Search PubMed⌕ Search

Biomedical subjects

K H Rateitschak

Publications and source records attributed to K H Rateitschak.

At least 19 recordsLinked to original sources
PubMed1992

Non-surgical periodontal treatment: where are the limits? An SEM study.

In the present scanning electron microscopic study, the possibilities and limitations of non-surgical root planing were investigated. 10 single-rooted teeth from 4 patients with advanced periodontitis were studied. The root surfaces were cleaned and planed without flap reflection, using fine curettes. The teeth were then extracted and the root surfaces were systematically examined by scanning electron microscopy (SEM) for the presence of residual bacteria and calculus. 29 of 40 curetted root surfaces were free of residues, if they were reached by the curette. On the remaining 11 surfaces, only small amounts of plaque and minute islands of calculus were detected, primarily at the line angles and also in grooves and depressions in the root surfaces. Instrumentation to the base of the pocket was not achieved completely on 75% of the treated root surfaces, however. The primary reason for this was the extremely tortous pocket morphology on the teeth selected for study. In conclusion, it may be stated that during non-surgical root planing in cases of advanced periodontitis, surfaces that can be reached by curettes are usually free of plaque and calculus. However, in many cases the base of the pocket will not be reached. It is for this reason that deep periodontal pockets should be treated with direct vision, i.e., after the reflection of conservative flaps.

Adult↗
PubMed1991

An in vitro investigation on the loss of root substance in scaling with various instruments.

There are differing opinions as to the extent to which root cementum has to be removed during root surface instrumentation over and above that of the debridement of plaque and calculus. Similarly, the amount of tooth material removed by individual instruments is also unclear, but a trend towards less damaging methods of root surface debridement has evolved in recent years. The purpose of this in vitro study was to determine the amounts of root substance removed by 4 different methods of instrumentation, hand curette, ultrasonic scaler, airscaler and fine grit diamond bur. Measurement of tooth substance loss was carried out with a specially constructed measuring device at 360 sites on 90 mandibular incisors following 12 working strokes with a clinically appropriate force of application. Only a thin layer of root substance (11.6 microns) was removed by the ultrasonic scaler, compared to the much greater losses sustained with the airscaler (93.5 microns), the curette (108.9 microns) and the diamond bur (118.7 microns).

Dental Cementum↗
PubMed1991

[The Perioplaner/Periopolisher. The loss of substance on the root surface and the initial clinical experiences].

A new system for the removal of supragingival and subgingival plaque and calculus was studied. The system involves two motor driven handpieces. One handpiece works with curettes and hoes (Perioplaner) and the other works with diamond-layered instruments (Periopolisher). In the first part of this study the loss of root substance was measured as a consequence of treatment by these motor-driven instruments. These results were compared with those using classical hand curettes and rotating diamonds (Perio-Set). In the literature there is still debate over whether it is necessary to remove not only plaque and calculus but also cementum which may contain endotoxin or may even be infected. Whatever opinion one may have, it must be known how much root substance is lost by using a particular scaling instrument. This study has shown that the use of the Perioplaner and Periopolisher results in about the same loss of root substance as the use of hand instruments. In the second part of this study, first clinical experiences with these instruments are reported.

Dental Calculus↗
PubMed1991

[Periodontal treatment failure].

Therapeutic failure appears to be more frequent in periodontology than in other fields of dentistry. Such failure may be caused by errors in patient selection, incomplete diagnostic procedures, diagnostic or prognostic errors, treatment difficulties and obstacles, non-controlled healing, or the absence of maintenance therapy. Most failures can be avoided by instituting a regular recall system.

Appointments and Schedules↗
PubMed1990

[The border seal in restorations of class-V lesions with glass ionomer cement and composite (the sandwich filling)].

In 9 patients, 60 class V restorations were evaluated clinically and by scanning electron microscopy. All lesions were treated with glass-ionomer combined with composite resin. In 27 fillings (group A) the glass-ionomer lining cement was etched, whereas in 33 fillings (group B) the composite material was applied directly on the unetched glass-ionomer liner. Clinically, the retention of the fillings after one year was 100%. The margins of the fillings were checked with different explorers and found to be acceptable. Scanning electron microscopy of the margins of the fillings showed disappointing results. One week after placement of the fillings, only 16.2% (group A) and 7.4% (group B) of the cervical margins in dentin were rated perfect. After one year, even more cervical bond failures were observed. 9.7% perfect margins were found in group A, 3.2% in group B. Etching of the glass-ionomer liner had no influence on the cervical bond failure of the class V fillings.

Acid Etching, Dental↗
PubMed1989

The effectiveness of root debridement in open flap procedures by means of a comparison between hand instruments and diamond burs. A SEM study.

The goal of the present in vivo study was to evaluate human roots by means of scanning electron microscopy (SEM), after treating the root surfaces either with conventional hand instruments or with newly developed diamond burs. Peculiar root anatomy often makes perfect instrumentation with hand instruments difficult or impossible. On 20 teeth destined for extraction because of severe periodontitis, the root surfaces were exposed by mucoperiosteal flap procedures. Ten roots were then planed using fine curettes, and 10 were instrumented using diamond burs. Following extraction, the root surfaces were stained and photographed. Stained areas were examined by SEM. On the 20 test teeth, 79 surfaces were evaluated. From these, 381 stained zones were checked by SEM for the presence of bacteria. A total of 216 stained areas from teeth treated by hand instruments was evaluated; 15 of these (6.9%) contained bacteria. Of roots treated by diamond burs, 165 stained areas were evaluated; 9 (5.5%) exhibited bacteria. Thus, both methods resulted in root surfaces that were essentially bacteria-free.

Adult↗