Deutsche Stomatologie (Berlin, Germany : 1990)最新文献

The effects of a very short pulsed infrared mini-TEA-CO2-laserbeam at the wavelength of 10.6 microns on dentine were studied. The results of the light- and scanning electron microscopic investigation indicated the possibility of a precise removal of hard tooth structure without causing thermal damage of the tissue. Removing material by photoablation leads to a retentive surface on dentine and to a partially closure of the dentinetubuli at the bottom of the treated cavity. Undesirable thermal effects like surface-cracking and carbonisation were not observed.

The aim of the study was to evaluate the biocompatibility of the in-cream-ceramic-system in several technological phases by animal experiments. The comparative materials were the Co-Cr-alloys Remanium CD and Wirobond and the implant materials Titanium, Tantalum and Columbium and the high biocompatible material Teflon. The experiments were carried out in accordance with the DIN-standard 13,930 using subcutaneous implantation to verify the toxicity of the materials. 20 cylindrical test pieces were implanted into the subcutaneous connective tissue of the neck in rats. After 12 weeks the animals were sacrificed and the implants were removed with the surrounding tissues. The thickness of the fibrous capsule and the number of cells within the capsule were measured microscopically. The in-ceram-ceramic-system showed the same results like approved Co-Cr-alloys. The results of the implant materials were not attained.

It is reported the kind of prevalence of localized periodontal recessions (lpr) in cases of 121 subjects aged from 20 up to 34 years. Most frequently the facial sites of the teeth 44, 23, 34, 13, 14, 24 and 43 are involved. We could not detected an increase of frequency of lpR with the increase of age. Right-handed persons generally show more and deeper lpr in both jaw-sites compared with left-hander. Also right-hander show a smaller plaque accumulation. This result gives us support for our recommendation for a special gentle method of tooth cleaning for subjects suffering from lpr.

A collective measures of oral hygiene have been carried out at monthly, quarterly and half-yearly intervals on 442 pupils at the 6th to 8th classes, integrated in rhythm of the school-year. These investigations demonstrate the general possibilities of collective preventive measures also in this group of age. By means of a well organized system of care progress will be obtained in the sense of oral health. However twicely instructed measures of oral hygiene for each school year are not sufficient, if started at first in the superior classes.

Incorporation of prosthodontics are expected to depend not only on technical perfection. Therefore a hypothesis was built up that incorporation occurs different in patients and depends on psychological factors. In order to prove that, seven determinants were evaluated and inquired in 80 patients, parted in three groups after having treated by Konuscrown partial dentures in an average of wearing for seven years. All events could be observed as being in an average range lesser than 8 till 10%. Whilst total nonaccustomes can be expected in the amount of 3.8%. On behalf incorporations, Konuscrowns shows results as similar as bridgework.

Because of the excellent biocompatibility titanium can be considered as an ideal material for prosthetic reconstructions. Especially for base metal alloys titanium is an alternative due to the low cost. Processing still causes problems. In this paper a vacuum pressure casting system and a combination of milling and spark erosion are described and investigated. Both techniques are suitable to manufacture prosthetic restorations with a high accuracy of fit. Problems in dental castings lie in the occurrence of a superficial reaction zone of about 40-100 microns width. No final conclusions concerning the metal-ceramic compound can be drawn at the moment for lack of undisputable results in different mechanical bonding tests. Due to the remaining difficulties the future importance of titanium in prosthetic dentistry cannot be prognosticated.

The measurements of electrochemical polarization of dental amalgams was studied in 5% sodium chloride aqueous solutions, in an artificial saliva and in natural saliva with different pH-values. The non-gamma-2-amalgams have been reported to have higher corrosion resistance in comparison to gamma-2-phase containing amalgams. The results show that the electrochemical corrosion behaviour is strongly differentiated using natural saliva.

In pain patients with functional disorder you can often find a disharmonie in the cervical spine. The results of the examination from 74 patients (47 female, 27 male) shows that: 1. 86.5% of the patients told about neck pain. Those patients with hard neck pain, you can find five or more dolent masticatory muscles. 2. 50% of the patients have on block in the cervical spine, 36.5% have between two and four blocks. 3. In patients with low neck pain you can find less blocks, than in patients with hard neck pain. If there is a block the part of the patients with more than five dolent muscles is significantly higher. 4. 64 patients who have a block shows at the same time 56.8% a functional disorder. So everybody can see that it is really necessary to work together in the diagnosis, therapy and treatment in patients with functional disorders.

In 32 patients with plaque associated gingivitis the effect of initial treatment for 2 respectively 4 weeks on the gingival index (GI) and the interleukin 1 (IL 1) content in the gingival sulcus fluid (SSF) was investigated. After successful clinical treatment a decrease of the IL 1 level was found. The importance of the IL 1 content of the gingival sulcus fluid as a sensitive parameter for therapy control is discussed.

In 1989 the Leipzig-ICS-I study from 1979 was replated according to the same methodology on randomized probands (N = 2693). A significant reduction of the dmft-value (27%) and DMF-value (50 resp. 27%) with clear increased f(F)-value was found at 8/9 and 13/14, years olds. At the same time there was a caries increment of 1.9 DMFT from 1979 to 16 DMFT in 1989 in the age group of 35-44 years. Again in this group was found a very low edentulousness (0.3%) and a very high number of natural teeth (25.9). During 10 years the prevalence of dentofacial anomalies decreased about 25.6% (13 to 14 years old) and in the adult group the prostetic treatment needs decreased by half. The results reveal an essential improved oral health status in consequence of intensive dental care. Unsatisfied is the periodontal status. 90% of subjects need oral hygiene measures.