In vitro investigations of abrasive strength of VITA and SHADEMATE ceramic materials during a simulated function. Do not show any clinical relevant variations of dimension and colour.
In vitro investigations of abrasive strength of VITA and SHADEMATE ceramic materials during a simulated function. Do not show any clinical relevant variations of dimension and colour.
The analysis of 120 patients with zygoma fractures showed disturbances of sensibility in the field of the N. infraorbitalis in 84% and pathological statements of eyes in 20%. The re-examinations of 76 of these patients 0.5-4.5 years postoperative showed that more than the half of these patients, who were treated by only the bone-retractor have a redislocation of the zygoma, and 49% of all cases have permanent damages of the N. infraorbitalis. The reason for the damage of the nerve is not only the compression of the nerve for a short time by the dislocated zygoma but also regular present additional splits of the orbital floor, along the Canalis infraorbitalis. This statement is demonstrated in the present work by experimental examination.
In general as dominating aetiological parafunctions are considered to be the onset of mandibular dysfunctions. In general dental consulting hours this statement was checked and confirmed in patients who were not selected. According to the Helkimo index 20.8% of the patients showed subjective symptoms and 60.2% of the patients showed objective symptoms of mandibular dysfunctions. The rate of patients with parafunctions was growing with the increasing index of dysfunction.
During a 14-day test period a 0.2% and a 0.4% zinc chloride solution have been examined concerning their antibacterial efficiency on the total streptococcus flora of dental plaque under conditions conforming to standard by means of the Mylar foil technique. The results of the microbiological examination show a significant decrease of colony developing units of the plaque streptococci by a 7-day mouth rinsing with zinc chloride solution. The lesser antimicrobial effect of the zinc chloride solution compared with a 0.2% chlorhexidine solution is not proved statistically in the test period. A 0.2% or 0.4% zinc chloride solution could complete the mechanical dental and oral hygiene in an effective way.
The use of high- and highest-speed preparation instruments and the therefore required intensive spray cooling results not only in more efficient working possibilities but also in an increased infection hazard, especially for the dentist and his assistance caused by the spray rebound. Simulated preparations were carried out on different tooth surfaces at different positions of the patient with or without exhaust under clinical conditions to objectify the space spreading of the spray rebound. The arrangement of the equipment has been objectified by photogrammetry so that the measurement data could be clearly classified. The use of the spraying mist exhaust reduces the spray rebound between 50 and 65%.
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