Fracture strength and marginal gap comparisons of monolayered and multilayered monolithic zirconia crowns with various milling depths.

Zengin G., Kanat-Ertürk B., Dündar-Çömlekoğlu M.

The journal of advanced prosthodontics, cilt.17, sa.5, ss.304-314, 2025 (SCI-Expanded, Scopus)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 17 Sayı: 5
  • Basım Tarihi: 2025
  • Doi Numarası: 10.4047/jap.2025.17.5.304
  • Dergi Adı: The journal of advanced prosthodontics
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.304-314
  • Kocaeli Üniversitesi Adresli: Evet

Özet

PURPOSE. This study aimed to compare the marginal adaptation and fracture

strength of monolayered and multilayered monolithic zirconia crowns fabricated

at three distinct milling depths. MATERIALS AND METHODS. Eighty-four epoxy

resin dies of prepared premolars were fabricated. Crowns were designed in

software and milled from two monolayered zirconia materials [3Y-TZP (VITA

YZ HT)(3-VYZ) and 4Y-TZP (Priti®multidiscZrO2 Extra Translucent)(4-ET)],

three multilayered zirconia materials [3/5Y-TZP (IPS e.maxZirCAD Prime)(3/5-

ZP), 4/5Y-TZP (IPS e.maxZirCAD Prime Esthetic)(4/5-ZPE), and 4/5Y-TZP

(Priti®multidiscZrO2 Multi Translucent Plus)(4/5-MTP)], at three milling depths

[above (A), center (C), below (B)], and a zirconia-reinforced lithium silicate glass

ceramic block (VITA Suprinity)(VS) (n = 7). After sintering and glazing, marginal

gaps (MG) were measured using silicone replica technique. Crowns were

cemented with dual-cure resin (SpeedCEM Plus, Ivoclar Vivadent), subjected to

5000 thermal cycles. Fracture strength (FS) test was performed perpendicularly

to occlusal surface at 1 mm/min. Data were analyzed (SPSS 26, one-way ANOVA,

Tukey post-hoc tests, P = .05), and fracture types were classified. SEM analysis

was performed on representative specimens. RESULTS. MG differences among

groups were insignificant (P > .05). The highest FS values were observed in 3-VYZ

(1587.14 ± 228.26 N), 3/5ZP-B (1537.28 ± 268.81 N), and 4-ET (1364.86 ± 196.98

N) (P < .05). The lowest FS values were found in VS (483.86 ± 47.10 N)(P < .05).

B-positioned multilayered crowns exhibited numerically higher FS than A or

C positions. CONCLUSION. Monolayered (3Y-TZP and 4Y-TZP) or multilayered

3/5Y-TZP zirconia milled from below layer may be preferred for posterior region,

whereas multilayered 3/5Y-TZP milled from upper layer and all configurations

of multilayered 4/5Y-TZP may be more suitable for anterior.