Does the Thickness and Translucency of CAD/CAM Blocks Affect the Polymerization of Resin Cements with Different Structures?

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Dağdelen Ahısha C., Üçtaşlı M. B.

ceramics, cilt.9, ss.1-15, 2026 (ESCI, Scopus)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 9
  • Basım Tarihi: 2026
  • Doi Numarası: 10.3390/ceramics9090101
  • Dergi Adı: ceramics
  • Derginin Tarandığı İndeksler: Scopus, Emerging Sources Citation Index (ESCI)
  • Sayfa Sayıları: ss.1-15
  • Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
  • Gazi Üniversitesi Adresli: Evet

Özet

This study evaluated the effects of CAD/CAM material thickness and translucency on the

Vickers microhardness and bottom-to-top hardness ratio of adhesive and self-adhesive

resin cements. Eighty specimens (n = 10 per group) were prepared using RelyX Ultimate

and RelyX U200. Resin cements were light-activated through lithium disilicate-reinforced

CAD/CAM blocks (Initial LiSi Block) with two thicknesses (2 and 4 mm) and two translucency

levels (high translucency [HT] and low translucency [LT]). Vickers microhardness

was measured on the top and bottom surfaces after 24 h, and the bottom-to-top hardness

ratio was calculated as a relative hardness-based indicator of polymerization-related mechanical

performance. Increasing block thickness from 2 to 4 mm significantly reduced the

bottom-to-top hardness ratio for both resin cements under both translucency conditions

(p ≤ 0.008). High-translucency blocks produced significantly higher microhardness values

than low-translucency blocks for both cements at both thicknesses (p = 0.001). The effect of

thickness on microhardness varied according to cement type and translucency. For RelyX

Ultimate, the bottom-to-top hardness ratio was significantly higher under 2 mm HT than

2 mm LT conditions (p = 0.006). Within the limitations of this study, greater CAD/CAM

thickness and lower translucency were associated with less favorable polymerizationrelated

mechanical performance.