MASTOID GOUGES AND CHISELS

Unilateral mastoid hypertrophy.

A 34-year-old man lacerated his forehead and was brought to the emergency room. Skull films (fig s. 1 A and 1 B) showed small and large rad iolucent , air-containing ce lls extending from the upper posterior reg ion of the mastoid area on the left side, across th e temporal-occipital suture into th e squamous portion of the occipital bone, and into the posterior part of the parietal bone. The s...

Endoscopic Middle Ear and Mastoid Surgery for Cholesteatoma

Introduction: To reduce incidence of residual cholesteatoma following ear surgery; and to reduce the need for second look “open” mastoidectomy using endoscopic mastoidotomy. Ten-year retrospective chart review of 249 primary cholesteatoma cases (1994-2004) with a minimum follow-up of two years.  The first objective was to evaluate the effectiveness of otoendoscopy in reducing the incidence of “...

Mastoid Cavity Obliteration with Combined Palva Flap and Bone pâté

Introduction: This study was designed to evaluate the usefulness of mastoid cavity obliteration with combined bone pâté and Palva flap in the prevention of problematic mastoid cavities after canal wall down mastoidectomy.   Materials and Methods: In a prospective longitudinal study with a mean follow-up of 28 months conducted between 2008–2012, a series of 56 ears in 48 patients with chronic ot...

Mastoid Suppuration without Tympanic Perforation and Suppuration

Effect of rolling on dissipation in fault gouges.

Sliding and rolling are two outstanding deformation modes in granular media. The first one induces frictional dissipation whereas the latter one involves deformation with negligible resistance. Using numerical simulations on two-dimensional shear cells, we investigate the effect of the grain rotation on the energy dissipation and the strength of granular materials under quasistatic shear deform...