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Bakgrund. En gyllene standard för att bestämma noggrannheten för intraorala scannrarexisterar inte. Intraorala scannrars prestanda som ges av olika leverantörer är inte fulltjämförbara. Det finns ett behov att standardisera och ta fram oberoende försöksupplägg för att kunna jämföra intraorala scannrar.Mål. Målet med studien var att beskriva och utvärdera en ny metod för att bestämmanoggrannheten av intraorala scannrar genom ett standardiserat in vitro testförsök och attanvända metoden för att beräkna noggrannheten på en kommersiell intraoral scanner.Material och metod. SP Sveriges tekniska forskningsinstitut definierade dimensionerna avett sfäriskt testobjekt. Sfären besprutades med titanoxid och skannades 12 gånger med enkommersiell intraoral scanner. Scanningarna utvärderades med två metoder. Manuell metod: sfärens diameter uppmättes 12 gånger i ett första mjukvaruprogram för varje scanning genom att justera ett tvärsnittsplan. Automatisk metod: 12 nominella diametrar beräknades från ett andra mjukvaruprogram. Noggrannheten beräknades för varje testmetod och jämfördes.Resultat. Referensmätning: den definierade diameter var 4,9991±0,0001mm. Manuell metod: riktigheten var 25μm och precisionen var 10μm. Medelprecisionen inom scanningar var 4μm. Automatisk metod: Riktigheten var 26μm och precisionen var 11μm. Alla testvärden uppvisade stark statistisk deviation från referensvärdet, men väl inom ett kliniskt acceptabelt intervall.Slutsatser. Inom den här in vitro-studiens begränsningar, kan den beskrivna,standardiserade metoden användas manuellt eller med den automatiska funktionen Fittingsphere för att beräkna noggrannheten för intraorala scannrar. Fler studier på mer komplexa objekt behöver utföras. Dessutom uppvisade den intraorala scannern (TRIOS) hög riktighet och precision, jämförbar eller bättre än traditionella avtrycksmetoder inom tandvården. / AbstractBackground. There is no gold standard for determining the accuracy of intraoral scanners. The performances of intraoral scanners given by different manufacturers are not fully comparable. There is a need for standardized and independent test setups to enable the comparison of intraoral scanners.Objectives. The study’s aims were to describe and evaluate a new method for determining the accuracy of any intraoral scanner by means of a standardized geometrical in vitro test and to use this method for determining the accuracy of a commercial intraoral scanner.Material and methods. The Technical Research Institute of Sweden defined the dimensions of a spherical test object. The sphere was spray-coated with TiO2 and scanned 12 times with a commercial intraoral scanner. The scans where evaluated using two methods. Manual method: The diameter of the sphere was measured 12 times for each scan in a software application by adjusting a cross-sectional plane. Automatic method: 12 nominal diameters were obtained with a software application. The accuracy was calculated for each test method and compared. Results. Reference measurement: The defined diameter was 4.9991±0.0001mm. Manual method: Trueness was 25 µm and precision was 10 µm. Mean precision within scans was 4 µm. Automatic method: Trueness was 26 µm and precision was 11 µm. All test values showed sharp significant deviations from the reference value but were well within range of clinical acceptance.Conclusions. Within the limitations of this in vitro study, the standardized in vitro test described can be used manually or with the automatic function Fitting Sphere for determining the accuracy of intraoral scanners. Further studies need to be performed on more complex objects. The commercial intraoral scanner (TRIOS) demonstrates a high level of trueness and precision which is comparable with or better than that shown with traditional impression methods.

The patterned interactions in a support group for adolescent mothers are analyzed in the context of the specific construction(s) of adolescent pregnancy and motherhood that legitimate the program's existence. Particular attention is paid to the way in which staff and clients are positioned vis a vis one another through the typification of the program's mission and goals. Data analyzed include field notes recorded during ten months of participant observation with the group, program documents describing the history, mission, and goals of the program, and an in-depth interview with the Program Director. Changes in funding patterns led to an increased emphasis on the prevention of child abuse as a goal of the program. The resulting expectations of program staff and assumptions about adolescent mothers cast these two groups of women into social identities containing inherent contradictions. Differences of social class further complicate the relationship between the groups. Varying strategies of self-presentation are employed by clients and staff as they struggle with these contradictions. The young mothers present themselves in ways that maintain distance between themselves and staff. While the staff are never completely successful and breaking down the barriers between themselves and the young mothers, one style of self-presentation has the potential to bridge the gap. The findings have practical implications for the design and implementation of human service programs, particularly those which address stigmatized categories of women. The findings also have theoretical implications relevant to ongoing discussions of feminist epistemology, and the intersection of gender and social class. / Ph. D.

Significant research in cultural psychology has underlined differences in Eastern and Western cultures. While differences in many cognitive domains have been examined, there is a gap in cross cultural research on information processing and integration. This research explores the effect of independent or interdependent thinking on how a subject processes information. It is hypothesized that subjects with an interdependent mindset will process information holistically and subjects in an independent context will process information individually, or with an attribute based approach. A preliminary study tested the averaging and additive effects of information processing and served as the foundation for two subsequent explorations. The first examined cultural differences in information processing through presenting subjects of different cultural backgrounds with presenter and evaluator situations. In the second study, individualistic and collectivist priming methodology was used to prompt subjects' ability to process information individually or holistically. Established measures of religiosity and connectedness were examined as possible moderators of the relationship between self-construal and information integration. Results show that differences between subjects primed in the interdependent condition were moderated by religiosity. Possible explanations for this effect are discussed. / Master of Science