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At least 1,279 records · Page 71Linked to original sources
PubMed2003

Tooth color: effects on judgments of attractiveness and age.

Tooth whitening has become a very popular procedure. Advertisements for whitening products imply that whiter teeth are more attractive than yellower teeth. We tested this idea empirically by manipulating the tooth color of pictures of male and female targets. Participants' ratings of attractiveness were not influenced by tooth color. Exp. 2 yielded a negative correlation between attractiveness and age ratings: targets judged to be older were rated as less attractive. Unless whiter teeth help in some other way, e.g., improved self-esteem or confidence, it seems that tooth whitening procedures or products are not associated with increased attractiveness to others.

Adult↗
PubMed1977

A comparison of the plaque-inhibiting effect of stannous fluoride and chlorhexidine.

A double blind clinical trial was undertaken in order to compare the plaque inhibiting effect of SnF2 (0.2% and 0.3%) with chlorhexidine (0.1%) applied as mouthrinses in a test panel of 12 dental hygienist students. The experimental series were performed in periods of four days. The mean Plaque Index values were 0.35 and 0.2 when employing SnF2 and 0.1 when chlorhexidine was used, whereas distilled water resulted in a mean value close to 1.0. The long-term effect of a 0.3% SnF2 solution was tested in another group of five students for a period of three weeks. The two trials confirmed previous reports claiming that SnF2 is effective as a plaque inhibitor and, furthermore, that this effect could be maintained for a period of at least three weeks. The staining problem was less than in similar studies using chlorhexidine.

Biguanides↗
PubMed2006

Staining of hybrid composites with coffee, oolong tea, or red wine.

This study examined the surface staining mechanism of a photopolymerized composite by coffee, oolong tea, and red wine. Dental composite was subjected to an experimental 24-hour staining cycle: 17-hour immersion in artificial saliva solution containing 0.3% mucin followed by 7-hour immersion in coffee, tea, or wine. After one, two, and four weeks, digital images of the composite surface were analyzed in grayscale mode with an imaging analyzer. Specimens polished but not immersed were used as a baseline measurement for color change. Additionally, the effects of mechanical brushing and chlorhexidine on drink-induced staining were examined. Wine caused the most severe staining, followed by tea and coffee. After four weeks of immersion, brushing reduced surface staining by wine. On the contrary, chlorhexidine increased the staining effect of tea and coffee (p<0.05) when compared to the control specimens. In conclusion, we showed that common drinks stained the dental composite, but each by a specific mechanism that depended on external conditions such as the presence of chlorhexidine.

Acrylic Resins↗
PubMed2006

Relationship between colors of carious dentin and laser fluorescence evaluations in caries diagnosis.

This in vitro study investigated the relationship between assessments of dentin caries using a laser fluorescence device (DIAGNOdent) and a caries detector dye during caries removal. The dentin of eight extracted carious molars was removed at 300-microm interval points from the dentin surface toward the pulp chamber. Before and after each removal, images of the carious surfaces were taken in association with color-matching stickers (for color correction) and the surfaces were evaluated by DIAGNOdent based on fluorescence emission from the tooth surface. For the L* values (CIE 1976 L*a*b* color system), there was a strong negative correlation between DIAGNOdent results and the corrected L* values of the carious surfaces (Pearson's correlation coefficient: -0.853); additionally, there was a significant correlation between them (p<0.05). However, there were no significant correlations between the DIAGNOdent results and the corrected a* and b* values of the carious surfaces (Pearson's correlation coefficients: 0.108 and 0.018 respectively). In conclusion, DIAGNOdent was shown to be applicable for caries diagnosis during caries removal.

Coloring Agents↗
PubMed2005

[The questionnaire survey on oral malodor and teeth stains of male high school students].

This study investigated the oral health awareness of aesthetic problems among adolescents. In 2002, a questionnaire survey on oral malodor and teeth stains was conducted at a junior and senior high school for males in Tokyo. The subjects were 783 students. The following results were obtained. (1) The rate of students who were concerned about other persons' oral malodor was significantly higher for the students in the senior high school than in the junior high school. The attitudes toward oral malodor varied depending on whether the target was family or friends. (2) Forty percent of junior high school students and first-year senior high school students answered that they had been conscious about their oral malodor. The rate was 60% for second- and third-year senior high school students. There was a significant difference between the two groups. (3) Thirty-five percent of the students who were conscious about their oral malodor felt some difficulties in daily life such as communication with other persons. (4) Fifty percent of the students replied that they had been conscious about their teeth stains. However, most of them felt no difficulties in daily life. From these results, it was revealed that almost half of the junior and senior high school students had been concerned about oral malodor and teeth stains. It is necessary to provide adequate dental health education on oral malodor and teeth stains for students through school oral health promotion activities as well as in dental clinics.

Adolescent↗
PubMed1987

Effects of diets containing sodium fluoride on mink.

Mink (Mustela vison) kits still nursing, and adult male mink were fed diets containing various levels of fluorine (as NaF) to determine the effects on health, growth and pelt quality. Different groups were fed diets containing 25.5 (control), 46.0, 111.5 or 287.0 ppm fluorine (on a wet basis) for 7-8 mo. Gross, radiographic and microscopic changes were seen in bones from some animals ingesting the higher levels of fluorine. Chemical analyses for fluorine generally reflected levels ingested. Fluorine caused no detectable differences in pelt quality. After data were evaluated, tolerance levels in the feed of not more than 50 ppm fluorine for breeding stock and 100 ppm fluorine for animals being raised only for pelts are recommended.

Animals↗
PubMed1998

An innovative direct technique for resin composite veneers for teeth with color alterations.

An alternative technique for fabricating resin composite veneers for teeth with color alterations is presented. The technique is based on research carried out with a silica derivative (coesite). The veneer is applied directly to the mouth. The objective of the technique is to provide greater translucence to the teeth, resulting in a better imitation of the natural appearance.

Composite Resins↗
PubMed1998

Long-term prognosis of intentional endodontics and internal bleaching of tetracycline-stained teeth.

A total of 112 severely tetracycline-stained teeth in 20 patients were treated by endodontics and nonthermal internal bleaching. All teeth were healthy, intact, and had no history of trauma. The patients were monitored for 5 to 15 years. Excellent, permanent esthetic results were obtained with no side effects. The quality of endodontic treatment and lingual access restoration were important factors in the longevity of the bleaching results.

Adult↗
PubMed1999

Hereditary ochronosis: hyperpigmented skin overlying cartilaginous structures.

Hereditary ochronosis, or alkaptonuria, results from deficiency of homogentisic acid oxidase. It is an autosomal recessive condition found in geographically isolated populations. The excess homogentisic acid deposits in collagenous structures, leading to unusual pigmentation of the skin overlying cartilaginous structures, but on occasion pigment is also seen in the sclera, in sweat after oxidation, and classically, in urine when left standing at room temperature. This case report highlights the pathogenesis and expression of this rare disorder.

Adult↗
PubMedDate not supplied

Enamel staining and hypoplasia due to multiple causes in a Nigerian adolescent: report of a case.

The aim of this report is to discuss the effects of childhood drug ingestion and metabolic disturbances of ill health in childhood on the coloration, structure and therefore the aesthetics of permanent dentition. To illustrate this, the report presents a case of a 15 year old Nigerian girl with combined tetracycline staining and chronological enamel hypoplastic defects on her teeth. The relationship between the clinical appearance of her teeth and her childhood medical and drug history are analysed. The various treatment modalities available for the management of the dental anomalies are discussed along with the rationale for the treatment given. Strategies for the prevention of these conditions are emphasised.

Adolescent↗
PubMed1998

Preliminary report: laboratory-induced stain removal as assessed by environmental scanning electron microscopy.

Environmental scanning electron microscopy (ESEM) was employed to observe stain removal during brushing with Arm & Hammer Dental Care and Crest Regular Toothpaste. ESEM allows serial examinations of the same sample, and does not require a destructive preparative process. Three extracted molars were cleaned, placed into a 96-hour broth culture of Streptococcus mutans, and stain was produced with undiluted chlorhexidine rinse, concentrated coffee and tea for a period of 23 days. After staining, the teeth were examined by ESEM, then brushed using a toothbrushing machine. Imaging was repeated after 5, 10, 15 and 30 seconds of brushing. As seen with ESEM, the Arm & Hammer product had different effects than those from the distilled water control, suggesting something other than that expected from abrasive and mechanical forces alone. There were also differences from the Crest dentifrice removal on this single sample, suggesting a possible difference between the two products. Further studies are needed to confirm and explain these effects.

Chlorhexidine↗
PubMed1998

A longitudinal comparison of tooth whitening resulting from dentifrice use.

The effect of twice-daily brushing with one of three different dentifrices (Arm & Hammer Dental Care, Arm & Hammer Dental Care Extra Whitening, Crest) on stain removal and tooth whitening was examined in 115 volunteers over a period of 12 weeks. The facial surfaces of 12 anterior teeth were assessed for stain using a published, modified version of a standard stain index. Whiteness was measured on teeth 8 and 9 using a single Vita Lumin-Vaccum Shade Guide for consistency. At baseline, the mean facial stain scores were significantly higher (p < 0.05-0.01) for both Arm & Hammer dentifrices than for Crest. In addition, the tooth shades, as indicated by the stain guide, specifically the b* values representing yellowness, were quantified using a Minolta spectrophotometer. Arm & Hammer Dental Care Extra Whitening formula was found to be significantly better than Crest at removing naturally occurring extrinsic stain. The difference between Arm & Hammer Dental Care Extra Whitening and Crest became significant (p < 0.01) after two weeks of use, and remained intact during the balance of the study, achieving p values of 0.0002 for at least one of the three assessed parameters (total stain, proximal, and facial) at weeks 4 and 12. The study also found that Arm & Hammer Dental Care produced a significant increase in tooth whiteness by week 12, whereas Crest showed no such increase at any time during the study. These results suggest that the two Arm & Hammer Baking Soda products are more effective in reducing stain and increasing whiteness than the standard silica-based dentifrice. Their effectiveness is not related to abrasivity since they are less abrasive to tooth enamel than the silica-based product tested.

Adolescent↗