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PubMed2003

Advanced crown and bridge design.

The present article describes the CAD construction procedure of copings, reduced crowns, anatomical crowns, hybrid bridges, and other construction software features contained in the Digident dental CAD/CAM system (Girrbach Dental, Pforzheim, Germany). The individual design of a crown or a bridge framework will, of course, influence the stability and the longevity of the final dental restoration. Especially an anatomically reduced crown framework possesses--in comparison to a simple coping design--several advantages, while for some materials, a full crown design is esthetically not suitable. An anatomically reduced crown design results in a mechanical support of the occlusal cusps, as the high strength framework is mechanically more favorable than the veneering ceramics or composites. Moreover, the reduced construction of the anatomical shape allows the creation of ceramic layers of approximately homogeneous thickness. This has the effect that the residual stresses in the veneering ceramic after the thermal treatment, i.e., several firing and cooling cycles, are minimized. A prerequisite for the computer-aided anatomical construction of crowns is the inclusion of adjacent teeth and the articulation of the opposing jaw. In these terms, the opposing jaw or a bite impression have to be scanned, digitized, and positioned virtually in bite relation. While taking patient-specific articulator parameters into account, a software-integrated "virtual articulator" allows simulation of dynamic occlusion and therefore a computer-aided reduction of interfering contact points.

Computer-Aided Design↗
PubMed2004

The relationship between clinical dental status and oral impacts in an elderly population.

PURPOSE: To investigate the relationship between oral health-related quality of life and clinical dental measures in an elderly Greek population. MATERIALS AND METHODS: A cross-sectional survey was carried out of adults aged 65 years or older living independently in Athens. Data were collected through clinical examination and interviews. Oral health-related quality of life was assessed through the Oral Impacts on Daily Performance (OIDP) indicator. The sample consisted of 681 participants. Data analysis used non-parametric tests (Mann-Whitney, Kruskal-Wallis and multiple logistic regressions). RESULTS: The response rate was 87.8%. Dentate participants with 1-10 teeth were 2.05 (1.25, 3.35) times and those with 11-20 teeth were 1.81 (1.11, 2.95) times more likely to report oral impacts than subjects with 21 or more teeth. Participants with anterior tooth spaces were 2.86 (1.70, 4.80) times more likely to report oral impacts than those without anterior spaces. Participants with 0-8 natural occluding pairs (NOPs) were 1.72 (1.14, 2.58) times and those with 0-3 posterior occluding pairs (POPs) were 1.57 (1.04, 2.36) times more likely to experience oral impacts than subjects with 9-16 NOPs and 4-10 POPs respectively. Decayed teeth were not significantly related to the presence of oral impacts. Edentulous participants with inadequate denture adaptation were 2.59 (1.46, 4.59) times, those with inadequate denture retention 2.41 (1.39, 4.17) times and those with denture overextension 2.51 (1.10, 5.74) times more likely to report oral impacts than subjects without the respective denture deficiencies. CONCLUSION: Clinical indicators of oral health status were significantly related to measures of oral health-related quality of life.

Aged↗
PubMed1988

[Reduction of the alveolar ridge: causes, sequelae and prevention].

The alveolar ridge (of upper and lower jaw) serves as a supporting tissue for the teeth. This function disappears after natural dentition has been extracted. Even so, the alveolar ridge remains very important, serving as it does to support and give retention to dentures. However, after removal of the natural dentition alveolar ridge reduction occurs, initially at a fairly rapid rate, slowing down later, but in an ever-continuing process, which, particularly in the long run, may have unpleasant consequences. As many factors may affect this reduction process unfavourably, it is very difficult to take one specific preventive measure. The most effective way of preventing alveolar ridge reduction is obviously the prevention of any edentulous condition, which unfortunately is not always possible. Nowadays a frequently used treatment of which a great deal is expected, is the application of the so-called overdenture. Further research is needed, however, for a proper evaluation of its long-term favourable effects on alveolar ridge reduction.

Aged↗