Five-year results of a randomized controlled clinical trial comparing zirconia and titanium abutments supporting single-implant crowns in canine and posterior regions
, , , , . 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 Impl. Res. 0, 2012; 1–7. doi: 10.1111/clr.12044Abstract
Objectives
To
test the survival rates, and the technical and biological complication
rates of customized zirconia and titanium abutments 5 years after crown
insertion.
Material and methods
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).
Results
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 (meanPPDZrO23.3 ± 0.6 mm, mPPDTi3.6 ± 1.1 mm), PCR (mPCRZrO20.1 ± 0.3, mPCRTi0.3 ± 0.2) and BOP (mBOPZrO20.5 ± 0.3, mBOPTi0.6 ± 0.3). Moreover, the BL was similar at implants supporting zirconia and titanium abutments (mBLZrO21.8 ± 0.5, dBLZrO22.0 ± 0.8; mBLTi2.0 ± 0.8, dBLTi1.9 ± 0.8).
Conclusions
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.
Comments