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At least 127 records · Page 7Linked to original sources
PubMed1993

Evaluation of two dentin adhesives in cervical lesions.

The clinical effectiveness of two dentin adhesives, Clearfil New Bond and Scotchbond 2, was evaluated in two different cavity designs. Group A was without enamel bevel or acid etch and with a butt-joint cavity; and group B had enamel bevel, acid etch, and feather-edged cavities. The retentive rate and marginal adaptation were monitored for 2 years. In the Clearfil system, 21% of group A restorations failed after 2 years, whereas virtually all the group B restorations (99%) were retained. In addition, after 2 years, the total of debonded group A restorations in the Scotchbond 2 system expanded to 13%, whereas no restorations from group B were lost. There was clearly marginal deterioration in time irrespective of the bonding system. Nevertheless, the marginal adaptation of cervical lesions restored with Clearfil New Bond adhesive in combination with Clearfil Ray composite resin revealed fewer defects compared with the Scotchbond 2 adhesive with Silux Plus composite resin restorations. SEM evaluation disclosed composite resin remnants on the dentin surface in cavities with lost fillings, which indicates partial cohesive failure of the adhesive joint.

Composite Resins↗
PubMed2004

Influence of buffering effects of dentifrices and fluoride gels on abrasion on eroded dentine.

OBJECTIVE: Evaluation of abrasion resistance of eroded and non-eroded dentine brushed with experimental dentifrices and gels of varying buffering capacities. DESIGN: One hundred and twenty human dentine specimens were distributed among six groups (A-F) according to the different buffering capacities of experimental toothpastes and gels. The dentifrices (pH: 4.5) and gels (pH: 4.5) differed in fluoride content, RDA-value and buffer capacity (given as mg KOH needed for neutralisation): (A) 0.125%F, RDA: 77, 6mg KOH; (B) 0.125%F, RDA: 125, 24mg KOH; (C) 0.125%F, RDA: 129, 12mg KOH; (D) 0%F, RDA: 81, 1.55mg KOH; (E) 1.25%F, RDA: 21, 8.5mg KOH; (F) 0.125%F, RDA: 7, 3.11mg KOH. Ten specimens were cycled through three alternating demineralisations (1% citric acid, 5min) and remineralisations (artificial saliva, 1min) including brushing abrasion in an automatic brushing machine (2 x 2000 strokes). Ten samples of each group were not eroded, but only brushed. RESULTS: After three cycles, loss of dentine was determined by profilometry (mean +/- S.D. [microm]). Eroded samples: (A) 37.12+/-4.95; (B) 48.67+/-4.77; (C) 39.88+/-3.76; (D) 32.92+/-2.67; (E) 3.65+/-1.35; (F) 6.47+/-1.31. Uneroded samples: (A) 30.78+/-6.47; (B) 37.84+/-7.75; (C) 30.07+/-3.05; (D) 26.93+/-2.30; (E) 1.76+/-0.94; (F) 0.51+/-0.18. Analysis of variance revealed significantly higher abrasion values for the eroded compared to the non-eroded samples (P<or=0.05). Dentifrices with same pH-value, fluoride content and similar RDA-values but a higher buffering capacity exhibited significantly more abrasion than toothpastes with lower buffering capacity. Highly-concentrated fluoride gel with higher buffering capacity lead to less abrasion values compared to the gel with low fluoride concentration and low buffering capacity. CONCLUSION: Toothbrushing abrasion behaviour of eroded dentine may be influenced by the fluoride content, RDA-value and buffering capacity of the applied dentifrice or gel.

Buffers↗
PubMedDate not supplied

Effect of restored and unrestored non-carious cervical lesions on the fracture resistance of previously restored maxillary premolar teeth.

OBJECTIVES: The effect of non-carious cervical lesions (NCCL) on tooth fracture resistance has not previously been investigated. The aims of this in vitro study were to examine the fracture resistance of a group of extracted maxillary premolar teeth with mesio-occlusal-distal (MOD) restorations of amalgam, and restored or unrestored simulated NCCL. METHOD: Forty sound maxillary, premolar teeth were divided at random into four groups, each of 10 teeth, which were fixed crown uppermost and long axis vertical in stainless steel moulds. Groups 1,2,3 and 4 were prepared with standardized parallel-sided MOD cavities, then restored with amalgam. Groups 1, 2 and 3 were further prepared with standardized NCCL. The NCCL in Group 1 were restored using a resin-modified polyalkenoate (glass-ionomer) cement, and the NCCL in Group 2 were restored with an adhesive composite resin system. The NCCL in Group 3 were left unrestored. The specimens were loaded compressively at 1 mm min-1 using a universal testing machine. RESULTS: Mean fracture loads (KN) of 1.08, 1.03, 0.98 and 1.14, respectively, were recorded for Groups 1, 2, 3 and 4. Two-way ANOVA and Scheffe's Multiple Range Test showed no statistically significant difference between the groups. CONCLUSIONS: It is concluded that the presence of a standardized NCCL in an extracted maxillary premolar tooth does not reduce the fracture resistance of the tooth when loaded compressively at 1 mm min-1. The restoration of NCCL with the materials tested did not result in an increase in the fracture resistance of the previously restored premolar teeth, when loaded compressively at 1 mm min-1.

Analysis of Variance↗
PubMed2003

Analysis of etiologic factors and periodontal conditions involved with 309 abfractions.

OBJECTIVES: Non-carious cervical lesions (NCCL), also termed abfractions, have long been thought to be produced by excessive brushing. Nearly 20 years ago an occlusal etiology was proffered (Lee & Eagle 1984). Controversy still exists concerning these two concepts. The present work was carried out to verify the occurrence of signs of excessive brushing or occlusal disturbances associated with abfractions. MATERIAL AND METHODS: All first consultants were screened for the presence of abfractions during one trimester. NCCL were found in 61 patients who consequently received a thorough examination searching for clinical evidence of excessive brushing or occlusal disturbances. The presence of plaque, calculus, periodontitis, or mobility was also noted. Simple frequency and percentage were used to describe the occurrence of different clinical signs in association with the presence of abfractions. RESULTS: Abfractions often exist in mouths presenting plaque (40.1%), calculus (41.7%), or periodontitis (20.4%). Ulceration of the gingiva is a rare finding (1.6%). However, subgingival apical limits were frequent (32.5%). NCCL coexist almost systematically with occlusal wear facets (94.5%). Lack of canine disclusion (77.2%) was also closely associated with the presence of abfractions. Conversely, mobility was seldom found (1.9%). CONCLUSIONS: Clinical signs of excessive brushing were lacking, whereas signs of occlusal disturbance were very consistent with the presence of abfractions.

Adult↗
PubMed2003

Essential oil mouthwashes: a key component in oral health management.

This Supplement provides clear evidence that essential oil (EO) mouthwashes can be a beneficial, safe component of daily oral health routines. However, despite the wealth of supporting evidence, several issues are worthy of discussion. Patient compliance is a clear issue with oral home-care routines, and the emphasis is on dental professionals to communicate the importance of adherence. The reasons for each step of the oral-care routine (i.e. brushing, flossing, rinsing) should be clearly explained, and if required, additional motivation should be provided. Most mouthwashes contain denatured alcohol as a delivery vehicle, and some concern has been raised about the association of alcohol with oral cancer. However, a review by the Food and Drug Administration and American Dental Association found that the supporting evidence to date is inconsistent and contradictory. Some mouthwashes have a pH below 5.5, and some researchers believe that this can lead to tooth erosion. Studies have shown that although the pH of an EO mouthwash is below 5.5, salivary pH remains above 5.5 following rinsing and for 15 min postrinse.

Anti-Infective Agents, Local↗
PubMed1999

Removable prostheses.

Reconstruction of the dentition extensively damaged through tooth surface loss may require the use of removable prostheses. This can be the most appropriate type of treatment when either the teeth are very severely worn or the patient wishes a simpler and more economical approach than a fixed reconstruction.

Adult↗
PubMed1999

Adhesive techniques.

This paper describes the use of adhesive techniques to restore teeth previously affected by tooth surface loss so avoiding the need to remove sound tooth tissue.

Dental Cements↗
PubMed1999

Tooth wear in the child and the youth.

Tooth surface loss is an increasing problem in younger individuals. Preventive strategies are essential while adhesive dentistry should be used whenever possible if restoration is necessary.

Adolescent↗
PubMed1996

The national diet and nutrition survey of 1.5 to 4.5 year old children: summary of the findings of the dental survey.

A dental health survey was included as part of a large scale study of nutrition in preschool children. The survey was carried out in 1992/93 and was published in spring 1995. Information on dental health status and on dietary intake was gathered from a total of 1658 children from 100 geographical sectors in the United Kingdom. This article summarises the main findings and highlights some of the most important findings regarding dental health and its relationship to dietary factors. Seventeen per cent of children had some caries experience and in 83% of cases this was untreated. Dental decay was most strongly related to social background. The factors most strongly related to caries prevalence were: receipt of income benefits, in the 1.5-2.5-year-old children; the educational status of the mother in the 2.5-3.5-year-old children and social class of the head of household in the 3.5-4.5-year-old children. Consumption of sugary drinks at bedtime, children being left to brush their teeth themselves, household expenditure on confectionery and geographical region were also strongly associated with caries prevalence.

Beverages↗