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Publication
Medição de desgaste dentário com goteira guia : estudo in vitro
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Advisor(s)
Abstract(s)
Objetivo: Avaliar a eficácia de goteiras fresadas transparentes e opacas na medição de alterações mínimas de desgaste dentário com scanners intraorais. Materiais e Métodos: Simularam-se vários tipos de lesões de desgaste dentário num modelo de arcada superior padronizado formando seis grupos: com ou sem goteira (transparente ou opaca), e com ou sem desgaste. Foram realizadas 10 impressões para cada grupo, com cada um dos scanners intraorais (CEREC Primescan e 3Shape TRIOS 5) e o scanner extraoral (Zirkonzahn S600 ARTI). As goteiras foram desenhadas com marcas de referência para facilitar o alinhamento dos scans. O software Geomagic Control XTM, com a ferramenta "Best-fit alignment", foi utilizado para analisar desvios angulares e de translação entre os scans. Foram realizadas cinco análises 3D com diferentes alinhamentos, e o desvio foi medido usando o valor "Root Mean Square" (RMS). Os desvios foram então comparados estatisticamente para avaliar a eficácia da goteira na sobreposição dos scans. Resultados: O alinhamento/best fit direto nos próprios dentes apresentou os valores de RMS mais baixos, independentemente da presença de goteira ou de desgaste dentário, com diferença estatisticamente significativa em relação aos outros métodos de alinhamento (p<0,05). O scanner extraoral demonstrou maior precisão comparativamente aos intraorais. A translucidez da goteira dificultou a leitura apenas no scanner extraoral. Conclusão: O uso de goteira com pontos de referência não melhora o alinhamento dos scans nem a medição de desgaste, tendo o alinhamento nos próprios dentes, onde se pretende medir o desgaste, resultado em melhor precisão.
Objective: To evaluate the efficacy of transparent and opaque milled splints in detecting minimal changes in tooth wear using intraoral scanners. Materials and Methods: Different types of dental tooth wear were simulated on a standardized upper arch model, forming six groups: with or without a splint (transparent or opaque) and with or without wear. 10 impressions were taken for each group, with each of the intraoral scanners (CEREC Primescan and 3Shape TRIOS 5) and the extraoral scanner (Zirkonzahn S600 ARTI). The splints were designed with reference marks to aid in scan alignment. The software Geomagic Control XTM, using the "Best-fit alignment" tool, was employed to analyze angular and translational deviations between scans. Five 3D analyses with different alignments were conducted, and deviation was measured using the "Root Mean Square" (RMS) value. The deviations were then statistically compared to evaluate the effectiveness of the splint in scan superimposition. Results: Direct alignment/best fit on the teeth themselves showed the lowest RMS values, regardless of the presence of a splint or dental wear, with a statistically significant difference compared to other alignment methods (p<0.05). The extraoral scanner demonstrated higher accuracy compared to the intraoral scanners. The translucency only affected reading in the extraoral scanner. Conclusion: The use of a splint with reference points does not improve scan alignment or wear measurement. The best-fit alignment on the teeth themselves, where the wear is intended to be measured, resulted in greater precision.
Objective: To evaluate the efficacy of transparent and opaque milled splints in detecting minimal changes in tooth wear using intraoral scanners. Materials and Methods: Different types of dental tooth wear were simulated on a standardized upper arch model, forming six groups: with or without a splint (transparent or opaque) and with or without wear. 10 impressions were taken for each group, with each of the intraoral scanners (CEREC Primescan and 3Shape TRIOS 5) and the extraoral scanner (Zirkonzahn S600 ARTI). The splints were designed with reference marks to aid in scan alignment. The software Geomagic Control XTM, using the "Best-fit alignment" tool, was employed to analyze angular and translational deviations between scans. Five 3D analyses with different alignments were conducted, and deviation was measured using the "Root Mean Square" (RMS) value. The deviations were then statistically compared to evaluate the effectiveness of the splint in scan superimposition. Results: Direct alignment/best fit on the teeth themselves showed the lowest RMS values, regardless of the presence of a splint or dental wear, with a statistically significant difference compared to other alignment methods (p<0.05). The extraoral scanner demonstrated higher accuracy compared to the intraoral scanners. The translucency only affected reading in the extraoral scanner. Conclusion: The use of a splint with reference points does not improve scan alignment or wear measurement. The best-fit alignment on the teeth themselves, where the wear is intended to be measured, resulted in greater precision.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Alinhamento de melhor ajuste Scanner Intraoral Desgaste dentário Análise scans 3D