112,297 research outputs found
Dense hydroxyapatite inserted into postextraction sockets: a histologic and histomorphometric 20-year case report.
No full textThe biologic behavior, i.e., the degradation of hydroxyapatite (HA) in the human body, is of relevance for clinicians. The present investigation is a long-term (20-year) histologic and histomorphometric evaluation of dense HA used in postextraction sockets.Dense HA particles were used in a patient in postextraction alveolar sockets to maintain the alveolar ridge height. The patient returned after 20 years for implant treatment. A ridge remodeling was necessary during implant insertion surgery, and the HA/bone tissue was harvested with bone-cutting forceps from the canine and premolar area. The specimen was processed for histology and histomorphometry at the Implant Retrieval Centre, Dental School, University of Chieti-Pescara.Most of the particles (56\%) were surrounded partially by bone, whereas some particles (39\%) were surrounded completely. At higher magnification, bone was in close contact with the particles, and neither gaps nor fibrous tissues were present at the bone-biomaterial interface. Microscopically, the particles had a dense appearance. In only a few fields, it was possible to observe that the outer part of some particles had detached from the original particles' surface. Histomorphometry showed that bone represented 25.4\% +/- 3.2\%, marrow spaces represented 41.3\% +/- 5.2\%, and residual HA particles represented 38.1\% +/- 4.1\%.Intimate binding between bone and HA particles was present after a long-term implantation period (20 years). The fact that HA particles were surrounded closely by bone is very promising for the long-term stability of the augmentation
Clinical and Histologic Analysis of CalciumSulfate in Treatment of a Post-ExtractionDefect: A Case Report
No full textAbstarct: We report a case of a postextraction
maxillary buccal dehiscence
grafted with calcium sulfate to insert
a dental implant. The clinical results
were supported by histologic analysis
of two specimens collected in the
healed socket to better understand
the biologic effects of calcium sulfate.
A 42-year-old white female presented
with an almost totally edentulous
maxillary right arch with a
wide postextraction defect in the canine
region. Calcium sulfate mixed
with sterile saline solution to a
putty-like consistency was packed
into the defect, and four dental implants
were placed in the edentulous
ridge. On re-entry, a dental implant
and small amounts of calcium sulfate
were placed in the grafted site.
After 5 months, a specimen of the
region implanted with calcium sulfate
was retrieved for histologic
evaluation. On surgical re-entry, a
complete filling of the defect with
mature, dense, newly formed bone
occurred. Complete resorption of
the grafted material and its substitution
with newly formed bone tissue
were confirmed by histologic analysis.
All of the implants appeared to
be osseointegrated successfully, and
the patient was provided with a fixed
implant-supported prosthesis. Calcium
sulfate represents an aid in
bone regeneration procedures. (Implant
Dent 2005;14:82– 87)
Key Words: bone regeneration, calcium
sulfate, histology, dental implants,
guided bone regeneration
UTILIZZO DELLE GRIGLIE IN TITANIO PER LA RIABILITAZIONE DEI MASCELLARI ATROFICI CON O SENZA L'APPLICAZIONE SIMULTANEA DI IMPIANTI: REVISIONE CRITICA DELLA LETTERATURA
No full text
author-bios-SRD-19-0063.R1 – Supplemental material for The Network Structure of Police Misconduct
No full textSupplemental material, author-bios-SRD-19-0063.R1 for The Network Structure of Police Misconduct by George Wood, Daria Roithmayr and Andrew V. Papachristos in Socius</p
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