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[Effect of occlusal thickness design on the fracture resistance of endocrowns restored with lithium disilicate ceramic and zirconia].
Lin, Zhen-Xiang; Pan, Zai-Xing; Ye, Qi-Qing; Zheng, Zhi-Qiang; Lin, Jie.
Afiliación
  • Lin ZX; Dept. of Stomatology, Fujian Provincial Governmental Hospital, Fuzhou 350001, China.
  • Pan ZX; Dept. of Stomatology, Fujian Provincial Governmental Hospital, Fuzhou 350001, China.
  • Ye QQ; Dept. of Stomatology, Fujian Provincial Governmental Hospital, Fuzhou 350001, China.
  • Zheng ZQ; Dept. of VIP Dental Service, School and Hospital of Stomatology, Fujian Medical University, Fuzhou 350002, China.
  • Lin J; Dept. of VIP Dental Service, School and Hospital of Stomatology, Fujian Medical University, Fuzhou 350002, China.
Hua Xi Kou Qiang Yi Xue Za Zhi ; 38(6): 647-651, 2020 Dec 01.
Artículo en Chino | MEDLINE | ID: mdl-33377341
ABSTRACT

OBJECTIVE:

This study aimed to investigate the effect of occlusal thickness design on fracture resistance of endocrowns restored with lithium disilicate ceramic and zirconia.

METHODS:

A total of 24 artificial first mandibular molars were randomly divided into four groups with six teeth in each group as follows group lithium disilicate ceramic-2 mm (lithium disilicate ceramic, with an occlusal thickness of 2 mm and a retainer length of 4 mm); group lithium disilicate ceramic-4 mm (lithium disilicate ceramic, with an occlusal thickness of 4 mm and a retainer length of 2 mm); group zirconia-2 mm (zirconia, with an occlusal thickness of 2 mm and a retainer length of 4 mm); and group zirconia-4 mm (zirconia, with an occlusal thickness of 4 mm and a retainer length of 2 mm). After adhesive cementation (RelyX Ultimate Clicker), all specimens were subjected to thermocycling (10 000 cycles). The specimens were subjected to fracture resistance testing at a 135° angle to the teeth at a crosshead speed of 0.5 mm·min⁻¹ in a universal testing machine. Data were analyzed with ANOVA and Tukey's HSD test by SPSS 15.0. The failure modes were classified.

RESULTS:

The fracture resistances of groups lithium disilicate ceramic-2 mm, lithium disilicate ceramic-4 mm, zirconia-2 mm, and zirconia-4 mm were (890.54±83.41), (2 320.87±728.57), (2 258.05±557.66), and (3 847.70±495.99) N respectively. Group zirconia-4 mm had the highest fracture resistance, whereas group lithium disilicate ceramic-2 mm had the lowest.

CONCLUSIONS:

The fracture resistance of molar endocrown with zirconia is higher than that with lithium disilicate ceramic. Increasing the occlusal thickness can improve the fracture resistance but increase the risk of fracture of abutment.
Asunto(s)
Texto completo: Disponible Colección: Bases de datos internacionales Base de datos: MEDLINE Asunto principal: Fracaso de la Restauración Dental / Coronas Idioma: Chino Revista: Hua Xi Kou Qiang Yi Xue Za Zhi Asunto de la revista: Odontología Año: 2020 Tipo del documento: Artículo País de afiliación: China

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Texto completo: Disponible Colección: Bases de datos internacionales Base de datos: MEDLINE Asunto principal: Fracaso de la Restauración Dental / Coronas Idioma: Chino Revista: Hua Xi Kou Qiang Yi Xue Za Zhi Asunto de la revista: Odontología Año: 2020 Tipo del documento: Artículo País de afiliación: China
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