| 1. |
- Bergenholtz, Gunnar, 1939, et al.
(författare)
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Treatment of pulps in teeth affected by deep caries - A systematic review of the literature.
- 2013
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Ingår i: Singapore dental journal. - : World Scientific Pub Co Pte Lt. - 0377-5291. ; 34:1, s. 1-12
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: This systematic review assesses the effect of methods commonly used to manage the pulp in cases of deep caries lesions, and the extent the pulp chamber remains uninfected and does not cause pulpal or periapical inflammatory lesions and associated tooth-ache over time.STUDY DESIGN: An electronic literature search included the databases PubMed, EMBASE, The Cochrane Central Register of Controlled Trials and Cochrane Reviews from January 1950 to March 2013. In addition, hand searches were carried out. Two reviewers independently evaluated abstracts and full-text articles. An article was read in full if at least one of the two reviewers considered the abstract potentially relevant. Altogether, 161 articles were read in full text. Of these, 24 studies fulfilled established inclusion criteria. Based on studies of at least moderate quality, the quality of evidence of each procedure was rated in four levels according to GRADE.RESULTS: No study reached the high quality level. Twelve were of moderate quality. The overall evidence was insufficient to assess which of indirect pulp capping, stepwise excavation, direct excavation and pulp capping/partial pulpotomy, pulpotomy or pulpectomy is the most effective treatment approach for teeth with deep caries.CONCLUSIONS: Because of the lack of good studies it is not possible to determine whether an injured pulp by deep caries can be maintained or whether it should be removed and replaced with a root canal filling. Both randomized studies and prospective observational studies are needed to investigate whether a pulp exposed to deep caries is best treated by measures intended to preserve it or by pulpectomy and root filling.
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| 2. |
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| 3. |
- Dawson, Victoria, et al.
(författare)
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Survival of Root-filled Teeth in Relation to Restoration and Tooth-group
- 2016
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Objectives: To compare the survival of teeth root-filled in Sweden in 2009 in relation to type of restoration and tooth-group.Methods: The database at the Swedish Social Insurance Agency containing information on treatments was used to identify all teeth in Sweden that were root-filled during 2009, by searching for the treatment codes corresponding to root-filling. The completed root-fillings could be linked to a specific tooth in a specific individual. Teeth registered as restored with a direct or indirect restoration within 6 months after completion of the root-filling were tagged and tracked until December 31st 2014. During this period, the treatment codes for extraction were registered for the identified root-filled teeth in order to construct Kaplan-Meier tooth survival analyses.Results: 248,299 teeth were registered as root-filled in Sweden in the year 2009. Of these 142,264 (57.3%) were restored with a direct restoration and 64,092 (25.8%) with an indirect restoration. Survival analysis disclosed that 5-6 years after root canal treatment 93.1% of the teeth with an indirect restoration had survived and 89.6% of the teeth with a direct restoration had survived. In the total material, irrespectively to any coronal restoration, premolars and upper anterior teeth had the highest survival (93.0% respectively 91.4%) and molars the lowest survival (87.6%). The same pattern was observed in sub-group analysis in the group of root-filled teeth with direct restorations. In the group with root-filled teeth with indirect restorations another pattern was observed; upper anterior teeth (92.6%) had a relatively lower survival, equivalent to those of molar teeth (92.6%).Conclusions: 5-6 year survival of root-filled teeth in Sweden were higher in the group with indirect restorations compared to the group with direct restoration. Root-filled upper incisors had an overall high survival, though for root-filled upper anterior teeth with indirect restorations the survival was relatively low.
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| 4. |
- Einarson, Daniel, et al.
(författare)
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A Machine Learning Approach to Simulation of Mallard Movements
- 2024
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Ingår i: Applied Sciences (Switzerland). - : MDPI Multidisciplinary Digital Publishing Institute. - 2076-3417. ; 14:3
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Tidskriftsartikel (refereegranskat)abstract
- Machine learning (ML) is increasingly used in diverse fields, including animal behavior research. However, its application to ambiguous data requires careful consideration to avoid uncritical interpretations. This paper extends prior research on ringed mallards where sensors revealed their movements in southern Sweden, particularly in areas with small lakes. The primary focus is to distinguish the movement patterns of wild and farmed mallards. While well-known statistical methods can capture such differences, ML also provides opportunities to simulate behaviors outside of the core study span. Building on this, this study applies ML techniques to simulate these movements, using the previously collected data. It is crucial to note that unrefined application of ML can lead to incomplete or misleading outcomes. Challenges in the data include disparities in swimming and flying records, farmed mallards’ biased data due to feeding points, and extended intervals between data points. This research highlights these data challenges, while identifying discernible patterns, as well as proposing approaches to meet such challenges. The key contribution lies in separating incompatible data and, through different ML models, handle these separately to enhance the reliability of the simulation models. This approach ensures a more credible and nuanced understanding of mallard movements, demonstrating the importance of critical analysis in ML applications in wildlife studies.
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| 5. |
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| 6. |
- Ericson, Tove, 1983-, et al.
(författare)
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Zinc-Tin-Oxide Buffer Layer and Low Temperature Post Annealing Resulting in a 9.0% Efficient Cd-Free Cu2ZnSnS4 Solar Cell
- 2017
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Ingår i: Solar RRL. - : Wiley. - 2367-198X. ; 1:5
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Tidskriftsartikel (refereegranskat)abstract
- Zn1−xSnxOy (ZTO) has yielded promising results as a buffer material for the full sulfur Cu2ZnSnS4 (CZTS), with efficiencies continuously surpassing its CdS-references. ZTO can be deposited by atomic layer deposition (ALD), enabling tuning of the conduction band position through the choice of metal ratio or deposition temperature. Thus, an optimization of the conduction band alignment between ZTO and CZTS can be achieved. The ZTO bandgap is generally larger than that of CdS and can therefore yield higher currents due to reduced losses in the short wavelength region. Another advantage is the possibility to omit the toxic Cd. In this study, the ALD process temperature was varied from 105 to 165 °C. Current-blocked devices were obtained at 105 °C, while the highest open-circuit voltage and device efficiency was achieved for 145 °C. The highest fill factor was seen at 165 °C. The best efficiency reached in this study was 9.0%, which, to our knowledge, is the highest efficiency reported for Cd-free full-sulfur CZTS. We also show that the effect of heat needs to be taken into account. The results indicate that part of the device improvement comes from heating the absorber, but that the benefit of using a ZTO-buffer is clear.
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| 7. |
- Fransson, Helena, et al.
(författare)
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Demographics of Individuals Extracting Root-filled Teeth in Sweden
- 2016
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Objectives: To study some demographic variables of individuals registered receiving a root canal filling in a tooth that during the subsequent 5 to 6 years was registered as being extracted in comparison of individuals retaining the equivalent root-filled tooth during the same period.Methods: Data from the Swedish Social Insurance Agency were analyzed regarding all teeth that were reported root-filled in Sweden during 2009. The upper first molars were chosen to be a model for the comparisons. A control group was constructed by randomly selecting individuals with upper first molars not extracted. Demographical data on the individuals were received from Statistics Sweden and the groups were studied in regard to gender, age, ethnicity, mean income, educational level and civil status.Results: During 2009 a total of 36,139 upper first molars was registered as being root-filled and during the subsequent 5 to 6 years 4,362 (12.9%) of these teeth were registered as being extracted. The studied demographic variables were almost equal between the individuals who had their root-filled teeth extracted and the individuals in the control group who retained their root-filled teeth. The individuals extracting was in average older (52.7 years) than those retaining (51.1 years). A larger percentage of women (51.8) than men (48.2) was found in the group whose teeth were extracted.Conclusions: Demographic variables differed somewhat in regard to gender and age in individuals extracting root-filled upper first molars compared to individuals retaining their teeth. In regard to ethnicity, mean income, educational level and civil status only minor differences were detected.
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| 8. |
- Fransson, Helena, et al.
(författare)
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EndoReCo banar väg för ökad kunskap och akademisk meritering
- 2022
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Ingår i: Tandläkartidningen. - : Sveriges tandläkarförbund. - 0039-6982. ; 114:12, s. 46-52
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Tidskriftsartikel (refereegranskat)abstract
- För att minska kunskapsluckorna inom odontologin krävs samarbete mellan lärosätena. Det ger även möjlighet till akademisk meritering, vilket är angeläget då antalet seniora forskare med behörighet för forskningshandledning i Sverige är färre än någonsin. EndoReCo (Endodontic Research Collaboration) är ett skandinaviskt forskningsnätverk i endodonti som kan ta del av just dessa fördelar.
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| 9. |
- Fransson, Helena, et al.
(författare)
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Factors Associated with Extractions Following Root-filling in Swedish Adults
- 2019
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Objectives: Root-fillings are essentially performed to preserve natural teeth. However over time some root-filled teeth will be extracted. The aim of this study was to identify factors associated with extractions within a period of 5 years after completion of a root-filling in the adult Swedish population. Methods: In this registry study, the cohort consisted of all root-fillings reported to the tax-funded Swedish Social Insurance Agency (SSIA) during 2009. Tooth type, any registration of subsequent coronal restorations within 6 months and type of caregiver were recorded. Demographic data (gender, disposable income, age, educational level, civil status and country of birth) were received from Statistics Sweden or the SSIA. Statistical analyses included chi-square test, t-test and logistic regression analysis. P<0.05 was considered statistically significant. Results: The total number of individuals registered with at least one root-filling was 216,764. Not all had a registration of a tooth number or had no registrations at Statistics Sweden (n=824) and were excluded from the analyses. After 5 years, 9.4% of the teeth had been registered as extracted. Preliminary data showed risk factors associated with higher odds for extractions to be molar teeth, teeth with no registration of any permanent coronal restoration within 6 months following the registration of the root-filling, root-fillings performed in the private sector, women, older age-group and widow(er)s or divorcees. Conclusions: Several individual and tooth specific factors were associated with extraction following root-filling in the Swedish adult population. The direct reasons for the extractions remain to be studied further.
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| 10. |
- Fransson, Helena, et al.
(författare)
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Survival of Root-filled Teeth in the Swedish Adult Population
- 2016
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Ingår i: Journal of Endodontics. - : Elsevier BV. - 0099-2399 .- 1878-3554. ; 42:2, s. 216-220
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Tidskriftsartikel (refereegranskat)abstract
- © 2016 American Association of Endodontists. Introduction The aim was to assess survival in the Swedish population of teeth treated by nonsurgical root canal treatment during 2009. Methods Data from the Swedish Social Insurance Agency were analyzed by Kaplan-Meier analysis to assess cumulative tooth survival during a period of 5-6 years of all teeth that were root-filled during 2009. Results In 2009, 248,299 teeth were reported as root-filled. The average age of the patients at the time of the root filling was 55 years (range, 20-102 years). The teeth most frequently root-filled were the maxillary and mandibular first molars. During the 5- to 6-year period 25,228 of the root-filled teeth (10.2%) were reported to have been extracted; thus 223,071 teeth (89.8%) survived. Tooth survival was highest in the youngest age group (93.2%). The highest survival (93.0%) was for the mandibular premolars, and the lowest (87.5%) was for the mandibular molars. Teeth restored with indirect restorations within 6 months of the root filling had higher survival rates (93.1%) than those restored with a direct filling (89.6%). Conclusions In the adult population of Sweden, teeth that are root-filled by general practitioners under the tax-funded Swedish Social Insurance Agency have a 5- to 6-year survival rate of approximately 90%.
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