Survival and success rate of spiral implants inserted mandible.

The rehabilitation of the edentulous mandible is a relatively common clinical problem and dentatl implants are popular medical device routinely use in daily practice. Recently a new type of two-piece spiral implants has been introduced in the market. Here a retrospective study is reported. A total of 54 two-piece implants were inserted in mandible in the period between June and December 2017, 30 in female and 24 in males. The median age was 53 ± 8. Implants replaced 11 incisors, 6 cuspids, 23 premolars and 14 molars. Implant' length was 10 mm, 11,50 mm and 13 mm in 16, 19 and 19 cases, respectively. Implant' diameter was 3.3 mm, 3.75 mm and 4.2 mm in 22, 13, 19 cases, respectively. Twenty two fixtures were placed in totally edentulous patient and 32 in partially edentulous subjects. There were 4 single crowns, 28 implants bearing two or greater bridges, 4 removable dentures and 18 supporting Toronto bridge. The overall mean follow-up was 13 ± 2 months. One implant was lost so that survival rate (SVR) was 98.15%. Then peri-implant bone resorption (success rate, SCR) was used to investigate peri-implant bone stability. No implant have a crestal bone resorption greater than 1.5 mm so that the implants studied are reliable devices for oral rehabilitation with a very high SCR and SVR.

Osteogenesis: how can it be stimulated?

Biophysical therapy can be performed using inductive, capacitive, mechanic or implanted devices. The mechanism of action of physical stimuli is at a membrane level where the activation of calcium channels determines the enhancement of cell proliferation and the production of growth factors. Biophysical therapy should be performed using devices and modalities described in the literature. The biophysical stimulation of osteogenesis is effective in the enhancement of the biology of fracture healing in presence of a correct orthopedic treatment in terms of good alignment and stabilization at the fracture site. The choice of which method must be used depends on the segment of bone that has to be treated, the type of fracture and if it is possible to apply the device on the skin. The presence of internal or external fixation devices is not a contraindication.

Implant surface activates fibroblasts: an in vitro study.

Titanium (Ti) is that the most generally used material for dental, orthopedic and maxillofacial purposes thanks to its excellent biocompatibility and mechanical properties. Several data suggest that prosthesis anchorage to bone and soft tissue are often modulated by surface characteristics. Fibroblasts are the soft tissues cells concerned in producing extracellular matrix and collagen and their tight connection to implant neck is of paramount importance in preventing peri-implant infection. The aim of this work is to grow Human Fibroblast (HFb) for seven days in wells containing (or not) dental implants. The expression levels of some adhesion and traction-resistance related genes (COL11A1, COL2A1, COL9A1, DSP, ELN, HAS1, and TFRC) were analyzed using Polymerase Chain Reaction. Our results demonstrated that several genes encoding for extracellular matrix proteins are activated so giving more insight to the comprehension of the mechanism of cell to surface adhesion.