Abstract:
Objectives: The aim of this study was to conduct a comparative qualitative and quantitative assessment of the interfacial soft and hard tissues investingimplants and natural teeth. Materials and methods: The test sample consisted of six adult healthy male Macaca fascicularis with three-unit splinted crowns, each crown supported by an Ankylos screw-shaped titanium implant. These implants were placed in the mandibular premolar-second molar region, one side by an immediateloading (IL) and the other by delayed-loading (DL) protocol. The animals were sacrificed after 3 months of functional loading. Another two monkeys with natural dentition served as controls. Nondecalcified sections were prepared for assessment of optical intensities (OI) under a confocal laser scanning microscope. Results: In both the test (IL and DL) and control, the soft tissue complexes demonstrated a highly fluorescent keratinized layer and diminished cytoplasmic and enhanced membranous fluorescence in the remaining epithelium. Peri-implant mucosa was further characterized by an intense fluorescence at thejunctional epithelium-implant interface and in the stromal mononuclear infiltrate. Connective tissue contact and periodontal ligament were weakly fluorescent.In hard tissues, a high fluorescence was observed in peri-implant woven bone and along the implant-bone interface. Mean OI was significantly higher in peri-implant woven bone than around teeth (P<0.05). In the remaining soft and hard tissue complexes, no significant differences in mean OI between the test and control were observed (P>0.05). Conclusions: Present findings suggest that peri-implant woven bone is highly mineralized, while the peri-implant and gingival mucosa share structural similarities. Clinical relevance: Optical intensities of interfacial tissues investing implants and teeth are related to their biological properties. Source: CLINICAL ORAL INVESTIGATIONS Status: A paid open access option is available for this journal at Springer Please cite as: Siar CH, Toh CG, Romanos GE, Ng KH. Comparative assessment of the interfacial soft and hard tissues investing implants and natural teeth in the macaque mandible. Clinical Oral Invesigation, 2015; 19(6): 1353-1362
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