PubMed Health⌕ Search

Biomedical subjects

A Joss

Publications and source records attributed to A Joss.

At least 37 records · Page 2Linked to original sources
PubMed1991

Short-term effects of initial periodontal therapy (hygienic phase).

The aim of the present study was to evaluate the effect of non-surgical periodontal therapy on probing pocket depths and probing attachment levels using a patient group with moderate to advanced periodontitis. 68 patients with moderate to advanced periodontitis underwent hygienic phase therapy including oral hygiene instructions, scaling and root planing and elimination of plaque retentive factors. Assessments of the plaque control record (PCR), bleeding on probing (BoP), probing depths and probing attachment levels were performed at baseline examination and 3 to 5 months following active treatment. The measurements were obtained at 4 interproximal aspects of each tooth with a thin calibrated probe. Mean BoP values decreased from 63.2 +/- 21.9% at baseline to 16.6 +/- 7.3% after therapy, and mean PCR decreased from 78.6 +/- 16.4% to 12.7 +/- 7.1%, respectively. A reduction in mean probing pocket depth from 3.96 +/- 1.39 mm at baseline to 3.30 +/- 1.16 mm after therapy was noted. Sites with initial probing depths of 1-3 mm showed no change, sites with initial values of 4-6 mm revealed a reduction of 1.03 +/- 1.04 mm, while initial pockets of 7-9 mm decreased in depth by 2.28 +/- 1.62 mm. A gain in the mean probing attachment level from 4.16 +/- 1.80 mm to 3.74 +/- 1.71 mm was observed as a result of treatment. The group with the shallow initial probing depths of 1-3 mm showed no alteration in probing attachment level. Pockets with baseline values of 4-6 mm showed gain of clinical attachment of 0.69 +/- 1.43 mm. The greatest gain in clinical attachment of 1.51 +/- 1.75 mm was obtained in sites with initially deep pockets of 7-9 mm. From the results of this study, it can be concluded that non-surgical periodontal therapy is an effective means to reduce probing pocket depths and to improved clinical attachment levels in patients with moderate to advanced periodontitis.

Adult↗
PubMed1991

Bleeding on probing as it relates to probing pressure and gingival health.

The present study was designed to determine the threshold pressure value to be applied in provoking bleeding on probing (BOP) in clinically healthy gingival units. 12 female dental hygiene students volunteered for the study. They were selected on the basis of excellent oral hygiene standards, absence of probing depths greater than 3 mm and absence of caries or dental restorations on smooth and proximal tooth surfaces. Applying a probing force of 0.25, 0.5, 0.75 and 1.0 N in one of the 4 jaw quadrants, respectively, on 2 different occasions with an interval of 10 days, bleeding on probing was assessed. Oral hygiene and gingival conditions were determined using the criteria of the plaque control record and the gingival index. On the basis of the BOP values, obtained using the lowest probing force (0.25 N), the subjects were divided into 2 groups: group 1 ("minimal BOP" value) consisted of 6 subjects yielding practically no bleeding (mean BOP = 0.9%) at both examinations, while the subjects of group 2 ("low BOP" value) had slightly higher BOP% (mean BOP = 13.4%). Both groups showed significant increase in mean BOP% with increasing probing force (0.9%-36.1% in group 1 and 13.4%-47.0% in group 2). Regression analysis revealed an almost linear correlation and a high correlation coefficient between BOP% and probing force. The comparison of the regression lines of the 2 groups showed almost identical slope inclination. However, slight differences in slope inclination were found for different sites: approximal sites clearly yielded steeper regression lines than buccal/oral sites.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1990

Absence of bleeding on probing. An indicator of periodontal stability.

Following active periodontal therapy, 41 patients were incorporated in a maintenance program for 2 1/2 years with recall intervals varying between 2-6 months. At the beginning of each maintenance visit, the periodontal tissues were evaluated using "bleeding on probing" (BOP). Reinstrumentation was only performed at sites which bled on probing. However, supragingival plaque and calculus was always removed. Pocket probing depths and probing attachment levels were recorded after active treatment and at the conclusion of the study. Progression of periodontal disease was defined by an observed loss of probing attachment of greater than or equal to 2 mm. The reliability of the BOP test as a predictor was evaluated by calculating sensitivity, specificity, accuracy, and positive and negative predictive values. While only a 29% sensitivity was calculated for frequent bleeding, the specificity was 88%. The fact that the positive predictive value for disease progression was only 6% and the negative predictive value was 98% renders continuous absence of BOP a reliable predictor for the maintenance of periodontal health.

Adult↗
PubMed1989

Effects of technical parameters on image perception using two types of dental radiographs.

In radiology a sufficient diagnostic accuracy must be obtained with a minimal radiation dosage to which the patients are exposed. In-vitro studies designed to evaluate the influence of technical parameters on the quality of images on Kodak Ektaspeed and Kodak Ultra-Speed dental radiographs are presented. The following series of experiments were performed: 1. Evaluation of the Minray dc, Soredex and Oralix 65, Philips X-ray machines. 2. Comparison between two different Oralix 65 machines. 3. Evaluation of automatic and manual film processing as well as film-focus distances of 30 cm and 39 cm. 4. Evaluation of pairs of radiographs and their subtraction images obtained from different film and X-ray machine combinations. A dried mandible with and without bone splits within the central X-ray beam area on the alveolar crest between the teeth 46 and 47 served as object for the standardized images. A blind comparison of the series of images was performed by 3 certified periodontists. Irrespective of the film type used the highest rankings were given to the Oralix 65 X-ray machine, when the films were exposed at 39 cm from the focus and the automatic processing mode was used. X-ray images with good anatomical and technical details may be obtained on Ektaspeed and Ultra-Speed films. However, preference must be given to Ektaspeed films because of the possibility of reducing the radiation exposure.

Evaluation Studies as Topic↗
PubMed1986

Bleeding on probing. A predictor for the progression of periodontal disease?

Bleeding on probing (BOP) is a widely used criterion to diagnose gingival inflammation. The purpose of the present retrospective study was to evaluate its prognostic value in identifying sites at risk for periodontal breakdown during the maintenance phase of periodontal therapy. 55 patients who had been treated for advanced periodontitis participated in a recall system for at least 4 years, at regular intervals of 3-5 months. At the start of every appointment, BOP to the bottom of the pocket was registered at 4 sites of every tooth. A random selection of 1054 pockets was made and subdivided into 5 categories according to the incidence of BOP during the last 4 recall appointments. All pockets with a BOP incidence of 4/4 and 3/4 were selected, while only interproximal sites with a BOP incidence of 2/4, 1/4 and 0/4 were chosen. Subsequently, these categories were grouped according to whether or not the attachment level had been maintained from the time prior to the last 4 recall visits. Greater than or equal to 2 mm was defined as loss of clinical attachment. The results indicated that pockets with a probing depth of greater than or equal to 5 mm had a significantly higher incidence of BOP. Patients with 16% or more BOP sites had a higher chance of loosing attachment. Pockets with an incidence of BOP of 4/4 had a 30% chance of loosing attachment. This chance decreased to 14% with BOP of 3/4, 6% with BOP of 2/4, 3% with BOP of 1/4 and 1.5% with BOP of 0/4.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1979

A method for analysis of human mandibular occlusal movement.

A new method was developed to produce perspectives and maps of the top of Posselt's envelope of motion, the part that is mainly determined by occlusal tooth contact. Mandibular occlusal gliding movements were recorded in human subjects by optoelectronic tracking of infrared light emitters fixed to the subjects upper and lower teeth. Recordings were made by a commercially available electronic camera system that was extended to meet the special needs. An elaborate computer program was developed to process the information and convert it into graphic plots. Care was taken to make the system easy to use.

Computers↗