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- Benteke, M, et al.
(författare)
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Population- vs. risk-based applications of fissure sealants in first permanent molars: a 13-year follow-up.
- 2006
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Ingår i: Oral health & preventive dentistry. ; 4:151-156
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: To evaluate and compare the long-term outcome of a population-based and a risk-based strategy of applying fissure sealants in newly erupted first permanent molars. DESIGN AND SETTING: Retrospective cohort study in primary dental care. MATERIALS AND METHODS: Four hundred and ninety-six subjects from two cohorts were included. In group P (n = 236), routine applications of fissure sealants were conducted while sealants were placed on the basis of subjective criteria in Group R (n = 260). Data of applications, maintenance, decay, restorations, extractions, and cumulative time of applications from six to 19 years were extracted from the dental records and bite-wing radiographs by two of the authors simultaneously. The main outcome measures were the total caries prevalence at the age of 19 years as well as the fate of each sealed and non-sealed occlusal surface. RESULTS: In group P, 87.7% of all first permanent molars were sealed compared with 20.2% in group R. There was no statistically significant difference concerningthe total DFT at 19 years of age between the groups (mean 3.5 +/- 3.8 vs. 3.7 +/- 3.4). Considering the occlusal surfaces of the first permanent molars only, a statistically significant treatment effect was demonstrated in group P with an odds ratio of 4.6 (95% CI: 3.0 - 6.7; p < 0.05). The absolute risk reduction was 36.3% and the number needed to treat was 2.8. In Group R, no statistically significant treatment effect was disclosed (OR = 1.3; 95% CI: 0.9 - 1.7; risk reduction 5.5%). CONCLUSION: This 13-year follow-up showed that population-based applications of fissure sealants in first permanent molars shortly after eruption showed a statistically significant treatment effect on the occlusal surfaces at the age of 19 years, which was in contrast to findings from a cohort in which sealants were applied on the basis of an individual risk-based strategy. There were, however, no significant differences concerning the total caries experience between the two cohorts
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| 2. |
- Andersson, A, et al.
(författare)
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White spot lesion regression with the CPP-ACP system assessed by a laser fluorescence device (DIAGNOdent).
- 2006
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Ingår i: Oral Health Prev Dent.
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: To investigate and compare the effects of a dental cream containing complexes of casein phosphoprotein-amorphous calcium phosphate (CPP-ACP) and fluoride mouth rinses on the regression of white spot lesions (WSL). Material and methods: The study group consisted of 26 healthy adolescents (mean age 14.6 yr) exhibiting 60 teeth with 152 visible WSL sites on incisors and canines immediately after debonding of fixed orthodontic appliances. After bracket removal, professional tooth cleaning and drying, a visual scoring (0-4) and laser fluorescence (LF) readings were carried out. The patients were randomly assigned to two different treatment protocols with the aim to remineralize the lesions: A) daily topical applications of a dental cream containing CPP-ACP (Topacal) for 3 months followed by a 3-month period of daily tooth brushing with fluoridated toothpaste, or B) daily 0.05% sodium fluoride rinses combined with fluoridated toothpaste for 6 months. The registrations were repeated after 1, 3, 6 and 12 months and follow-up data were compared with baseline with aid of chi-square and paired t-tests. Results: A significant improvement of the clinical WSL-scores was found over time in both groups but there was a statistically significant difference (p<0.01) concerning the number of sites that totally disappeared after 12 months in favor for the CPP-ACP regime, 63% vs. 25% respectively. The clinical registrations were mirrored by a statistically significant decrease (p<0.05) in the LF readings at the 6- and 12-month follow-ups compared to baseline. No significant differences were displayed between the groups. Conclusion: Clinical scoring and LF assessment suggested that both regimens could promote regression of WSL after debonding of fixed orthodontic appliances. The visual evaluation suggested an aesthetically more favourable outcome of the amorphous calcium phosphate treatments.
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| 3. |
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| 4. |
- Seifert, Werner, et al.
(författare)
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Growth of one-dimensional nanostructures in MOVPE
- 2004
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Ingår i: Journal of Crystal Growth. - : Elsevier BV. - 0022-0248. ; 272:1-4, s. 211-220
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Tidskriftsartikel (refereegranskat)abstract
- The use of metal organic vapor-phase epitaxy (MOVPE) for growth of one-dimensional nanostructures in the material systems GaAs, GaP, InAs and InP is investigated. Some kinetic effects are discussed, especially the general finding that in MOVPE thinner whiskers grow faster than thicker whiskers. Effects of growth temperature on growth rate and shape of the whiskers, the effects of different growth directions on the perfection of the materials and the possibilities to grow heterostructures in axial and lateral directions are reported. Ways to overcome the randomness in whisker growth by controlled seeding of the Au particles and by using lithography for site control are demonstrated.
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