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Results for “Denture Repair”

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PubMed2004

Effect of plasma treatment on adhesion of self-curing repair resin to acrylic denture base.

Plasma irradiation on surface of heat-cured acrylic resin prior to processing self-curing acrylic resin is likely to effectively increase the adhesive strength between these materials for short-term period. However, long-term reliability of adhesive strength between these materials has not been clarified yet. In the present study, these materials were stored in water for a long period (100 days), and the effect on their shear bond strength was investigated. Forty-four test specimens with flat bonding test surface were made with heat-cured acrylic resin. They were divided into four groups according to treatment procedures for bonding surface: plasma treatment, adhesive primer application, adhesive primer application after plasma treatment, and no treatment (for control). Self-curing acrylic resin was processed against all bonding surfaces. After storage in water for 100 days, shear bond strength values between heat-cured and self-cured acrylic resins were measured. Specimens in plasma treatment group exhibited higher shear bond strength value than those in control, although the difference was not significant.

Acrylic Resins↗
PubMedDate not supplied

Intraoral repair of the fractured porcelain restoration.

Until recently, there was no predictable technique for repairing the fractured porcelain restoration. However, with the advent of many new products related to bonding porcelain, there are techniques available today to repair fractured porcelain with moderate expectations of success.

Acidulated Phosphate Fluoride↗
PubMedDate not supplied

[The burning mouth syndrome. A clinical study].

Burning mouth syndrome (BMS) is a distinct clinical entity characterized by a chief complaint of unremitting oral burning concomitant with no oral mucosal clinically observable lesions. Numerous causes of this condition have been suggested, including local factors, systemic factors, and psychogenic disorders. A total of 36 consecutive subjects, 32 women and 4 men, complaining of BMS, who had attended the Dental Clinic of the University of Ferrara during a period of 2 years, was studied. The method of assessment followed closely a strictly co-ordinated management protocol based on conventional guidelines, namely history, clinical examination and special investigations. A detailed history was taken of duration of the condition, site affected, and pattern of burning. The severity and the response to treatment were assessed with a Visual Linear Analogue Scale (VLAS). A full medical history was taken, with regard to xerostomia-inducing drug assumption. The presence and the severity of menopausal symptoms were explored. Inquiries were made on use of mouthwashes. For the denture-wearers, specific questioning was directed to the length of denture-wearing experience, temporal association of the symptom with the wearing of dentures, relationship to burning sensation of any relines or repairs, denture cleaning technique, and use of fixatives. A complete routine intraoral and extraoral examination was performed. The presence of parafunctional habits, such as tongue thrusting, clenching, grinding, lip and cheek biting, was investigated. If dentures were worn, their design and condition were examined. In particular, the relation between the vertical and horizontal components of the jaw and the denture base extension was assessed and the freeway space measured.(ABSTRACT TRUNCATED AT 250 WORDS)

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PubMed2005

Flexural strengths of denture base resin repaired with autopolymerizing resin and reinforcements after thermocycle stressing.

PURPOSE: Fracture of an acrylic denture base is a common problem in prosthodontic practice. Although various reinforcement methods have been used, when a fractured denture base is repaired with autopolymerizing resin recurrent fractures frequently occur at the repairing interface or adjacent areas. The purpose of this study was to evaluate the maximum flexural load of denture base resin repaired with autopolymerizing resin and several reinforcement systems after thermocycle stressing. MATERIALS AND METHODS: Rectangular (10 x 70 x 3 mm) flexural specimens were fabricated by repairing a pair of heat-cured denture base resin specimens using autopolymerizing resin and a series of reinforcement materials. The materials included 4 metal wires and a woven glass fiber. Each reinforcement was embedded in the center of the specimens. Flexural specimens repaired without reinforcement were prepared as controls. Specimens were subjected to 50,000 thermocycles (4 approximately 60 degrees C, 1-minute dwell time). A 3-point flexural test was carried out by loading the center of the repaired site at 5 mm/minute crosshead speed with 50 mm span jig supports. The load necessary to cause fracture was recorded for each specimen. All data were statistically analyzed using ANOVA and the Bonferroni/Dunn test (alpha < 0.05). RESULTS: The average load to fracture of specimens repaired with nonreinforced autopolymerizing resin was 68.4 N after 50,000 thermocycles. Specimens reinforced with 1.2 mm diameter stainless steel wire exhibited the highest value (89.8 N). The value for specimens reinforced with 1.2 mm diameter Co-Cr-Ni wire was 86.6 N. These fracture loads were significantly higher than those for specimens without reinforcement (p < 0.05). Low elasticity reinforcement, such as pure titanium wires, woven metal wire, and woven glass fiber were not effective in increasing the load to fracture values of flexural specimens. CONCLUSIONS: Specimens reinforced with 1.2 mm diameter stainless steel wires or Co-Cr-Ni wires resulted in significantly higher loads to fracture as compared to specimens without reinforcement. The use of pure titanium wire, woven metal wire, and woven glass fiber did not improve the fracture loads.

Acrylic Resins↗
PubMed1997

Glass fiber reinforcement in repaired acrylic resin removable dentures: preliminary results of a clinical study.

The clinical usefulness of continuous E-glass partial fiber reinforcement of acrylic resin removable dentures was evaluated an average 13 months after the insertion of the fibers. Twelve removable complete dentures and ten removable partial dentures with a history of recurrent fracture were selected for this study. The partial fiber reinforcement was incorporated into the denture at the time of repair. One complete denture and one removable partial denture fractured in the region of reinforcement during the examination period. These fractures were most likely caused by faulty placement of the fiber reinforcement in the denture in the dental laboratory. In six dentures, new fractures occurred in regions without partial fiber reinforcement. The results revealed the importance of both the correct positioning of the partial fiber reinforcement in the denture and the use of accurate laboratory techniques.

Acrylic Resins↗
PubMed1999

Indexing procedures for converting removable partial dentures after extractions while the patient retains the prosthesis.

A new indexing procedure is described for the conversion of removable partial dentures when extraction of additional teeth is planned. Advantages and disadvantages of the indexing procedure are reviewed and compared with traditional treatment options. The new procedure facilitates the use of dental laboratory expertise and facilities and allows the patient to retain the prosthesis throughout the process. A component that includes teeth, denture base segments, and wire or cast clasps is created by the laboratory and attached by the dentist during the extraction visit as a simple denture repair procedure. The procedure can also be used to convert an existing partial denture to an immediate complete denture. Required clinical and laboratory procedures are described.

Acrylic Resins↗
PubMed1994

[Distal free-end removable partial denture fabrication in reduced interarch distance patients].

Reduced interarch distance, resulted from extrusion of antagonist teeth and/or down growth of alveolar bone due to long-time absence of natural teeth without adequate restoration in this area, is found in many cases. In such condition, it is difficult to fabricate a distal free-end removable partial denture with conventional resin base because of insufficient space for denture base resin, metal framework and artificial teeth, and the long-term prognosis of the denture is questionable due to minimized strength of the denture base. In this article, the authors demonstrate the clinical and laboratory methods and procedures for distal extension removable partial denture construction in reduced interach distance condition. Partial metal base in the insufficient vertical space area of the ordinary denture base is altered, the metal occlusal scheme and buccal resin facing are designed, instead of resin denture teeth. These designs provide strength, esthetic and masticatory function to the denture, and the denture base is convenient for future denture repair or relining.

Denture Bases↗
PubMed2006

Effect of surface preparation using ethyl acetate on the repair strength of denture base resin.

OBJECTIVE: The objective of this study was to evaluate the effect of surface preparation using ethyl acetate on the repair strength of a denture base resin. MATERIAL AND METHODS: Bar specimens were fabricated with a heat-processed denture base resin and cut in half. The repair surfaces of the specimens were treated with ethyl acetate for varying amounts of time before the autopolymerizing repair resin was applied. The specimens were then immersed in 37 degrees C distilled water for 2 days. A three-point bending test was used to determine the transverse strength of the test specimens. Ten specimens prepared using a 120-s application of ethyl acetate and 10 specimens prepared using a 5-s application of dichloromethane were thermocycled at 10,000 cycles (at 5 degrees C and 55 degrees C) with a 60-s dwell time. The morphological changes in the repair surfaces after preparation were observed by scanning electron microscopy. RESULTS: The repair strength of the denture base resin prepared using ethyl acetate for 120 s (30.6 MPa) was the highest among the results for the various amounts of time tested (p<0.05). There were no significant differences between the repair bond strength both before and after thermocycling of the denture base resin prepared using ethyl acetate for 120 s and that of the denture base resin prepared with dichloromethane for 5 s (p>0.05). CONCLUSION: Within the limitations of the current study, a 120-s application of ethyl acetate was as effective as a 5-s application of dichloromethane at preparing the surfaces of a denture base resin.

Acetates↗
PubMed2005

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↗
PubMed2004

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↗
PubMed2005

Conversion of a removable partial denture to a transitional complete denture: a clinical report.

A procedure is described for conversion of an existing removable partial denture into a complete denture using autopolymerizing tooth-colored acrylic resin, acrylic resin denture repair material, and a clear matrix template. The shape, color, and position of the lost natural teeth may be duplicated in the transitional denture, minimizing the psychological concerns of the patient regarding esthetics and social impact. Because the patient is never without teeth, an appropriate healing time can occur before fabrication of the definitive prosthesis.

Dental Prosthesis Design↗
PubMed1983

Fabricating acrylic resin baseplates for complete dentures.

A technique for fabricating acrylic resin baseplates for complete dentures has been described. With this technique multiple sets of baseplates can be made at a time for a set of master casts. As with all polymethyl methacrylate resins, polymerization shrinkage is present. However, by using denture repair acrylic resin, shrinkage is minimized. Furthermore, when necessary, conventional procedures can be applied to stabilize the baseplates.

Acrylic Resins↗
PubMed1988

Oral disorders and treatment implications in people over 75 years.

The oral health of subjects over 75 yr and living independently in the southwest of Britain was assessed. The majority (80%) of the sample were edentulous, and a large proportion of both edentate and dentate subjects were using dentures. More than half of the denture wearers were using loose, very unhygienic, or structurally defective dentures. Mucosal pathoses were quite common, although most of the lesions were denture-induced stomatitis found in association with unhygienic dentures. The dentate subjects had, on average, 11 natural teeth, frequently with evidence of root caries and deep periodontal pockets or extreme bone loss. The oral health problems suggest that there is a significant need to develop effective methods of improving oral hygiene in this age group. The prosthetic treatment is related principally to denture repairs while there is a need to control root caries among the growing population of elderly dentate people.

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