The Influence of Milling Speed on the Internal Fit of Ceramic Laminate Veneers. An In-Vitro Study | ||||
| Egyptian Dental Journal | ||||
| Volume 71, Issue 3 - Serial Number 4, July 2025, Page 2469-2479 PDF (2.18 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/edj.2025.386139.3487 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Samaa Nagy Kotb   ; Hayat Ibrahim Mahrous El Banna
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| Lecturer of Fixed Prosthodontics, Faculty of Dentistry, Cairo University | ||||
| Abstract | ||||
| Objective: This in-vitro study evaluated the internal fit of ultra-translucent zirconia and lithium disilicate laminate veneers using two milling protocols (normal and fast milling). Materials and Methods: Forty-four laminate veneers were fabricated for a typodont central incisor veneer preparation . The samples were divided into four groups (n=11): (Groups LN and LF) - lithium disilicate glass ceramic normal milling and fast milling respectively ; (Groups ZN and ZF) ultra-translucent zirconia normal and fast milling respectively . Digital impression was made using an intraoral scanner, and veneers were designed and fabricated using CAD/CAM software. Internal fit was evaluated using the triple scan technique, recorded in micrometers (μm) as root mean square (RMS) values. Results: Ultra-translucent zirconia demonstrated significantly better internal fit (mean RMS: 229.7 ± 15.5 μm) compared to lithium disilicate (mean RMS: 260.6 ± 15.3 μm), regardless of the milling protocol used (p < 0.05). No significant difference was found in RMS values between normal milling (245.7 ± 22.5 μm) and fast milling (244.6 ± 21.1 μm) when averaged across materials (p > 0.05). Group ZF exhibited the best internal fit (227.8 ± 14.4 μm) among all groups, while Group LF showed the poorest adaptation (261.5 ± 10.8 μm). Conclusions: Ultra-translucent zirconia laminate veneers exhibited superior internal fit compared to lithium disilicate veneers. The milling protocol didn't affect the overall internal fit, therefore fast milling can be used without compromising adaptation. These findings support the use of ultra-translucent zirconia for laminate veneers, particularly when using fast milling protocols. | ||||
| Keywords | ||||
| laminate veneers; internal fit; lithium disilicate; ultra-translucent zirconia; milling protocols | ||||
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