Duurzaamheidsonderzoek naar zirconium en titaniumabutments

Verschillende aspecten van solitaire implantaten in het front worden in onderzoeken met elkaar vergeleken. Vaakbetreft het onderzoek naar de levensduur van implantaten, de manier van plaatsing of de materialen waaruit die implantaten bestaan. Ook de duurzaamheid van diverse abutments is onderwerp van onderzoek. De resultaten van die onderzoeken laten geen grote verschillen zien tussen de beide materiaalsoorten.

To test the survival rates, and the technical and biological complication rates of customized zirconia and titanium abutments 5 years after crown insertion. Twenty-two patients with 40 single implants in maxillary and mandibular canine and posterior regions were included. The implant sites were randomly assigned to zirconia abutments supporting all-ceramic crowns or titanium abutments supporting metal-ceramic crowns. Clinical examinations were performed at baseline, and at 6, 12, 36 and 60 months of follow-up. The abutments and reconstructions were examined for technical and/or biological complications. Probing pocket depth (PPD), plaque control record (PCR) and Bleeding on Probing (BOP) were assessed at abutments (test) and analogous contralateral teeth (control). Radiographs of the implants revealed the bone level (BL) on mesial (mBL) and distal sides (dBL). Data were statistically analyzed with nonparametric mixed models provided by Brunner and Langer and STATA (P < 0.05). Eighteen patients with 18 zirconia and 10 titanium abutments were available at a mean follow-up of 5.6 years (range 4.5-6.3 years). No abutment fracture or loss of a reconstruction occurred. Hence, the survival rate was 100% for both. Survival of implants supporting zirconia abutments was 88.9% and 90% for implants supporting titanium abutments. Chipping of the veneering ceramic occurred at three metal-ceramic crowns supported by titanium abutments. No significant differences were found at the zirconia and titanium abutments for PPD (meanPPD 3.3 ± 0.6 mm, mPPD 3.6 ± 1.1 mm), PCR (mPCR 0.1 ± 0.3, mPCR 0.3 ± 0.2) and BOP (mBOP 0.5 ± 0.3, mBOP 0.6 ± 0.3). Moreover, the BL was similar at implants supporting zirconia and titanium abutments (mBL 1.8 ± 0.5, dBL 2.0 ± 0.8; mBL 2.0 ± 0.8, dBL 1.9 ± 0.8). There were no statistically or clinically relevant differences between the 5-year survival rates, and the technical and biological complication rates of zirconia and titanium abutments in posterior regions.

Bron

Zembic A, Bösch A, Jung RE, Hämmerle CH, Sailer I. Five-year results of a randomized controlled clinical trial comparing zirconia and titanium abutments supporting single-implant crowns in canine and posterior regions. Clin Oral Implants Res 2013; 24: 384-390. doi: 10.1111/clr.12044. Epub 2012 Oct 2.