Does the choice of the measuring technique affect the comparison of fit between zirconia and cobalt-chromium prostheses?
J Indian Prosthodont Soc
; 24(2): 201-207, 2024 Apr 01.
Article
em En
| MEDLINE
| ID: mdl-38650346
ABSTRACT
AIMS:
The objectives of the study were to compare the adaptation of presintered zirconia and cobalt- chromium prostheses using microcomputed tomography (µCT), scanning electron microscopy (SEM), and stereomicroscope (SM). MATERIALS ANDMETHODS:
Twenty-four fixed dental prostheses (FDPs) were fabricated on metal abutments, duplicated from maxillary first premolar and first molar prepared on a typodont model. Teeth were reduced to obtain chamfer of 1.2 mm and reduction occlusaly of 2 mm occlusal. Scanning of the abutments was done with random assignment to two groups receiving the FDPs made from soft-milled Co-Cr (n = 12) and zirconia (n = 12). Marginal and internal gaps were assessed using three evaluation techniques (X-ray microcomputer tomography, SEM, and stereomicroscopy). STATISTICAL ANALYSIS USED Comparison of the results was made using Levene and analysis of variance tests (α =0.05).RESULTS:
Irrespective of the material tested, statistical differences were found between the measuring techniques (P = 0.001 overall); the obtained mean gaps were for CT scan (92.60 ± 13.31), for SEM (101.92 ± 23.03), and for SM (113.44 ± 14.68) the multiple comparisons between techniques found a significant difference between CT and SM (P < 0.001), and SEM and SM (P = 0.025). When materials were compared within each measuring technique, Co-Cr showed lower values compared to zirconia in SEM (P < 0.001) and Stereo (P = 0.049); similar results were found in CT.CONCLUSIONS:
Results values differed with the chosen measuring technique. Co-Cr prostheses had a better fit than zirconia prostheses in SEM and Stereo. µCT showed comparable results to SEM, smaller than SM results.
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Zircônio
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Microscopia Eletrônica de Varredura
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Ligas de Cromo
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Microtomografia por Raio-X
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article