Influence of regular cover screw or 2 mm healing abutment on bone gain after conventional GBR: A randomised controlled clinical tria
| Author | Affiliation |
|---|---|
Vilniaus implantologijos centro klinika | |
Aužbikavičiūtė, Viktorija | UAB „Vilniaus implantologijos centro klinika“ |
Vindašiūtė-Narbutė, Eglė | UAB Vilniaus implantologijos centro klinika |
| Date |
|---|
2019-11-26 |
Poster Display Clinical Research - Surgery.
ISSN 1600-0501 (Electronic) 0905-7161 (Linking).
Background : At least 1 mm bone around dental implant collar is essential for long term functional and aesthetic results of implant treatment. Resorbable collagen membrane and bone substitute mixed 1- 1 is recommended to use for GBR and is well documented. Nevertheless, despite big amount of graft is placed, the bone does not grow enough in the buccal site and small implant dehiscence is seen very often in cases when implant was covered with cover screw. One of the reasons may be a big pressure to implant neck. Aim/Hypothesis : Hypothesis- 2 mm healing abutment could be used instead of cover screw to relieve the pressure of the tissues to implant neck. Aim- To investigate efficiency of 2 mm healing abutment by increasing bone gain around implant neck buccally after GBR. Material and Methods : This study evaluated 40 implants with platform switching in 40 patients with class III (Howel&Cawood) lateral bone deficiency. Randomly patients were divided in to 2 groups- Test (T) group ( N = 20) (implant placement with 2 mm healing abutment) and control (C) group ( N = 20) (implant placement with cower screw). Allogenic bone mixed with autogenous chips and covered with resorbable collagen membrane were used for GBR for all patients. Implant dehiscence was measured before bone augmentation and during second stage after 6 months using periodontal probe vertically and with calliper - horizontally. Implant neck buccal margin was taken as reference point. The normality of the distribution was assessed using Kolmogorov- Smirnov test. Mann- Whitney u- test was used to evaluate differences between two independent groups with non- normally distributed data. Results : Implant vertical dehiscence before bone augmentation was −3.6 ± 1.12 mm in group T, and −3.6 ± 1.1 mm in group C. Horizontally all implants were not covered by the bone, also starting point was 0. After augmentation, bone vertically was 0.9 ± 0.0,77 mm in [...].