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Purpose <p>This pilot randomized clinical trial compared peri-implant tissue health around milled cobalt-chromium (CoCr) versus polyether ether ketone (PEEK) secondary telescopic crowns in implant-retained mandibular overdentures over 12&#xa0;months.</p> Methods <p>&#xa0;Twelve completely edentulous patients received two implants each. After randomization, secondary crowns were fabricated from milled CoCr (n = 6 patients) or PEEK (n = 6 patients). Assessor-blinded outcome assessments such as marginal bone loss (MBL), probing depth (PD), and plaque index (PI) were performed at baseline, 6, 9, and 12&#xa0;months post-loading. Statistical analysis used the patient as the unit of analysis.</p> Results <p>&#xa0;No statistically significant inter-group differences were found at any time point. At 12&#xa0;months, mean MBL was 0.48 ± 0.15&#xa0;mm for CoCr and 0.45 ± 0.16&#xa0;mm for PEEK (<i>p</i> = 0.735). PD increased over time within groups but remained comparable between groups (CoCr: 2.58 ± 0.58&#xa0;mm, PEEK: 2.33 ± 0.41&#xa0;mm at 12&#xa0;months; <i>p</i> = 0.411). PI scores also showed no significant inter-group differences (<i>p</i> &gt; 0.05).</p> Conclusions <p>&#xa0;Over 12&#xa0;months, milled PEEK and CoCr secondary telescopic crowns demonstrated comparable peri-implant tissue health. PEEK presents a viable metal-free alternative for this application. These preliminary findings warrant confirmation in larger, long-term studies.</p>

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A randomized controlled pilot trial comparing peri-implant tissue health beneath CAD/CAM-milled PEEK versus cobalt-chromium telescopic crowns for mandibular overdentures

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月13日

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  • Iman A. El Asfahani,
  • Amr Khalifa,
  • Doaa Tawfik,
  • Emad Agamy,
  • Mahmoud G. Salloum

摘要

Purpose

This pilot randomized clinical trial compared peri-implant tissue health around milled cobalt-chromium (CoCr) versus polyether ether ketone (PEEK) secondary telescopic crowns in implant-retained mandibular overdentures over 12 months.

Methods

 Twelve completely edentulous patients received two implants each. After randomization, secondary crowns were fabricated from milled CoCr (n = 6 patients) or PEEK (n = 6 patients). Assessor-blinded outcome assessments such as marginal bone loss (MBL), probing depth (PD), and plaque index (PI) were performed at baseline, 6, 9, and 12 months post-loading. Statistical analysis used the patient as the unit of analysis.

Results

 No statistically significant inter-group differences were found at any time point. At 12 months, mean MBL was 0.48 ± 0.15 mm for CoCr and 0.45 ± 0.16 mm for PEEK (p = 0.735). PD increased over time within groups but remained comparable between groups (CoCr: 2.58 ± 0.58 mm, PEEK: 2.33 ± 0.41 mm at 12 months; p = 0.411). PI scores also showed no significant inter-group differences (p > 0.05).

Conclusions

 Over 12 months, milled PEEK and CoCr secondary telescopic crowns demonstrated comparable peri-implant tissue health. PEEK presents a viable metal-free alternative for this application. These preliminary findings warrant confirmation in larger, long-term studies.