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Avaliação digital de preparações dentárias para coroas monolíticas em ambiente de ensino pré-clínico
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Introdução: A preparação dentária para coroas monolíticas é uma das competências base em Prótese Fixa a adquirir em ambiente pré-clínico. A convergência axial, avaliada pelo ângulo de convergência total/Total Occlusal Convergence (TOC), é determinante para a retenção e estabilidade das coroas, sendo a sua avaliação objetiva possibilitada pelo “prepCheck Pro” (Dentsply Sirona, Bensheim, Germany). Objetivo: Avaliar a evolução dos estudantes do 3.º ano do MIMD na convergência axial de preparações dentárias para coroas monolíticas, ao longo de um semestre, com recurso ao “prepCheck Pro”. Materiais e Métodos: Foram avaliadas 80 preparações dentárias realizadas por 40 estudantes da FMD-UCP (2025/2026), em dois momentos: início e final do semestre. As preparações foram executadas em dentes Frasaco® e digitalizadas com o Primescan (Dentsply Sirona). Analisou-se a TOC nos eixos vestíbulo-lingual e mesio distal e nas quatro paredes axiais, com teste t emparelhado, ANOVA de medidas repetidas, teste exato de Fisher e McNemar (α = 0,05). Resultados: Observou-se uma tendência descritiva de redução da TOC no eixo vestíbulo-lingual (12,96° para 11,41°) e mesio-distal (13,17° para 12,01°), sem significância estatística (p > 0,05), consistente com estudos que demonstram que melhorias mensuráveis requerem múltiplas sessões intercaladas. A proporção de preparos ideais não aumentou significativamente (p = 0,383 e p = 0,999). Verificou-se associação significativa entre o tipo de dente e a TOC no eixo vestíbulo-lingual (p = 0,027 e p=0,038). O “prepCheck Pro” revelou-se uma ferramenta objetiva e reprodutível. Conclusões: Um semestre de treino pré-clínico promoveu uma melhoria ligeira dos valores de TOC nesta amostra específica, sem atingir significância estatística. A análise das categorias revelou trajetórias individuais divergentes, sublinhando a necessidade de acompanhamento personalizado. Estudos longitudinais com múltiplas sessões, amostras maiores e integração do “prepCheck Pro” como ferramenta de feedback formativo são necessários para caracterizar a aquisição destas competências.
Introduction: Tooth preparation for monolithic crowns is one of the most demanding skills in preclinical dental education. Axial convergence, measured by the total occlusal convergence (TOC) angle, is a key determinant of crown retention and stability, with objective assessment made possible by “prepCheck Pro” (Dentsply Sirona, Bensheim, Germany). Objective: To assess the progress of third-year IMDM students in the axial convergence of tooth preparations for monolithic crowns over one semester, using “prepCheck Pro”. Materials and Methods: A total of 80 preparations by 40 students at FMD-UCP (2025/2026) were assessed at two time points: beginning and end of semester. Preparations were made on Frasaco® teeth and scanned with the Primescan intraoral scanner (Dentsply Sirona). TOC was analysed in the lingual-buccal and mesio-distal axes and across all four axial walls, using paired t-test, repeated measures ANOVA, Fisher's exact test and McNemar's test (α = 0.05). Results: A descriptive trend of TOC reduction was observed in the lingual-buccal (12.96° to 11.41°) and mesio-distal (13.17° to 12.01°) axes without statistical significance (p > 0.05), consistent with evidence that measurable improvements require multiple intercalated training sessions. The proportion of ideal preparations did not increase significantly (p = 0.383 and p = 0.999). A significant association was found between tooth type and TOC classification in the lingual-buccal axis (p = 0.027 and p = 0.038). “PrepCheck Pro” proved to be an objective and reproducible assessment tool. Conclusions: A semester of preclinical training led to a slight improvement in TOC scores in this specific sample, though this did not reach statistical significance. Analysis of the categories revealed divergent individual trajectories, underscoring the need for personalized monitoring. Longitudinal studies with multiple sessions, larger samples, and the integration of “prepCheck Pro” as a formative feedback tool are necessary to characterize the acquisition of these skills.
Introduction: Tooth preparation for monolithic crowns is one of the most demanding skills in preclinical dental education. Axial convergence, measured by the total occlusal convergence (TOC) angle, is a key determinant of crown retention and stability, with objective assessment made possible by “prepCheck Pro” (Dentsply Sirona, Bensheim, Germany). Objective: To assess the progress of third-year IMDM students in the axial convergence of tooth preparations for monolithic crowns over one semester, using “prepCheck Pro”. Materials and Methods: A total of 80 preparations by 40 students at FMD-UCP (2025/2026) were assessed at two time points: beginning and end of semester. Preparations were made on Frasaco® teeth and scanned with the Primescan intraoral scanner (Dentsply Sirona). TOC was analysed in the lingual-buccal and mesio-distal axes and across all four axial walls, using paired t-test, repeated measures ANOVA, Fisher's exact test and McNemar's test (α = 0.05). Results: A descriptive trend of TOC reduction was observed in the lingual-buccal (12.96° to 11.41°) and mesio-distal (13.17° to 12.01°) axes without statistical significance (p > 0.05), consistent with evidence that measurable improvements require multiple intercalated training sessions. The proportion of ideal preparations did not increase significantly (p = 0.383 and p = 0.999). A significant association was found between tooth type and TOC classification in the lingual-buccal axis (p = 0.027 and p = 0.038). “PrepCheck Pro” proved to be an objective and reproducible assessment tool. Conclusions: A semester of preclinical training led to a slight improvement in TOC scores in this specific sample, though this did not reach statistical significance. Analysis of the categories revealed divergent individual trajectories, underscoring the need for personalized monitoring. Longitudinal studies with multiple sessions, larger samples, and the integration of “prepCheck Pro” as a formative feedback tool are necessary to characterize the acquisition of these skills.
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Coroas Educação Preparação dentária Pré-clínico Prostodontia PrepCheck Dental crowns Education Tooth preparation Prosthodontics Preclinical
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