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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 32 (2005), S. 0 
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: summary  The aim of this study was to compare titanium-reinforced ZrO2 and pure Al2O3 abutments regarding their outcome after chewing simulation and static loading. Forty-eight standard diameter implants with an external hexagon were divided into three groups of 16 implants each and restored with three different types of abutments (group A: ZrO2 abutments with titanium inserts; group B: Al2O3 abutments; group C: titanium abutments). All abutments were fixated on the implants with gold-alloy screws at 32 Ncm torque, and metal crowns were adhesively cemented onto the abutments. The specimens were exposed to 1·2 million cycles in a chewing simulator. Surviving specimens were subsequently loaded until fracture in a static testing device. Fracture loads (N) and fracture modes were recorded. A Wilcoxon Rank test to compare fracture loads among the three groups and a Fisher exact test to detect group differences in fracture modes were used for statistical evaluation (P 〈 0·05). All specimens but one of group B survived chewing simulation. No screw loosening occurred. The median fracture loads (±s.d.) were as follows: group A, 294 N (±53); group B, 239 N (±83), and group C, 324 N (±85). The smaller fracture loads in group B were statistically significant. The use of pure Al2O3 abutments resulted in significantly more abutment fractures. It is proposed that titanium-reinforced ZrO2 abutments perform similar to metal abutments, and can therefore be recommended as an aesthetic alternative for the restoration of single implants in the anterior region. All-ceramic abutments made of Al2O3 possess less favourable properties.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: abstract  A multi-centre randomized clinical trial is under way at 14 university dental schools in Germany to compare prosthodontic treatments for the shortened dental arch (SDA). One of the aims of this pilot-study was to measure the effect of two treatment options of the SDA on oral health-related quality of life and on the Research Diagnostic Criteria (RDC) for temporomandibular disorders (TMD). Thirty-four patients participated in the pilot-study. Inclusion criteria were: all molars were missing and the presence of at least both canines and one premolar in each quadrant. Participants were randomly assigned to receive either removable partial dentures including molar replacement (RPD_group) or retain a premolar occlusion (PROC_group). The Oral Health Impact Profile (OHIP-49) and the RDC for TMD were completed by participants before treatment (pre-treatment), 6 weeks (6wks), 6 months (6m) and 12 months (12m) after treatment. At the 12-month follow up, data of 10 women and 11 men (mean age: 62 ± 10 years) were available. Medians of the OHIP total-scores were as follows: RPD (n = 10), 43·5 (pre-treatment), 18·2 (6wks), 13·3 (6m), 14·7 (12m). PROC (n = 11): 31·8 (pre-treatment), 27·1 (6wks), 8·8 (6m), 8·3 (12m). Significant differences were shown for RPD_group between pre-treatment and 6m/12m and for PROC_group between pre-treatment and 6m. There were no significant differences between treatment groups at any time. Within each group, an improvement of life-quality was observed. No significant difference could be reported between the two therapy concepts. This may be due to the low sample size within the pilot study.
    Type of Medium: Electronic Resource
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