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At least 397 records · Page 22Linked to original sources
PubMed1976

Oral signs of aging and their clinical significance.

A look in the patient's mouth can give clues to his overall health. For instance, atrophic glossitis--or breakdown of the tongue's papillary structure--reveals that there may be incomplete absorption of vitamin B complex or some other nutritional deficiency. Tenderness and impaired motion in the jaw can mean any of a number of problems related to other joints of the body. Osteoarthritis is often to blame. Or the disablement may be due to rheumatoid arthritis or to sclerosis of joint surfaces. Atrophy of the alveolar bone, which progresses slowly during normal aging, is speeded up in persons with osteoporosis. Even after all teeth are gone, bone loss continues. It's likely to be excessive and uneven, and the resultant sharp ridges and spicules sometimes cause so much pain and irritation that the patient can't tolerate dentures.

Adult↗
PubMedDate not supplied

A clinical investigation on three-unit fixed partial dentures fabricated with a lithium disilicate glass-ceramic.

A lithium disilicate glass-ceramic material has recently been developed for the fabrication of 3-unit fixed partial dentures. Conducted on 60 restorations, this initial trial attempted to define clinical indications and establish design principles for fixed partial dentures fabricated of this ceramic material. The design requisites varied depending on placement on the arch, and the authors concluded that lithium disilicate restorations caused reduced antagonist structure or opposing tooth wear. This investigation demonstrated that when a novel ceramic system was utilized for 3-unit restorations replacing up to the first premolar and attained minimal criteria for connector dimensions, an acceptable clinical success rate was achieved.

Adult↗
PubMedDate not supplied

Two-year clinical performance of a resin-modified glass-ionomer restorative material.

This study was a 2-year clinical evaluation of a conventional and a resin-modified glass-ionomer restorative material. Thirty-four restorations each of Ketac-Fil and Photac-Fil were placed without tooth preparation in cervical abrasion/abfraction lesions, primarily in premolar teeth. Patients ranged in age from 30 to 73 years, with a median age of 45 years. Isolation for the restorations was accomplished with cotton rolls. Restorations of both materials were retained at the rate of 93%, and both were comparable in appearance, receiving Alfa ratings for more than 85% of the restorations. One occurrence of secondary caries was observed for each material. No significant difference between the materials was observed for any evaluation category (exact binomial test, P > 0.05).

Adult↗
PubMed1999

In vitro evaluation of four adhesive materials in the treatment of cervical lesions.

BACKGROUND: The aim of this study was the evaluation of four adhesive restorative materials regarding the possible microleakage along margins of cervical lesions (class V lesions). METHODS: The comparative in vitro experience was performed in 24 healthy inferior human molars previously extracted and stored in saline. We realized 24 class V lesions with standard dimensions, occlusal margins placed in enamel, cervical margins placed in dentin/cement. The teeth were randomly divided into four groups (six each) and were filled with two light-cured glass ionomer cements (Fuji II LC and Fuji II LC Improved-GC) and with two enamel-dentin adhesive systems/composite resins (Scotchbond MP-3M-/Enamel Plus-Mice-rium-; Prodigy/Optibond-Kerr). All materials were treated according to manufacturers' instructions. After thermocycling the restorations were placed in 2% methylene-blue aqueous solutions for 24 hours. Then we performed a SEM observation of the surface of margin restorations and a light-microscopy observation, after longitudinal section of specimens, to evaluate the marginal infiltration of the colouring solution. RESULTS: We submitted to statistical analysis the results of the light-microscopy observation. Differences in microleakage scores between materials were compared using Kruskall Wallis test. Although higher values of dye penetration were found at gingival margins all groups showed minimal microleakage. No statistical significative differences were seen between materials. Our results are in agreement with those of present in recent literature. CONCLUSIONS: On the basis of our results we can state that the treatment of cervical lesions is a safe and predictable clinical procedure either using light-cured glass ionomer cements or composite resins. Clinicians must take particular care of gingival margins of these lesions.

Composite Resins↗
PubMed1999

1-year clinical evaluation of Compoglass and Fuji II LC in cervical erosion/abfraction lesions.

PURPOSE: This study was undertaken to compare the clinical performance of a polyacid-modified resin-based composite and a resin-modified glass-ionomer restorative material over 1 year. MATERIALS AND METHODS: Thirty-four pairs of restorations of Compoglass (C) and Fuji II LC (F) were placed in 31 patients, with no patient receiving more than two pairs, and with materials assigned at random within the pairs. Caries-free cervical erosion/abfraction lesions of the facial surface were restored without tooth preparation according to manufacturers' instructions, except that tooth structure to be restored was etched with 37% phosphoric acid prior to placement of Compoglass. Restorations were clinically evaluated by two blinded examiners at baseline, 6 months, and 1 year, using modified Ryge/USPHS criteria. Restorations receiving a score of "Charlie" in either retention or secondary caries were classified as failed restorations. The incidence of failures was statistically analyzed as a pairwise comparison, using an exact binomial test. RESULTS: Thirty-one pairs of restorations were available for recall at 1 year. The percentage of Alfa scores for each material in each category were: Retention (C = 84%, F = 100%), Color match (C = 81%, F = 100%), Marginal discoloration (C = 78%, F = 97%), Secondary caries (C = 88%, F = 100%), Anatomic form (C = 92%, F = 100%), and Marginal adaptation (C = 26%, F = 46%). Except for the failed restorations, no other Charlie scores were assigned. A significant difference in the incidence of failed restorations was found between the materials (P = 0.01).

Adult↗
PubMedDate not supplied

A difference in perspective--the North American and European interpretations of tooth wear.

PURPOSE: There is considerable interest in the European dental research literature about the problem of tooth wear and specifically about dental erosion, but this interest does not appear to be matched in North America based on the volume of the literature there. The purpose of this article is to consider the possible explanations for this difference. MATERIALS AND METHODS: This article examines the reasons for this disparity and attempts to explain the difference by reviewing the North American and European literature on the etiology, pathogenesis, and prevalence of tooth wear. RESULTS: It would appear from the literature that the reason for the difference in interest between the 2 continents is a reflection of how the appearance, etiology, and terminology are interpreted and used to define tooth wear, attrition, and erosion. CONCLUSION: Attrition is the wear of teeth against teeth; therefore, by definition any worn surface that does not contact the opposing tooth must have another etiology. An appropriate descriptive term is "tooth wear" when the etiology is multifactorial or cannot be determined. A search of the literature shows more studies in the European literature of the etiology and prevalence of tooth wear than in the North American literature. The thrust of the European studies supports the view that erosion is more important than attrition in the etiology of tooth wear.

Bruxism↗
PubMed1999

Evaluation of esthetic parameters of resin-modified glass-ionomer materials and a polyacid-modified resin composite in Class V cervical lesions.

OBJECTIVE: The purpose of this study was to compare the esthetics of 3 resin-modified glass-ionomer materials and 1 polyacid-modified resin composite to the esthetics of a conventional glass-ionomer control material. METHOD AND MATERIALS: One hundred eighty-seven Class V cervical restorations were observed clinically over 18 months. The esthetic index system that was used evaluated color match, translucency or opacity, and surface roughness. RESULTS: The tested materials behaved very dissimilarly and inconsistently. In general, the esthetic results of the resin-modified glass-ionomer materials and the polyacid-modified resin composite were far from optimal. The esthetic appearance of restorations seriously deteriorated during clinical service, mainly because of discoloration of margins, changes in translucency and opacity, and rapidly appearing roughness or dullness on the surface. Both the resin-modified glass-ionomer materials and the polyacid-modified resin composite evaluated in this study performed better esthetically than did the conventional glass-ionomer material. CONCLUSION: Indications for these combination materials are limited to areas where esthetics is not a primary concern but where their ease of application may guarantee a more durable functional result.

Acrylic Resins↗