| 1. |
- Vult von Steyern, Per, et al.
(författare)
-
Fracture strength of two oxide ceramic crown systems after cyclic pre-loading and thermocycling
- 2006
-
Ingår i: Journal of Oral Rehabilitation. - : Wiley. - 1365-2842 .- 0305-182X. ; 33:9, s. 682-689
-
Tidskriftsartikel (refereegranskat)abstract
- The aim of the present study was to investigate the fracture resistance of zirconia crowns and to compare the results with crowns made of a material with known clinical performance (alumina) in away that reflects clinical aspects. Sixty crowns were made, 30 identical crowns of alumina and 30 of zirconia. Each group of 30 was randomly divided into three groups of 10 crowns that were to undergo different treatments: (i) water storage only, (ii) pre-loading (10 000 cycles, 30-300 N, 1 Hz), (iii) thermocycling (5-55 degrees , 5000 cycles) + pre-loading (10 000 cycles, 30-300 N, 1 Hz). Subsequently, all 60 crowns were subjected to load until fracture occurred. There were two types of fracture: total fracture and partial fracture. Fracture strengths (N) were: group 1, alumina 905/zirconia 975 (P = 0.38); group 2, alumina 904/zirconia 1108 (P < 0.007) and group 3, alumina 917/zirconia 910 (P > 0.05). Total fractures were more frequent in the alumina group (P < 0.01). Within the limitations of this in vitro study, it can be concluded that there is no difference in fracture strength between crowns made with zirconia cores compared with those made of alumina if they are subjected to load without any cyclic pre-load or thermocycling. There is, however, a significant difference (P = 0.01) in the fracture mode, suggesting that the zirconia core is stronger than the alumina core. Crowns made with zirconia cores have significantly higher fracture strengths after pre-loading.
|
|
| 2. |
- Haag, Per, et al.
(författare)
-
Questions and answers on titanium-ceramic dental restorative systems : a literature study
- 2007
-
Ingår i: Quintessence International. - : Quintessence. - 0033-6572. ; 38:1, s. e5-e13
-
Forskningsöversikt (övrigt vetenskapligt/konstnärligt)abstract
- OBJECTIVE: Titanium ceramics has become a topic of interest for prosthetic applications, thanks to the documented biocompatibility of commercially pure titanium. A number of concepts have been presented, including metal frameworks produced by casting or milling and a number of materials and methods for veneering. However, the concept has not reached a clinical breakthrough since failures have been reported from clinical experiences. METHOD AND MATERIALS: A PubMed search on the following key words was performed: titanium ceramics, long-term results. RESULTS: This review illustrates the fact that it is possible to have success with titanium ceramics on crucial criteria: fit and marginal adaptation, bond strength between metal and ceramics, and esthetic outcome. A review of clinical studies indicates a tendency for success rates to increase with time, which must be explained as a normal learning curve for a technical concept. The learning curve also includes development of materials and methods and the fact that there is a certain amount of technique sensitivity involved in the success rate for titanium ceramics. CONCLUSIONS: There is reason to believe that the outstanding clinical properties of titanium will further catalyze the development of titanium ceramics, and recent experiences clearly indicate that titanium ceramics, being a clinical product ready for use in fixed partial dentures, might already today challenge standard metal ceramics.
|
|
| 3. |
- Hallberg, Ulrika, et al.
(författare)
-
The subjective meaning of dentition and oral health : Struggling to optimize one's self-esteem
- 2007
-
Ingår i: International Journal of Qualitative Studies on Health and Well-being. - Basingstoke : Taylor & Francis. - 1748-2623 .- 1748-2631. ; 2:2, s. 86-92
-
Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to explore what dentition and oral health mean to adult dental care patients' well-being. Qualitative, taped interviews were conducted with 15 participants (over 20 years of age), who were patients at private and public dental health care units in the western part of Sweden. The constant comparative method of grounded theory was used. The interviews were consecutively analyzed in hierarchical coding processes until saturation was achieved. A conceptual model was generated illuminating the meaning of dentition and oral health for the participant's well-being. The core category of the model, struggling to optimize one's self-esteem, was related to four categories, which further described the psychosocial process of increasing one's self-esteem and contributing to well-being. These categories were labelled investing in oneself, being attractive to others, being able to socialize and showing ones social belonging. People who are satisfied with their teeth in terms of function and appearance seem to have developed an optimized self-esteem, which contributes to the well-being in individuals. Consequently, inequalities in oral health according to social belonging may lead to inequalities in self-esteem and well-being.
|
|
| 4. |
|
|
