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At least 1,081 records · Page 60Linked to original sources
PubMed1984

An international collaborative study of laboratory methods for assessing abrasivity to dentin.

An International Collaborative Study was conducted in which one surface profile and two radiotracer methods for assessing abrasivity of dentifrices on human dentin were compared. The study consisted of two phases: an open phase in which participating laboratories used the method they routinely practiced; and a controlled phase in which an expert team for each method performed the abrasion tests using all three methods. Four test pastes of known abrasivity were evaluated by each method. Similar abrasivity values for the test pastes were obtained with the radiotracer methods, whereas the surface profile method produced significantly different values. The precision levels of the radiotracer methods were similar, and both were superior to those obtained by the surface profile method. The time needed to perform the tests by the ADA radiotracer method was significantly less than that needed by the other methods. These findings suggest that the ADA radiotracer method will be useful in assessing abrasivity of dentifrices.

Calcium Carbonate↗
PubMed2005

[Contributions of dentistry to physical anthropology: example of the medieval cemetery of Coxyde].

The role of the odontologist is crucial for the study of archaeological material. The excavations at the site of the ancient abbey of the Dunes of Koksijde led to the discovery of more than a thousand burial places. It is possible to estimate the age of the skeletons by studying molar dental wear. This method is however less appropriate for the industrialised populations of the 21st century, because of the switch to more diverse and processed (less abrasive) food.

Adolescent↗
PubMed1989

[Enamel wear from ceramic and stainless steel orthodontic brackets].

The purpose of this investigation was to examine the potential enamel wear upon contact with ceramic and stainless steel orthodontic brackets of the same company into an artificial mouth, which is a simulated oral environment. Two groups of ten lower premolars were bonded with ceramic and stainless steel brackets. The same number of upper premolars were used and each upper premolar was brought in contact with the opposing bracket and subjected to a lateral type of movement, like a mastication movement, by the artificial mouth. A constant load of approximately two pounds was used for the masticatory force, the rate of chewing was one cycle per second and the teeth were subjected to 2.5 and 10 masticatory cycles. The before and after occlusal surfaces of the upper premolars were compared using a computerized profiling system and the enamel volume loss was calculated. Qualitative changes, such as rate of enamel wear, were examined visually using SEM and computer graphics. Abrasion scores (mean +/- SD) in mm3 were 0.0142 +/- 0.020 for the metal and 0.2433 +/- 0.150 for the ceramic brackets and were significantly different at p less than 0.05. Ceramic brackets caused significantly greater enamel abrasion than stainless steel brackets.

Bicuspid↗
PubMedDate not supplied

[Influence of noise and vibrations on teeth abrasion].

The purpose of the investigation was to determine the influence of noise and vibrations on teeth abrasion in textile workers. For testing purposes a random sample of 115 workers who were exposed to 99-105 decibels of noise, was selected. After thorough investigations it was found that noise was a detrimental stress--producing factor causing quite a number of diseases. Noise can be a stress-producing factor causing parafunctions. The parafunctions are a major aetiological factor that causes teeth abrasion. These investigations proved the correlation between the duration of noise and exposure to vibrations and patological abrasion of hard teeth tissues. The teeth abrasion was more frequent in textile workers who were long exposed to high level of noise.

Adult↗
PubMed2005

Wear of dentine in vitro by toothpaste abrasives and detergents alone and combined.

AIM: To measure in vitro the abrasion of dentine by toothpaste detergents and abrasives alone and combined. MATERIALS AND METHODS: Detergents used were tego betain, sodium lauryl sulphate (SLS), adinol and pluronic diluted to 1% w/v. Abrasives were three artificial silicas, tixosil 73 and 123 and Zeodent 113, and calcium carbonate used at 2.5% w/v. Flat human dentine specimens were brushed with aqueous detergent solutions or abrasive slurries, detergent abrasive slurries and water for 20,000 brush strokes. Dentine loss was measured by non-contacting profilometry at 10,000 and 20,000 strokes. Silica particle size distribution was measured by laser deflection. RESULTS: Loss of dentine occurred with all detergents, abrasives and detergent abrasion combinations, but was not linear with number of brush strokes. Water appeared to remove the smear layer only, but all detergents exceeded the predicted smear layer thickness. The silica abrasives differed in abrasion properties despite similar particle size distribution. Different detergents modulated the abrasives actions in mainly positive or mainly negative directions. CONCLUSIONS: Detergents appear able to attack the dentine surface to produce wear. Abrasives vary considerably in wear produced under similar conditions. Detergents modulate the effect of abrasives in a way that may reflect the rheological properties of the mixture.

Adolescent↗
PubMed1978

[The resistance to abrasion of dental materials].

Using a new method, the authors investigated the abrasion resistance of Kallocryl-A with regard to the kind of stress (abrasive or intermittent), the temperature, the depth of the layer of plastic and the number of abrasive movements. The results were analysed for significance by means of the t-test.

Dental Materials↗
PubMed2005

In vitro toothbrush-dentifrice abrasion of two restorative composites.

BACKGROUND: Surface wear can be a problem with directly placed composites. PURPOSE: This study evaluated the in vitro wear and surface roughness of two composites at different cycle intervals after being subjected to toothbrush-dentifrice abrasion. MATERIALS AND METHODS: Twenty specimens of a microhybrid, Filtek Z250 (3M ESPE, St. Paul, MN, USA), and a nanofill composite, Filtek Supreme (3M ESPE), were prepared according to the manufacturer's directions. Each specimen was subjected to toothbrush-dentifrice abrasion (250 g vertical load) using a deionized water-dentifrice slurry (Close-Up, Lever Ponds Ltd., La Lucia, ZA) and toothbrush heads (Oral-B 40, Oral-B Laboratories, Delmont, CA, USA). A brushing sequence of 10,000, 20,000, 50,000, and 100,000 strokes was performed for all samples at a rate of 1.5 Hz. At baseline and each cycle interval, a surface profilometer was used to determine average surface roughness, Ra. At the same intervals, vertical loss of material was measured with a precision micrometer. Data were analyzed using repeated-measures analysis of variance at p value .05. Analyses with atomic force microscopy (AFM) and scanning electron microscopy (SEM) were also performed. RESULTS: After 20,000, 50,000, and 100,000 cycles, Filtek Supreme showed less significant wear than Z250. Filtek Supreme demonstrated higher surface roughness than Z250 after 50,000 and 100,000 cycles. However, AFM and SEM images indicated a more uniform surface topography for Filtek Supreme than for Z250. Abrasion wear and surface roughness increased with each cycle interval for both materials. CONCLUSIONS: Although the initial performance of both materials was similar, a greater number of brushing cycles revealed differences between the wear resistance and generated surface roughness of the materials. CLINICAL SIGNIFICANCE: The wear resistance and roughness results of Filtek Supreme suggest that it is suitable for clinical use, mainly in areas that are more subject to abrasive wear, such as Class V restorations.

Acrylic Resins↗
PubMedDate not supplied

[Pathologic abrasion].

By "pathologic abrasion" is defined the excessive loss of the hard dental substance, which may lead to a total removal of the anatomic crown. This is one of most severe affections of ADM but also one of the best tolerated for a certain length of time. Four aspects of abrasion are frequently noted:--helicoidal abrasion--ad palatum abrasion;--horizontal abrasion;--keylock type abrasion. Excessive abrasion is due to bruxisme in most of the cases, and also to diet, but to a lesser extent. In most of the patients DVO is not modified because, as abrasion persists the continuous process of dental eruption, as well as of the alveolar processes develops. This is the reason for which it has been concluded that DVO should not be removed by prosthetic therapy in patients with extreme abrasion. The most simple solutions should be selected, avoiding complicated therapies because "the ideal treatment" is not always successful for a long time.

Humans↗
PubMed1996

Clinical evaluation of a filled adhesive system in Class 5 restorations.

The restoration of the Class 5 lesion has proved to be an excellent model to measure the clinical efficacy of dentin adhesive materials. This is the result of numerous factors, such as the nonretentive nature of the lesion, large areas of exposed dentin with limited enamel margins, and the high degree of flexure from occlusion that is transmitted to the restoration. The role of the adhesive agent has been critical to the successful restoration of the lesion. Numerous improvements have been introduced to correct deficiencies of earlier-generation bonding systems. The addition of filler particles to the resin adhesive has provided significant benefits, especially in marginal adaptation. The clinical performance of OptiBond, a filled dentin adhesive system, was investigated through the restoration of 80 Class 5 abrasion lesions in 35 patients in accordance with the Guidelines for Dentin and Enamel Adhesive Materials of the American Dental Association. At 2 years, all clinical evaluation parameters were rated 94% to 100% alpha. OptiBond has demonstrated therapeutic effectiveness in eliminating the dentin hypersensitivity that often occurs in Class 5 abrasion lesions.

Adult↗