An Abrasion Test for Composite Resins

Ehrnford, Lars; Dérand, Tore; Larsson, Lars-Ake; Svensson, Alvar

doi:10.1177/00220345800590040801

Cited by 37 publications

(23 citation statements)

References 10 publications

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“…Loss of anatomic form caused by wear can alter functions of the masticatory system. Other investigators used wear machines to simulate the chewing movements in the oral environment [6,[23][24][25]. However, there is no evidence to show that in vitro wear testing can predict the amount or pattern of clinical wear of enamel caused by ceramic prostheses.…”

Section: Discussionmentioning

confidence: 99%

“…Applied loads of 13.4 to 30 N at frequency of 4 Hz were used as clinically-relevant parameters. Vertical wear depth and area loss were also used to determine the amount of wear for restorative materials [23,[33][34][35]. The mean area increase of enamel varied from 0.16 to 0.82 mm 2 after 25,000 loading cycles at a load of 40 N [33].…”

Section: Discussionmentioning

confidence: 99%

“…The mean area increase of enamel varied from 0.16 to 0.82 mm 2 after 25,000 loading cycles at a load of 40 N [33]. The mean wear depth of enamel ranged from 0.23 to 1.19 mm after 10,000-100,000 loading cycles at a load of 4-40 N [23,[34][35]. The mean wear depths of porcelain varied from 3.7 to 74 μm.…”

Section: Discussionmentioning

confidence: 99%

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Clinical performance and wear characteristics of veneered lithia-disilicate-based ceramic crowns

et al. 2008

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Objectives-The objectives of this study were to characterize the clinical performance and wear characteristics of lithia-disilicate-based ceramic crowns.Methods-Thirty posterior crowns were made using the heat-pressing technique and lithiadisilicate-based core ceramic. Subjects were recalled annually. The quality of crowns and adjacent gingival tissues were examined using nine criteria for acceptability. All crowns were examined and ranked from 4 (Excellent) to 1 (Unacceptable) for each criterion. Impressions were made for replica models at each appointment. Wear characteristics of dental ceramic and enamel were obtained by comparing the surface of the original model with the follow-up model using a laser scanner.Results-Twenty nine subjects returned for the one-year recall examination. The maximum clenching force for the 30 subjects ranged from 125 to 815 N. All clinical criteria were ranked good to excellent at the one-year recall exam and no fractures were observed. The mean occlusal wear volumes for the ceramic crowns after one year were 0.19 (0.065) mm 3 for premolar sites and 0.34 (0.08) mm 3 for molar sites. The mean occlusal wear volumes of opposing enamel after one year were 0.21 (0.06) mm 3 for premolar teeth and 0.50 (0.22) mm 3 for molar teeth. The mean occlusal wear volume of ceramic molar crowns was significantly lower than the volume of enamel wear of the opposing teeth (p≤0.05).Conclusions-The quality of the overall prostheses and the gingival tissues were acceptable after one year. The mean occlusal wear volume of ceramic molar crowns was significantly lower than the enamel wear volume of the opposing teeth.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Clinical performance and wear characteristics of veneered lithia-disilicate-based ceramic crowns

et al. 2008

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“…Accelerated laboratory tests are available. [21][22][23][24][25]41,42 While these tests have been useful in studying fundamental mechanisms of wear, they have not been able to predict clinical wear. 7,14 One possible reason for this difficulty, we have suggested, is that environmental degradation has not been taken into consideration in the design of most in vitro wear tests.…”

Section: Discussionmentioning

confidence: 99%

“…For instance, an aqueous environment is used in many laboratory wear tests. [21][22][23][24][25] In these tests, the contact time of resin composites with water is too short to produce a degraded layer, which is so essential for the operation of corrosive-wear. 26 Not even a prolonged exposure of 24 months has been successful in causing filler debonding characteristic of in vivo wear.…”

Section: Introductionmentioning

confidence: 99%

Internal corrosion in dental composite wear

Sarkar

2000

J. Biomed. Mater. Res.

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The internal corrosion of dental resin composites is associated with water-sorption and leads to (1) interfacial debonding, (2) filler dissolution, (3) matrix cracking, and (4) subsurface damage. The last factor creates a condition for "corrosive-wear" in which the damaged layer is worn with ease exposing a new surface and perpetuating the cycle of corrosion and wear. Central to the simulation of in vivo corrosive-wear is the recreation of the subsurface damage layer. To produce this layer in water, artificial saliva, and in media of low pH is time-consuming, because the degradation process in these environments is extremely slow. In laboratory wear tests using aqueous environments, the contact time of resin composites with water is too short to cause significant internal degradation. Thus, data obtained from such tests represent abrasive and not corrosive-wear, and do not correlate well with in vivo wear data. In considering this limitation of the above media for accelerated wear tests, an alkaline medium has been used in this study to simulate corrosive-wear of eleven commercial composites. The procedure consists of exposing each material to 0.1 N NaOH at 60 degrees C for 2 weeks followed by abrasion in a tooth brushing machine. The medium choice is based on the rationale that in vivo degradation arises from reaction with the OH(-), and this reaction can be enhanced by raising the pH and the temperature of the medium. The warm NaOH solution satisfies both these conditions. Parameters examined to evaluate the resistance of each composite to corrosion and wear were (1) mass loss, (2) Si-loss, (3) degradation depth, and (4) wear depth, respectively. A highly significant correlation has been observed among various corrosion and wear parameters. SEM examination indicated degradation to be associated with interfacial separation, filler dissolution, matrix cracking, and subsurface damage. These features are characteristics of in vivo worn composite restorations. Time is of utmost importance in laboratory evaluation of restorative materials. The ability of NaOH to meet this expediency and to mimic the in vivo degradation process makes it a useful medium for corrosive-wear studies of dental composites.

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