PURPOSE: To evaluate in vivo collagen fiber behavior around two different dental implant necks placed in the mandibular bone of adult pigs. MATERIALS AND METHODS: Scanning electron microscopic (SEM) and profilometric analyses were performed on both types of implant necks to evaluate the different surface morphology. Ten dental implants with machined titanium necks and 20 implants with zirconia necks were inserted into the mandibles of five adult pigs. Three months later, the animals were sacrificed; samples from the peri-implant mucosa were obtained and prepared for histologic analysis. Evaluation of collagen fiber orientation in the connective tissue surrounding the implant necks was performed by polarized light microscopy. Inflammation in the peri-implant soft tissues was also measured via the Gingival Index. RESULTS: Postoperative healing was uneventful; all implants, except for one of each type, were osseointegrated after 3 months. SEM and profilometric analyses confirmed that zirconia necks showed Ra, Rq, and Rz values that were lower than those seen around the titanium necks. Histologic observation indicated that collagen fiber orientation was similar for both types of implants. The majority of fibers showed a parallel or parallel-oblique orientation to the implant surface for all samples. Implants that were not osseointegrated, as determined by clinical evaluation, showed inflammatory infiltrate, whereas healthy connective tissue was found around all the other implant necks. CONCLUSIONS: Collagen fiber orientation was similar, regardless of implant material, demonstrating a predominantly parallel or parallel-oblique pattern. Moreover, zirconia, which is used as a transgingival collar on some implants, showed connective tissue adhesion that was similar to that seen on the machined titanium surface, but demonstrated limited plaque formation and may provide better esthetics.
PURPOSE: To evaluate in vivo collagen fiber behavior around two different dental implant necks placed in the mandibular bone of adult pigs. MATERIALS AND METHODS: Scanning electron microscopic (SEM) and profilometric analyses were performed on both types of implant necks to evaluate the different surface morphology. Ten dental implants with machined titanium necks and 20 implants with zirconia necks were inserted into the mandibles of five adult pigs. Three months later, the animals were sacrificed; samples from the peri-implant mucosa were obtained and prepared for histologic analysis. Evaluation of collagen fiber orientation in the connective tissue surrounding the implant necks was performed by polarized light microscopy. Inflammation in the peri-implant soft tissues was also measured via the Gingival Index. RESULTS: Postoperative healing was uneventful; all implants, except for one of each type, were osseointegrated after 3 months. SEM and profilometric analyses confirmed that zirconia necks showed Ra, Rq, and Rz values that were lower than those seen around the titanium necks. Histologic observation indicated that collagen fiber orientation was similar for both types of implants. The majority of fibers showed a parallel or parallel-oblique orientation to the implant surface for all samples. Implants that were not osseointegrated, as determined by clinical evaluation, showed inflammatory infiltrate, whereas healthy connective tissue was found around all the other implant necks. CONCLUSIONS: Collagen fiber orientation was similar, regardless of implant material, demonstrating a predominantly parallel or parallel-oblique pattern. Moreover, zirconia, which is used as a transgingival collar on some implants, showed connective tissue adhesion that was similar to that seen on the machined titanium surface, but demonstrated limited plaque formation and may provide better esthetics.
Authors: Noah Z Laird; Walla I Malkawi; Jaidev L Chakka; Timothy M Acri; Satheesh Elangovan; Aliasger K Salem Journal: J Tissue Eng Regen Med Date: 2020-03-04 Impact factor: 3.963
Authors: Wen L Chai; Ian M Brook; Anders Palmquist; Richard van Noort; Keyvan Moharamzadeh Journal: J R Soc Interface Date: 2012-08-22 Impact factor: 4.118
Authors: Katharina Kuhn; Heike Rudolph; Michael Graf; Matthias Moldan; Shaoxia Zhou; Martin Udart; Andrea Böhmler; Ralph G Luthardt Journal: Trials Date: 2015-10-15 Impact factor: 2.279
Authors: Hyun-Chang Lim; Ronald Ernst Jung; Christoph Hans Franz Hämmerle; Myong Ji Kim; Kyeong-Won Paeng; Ui-Won Jung; Daniel Stefan Thoma Journal: J Periodontal Implant Sci Date: 2018-06-30 Impact factor: 2.614