerizing resins.
STATEMENT OF PROBLEM: Bonding failures of repair resin to denture base resin occurs when denture base resin is wet, however, little is known of how water relates to failures. PURPOSE: This study evaluated the influence of water absorbed in denture base resin on the bond strength and resistance to cyclic thermal stresses of autopolymerizing resins bonded to denture base resin. MATERIAL AND METHODS: Denture base resin disks (n = 180; 12 mm diameter and 3 mm thick) were fabricated from heat-polymerized acrylic resin (Lucitone 199). The disks were divided into groups (n = 60) with 3 conditions of water content: (1) complete water saturation (control), (2) superficial desiccation by blowing air on the specimen, or (3) complete desiccation. Each denture base specimen received 1 of 3 surface treatments (n = 20) including: (1) no treatment, (2) airborne-particle abrasion, or (3) methylene chloride application. An autopolymerizing repair resin (Repair Material, n = 10) or reline resin (Tokuso Rebase Normal set, n = 10) was applied to the bonding area (5 mm diameter) and polymerized at 37 degrees C for 10 minutes. The resistance to cyclic thermal stress was determined after subjecting the specimens to 50,000 thermal cycles between 4 degrees C and 60 degrees C water baths with a 1-minute dwell time (n = 5 per group). Bond strength (MPa) was measured by shear bond testing at a 1.0 mm/min crosshead speed until the applied resin debonded from denture base resin. Data were statistically analyzed by 3-way analysis of variance and multiple comparisons among the groups were performed with Bonferroni test (alpha = .05). RESULTS: The mean bond strengths of repair resin to airborne-particle-abraded denture base specimens were not significantly influenced by either thermal cycling or water content. The mean bond strengths of reline resin significantly decreased after thermal cycling (P < .0001) regardless of the conditions of surface treatment and water content. For methylene chloride treated specimens, bond strengths of both repair and reline resins to completely water saturated specimens were significantly higher than those of completely desiccated specimens (P = .0048 for repair resin, P < .0001 for reline resin) after thermal cycling. CONCLUSIONS: Bond strengths of autopolymerizing resin to denture base resin were not significantly influenced by water content of denture base resin but were significantly influenced by resin type, thermal cycling, and surface treatment.
Absorption↗
[Delayed impression and rebasing considered as normal method of execution of lower full dentures; technic facilitated by use of alginates].
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Alginates↗
Influence of thermal and mechanical stresses on the strength of intact and relined denture bases.
STATEMENT OF PROBLEM: Denture bases may become increasingly weaker as a result of thermal stress and flexural cyclic loading. Information regarding this potential problem and its relationship to the denture base reline is limited. PURPOSE: This study evaluated the influence of thermal and mechanical stresses on the strength of intact and relined denture bases. MATERIAL AND METHODS: Twenty-eight microwave-polymerized (Acron MC) intact denture bases were prepared in the shape of a 3-mm-thick maxillary denture. Additionally, fifty-six 2-mm-thick denture bases were relined with 1 mm of autopolymerizing resin (Tokuyama Rebase Fast II or New Truliner) (n=28). Intact and relined specimens were divided into 4 groups (n=7) as follows: without stress (control); a mechanical stress at 0.8 Hz for 10,000 cycles; 5000 thermal cycles between 5 degrees C and 55 degrees C; or a combination thermo-mechanical stress. The specimens were vertically loaded in compression with a rounded rod at 5 mm/min until failure, using a universal testing machine. Data on maximum fracture load (N), deflection at fracture (%), and fracture energy (N.mm) were analyzed by 2-way analysis of variance and Student-Newman-Keuls tests (alpha=.05). RESULTS: The strength of the denture bases relined with New Truliner was not significantly affected by any of the experimental conditions, but comparing the control groups, New Truliner exhibited the lowest maximum fracture load values. The maximum fracture load of intact denture bases (P=.002) and those relined with Tokuyama Rebase Fast II (P=.01) showed a significant decrease after thermal stress. Additionally, cyclic loading significantly decreased the maximum fracture load (P<.001), deflection at fracture (P=.025), and fracture energy (P<.001) of intact denture bases and those relined with Tokuyama Rebase (P values of .002, .039, and .001, respectively). CONCLUSION: Thermal and mechanical stresses exert deleterious effects on the strength of intact and/or relined denture bases, which vary according to the relining material used.
Acrylic Resins↗
A comparison of three hard chairside denture reline materials. Part II. Changes in colour and hardness following immersion in three commonly used denture cleansers.
This study investigated the effects of daily use of three denture cleansers on three hard chairside reline materials over a 6-month period. Two controls were used; one dry and one involving storage in water. Colour and hardness were measured at 0 (baseline) and 6-months. There was no significant colour change with Tokuso Rebase Fast Set. Coe Kooliner and Total Hard changed colour more with the short acting peroxide cleanser (Steradent 3 Minutes) than with the overnight peroxide cleanser (Steradent Fresh) and the hypochlorite cleanser (Dentural). The hardness of all materials remained unchanged over the whole test period.
Acrylic Resins↗
Flexural strength of autopolymerizing denture reline resins with microwave postpolymerization treatment.
STATEMENT OF PROBLEM: Microwave postpolymerization has been suggested as a method to improve the mechanical strength of repaired denture base materials. However, the effect of microwave heating on the flexural strength of the autopolymerizing denture reline resins has not been investigated. PURPOSE: This study analyzed the effect of microwave postpolymerization on the flexural strength of 4 autopolymerizing reline resins (Duraliner II, Kooliner, Ufi Gel Hard, and Tokuso Rebase Fast) and 1 heat-polymerized resin (Lucitone 550). MATERIAL AND METHODS: For each material, 80 specimens (64 x 10 x 3.3 mm) were polymerized according to the manufacturer's instructions and divided into 10 groups (n = 8). Control group specimens remained as processed. Before testing, the specimens were subjected to postpolymerization in a microwave oven using different power (500, 550, or 650 W) and time (3, 4, or 5 minutes) settings. Load measurements (newtons) were made at a crosshead speed of 5 mm/min using a 3-point bending device with a span of 50 mm. The flexural strength values were calculated in MPa. Data analyses included 3-way and 2-way analysis of variance and the Tukey Honestly Significant Difference test (alpha = .05). RESULTS: The flexural strengths of resins Duraliner II and Kooliner were significantly increased (P = .0015 and P = .0046, respectively) with the application of microwave irradiation using different time/power combinations. The materials Lucitone 550, Tokuso Rebase Fast, and Ufi Gel Hard demonstrated no significant strength improvement compared to the corresponding control. Only after microwave postpolymerization irradiation for 3 minutes at 550 W did Lucitone 550 show significantly higher flexural strength (P =.001) than Tokuso Rebase Fast and Ufi Gel Hard relining resins. CONCLUSION: Microwave postpolymerization irradiation can be an effective method for increasing the flexural strength of Duraliner II (at 650 W) and Kooliner (at 550 W and 650 W for 5 minutes).
Acrylic Resins↗
Application of carbon fiber (CF)-cloth reinforcement to upper complete denture base.
The acrylic resin denture base is used more than the usual metal denture base because of the low cost, simple process to make and easy rebasing. But, as the strength of the resin is weaker, the upper resin denture base is three to four times as thick as the metal denture base. So, a study was made to make the upper complete resin denture base thinner while maintaining the strength of the resin denture bases currently in use now. To make the palatal area of the denture base thinner was made possible by the application of carbon fiber (CF)-cloth reinforcement. The resin denture base reinforced by the CF-cloth was of a thickness of 0.7 mm and was evaluated for the mechanical properties of bending. As a result, it was found that both the stiffness and strength were improved by 10% or more as compared with those of the ordinary resin denture bases.
Carbon↗
Effect of relining, water storage and cyclic loading on the flexural strength of a denture base acrylic resin.
OBJECTIVES: This study investigated the effect of relining, water storage and cyclic loading on the ultimate flexural strength (FS(U)) and on the flexural strength at the proportional limit (FS(Pl)) of a denture base acrylic resin (Lucitone 550-L). METHODS: Rectangular bars of L were made (64 mm x 10 mm x 2 mm) and relined (1.3mm) with four relining resins (Kooliner-K, Ufi Gel Hard-UGH, Tokuso Rebase Fast-TR and New Truliner-NT). In addition, specimens relined with L and intact L specimens were made (64 mm x 10 mm x 3.3 mm). A three-point flexural test was applied on the specimens (n=10) after (1) polymerization; (2) water storage (30 days); (3) cyclic loading (10,000 cycles at 5 Hz) and (4) water storage (30 days)+cyclic loading. Data (MPa) were analyzed with three-way ANOVA and Tukey's HSD tests (alpha=0.05). To test for a possible correlation between FS(U) and FS(Pl), a linear regression coefficient "r" was calculated. RESULTS: After water storage, L-UGH and L-TR demonstrated an increased FS(U) (41.49-50.64 MPa and 49.95-57.36 MPa, respectively) (P<0.05). Only L-TR demonstrated an increased FS(Pl) (20.58-24.21 MPa) after water storage (P<0.05). L-L had the highest FS(U) (between 78.57 and 85.09 MPa) and FS(Pl) (between 31.30 and 34.17 MPa) (P<0.05). The cyclic loading decreased the FS(U) and FS(Pl) of all materials (P<0.05). Regression analysis showed a strong linear correlation between the two variables (r=0.941). CONCLUSIONS: Water storage improved the FS(U) of L-UGH and L-TR and the FS(Pl) of L-TR. L-L produced the highest FS(U) and FS(Pl). The FS(U) and FS(Pl) of all materials were detrimentally influenced by cyclic loading.
Acrylic Resins↗
The effects of drug and water incorporation upon some physical properties of cold cured acrylic.
The addition of drugs to the cold cured acrylics has been demonstrated to variably affect their mechanical properties. This study investigated the effects, to the mechanical properties of a cold cured denture base material, of the addition of drugs and water. Chlorhexidine acetate was incorporated into the denture reline material at 10% w/w in the polymer phase of the material. Specimens also contained 10, 20, or 30% water w/w in the monomer phase of the material with or without the drug. The hardness of the specimens decreased with the addition of water to drug containing or drug-free specimens. Furthermore, there was a significant reduction in the modulus of elasticity of the material with the addition of drugs and water or water alone, which was progressive as the amount of water increased. The load at fracture was similarly reduced as the water incorporation increased. The results demonstrated the considerable effects drug and water incorporation had upon the material. However, this would not negate the use of the material in the oral cavity in the reline or rebase situation employing existing prostheses. Moreover, the reduction in material strength may have the advantage of progressive loss of material with a resulting improved release pattern of the contained drug.
Chemical Phenomena↗
Prosthetic needs and demands for services of a group of elderly people in Israel.
Prosthetic needs and demands for care were investigated in a group of the elderly, residing in Romema, Jerusalem, Israel. Of the population aged 60 and above residing in the neighborhood, 34% (n = 116) were selected at random. These were examined under standardized conditions and prosthetic status and denture requirements were recorded. The findings indicate that the prosthetic status was poor and the treatment needs extensive. In all, over 83% of the study population were edentulous, the majority in both arches. Although 86.3% of the edentulous subjects possessed dentures, over 86% of these subjects needed some form of prosthetic treatment. About 60% needed new full or partial dentures and over 25% had dentures whose fit and retention could be improved by rebasing, relining or minor adjustments.
Aged↗
[Studies on the flow properties of autopolymerizing hard-setting resins used as direct relining materials for denture bases].
Autopolymerizing hard-setting direct relining resin is currently being used in dentistry to attain denture bases that conform to the supporting tissues with a high degree of accuracy. The purpose of this study is to investigate the flow of six commercial hard-setting direct relining resins (Denture Liner, Kooliner, New Truliner, Rebaron, Swift, Tokuso Rebase) and several types of impression materials (zinc oxide-eugenol, polysulfide rubber, silicone rubber) using the parallel plate viscometer. The viscometer is used to measure the spread radius of samples (a volume of 0.5 cm3) between two parallel flat plates when a load of 750-gram weight is applied at 1, 10, 60, 100 seconds after loading has begun. In this experiment, the load was applied at 120, 150, 180, 210, 240, 300 seconds after mixing had begun. All the samples were mixed according to the manufacturer's recommendations. The findings were as follows; 1. The flow of the six commercial hard-setting direct relining resins could be compared with one another by the spread radius at 1 second after loading (r1) with no relation to time lapse after initiation of the mix. 2. Denture Liner, Kooliner, Rebaron and Swift had the same flow characteristic when r1 was the same. 3. Polysulfide rubber impression materials had similar flow characteristic to hard-setting direct relining resins.
Acrylic Resins↗
Effect of microwave disinfection on the flexural strength of hard chairside reline resins.
OBJECTIVES: This study investigated the effect of microwave disinfection (650W/6 min) on the flexural strength of five hard chairside reline resins (Kooliner, Duraliner II, Tokuso Rebase Fast, Ufi Gel Hard, New Truliner) and one denture base resin (Lucitone 550). METHODS: Thirty-two specimens (3.3x10x64 mm) from each acrylic resin were produced and divided into four groups of eight specimens each. The flexural test was performed after polymerization (G1), after two cycles of microwave disinfection (G2), after 7 days storage in water at 37 degrees C (G3) and after seven cycles of microwave disinfection (G4). Specimens from group G4 were microwaved daily being stored in water at 37 degrees C between exposures. The specimens were placed in three-point bend fixture in a MTS machine and loaded until failure. The flexural values (MPa) were submitted to ANOVA and Tukey's test (p=0.05). RESULTS: Two cycles of microwave disinfection promoted a significant increase in flexural strength for materials Kooliner and Lucitone 550. After seven cycles of microwave disinfection, materials Kooliner and New Truliner showed a significant increase (p<0.05) in flexural values. The flexural strength of the material Tokuso Rebase was not significantly affected by microwave irradiation. Seven cycles of microwave disinfection resulted in a significant decrease in the flexural strength of material Duraliner II. Material Ufi Gel Hard was the only resin detrimentally affected by microwave disinfection after two and seven cycles. CONCLUSIONS: Microwave disinfection did not adversely affect the flexural strength of all tested materials with the exception of material Ufi Gel Hard.
Acrylic Resins↗