AIM The purpose of this paper was to describe the dental and surgical management of the impaction of deciduous maxillary anterior teeth due to compound odontoma. In all analysed patients impaction of the maxillary deciduous canine was associated with the presence of an odontoma. Therefore, impaction of the maxillary deciduous canine can be considered as pathognomonic of the presence of an in...

Vertical transport of many atmospheric trace gases is modulated by retention in solid (ice phase) precipitation during the impaction and freezing (i.e., timing) of supercooled cloud droplets. Here we report field measurements of the concentrations of both hydrogen peroxide (H202) and molecular oxygen (02) in time ice. Gas retention efficiencies, defined as the ratio of the observed concentratio...

Tooth impaction is a pathological situation where a tooth fails to attain its normal functional position. Impacted third molars are commonly encountered in routine dental practice. The impaction rate is higher for third molars when compared with other teeth. The mandibular third molar impaction is said to be due to the inadequate space between the distal of the second mandibular molar and the a...

AIM The aim of this study was to assess the relative contributions of patient characteristics and radiographic variables to the difficulty of extraction of impacted mandibular third molars in a Nigerian population. METHODS AND MATERIALS Seventy-nine consecutive patients undergoing mandibular third molar extractions were recruited for this prospective cohort study. Specific patient characteris...

We developed a method of applying vibration to the impaction bone grafting process and assessed its effect on the mechanical properties of the impacted graft. Washed morsellised bovine femoral heads were impacted into shear test rings. A range of frequencies of vibration was tested, as measured using an accelerometer housed in a vibration chamber. Each shear test was repeated at four different ...

Objective To investigate the responses of refrigerated osteochondral allograft cartilage (OCA) and fresh cartilage (FC), including cell survival and metabolism, to surgical impaction and proinflammatory cytokines. Design Osteochondral plugs (8 mm diameter) were harvested from prolonged-refrigerated (14-28 days) and fresh (≤24 hours postmortem) human femoral hemicondyles and subjected to a 0.2 N...

BACKGROUND AND PURPOSE Porous titanium (Ti) particles can be impacted like cancellous allograft bone particles, and may therefore be used as bone substitute in impaction grafting. We evaluated the effect of impaction and of a thin silicated biphasic calcium phosphate coating on osteoconduction by Ti particles. METHODS The bone conduction chamber of Aspenberg was used in goats and filled with ...

BACKGROUND There are no existing studies that provide data regarding the epidemiology of, and risk factors for, fecal impaction, either in the general population or in any sub-group of people. OBJECTIVE Estimate the prevalence of and factors associated with fecal impaction on a representative sample of the institutionalized elderly population. DESIGN Two-phase study. Phase 1: pilot study va...

Microbial stress due to the impaction of microorganisms onto an agar collection surface was studied experimentally. The relative recovery rates of aerosolized Pseudomonas fluorescens and Micrococcus luteus were determined as a function of the impaction velocity by using a moving agar slide impactor operating over a flow rate range from 3.8 to 40 liters/min yielding impaction velocities from 24 ...