Biodegradation, soft and hard tissue integration of various polyethylene glycol hydrogels: a histomorphometric study in rabbits

• Published in: Clinical oral implants research 2011-11, Vol.22 (11), p.1247-1254
• Main Authors: Thoma, D. S., Subramani, K., Weber, F. E., Luder, H. U., Hämmerle, C. H. F., Jung, R. E.
• Format: Article
• Language: English
• Subjects: Absorbable Implants; Amino Acid Sequence; Animals; barrier membrane; Biocompatible Materials - chemistry; Bone Diseases - pathology; Bone Diseases - surgery; Bone Matrix - pathology; Bone Regeneration - physiology; Calcification, Physiologic - physiology; Chemical Phenomena; Collagen - chemistry; Connective Tissue - pathology; degradation; Dentistry; Dioxanes - chemistry; Fibroblasts - pathology; Frontal Bone - pathology; Frontal Bone - surgery; guided bone regeneration; Hydrogels - chemistry; Lactic Acid - chemistry; membranes; Membranes, Artificial; Oligopeptides - chemistry; Osteogenesis - physiology; Parietal Bone - pathology; Parietal Bone - surgery; polyethylene glycol; Polyethylene Glycols - chemistry; Polyglycolic Acid - chemistry; polygycolide; polylactide; Rabbits; Random Allocation; RGD; soft tissue integration; Subcutaneous Fat - pathology; Surface Properties; Time Factors
• ISSN: 0905-7161; 1600-0501
• DOI: 10.1111/j.1600-0501.2010.02075.x

Objectives: (i) To evaluate biodegradation, hard and soft tissue integration using various polyethylene glycol (PEG) hydrogels; (ii) to evaluate the influence of arginine–glycine–aspartic acid (RGD) on two types of PEG hydrogels. Material and methods: In seven rabbits, six treatment modalities were randomly applied subperiosteally on the skull: (1) a dense network PEG hydrogel (PEG1), (2) PEG1 modified with RGD (PEG1‐RGD), (3) a looser network PEG hydrogel (PEG2), (4) PEG2 modified with RGD (PEG2‐RGD), (5) a collagen membrane, and (6) a polylactide/polyglycolide/trimethylene carbonate membrane. The animals were sacrificed at 14 days. Histomorphometric analyses were performed on undecalcified Epon sections using a standardized region of interest. For statistical analysis, paired t‐test and signed rank test were applied. Results: PEG1 and PEG1‐RGD remained intact and maintained the shape. PEG2 and PEG2‐RGD completely degraded and were replaced by connective tissue and bone. The largest amount of mineralized tissue was found for PEG2‐RGD (21.4%), followed by PEG 2 (9.5%). The highest percentage of residual hydrogel/membrane was observed for PEG1‐RGD (55.6%), followed by PEG1 (26.7%). Conclusions: Modifications of the physico‐chemical properties of PEG hydrogels and the addition of RGD influenced soft and hard tissue integration and biodegradation. PEG1 showed an increased degradation time and maintained the shape. The soft tissue integration was enhanced by adding an RGD sequence. A high turn‐over rate and extensive bone regeneration was observed using PEG2. The addition of RGD further improved bone formation and soft tissue integration. To cite this article: 
Thoma DS, Subramani K, Weber FE, Luder HU, Hämmerle CHF, Jung RE. Biodegradation, soft and hard tissue integration of various polyethylene glycol hydrogels: a histomorphometric study in rabbits.
Clin. Oral Impl. Res. 22, 2011; 1247–1254.
doi: 10.1111/j.1600‐0501.2010.02075.x