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New Implant Materials
No full text: In the last forty years, dental implantology has become a widespread worldwide clinical practice in medicine, able to rehabilitate partial or full human edentulism of the jaw and highly successful over the long term [...]
Collagen fiber orientation around machined titanium and zirconia dental implant necks: an animal study
No full textTo evaluate in vivo collagen fiber behavior around two different dental implant necks placed in the mandibular bone of adult pigs
ESPRESSIONE DELLA PROTEINA CITOPLASMATICA VEGF ALL' INTERNO DI GEMME DENTALI MEDIANTE METODICA IMMUNOISTOCHIMICA
No full text
Bone Inflammation, Bone Infection and Dental Implants Failure: Histological and Cytological Aspects Related to Cement Excess
No full textBackground: Dental implant failure can recognize several causes and many of them are quite preventable with the right knowledge of some clinical critical factors. Aim of this paper is to investigate about the histological aspects related to dental implants failure in such cases related to cement excess, how such histological picture can increase the risk of bacterial infections and how the different type of cement can interact with osteoblasts in-vitro. Methods: We randomly selected 5 patients with a diagnosis of dental implant failure requiring to be surgically removed: in all patients was observed an excess of dental cement around the failed implants. Histological investigations were performed of the perimplant bone. Cell culture of purchased human Osteoblasts was performed in order to evaluate cell proliferation and cell morphology at 3 time points among 3 cement types and a control surface. Results: Dental cement has been related to a pathognomonic histological picture with a foreign body reaction and many areas with black particles inside macrophage cells. Finally, cell culture on different dental cements resulted in a lower osteoblasts survival rate. Conclusions: It is appropriate that the dentist puts a small amount of dental cement in the prosthetic crown, so to avoid the clinical alterations related to the excess of cement
Collagen fiber orientation around machined titanium and zirconia dental implant necks: an animal study.
No full textPURPOSE:
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
Collagen fiber orientation around machined titanium and zirconia dental implant necks: an animal study.
No full textPURPOSE:
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
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