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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
261

The use of the intelligent powered toothbrush in health technology

Flyborg, Johan January 2022 (has links)
BackgroundApplied health technology is a research field that ties together several disciplines to improve and preserve the health and quality of life of individuals and society. Helping especially elderly to meet the above goals is an important and necessary task and assistive technology and collection of health data are part of this work. AimsPaper I aims to investigate whether the use of a powered toothbrush could maintain oral health in a group of individuals with MCI and if changes in oral health affect various aspects of quality of life. Paper II and III aims to examine the capacity of a powered toothbrush as a carrier and mediator of health-related data. MethodsFor papers I and II, the participants were recruited from the Swedish site of the multicenter project Support Monitoring And Reminder Technology for Mild Dementia and for paper III from the Department of Health at Blekinge Institute of Technology. In all three papers, a powered toothbrush has been used as a tool, sensor carrier and transmitter of data. For Quality-of-life assessment two instruments are used, The QoL-AD and OHIP 14. ResultsBy introducing an intelligent powered toothbrush in the group of older individuals with mild cognitive impairment we have showed that they, regardless of cognitive level,improved their scores for plaque index, bleeding index and deepened periodontal pockets ≥ 4mm, over 12 months. The quality-of-life instrument related to oral health improved in parallel with the improvement in oral health. Furthermore, it is possible to use the intelligent powered toothbrush both as a carrier for healt related sensors and to transfer user data via Bluetooth technology to a single-core processor that stores or forwards the data via Wifi to an external computer for processing, analysis and storage. A fesibility study regarding temperature sensor for measuring body temperature during toothbrushing have been evaluated and found to be comparable to traditional oral temperature measurement.   ConclusionsAn intelligent powered toothbrush is a well-functioning tool for maintaining oral health in older people with mild cognitive impairment as well as for collecting and transferring brush and health data to external units for storage and analysis.
262

Orosanmälningar inom tandvården vid misstanke om att barn far illa / Reports of concern in dental healthcare services on suspicion of child maltreatment

Johansson, Emma, Hagberg, Ellen January 2023 (has links)
Syfte: Syftet var att undersöka tandvårdspersonals erfarenhet, agerande och faktorer vid misstanke om att barn far illa samt vilka hinder som påverkar beslutet att göra en orosanmälan. Metod: En allmän litteraturstudie baserad på 20 vetenskapliga artiklar av kvantitativ ansats. Datainsamlingen utfördes i databaserna DOSS, CINAHL, MEDLINE, PubMed och Google Scholar. Urvalet begränsades med inklusions- och exklusionskriterier. Valda artiklar besvarade litteraturstudiens syfte, var publicerade mellan år 2017-2022 och kvalitetsgranskades för att säkerställa hög kvalitet. Resultat: Majoriteten av tandvårdspersonalen hade erfarenheter av att möta barn som misstänks fara illa. Vanliga ageranden vid misstanke var att dokumentera skador, rapportera till polis eller klinikchef, fråga barnet och föräldrarna samt följa upp observationerna. Anmälningsfrekvensen till barnskyddsmyndigheter var genomgående låg. Hinder för orosanmälan var oro för negativa konsekvenser, osäkerhet om misstankens tillförlitlighet, bristande kunskap samt att riktlinjer och rutiner saknades. Slutsatser: Tandvårdspersonals erfarenheter av att möta barn som misstänks fara illa, tydliga riktlinjer och rutiner, kunskap i ämnesområdet och den subjektiva uppfattningen är faktorer som påverkar anmälningsbenägenheten. Vidare forskning behövs för att undersöka vilka åtgärder som kan leda till en ökad anmälningsbenägenhet hos tandvårdspersonal och på så vis möjliggöra att fler barn kan få leva ett liv fritt från våld. / Aim: The aim was to examine dental healthcare professionals experience, actions and factors when suspecting child maltreatment and to determine barriers that affect the decision to report a concern. Method: A literature study based on 20 scientific articles of a quantitative approach. Data collection was performed using the databases DOSS, CINAHL, MEDLINE, PubMed, and Google Scholar. Inclusion and exclusion criteria were used to limit the sample. The selected articles that answered the purpose of the literature study were published between 2017-2022 and were quality-reviewed to ensure high quality. Results: The majority of dental professionals had experienced suspected cases of child maltreatment. Common actions in case of suspicion were to document injuries, report to the police or clinic manager, question the child and the parents and follow up the observations. The frequency of reports to the child protection authorities was consistently low. Barriers to reporting were concern about negative consequences, uncertainty about the reliability of the suspicion, lack of knowledge, guidelines, and routines. Conclusions: Dental professionals experiences of meeting children who are suspected of being maltreated, clear guidelines and routines, knowledge in the subject area and the subjective perception are factors that influence the tendency to report. Further research is needed to investigate which measures can lead to an increased propensity to report among dental professionals and in such a way enable more children to live a life free of violence.
263

Oral hälsa hos vuxna individer med depression : En allmän litteraturstudie / Oral health in adult individuals with depression : - General literature study

Mohamad, Aieatt, Salib, Irin January 2023 (has links)
Syfte: Syftet var att studera hur depression påverkar vuxna individers orala hälsa. Material och metod: Studien är en allmän litteraturstudie som grundar sig i kvantitativa och kvalitativa artiklar. Databaserna som användes var “Dentistry and Oral Sciences Source” och “Medline”. Resultat: Totalt analyserades 15 vetenskapliga artiklar som sammanställdes och delades in under två rubriker. Rubrikerna består av inre och yttre faktorer som påverkar och begränsar den orala hälsan. Faktorerna som beskrivs är oralhygien, orala sjukdomar och nedsatt tuggförmåga kopplat till depression samt låg socioekonomi och tandvårdspersonalens roll kopplat till depression. Slutsats: Depression påverkar den orala hälsan på ett negativt sätt. Påverkan beror på olika faktorer såsom låg socioekonomisk status, besvär med olika mun funktioner och orala sjukdomstillstånd som begränsar deprimerade patienters förmåga att upprätthålla en god oral hälsa samt försämrar livskvaliteten. Ytterligare forskning kring ämnet behöver tillämpas för bredare kunskap inom området. / Aim: The aim was to study how depression affects the oral health of adults. Material and method: The study is a general literature study based on quantitative and qualitative articles. The used databases were "Dentistry and Oral Sciences Source" and "Medline". Results: A total of 15 scientific articles were analyzed, compiled and divided under two headings. The headings consist of internal and external factors that affect and limit oral health. The factors described are oral hygiene, oral diseases and impaired chewing ability linked to depression, as well as low socioeconomic status and the role of the dental care staff linked to depression. Conclusion: Depression affects oral health in a negative way. The impact depends on various factors such as low socio-economic status, problems with various mouth functions and oral diseases that limit depressed patients' ability to maintain good oral health and impair the quality of life. Further research on the subject needs to be applied for broader knowledge in the area.
264

Biaxial böjhållfasthet på högtranslucent zirkonia efter värme-, ytbehandling, recementering och långtidsförvaring / Biaxial flexural strength on high translucent zirconia after heat-, surface treatment, re-cementation and longterm storage

Cristurean, Anamaria Lucretia, Kirakosian, Alin January 2022 (has links)
Syfte  Syftet med föreliggande studie var att undersöka hur böjhållfastheten på zirkonia påverkas av värmebehandling, ytbehandlingar vid re-cementering och långtidsförvaring i cirka två år. Material och metod I en tidigare studie av A.Cervenka och H. Ekdahl (7) designades 30 stycken zirkoniahättor, med måtten 6 mm i tjocklek och 14 mm i ⌀(Z-CAD, HTL, Metoxit), i ett CAD-program (3shape) och frästes (DATORN 5).  Zirkoniahättorna delades in i tre grupper med tio provkroppar i varje grupp, beroende på ytbehandling: kontrollgrupp (C), sandblästring med aluminiumoxid (A) och skrapning (S). Zirkoniahättorna cementerades på titandistanser. Grupp S och grupp A utsattes för värmebehandling, för att kunna lossa hättorna från titandistanserna. Överskottet av cement avlägsnades genom två olika ytbehandlingar innan recementering (A respektive S). Samtliga grupper termocyklades i 5000 cykler (5° till 55°) innan de utsattes för ett draghållfasthetstest. När föreliggande studie genomfördes hade zirkoniahättorna förvarats torrt i rumstemperatur i cirka två år. Zirkoniahättornas underdel slipades ner till 2,9 mm i tjocklek i en slipmaskin (Phoneix 4000) för att tillverka provkroppar lämpade för utförande av ett biaxialt böjhållfasthetstest. Resultaten analyserades med One-way ANOVA, Tukey’s test med en signifikansnivå på α =0,05.   Resultat Det biaxiala böjhållfasthetstestet påvisade att grupp C hade högst medelvärde och S hade lägst medelvärde. Det fanns inte någon signifikant skillnad mellan grupperna, p>0,05.  Slutsats Inom ramen för föreliggande studie kan följande slutsats dras:  Böjhållfastheten på zirkoniahättor som har långtidsförvarats i cirka två år påverkas inte av tidigare genomförd värmebehandling och olika ytbehandlingar vid recementering / Purpose The purpose of the present study was to investigate how the flexural strength of zirconia is affected by heat treatment, various surface treatments during re-cementation, and long term storage for about two years. Material and method In a previous study by A.Cervenka and H. Ekdahl (7), 30 zirconia copings, measuring 6 mm in thickness and 14 mm in ⌀ (Z-CAD, HTL, Metoxit), were designed in a CAD-program (3shape) and milled (DATORN 5). Zirconia copings were divided into three groups with ten specimens in each group, depending on different surface treatment: control group (C), aluminum oxide abrasion group (A) and scraping (S). Zirconia copings were cemented on titanium abutments. Group S and group A were subjected to heat treatment in order to be able to detach the zirconia copings from titanium abutments. The excess cement was removed by two various surface treatments before the recementation (A respective S). All groups were thermocycled for 5000 cycles (5 ° to 55 °) before being subjected to a tensile strength test. At the time of the present study zirconia copings had been stored dry at room temperature for about two years. The lower part of the zirconia copings was reduced to 2.9 mm in thickness using a grinding machine (Phoneix 4000)in order to produce specimens suitable to performe a biaxial flexural strength test. The results were analyzed with One-way ANOVA, Tukey's test with a significance level of α = 0.05.. Results The biaxial flexural strength test showed that group C had the highest mean and S had the lowest mean. There was no significant difference between the groups, p> 0.05.  Conclusion Within the limitations of this study, the following conclusion can be drawn: The flexural strength of zirconia copings that have been stored for about two years is not affected by previously heat treatment performed during recementation and various surface treatments during recementation.
265

Utmattning av implantat-förankrade bro-konstruktionermed ett frihängande led och två olika fixturdiametrar. En pilotstudie / Fatigue of implant-supported fixed dental prosthesis restorations with a cantilever and two different fixture diameters. A pilot study

Yassin, Ahmed, Al-Haideri, Mohammed January 2023 (has links)
Purpose: The purpose of this study is to evaluate how implant-supported fixed dental prosthesis (FDP) restorations with a cantilever at abutment level resist fatigue by dynamic loading and thermocycling depending on the fixture diameters.   Material and method: The study involved two groups with three specimens in each group, based on the diameter of the fixture, 3.5 or 5.0 mm (D3.5 and D5.0). The specimens consisted of two ASTRA TECH platforms, either 3.5 mm or 5.0 mm, 20°Uni Abutments, and a standardized milled CoCr FDP at abutment level with a cantilever. A mounting jig was designed and 3D printed. The specimens underwent a dynamic fatigue test with thermocycling, 5°C and 55°C, and a 250 N load at a frequency of 1.5 Hz for maximum 6×10⁵ cycles, until the specimen either fractured or displayed visible deformation. Fractured specimens were examined under microscope.    Results: In group D3.5, one specimen survived 600,000 cycles without loosening or fracturing, one displayed screw loosening, and one screw fracturing. In group D5,0, two specimens displayed screw fracturing and one screw/abutment loosening.   Conclusions:  · Implant-supported FDP restorations with a cantilever at abutment level tend to resist fatigue better with a larger fixture diameter than with a smaller fixture diameter. · Fixtures with a diameter of 5.0 mm show higher tendency for screw fracturing and loosening compared to fixtures with 3.5 mm.  · More extensive studies regarding implant-supported FDP restorations with cantilever at abutment level and different fixture diameters are required to confirm the results. / Syfte: Syftet med studien är att utvärdera hur implantat-förankrade bro-konstruktioner på distansnivå med frihängande led motstår utmattning genom dynamisk belastning och termocykling beroende på fixturens diameter.   Material och metod: Totalt framställdes två grupper beroende på fixturens diameter, 3,5 eller 5,0 mm, med tre provkroppar per grupp (D3,5 och D5,0). Provkropparna bestod av två fixturer motsvarande position 34 och 35 och ett frihängande led på 36 med plattformarna ASTRA TECH 3,5×9,0 mm eller 5,0×9,0 mm inkluderat distanser 20° Uni Abutment och standardiserade frästa broar i CoCr på distansnivå. Ett dynamiskt utmattningstest genomfördes med hjälp av tuggsimulator med samtidig termocykling 5°C och 55°C. Belastningen på 250 N applicerades på det frihängande ledet under maximalt 6×105 cykler med 1,5 Hz. Provkropparna kontrollerades visuellt och taktilt var 50 000:e cykel för att undersöka om fraktur, deformation eller påverkan på skruvförband uppstått. De frakturerade provkropparna undersöktes i ljusmikroskop för att analysera frakturytor och eventuella deformationer.   Resultat: I grupp D3,5 klarade en provkropp 600 000 cykler utan att lossna eller frakturera, en fick skruvlossning och en fick skruvfraktur. I grupp D5,0 fick två provkroppar skruvfraktur och en fick skruv-/distanslossning.  Slutsats:  · Implantat-förankrade bro-konstruktioner på distansnivå med frihängande led tenderar att motstå utmattning bättre med mindre fixturdiameter än med större fixturdiameter. · Fixturer med diameter 5,0 mm visar större tendens för skruvfrakturer och skruvlossning jämfört med fixturer med 3,5 mm. · Mer omfattande studier beträffande implantat-förankrade bro-konstruktioner på distansnivå med frihängande led och olika fixturdiametrar krävs för att säkerställa resultaten.
266

Mekaniska och kemiska egenskaper hos PEEK och PEKK inom tandvården : En systematisk översikt / Mechanical and chemical properties of PEEK and PEKK in dentistry : A systematic review

Öjvindsson Hörgård, Cecilia, Aso, Vanja January 2023 (has links)
Syfte Syftet med föreliggande studie är att genom en systematisk översikt identifiera skillnaderna i de kemiska och mekaniska egenskaperna hos materialen PEEK och PEKK och till vilka dentala applikationer materialen kan användas.  Material och metod Materialens kemiska och mekaniska egenskaper identifierades genom litteratursökning med PRISMA och PICO-systemet. Databaserna som användes var PubMed, Scopus samt Web of Science. Granskning gjordes på titel-, abstrakt- och fulltextnivå, baserat på inklusions- och exklusionskriterier. Resultat Sökningen resulterade i totalt 226 artiklar varav 210 artiklar i PubMed, nio artiklar i Scopus och sju artiklar i Web of Science. Efter kontroll av dubbletter och bedömning utifrån inklusions- och exklusionskriterier var det totalt sju artiklar som analyserades på fulltextnivå. Av dessa sju artiklarna utvärderades olika materialegenskaper där de använda materialtesterna skiljde sig åt. I fem artiklar utvärderades bindningsstyrkan mellan fasadmaterial och PEEK och/eller PEKK. En artikel undersökte ytan hos materialen beroende på ytbehandling och en artikel testade tryckhållfasthet på tre-ledsbroar av PEEK och PEKK. Båda materialen uppvisade liknande mekaniska och kemiska egenskaper vid jämförelse mot varandra.  Slutsats PEEK och PEKKs mekaniska och kemiska egenskaper skiljer sig inte åt. Mer forskning och kliniska data behövs om materialens dentala applikationer. Nyckelord: Avtagbar protetik, fast protetik, högpresterande polymer, PAEK, tandvård / Purpose The purpose of the present study is to carry out a systematic review to identify the differences in mechanical and chemical properties of the materials PEEK and PEKK, as well as which  dental applications the materials can be used for.  Material and method The materials’ mechanical and chemical properties were identified using PRISMA and PICO system through a literature search. The databases used were PubMed, Scopus and Web of Science. Screening and assessing were done at title, abstract and full text level, based on the inclusion and exclusion criteria. Results The search resulted in a total of 226 articles, whereon 210 articles in PubMed, nine articles in Scopus and seven articles in Web of Science. After removal of duplicates and assessment of the studies according to the inclusion and exclusion criteria, the total amount of studies reviewed was seven. In these seven articles, different properties were evaluated, and the tests used differed. In five articles, the shear bond strength between veneering materials and PEEK and/or PEKK was tested. In one article the surface roughness depending on surface treatment was tested and in another, the strength of three-unit fixed dental prostheses made of PEEK and PEKK was tested. PEEK and PEKK showed similar mechanical and chemical properties in comparison to each other.  Conclusion The mechanical and chemical properties of PEEK and PEKK do not differ. More research and clinical data are needed on the dental applications of the materials.Keywords: Dentistry, fixed dental prosthesis, high-performance polymer, removable dental prothesis, PAEK.
267

Influence of Escherichia coli feedstock properties on the performance of primary protein purification

Råvik, Mattias January 2006 (has links)
Abstract The aim of the present study was to increase the understanding of how the cell surface properties affect the performance of unit operations used in primary protein purification. In particular, the purpose was to develop, set up and apply methods for studies of cell surface properties and cell interactions. A method for microbial cell surface fingerprinting using surface plasmon resonance (SPR) is suggested. Four different Escherichia coli strains were used as model cells. Cell surface fingerprints were generated by registration of the interaction between the cells and four different surfaces, with different physical and chemical properties, when a cell suspension was flown over the surface. Significant differences in fingerprint pattern between some of the strains were observed. The physical properties of the cell surfaces were determined using microelectrophoresis, contact angle measurements and aqueous two-phase partitioning and were compared with the SPR fingerprints. The generated cell surface fingerprints and the physical property data were evaluated with multivariate data analysis that showed that the cells were separated into individual groups in a similar way using principal component analysis plots (PCA). Studies of the behaviour of the model cells on stirred cell filtration and in an interaction test with different expanded bed adsorption (EBA) adsorbents were performed. It could be concluded that especially one of the strains behaved differently. Differences in the properties of the model cells were indicated by microelectrophoresis and aqueous two-phase partitioning which to some extent correlated with observed differences in behaviour during filtration and in an interaction test with EBA adsorbents. The impact of high-pressure homogenisation of E. coli cell extract was examined, with a lab scale and a pilot scale technique. The DNA-fragmentation, visualised with agarose gel electrophoresis, and the resulting change in viscosity was analysed. A short homogenisation time resulted in increased viscosity of the process solution that correlated with increased concentration of released non-fragmented DNA. With longer homogenisation time the viscosity decreased with increasing degree of DNA-fragmentation. The results show that strain dependant cell surface properties of E. coli may have an impact on several primary steps in downstream processing. / QC 20101129
268

Anterior single crown treatments made by dental students and teachers at Malmö University, Sweden; a 5-year retrospective follow-up

Zabel, Melanie, Vasiljević, Nataša January 2021 (has links)
Aim: To investigate the clinical survival and success, including both function and aesthetics, of tooth supported crowns in the anterior region after a minimum of 5 years after installation in the student as well as teacher clinic of the Faculty of Odontology, Malm. University, Sweden. Materials & method: Eligible patients were identified through screening of dental technician invoices stretching back to 2012. 78 patients were invited to participate in the study and 39 patients were examined, 28 and 11 from student and teacher clinics respectively. A modified examination protocol based on the CDA protocol was used by two examiners to score the crowns. Moreover, patients’ own views on aesthetics and function of their crowns were collected through a questionnaire. Results: Patient satisfaction with function and aesthetics was equally high in teacher and student clinic as well as for the different crown materials. Examiner ratings found overall successful results across the investigated categories “surface and colour”, “anatomic form” and “margin integrity”. No significant differences were found with regards to the operator or the different materials. The 5-year survival rate among the examined patients was 89% resp. 91% in the student and teacher clinic. Conclusion: Patients at the Faculty of Odontology in Malm. can expect to receive satisfying crown treatments in the anterior region of the mouth regardless of whether the operator is a teacher or a student and regardless of the chosen material. / Syfte: Att undersöka klinisk överlevnad och lyckandefrekvens, med hänsyn till funktion och estetik, av tandstödda kronor i framtandsregionen som installerades för minst 5 år sedan på student och lärarklinik vid Odontologiska fakulteten, Malmö Universitet, Sverige. Material och metod: 78 lämpliga patienter identifierades genom granskning av  tandtekniska fakturor från 2012 och framåt, och bjöds in att delta i studien. 39 patienter undersöktes, 28 respektive 11 från student- och lärarklinik. Två granskare använde ett modifierat granskningsprotokoll baserat på CDA protokollet för att betygsätta kronornas utseende och funktion. Utöver detta användes ett frågeformulär för att få patientens syn på estetik och funktion av kronan. Resultat: Patienternas omdömen av kronans funktion och estetik var lika hög i lärar- och studentkliniken liksom för de olika kronmaterialen. Granskarnas bedömning visade hög lyckandefrekvens för de undersökta kategorierna ”yta och färg”, ”anatomisk form” och ”kantanslutning”. Inga signifikanta skillnader kunde ses med avseende på vem som var operatör eller vilket material som valts. 5-års överlevnaden bland de undersökta patienterna var 89% resp. 91% p. student- och lärarkliniken. Slutsats: Patienter som behandlas vid Odontologiska fakulteten i Malmö kan förvänta sig ett tillfredsställande resultat vid kronterapi i framtandsregionen oavsett om operatören är en lärare eller en student och oavsett vilket material som väljs.
269

ADHESION OF AGGREGATIBACTER ACTINOMYCETEMCOMITANS AND STREPTOCOCCUS MUTANS ANALYZED WITH DNA-BASED METHODS

Tirawiyeh, Jud, Ali, Fartun January 2023 (has links)
Oral health is a part of general health and the two are connected in many ways as well as impact each other. Oral diseases are some of the most common chronic diseases of mankind. Diseases such as caries and periodontitis are two of the most common ones affecting the oral cavity. Bacteria associated with these two diseases are Streptococcus mutans and Aggregatibacter actinomycetemcomitans respectively. Our hypothesis is that extracts from guava leaf or matcha tea affect adhesion of A. actinomycetecomitans or S. mutans to human epithelium. The aim of this study is to investigate a DNA-based method for studying attachment of bacteria to epithelial cells. Two different concentrations of the two bacterial species, high and low, were treated with matcha or guava leaf extract and adhesion on the human epithelial cell cultures was analyzed. The results were then analyzed using qPCR-based methods to test the amount of bacterial adhesion to the epithelial cells. Furthermore, the results showed that matcha was more effective for inhibition of bacterial adhesion than guava leaf.In conclusion, our results show that bacterial adhesion of A. actinomycetecomitans and S. mutans to human epithelial cells can be quantified by DNA-based methods, and the adhesion altered by plant extracts.
270

Hur påverkas det orala ekosystemet av minskad näringstillgång? / How is the oral ecosystem affected by reduced nutrient availability?

Alkademi, Zahraa, Alomari, Mayan January 2022 (has links)
Syfte: Att studera den tillgängliga litteraturen om hur minskad näringstillförsel i form av fasta, Anorexia nervosa (AN), protein-energiundernäring (PEU) och sondmatning påverkar det orala ekosystemet. Material och metod: Det utfördes en narrative review på artiklar som identifierats med hjälp av Pubmed databas. Artiklar som handlar om minskad näringstillförsel och dess konsekvenser för den orala miljön har granskats. Resultat: Fasta hade effekt på salivens sammansättning, flödeshastighet och buffringskapacitet. Personer med svält tillståndet Anorexia nervosa (AN) upplevde bland annat förändringar i slemhinnor, saliv pH-värde och salivflödeshastighet. Personer med protein-energiundernäring (PEU) löpte stor risk för flera orala förändringar som medför bland annat högre kariesförekomst och sämre prognos för inflammatoriska lesioner. Flera av bakterierna som dominerade hos personer med sondmatning var patogena bakterier som kan vara hälsoskadliga. Slutsats: Vid fasta uppstår det förändringar i salivflödeshastighet, sammansättning, mängd och buffringskapacitet. AN kan leda till förändringar i saliven. PEU innebär stor risk för flera orala förändringar som medför bland annat högre kariesförekomst och sämre prognos för inflammatoriska lesioner. Tidig PEU har en fortsatt negativ effekt på salivens funktion även i tonårsåldern. Flera av bakterierna som dominerar hos personer med sondmatning är patogenabakterier som kan vara hälsohotande. Flera orala, mikrobiella och biologiska förändringar manifesterar sig i samband med minskad näringstillförsel. Det behövs fler studier för att få en bättre förståelse av dessa förändringars kliniska betydelse. / Aim: To review the available literature on how reduced nutrient supply in the form of fasting, Anorexia nervosa (AN), protein-energy malnutrition (PEU) as well as tube feeding affect the oral ecosystem. Material and method: A narrative review was performed on articles identified using the Pubmed database. Articles about nutritional deficiencies and their consequences on the oral environment have been reviewed. Results: Fasting influenced saliva composition, flow rate and buffering capacity. People with Anorexia nervosa (AN) experienced, among other things, changes inmucous membranes, saliva pH-value and saliva flow rate. It was shown that people with protein-energy malnutrition are at high risk for several oral changesthat lead to a higher incidence of caries and a worse prognosis for inflammatory lesions etc. Several of the bacteria that dominated in people with enteral nutrition were pathogenic bacteria; that can be damaging to health. Conclusions: During fasting, changes in saliva flow rate, composition, amount, and buffering capacity occur. People with AN experience among other things, changes in mucous membranes, pH value and flow rate of saliva. PEU involves a high risk of several oral changes that lead to, among other things, a higher incidence of caries and a worse prognosis for inflammatory lesions. Early PEU has a continued negative effect on saliva function in adolescence. Several of the bacteria that predominate in people with tube feeding are pathogenic bacteria that can be health-threatening. Several oral, microbial, and biological changes manifest themselves in connection with malnutrition. More studies are needed to gain a better understanding of the clinical significance of these changes.

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