Search PubMed⌕ Search

Biomedical subjects

H C Plagmann

Publications and source records attributed to H C Plagmann.

At least 37 records · Page 2Linked to original sources
PubMed1996

Heat propagation in dentin during instrumentation with different sonic scaler tips.

It is important to know how much heat is generated when a root surface is debrided with sonic scalers and if that heat can be released satisfactorily into the environment. The temperature changes that occurred in dentinal specimens treated with two different sonic scaler tips, used with and without coolant, were studied. Temperature increases of up to 4 degrees C were observed for both tips when a coolant was used. Heat propagation during instrumentation was dependent to a considerable degree on the temperature of the coolant. Sonic scalers should not be used without coolant, because the dentinal temperature may increase up to 35 degrees C, depending on the force of application. A high positive linear correlation was found between increase in temperature and force of application.

Dental High-Speed Equipment↗
PubMed1994

Treatment of subgingival implant surfaces with Teflon-coated sonic and ultrasonic scaler tips and various implant curettes. An in vitro study.

Removal of plaque and calculus by means of sonic and ultrasonic scalers causes considerable damage to implants. With a view to avoiding the aggressive effects of these instruments, an experimental study was carried out for which conventional sonic and ultrasonic scalers were coated with Teflon. The effects of these instruments on implant surfaces was then compared with that of plastic and metal implant curettes. Stereo-microscopy, scanning electron microscopy and surface profilometry were used to detect and record damage to implant surfaces and changes in surface roughness. Generation and propagation of heat in subgingival simulation of use of sonic and ultrasonic scalers were also recorded by means of temperature measurements at the implant surface. The results revealed that no discernible damage was caused by Teflon-coated sonic and ultrasonic scalers or implant curettes made of plastic on smooth titanium surfaces. Instrument material residues were found on rough implant surfaces. It was not the intention of this study to provide an analysis of the prerequisites for the cleaning of rough implant surfaces, but rather to determine what type of damage is to be expected when contact is made with smooth and rough surfaces unintentionally. Temperature measurements during the subgingival use of sonic and ultrasonic scalers indicated satisfactory functioning of the cooling system. Coating of sonic and ultrasonic scaler tips with Teflon thus facilitates the use of high-frequency instruments to achieve professional cleaning of implants.

Dental Implants↗
PubMed1994

Periodontal manifestation of hypophosphatasia. A family case report.

Hypophosphatasia is a rare inherited disease, the 1st clinical sign of which is often a premature loss of deciduous teeth. We describe clinical, histological and SEM findings of 2 cases of hypophosphatasia from a single family and discuss the pathological mechanisms with reference to the literature.

Alkaline Phosphatase↗
PubMed1991

[Long-term study on the effects of the width of keratinized gingiva on the localization of the gingival margin].

In a 5-year longitudinal study we assessed the amount and frequency of gingival recessions in relation to the width of the keratinized gingiva and the already existing recessions in two groups (each n = 15). Group I (dental students) had nearly no recessions and group II (patients) had exposed roots on 24% of their teeth. In both groups there existed no correlation between the width of the keratinized gingiva or, respectively the existing recessions and the recessions occurring. Only 36 sites had a recession greater than or equal to 1 mm, these were accumulated in just a few probands.

Adult↗
PubMed1991

[Guided tissue regeneration for the treatment of different periodontal defects. A clinical study].

In 31 patients we implanted a teflon membrane (Gore-Tex) during flap operation for a duration of 6 weeks. The periodontal situation was assessed clinically and radiographically 1-1.5 years after surgery. The study comprised 18 upper and lower molars with furcation involvement and 15 single-rooted teeth with a 2-wall-, 3-wall- or combined bony defect. Clinical gain of attachment only occurred in furcation class II lesions (upper molars + 2.3 mm, lower molars + 2.5 mm), whereas the attachment level was unchanged in "through and through" furcation defects in the upper jaw and loss of attachment was observed at lower molars with class III furcations. In single-rooted teeth the gain of attachment varied between 0.5 and 8.5 mm, depending on the proportions of the defect and the number of the surrounding bony walls.

Adult↗
PubMed1990

[Interproximal tooth cleansing of abutment teeth and pontic design].

This clinical study was an attempt to find out if a patient's home care plaque control at his or her abutment tooth is more effectively enhanced by a modified ridge lap or a hygienic pontic design. Oral hygiene was performed either with a tooth brush alone or in combination with an interdental brush. We found that the effectivity of interproximal toothcleaning was not influenced by the pontic design and that only interdental brushes permit a good plaque control at the proximal area of the abutment tooth. This implies that "self cleansing" is non-existent in these tooth areas.

Dental Abutments↗
PubMed1990

[Periodontal treatment of furcally involved teeth: with or without root resection?].

A retrospective radiographical and clinical evaluation of 275 molars (59 patients) with different classes of furcation involvement was assessed. Flap operations with and without root resections had been performed and the patients were enrolled in a regular maintenance program for at least 4 years (up to 8 years). The life expectancy of molars with root resection was compared to molars conventionally treated by flap operation. Probing depth was reduced significantly on molars of the lower jaw even with class III involvement, progression of periodontal disease could be arrested. The progression of bone loss (mean 1.4 mm) in molars of the upper jaw with a class III involvement could be stopped only by root resection. During the observation period 12 teeth had to be extracted. 8 for nonperiodontal reasons. The long-term prognosis of class III furcations only treated by flap operation with or without tunnel preparations was as good as that of root resected molars.

Adult↗
PubMed1990

[Assessment of the acceptance of modern periodontal treatment].

In a retrospective study we assessed the acceptance of necessary modern periodontal treatment by more than 2200 patients in the years 1981-1987. 50% of the patients withdrew from treatment in the presurgical phase and 42% in the postsurgical maintenance phase; particularly during the first year the drop out rate was high (64%). One of the reasons could be a certain lack of health awareness and fading willingness of the patients for permanent cooperation as known from longstanding chronic diseases in general medicine. Therefore it remains necessary to enhance periodontal health awareness and to promote information on the cause and treatment of periodontitis and the subsequent maintenance care.

Health Education, Dental↗
PubMed1989

[Psychological aspects on the treatment with periodontal surgery].

In a pilot study on psychological aspects of periodontal treatment more than 90% of 95 patients gave a positive rating of our approach of periodontal surgery by quadrants in cases of profound periodontitis. On the basis of their own experience with this course of surgery more than 90% of patients would recommend periodontal treatment to others. The results of our questionnaire survey confirm that their is no reason for doing periodontal surgery at one appointment. About half of the patient showed a reduction of their anxiety level in the course of surgical periodontal treatment. With increasing interval (1 year) a minor part of the patients partly modified their opinion on some of the questions asked.

Periodontitis↗
PubMed1989

[Plaque--gingivitis--periodontitis. (2) Microbiology and pathogenesis of periodontitis].

In a survey, current conceptions regarding the origin of gingivitis and periodontitis, as well as their clinical picture, are described. After the build-up of the bacterial plaque in several phases to form a periodontal pathogenic plaque, following a short, acute stage, a chronic gingivitis soon establishes itself in the neighbouring soft gingival tissue, from which, not inevitably, however, a periodontitis can develop after some years, the osseous parts now also being involved in the periodontal destruction, in which the polymorphonuclear neutrophilic granulocytes appear to have a major share. Depending on the age of the patient, progress of the disease, and the composition of the subgingival plaque, endeavours are made to classify the periodontal diseases into four subgroups. In recent years, however, doubt has increased as to whether gingivitis and even the periodontitides can be considered as comprising a single disease. However, this does not affect therapeutic concepts developed on the basis of opinions to date and which, as a rule, are successful, so that, for the time being, there is no reason for a change in this sphere.

Dental Plaque↗
PubMed1989

[Changes in the enamel surface after calculus removal].

A clinical trial examined the effect of calculus removal on the enamel surface using a Gracey curette 5/6, an ultrasound unit, and three air scalers with five different tips, in terms of the rate of surface lesions and the extent and depth of the defects. A total of 140 teeth were copied to assess and measure the surface lesions. The hand-held instrument did not damage the tooth surface. For calculus removal with automatic instruments surface lesions were observed to be a function of the type of equipment and the tip configuration used, with sharp-edged instruments causing the more severe destruction. Therefore automatic calculus removal instruments should not be used for routine tooth cleaning. They should be reserved for first-time removal of old, hard, and very tough calculus.

Adult↗