Novel CAD-CAM zirconia coping design to enhance the aesthetics and strength for anterior PLZ crowns.
Technol Health Care
; 29(6): 1161-1171, 2021.
Article
en En
| MEDLINE
| ID: mdl-33998567
ABSTRACT
BACKGROUND:
The aesthetics and strength of anterior porcelain layered zirconia (PLZ) crowns are mainly affected by the zirconia (Zr) coping design. There is a need for a modified design to enhance aesthetics with strength.OBJECTIVES:
The purpose of this study was to compare the fracture resistance of anterior PLZ crowns having modified CAD-CAM Zr coping designs (in terms of thickness and marginal collar designs) with standard Zr copings.METHODS:
Fifty PLZ crowns were fabricated and divided into two groups Gr 1 Standard Zr Coping (SZC) (control gr) with 0.5 mm thickness (Facial-F, Mesial-M, Distal-D, incisal-I, and Palatal-P) without a collar; Gr 2 Collar Zr Coping (CZC) (test gr) with 2.5 mm collar height on M, D, P and 0.2 mm F and variable facial wall thickness. Subgroups Gr 2a (CZC-0.5 mm) facial wall thickness 0.5 mm; Gr 2b (CZC-0.4 mm) facial wall thickness 0.4 mm; Gr 2c (CZC-0.3 mm) facial wall thickness 0.3 mm; Gr 2d (CZC-0.2 mm) facial wall thickness 0.2 mm. The fracture load was determined and analysed using One-way ANOVA and Dunnet test.RESULTS:
The minimum fracture load was 927.36 ± 127.80 N observed for Gr 2c (CZC at 0.3 mm) while the maximum fracture load was 1373.61 ± 146.54 N observed for Gr 2a (CZC at 0.5 mm). A highly significant difference in mean fracture load among various Zr coping groups (p< 0.001) was determined.CONCLUSIONS:
Novel Zr coping design for anterior PLZ crowns can provide better aesthetics with strength. Reducing the thickness of Zr coping in the aesthetic zone to 0.2 mm and providing a modified collar design (2.5 mm collar height on M, D, P, and 0.2 mm F) would provide strength without jeopardizing aesthetics.Palabras clave
Texto completo:
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Base de datos:
MEDLINE
Asunto principal:
Circonio
/
Diseño Asistido por Computadora
Límite:
Humans
Idioma:
En
Revista:
Technol Health Care
Asunto de la revista:
ENGENHARIA BIOMEDICA
/
SERVICOS DE SAUDE
Año:
2021
Tipo del documento:
Article
País de afiliación:
Arabia Saudita