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Biomedical subjects

A Kurbad

Publications and source records attributed to A Kurbad.

18 recordsLinked to original sources
PubMed2005

InEOS--new system component in Cerec 3D.

A new device for digitizing model surfaces for dental CAD/CAM applications is available with the inEOS scanner. It works according to the principle of stripe light projection. Both rotational scan mode of single prepared teeth and overview scan mode in which a complete model of the jaw can be acquired are possible. Detailed scans can be token in addition to improve the data quality. The software basis is the proven Cerec inLab 3D program. The virtually produced restorations can be milled either with the inLab milling unit or transferred to the Infinident milling center for central production. A clinical case which was treated by using the inEOS scanner is presented.

Adult↗
PubMed2003

All-ceramic primary telescopic crowns with Cerec inLab.

On the one hand, all-ceramic primary telescopic dentures serve to satisfy the growing esthetic needs of older patients, and on the other hand guarantee good adhesive stability. With the aid of the Cerec inLab system, primary telescopic crowns made of Vita In-Ceram infiltration ceramic can be designed and milled after previous conventional determination of the over all insertion direction. The raw crowns gained in this way then require only minor improvement. The secondary parts are produced with the aid of electroforming. These are adhesively bonded to the tertiary structure. The special feature of adhesive bonding of the primary telescopic crowns requires uncompromisingly good cooperation between dentist and laboratory.

Aluminum Oxide↗
PubMed2003

3D software extension for Cerec inLab.

Three new software components for the Cerec inLab system, already proven in the dental laboratory area, are presented. They are all based on three-dimensional display. On the one hand, the design can be simplified, and on the other hand, the range of indications can be extended to inlays, onlays, veneers, and multiunit bridges with the aid of these new components.

Computer-Aided Design↗
PubMed2001

Cerec goes inLab--the metamorphosis of the system.

In spite of its underlying conception as being a chairside procedure, the Cerec procedure is now establishing itself in the dental laboratory as well. Based on hard core infiltration ceramic technology, it allows the production of crown caps and bridge frames held with a single attachment. The scan machine of the existing Cerec product family forms the technical basis of the new Cerec inLab instrument. Numerous modifications have been carried out. In addition, not only the magnification of the implementable work piece size, but also the changes in the scan process have been modified, which allows a higher resolution and the introduction of a new, very delicate milling bur. The software has been designed to be very user-friendly; the design of caps and frames has been greatly simplified. Without basic changes to the clinical process used for metal-ceramic, the smooth transition to full-ceramic restorations is possible for the dentist. The distinct separation of Cerec units for the dentist and Cerec inLab as a laboratory machine makes sense simply because of the high proportion of dental-technical steps. The new instrument can be seen as a further step toward the integration of CAD/CAM technology in the field of dentistry, of equal benefit to dentists, dental technicians, and patients.

Ceramics↗
PubMed2000

The integration of Cerec Scan into the treatment process.

An efficient CAD/CAM machine for single-tooth restorations and possibly small bridges is available with Cerec Scan. Despite the higher workload needed for scanning and indirect work, restorations can be produced in one appointment by using fast-curing impression and modelling materials.

Ceramics↗
PubMed2000

The optical conditioning of Cerec preparations with scan spray.

Coating the surfaces with an anti-reflection substance before taking the optical impression is indispensable for exposures with the Cerec camera. Up to now, this has been done mainly by powdering with titanium dioxide. Errors which have a negative influence on the result can, of course, arise during the coating process. Although powdering is a proven method which has led to outstanding results in many thousands of restorations, it represents a weak spot in the clinical procedure. In the present study, the handling and data quality of an innovative spray for applying an anti-reflection coat to restoration surfaces were examined. The values obtained were chiefly displayed in the Section window of the Cerec 3 software. Despite a few small problems, handling can be considered good and safe. The primary advantage consists in the display of the preparation boundaries, since the coated surface can be dried with an air stream. With regard to detail reproduction, data quality, and coat thickness, the quality of the optical impression has reached a new level. The present study shows that considerable errors can arise in the restoration from powdering, due partly to material buildup. The Scan Spray tested can be recommended for clinical use.

Aerosols↗
PubMed1993

Evaluation of anti-calculus efficacy. An SEM method of evaluating the effectiveness of pyrophosphate dentifrice on calculus formation.

A double-blind, cross-over study was carried out to assess the anti-calculus effectiveness of a pyrophosphate containing cleaning gel. 2 groups of 30 heavy calculus formers were followed up comparing conventional clinical scoring systems (Volpe-Manhold-Index and Marginal-Line-Calculus-Index) and micromorphologic SEM criteria of calculus formation and inhibition. The results indicated that after a 3-month period, there was a significant reduction of calculus formation compared to a placebo gel. The proposed SEM calculus index (SEMCI) objectively reflects the reduction of supragingival calculus formation.

Adult↗
PubMed1991

[Inhibiting effect of a pyrophosphate-dentifrice on calculus formation].

Anticalculus dentifrices containing pyrophosphate salts have been shown to reduce calculus formation. The purpose of this double-blind, cross-over study was to compare the effects of a pyrophosphate dentifrice with a placebo on supragingival calculus formation in highly calculus-prone subjects. 60 volunteers completed a compliance period during which meticulous full-mouth scaling was performed. Subjects were randomly assigned either to placebo (F-Antibelag Gel) or to the test group (F-Antibelag Gel + K4P2O7/Na4P2O7). Participants were told to brush twice daily with their assigned dentifrice, use only the brushes provided and to abstain from any other oral hygiene procedures. After a three month period a second full-mouth scaling was performed, and according to the cross-over design of this study the participants used the alternative placebo or, respectively, dentifrice for another three months. Baseline scores and control scores after 1, 2 and 3 months were obtained using the Volpe-Manhold-Index and the Marginal-Line-Calculus-Index. A micromorphological SEM Calculus Index was introduced using replicas from interdental areas of mandibular incisors (score 0-3). Both test groups showed significantly less accumulation of supragingival calculus of 25.5% (VMI) and 19.5% (MLCI) and significantly less SEM detectable calculus (24%) with the pyrophosphate dentifrice than with the placebo. It is concluded that the test dentifrice inhibits the formation of calculus.

Adult↗
PubMed1990

[Epidemiological profile of dental caries and treatment needs].

In a population survey 2,263 patients were examined for their caries status and treatment needs. The DMF/T-Index and the individual relative risk for caries were calculated. Adolescents and young adults showed a high caries risk and required most of all necessary restorations. But especially older adults and seniors over 55 years presented a high caries risk, required more extensive restorations and more public dental health care at all.

Adolescent↗
PubMed1990

[Evaluation of the efficacy of sanguinarine using the experimental gingivitis model].

Some studies showed positive results in testing the efficacy of sanguinarine delivered as oral rinse or dentifrice against plaque and gingivitis. The application of a gel containing 0.05 and 0.5% sanguinarine using special trays did not prevent plaque formation in regions with no oral hygiene. In contrast to placebo the 0.5% sanguinaria-gel was able to retard the formation of an experimental gingivitis. Chlorhexidine was superior to sanguinarine. Side effects were not detected.

Adult↗
PubMed1990

[Relation between functional-immunological and clinical parameters in juvenile periodontal diseases].

In 57 Moscow adolescents aged 15 to 19 years gingival bleeding and periodontal pocketing was recorded. In addition to this functional parameters of Rheoperiodontography and Polarography were documented and immunological investigations were carried out. The clinical parameters of the test group showed a higher level of periodontal diseases compared with a random selected control group. A correlation between clinical and functional parameters in early periodontal destruction was not detected. This study demonstrates the importance of prevention of periodontal diseases in adolescents.

Adolescent↗
PubMed1988

Assessment of periodontal disease and dental caries in a population survey using the CPITN, GPM/T and DMF/T indices.

2263 randomly selected subjects, aged 15-19, 20-24, 25-29, 30-34, 35-44, 45-54, 55-64, and greater than 64 yr, were assessed for periodontal status, caries status and treatment needs using the Community Periodontal Index of Treatment Needs (CPITN), the ratio of Gingivitis: Periodontitis: Missing teeth (GPM/T index) and the DMF/T index. The advantages of full mouth examination were compared to partial recordings. The CPITN underestimated deep pocketing especially in older age groups and in younger groups overestimated the need for scaling. Although the mean GPM/T number of periodontally affected teeth is in the range of 9-13 teeth and stable throughout the age groups there were age-dependent high risk groups for developing shallow pocketing (20-24 yr) and deep pocketing (45-54 yr), whereas adolescents were at high caries risk. The increase in the number of missing teeth was dramatic after the age of 54 yr only one decade after the high risk age for deep pathologic pockets.

Adolescent↗
PubMedDate not supplied

Clinical aspects of all-ceramic CAD/CAM restorations.

All-ceramic restorations were restricted in the past to a relatively small group of users. Among other things, this is explained by the high clinical expense for such work. The latter can be reduced decisively by using high-strength hard core ceramics and CAD/CAM production. The preparation corresponds largely to the preparation in metal-ceramic work. There are also scarcely any differences in elastic impression taking. Thanks to the high strength of modern all-ceramic systems, they can be inserted conventionally; using adhesive systems is naturally also possible and recommended.

Cementation↗
PubMedDate not supplied

[An assessment of the variations in periodontal pathology in adolescents].

Forty-seven adolescents with periodontal abnormalities were examined using clinical, immunologic, and functional tests (altogether 12 signs). Factor analysis helped cut down the number of signs just to 4 major factors. Interpretation of these factors and consideration of the individuals in factor space permitted singling out at least 2 types of periodontitis course, requiring, possibly, different approaches to therapy.

Adolescent↗