1,721,186 research outputs found
Ceramiche densamente sinterizzate: influenza del trattamento di superficie sull’adesione di un cemento composito
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Undetected excess cement at marginal areas of zirconia crown copings : In vitro analysis of two luting agents and their influence on retention
No full textPurpose: To evaluate the amount of residual cement (ECL) around the margins of zirconia crown copings after careful luting and cleaning procedures and to investigate these factors in relation to two tested luting materials. Materials and Methods: An experimental model of a maxillary arch was selected for this in vitro study. The maxillary first molar was prepared to receive an all-ceramic, single, full-crown restoration with a finish line located 1 mm below the artificial gingiva. After scanning of the prepared tooth, 20 paired zirconia coping-abutment assemblies were CAD/CAM fabricated. A slot in the model allowed for insertion and removal of the assemblies for each new test. Specimens were divided into two groups according to the cementation procedure: half (n = 10) were luted using a resin-modified glass-ionomer (RMGI) (Ketac-Cem Plus) (GI group), and the other half with a dual-curing self-adhesive resin agent (RelyX Unicem 2) (UN group). The substructures were loaded with cement, and a customized preseating device was adopted for preliminary reduction of excess. The zirconia copings were finally seated on their respective abutments located on the simulation model. A blinded investigator attempted to remove all excess cement with clinically available instruments. The amount of excess cement left in situ after cleaning procedures was weighed in grams. Dislodging forces of luted coping-abutment assemblies were obtained by using pull-off tests in a universal testing machine (crosshead speed of 0.5 mm/minute) after 24 hours of water storage. Means and standard deviations were calculated for ECL and for retention force values, and Mann-Whitney and ANOVA tests were carried out to detect significant differences (α =.05) among groups. Results: Cement remnants were found in all specimens despite the cleaning procedures, with a typical distribution in interproximal areas. Mean ECL values for the GI and UN groups were 0.0079 ± 0.0060 and 0.0107 ± 0.0081, respectively. No statistically significant differences were found between tested cements (P =.3284). Removal stress values (MPa) were significantly higher (P =.0313) for the UN group (12.4 ± 6.5) than for the GI group (6.57 ± 4.69). Conclusion: Similar amounts of undetected cement remnants were discovered around the esthetic margins of zirconia crown copings regardless of cement type. The luting procedure using the self-adhesive resin cement provided significantly higher early retention values than the RMGI material
Prosthetic restoration in the single-tooth gap : patient preferences and analysis of the WTP index
No full textObjective. The objective of this study was to evaluate the preference of a patients' population, according to the index of willingness to pay (WTP), against two treatments to restore a single-tooth gap: the implant-supported crown (ISC) and the 3-unit fixed partial denture prosthesis (FPDP) on natural teeth.
Materials and methods. Willingness to pay values were recorded on 107 subjects by asking the WTP from a starting bid of €2000 modifiable through monetary increases or decreases (€100). Data were collected through an individually delivered questionnaire. The characteristics of the population and choices made, the median values and WTP associations with socio-demographic parameters (Mann–Whitney and Kruskal–Wallis tests), correlations between variables (chi-square test in contingency tables) and significant parameters for predicting WTP values obtained in a multiple linear regression model were revealed.
Results. The 64% of patients expressed a preference for ISC, while the remaining 36% of the population chose the FPDP. The current therapeutic choice and those carried out in the past were generally in agreement (>70% of cases, P = 0.0001); a relationship was discovered between the anterior and posterior area to the same method of rehabilitation (101 of 107 cases, 94.4%). The WTP median values for ISC were of €3000 and of €2500 in the anterior and posterior areas, respectively. The smallest amount of money has been allocated for FPDP in posterior region (median of €1500). The “importance of oral care” for the patient was a significant predictor, in the regression model analysis, for the estimation of both anterior (P = 0.0003) and posterior (P < 0.0001) WTP values. The “previous therapy” variable reached and was just close to significance in anterior (P = 0.0367) and posterior (P = 0.0511) analyses, respectively.
Conclusions. Within the limitations of this study, most of the population (64%) surveyed indicated the ISC as a therapeutic solution for the replacement of a single missing tooth, showing a higher WTP index in the anterior area. Among investigated socio-demographic variables, the importance assigned by the patient to oral care appeared to influence WTP values of the rehabilitation, regardless the location of the single gap in the mouth
Influenza della preparazione dentale sull’adattamento marginale di una ceramica fresata in biossido di zirconio
No full textD. Augusti Pfeifferi Antiquitates Ebraicae Selectae : Unde quamplurimis Scripturae locis facula accenditur
No full textD. AUGUSTI PFEIFFERI ANTIQUITATES EBRAICAE SELECTAE : UNDE QUAMPLURIMIS SCRIPTURAE LOCIS FACULA ACCENDITUR
D. Augusti Pfeifferi Antiquitates Ebraicae Selectae : Unde quamplurimis Scripturae locis facula accenditur (1)
Cover (1)
Title page (3)
Kupfertitel (8)
Titelblatt (9)
Dedicatio (11)
Praefatio Ad Lectorem (18)
Index Rerum Praecipuarum (23)
Caput I. - X. (31)
Caput XI. - XX. (109)
Caput XXI. -X XX. (186)
Fotodokumentation (249
INFLUENZA DEL CEMENTO PROVVISORIO SULL'ADESIONE TRA CEMENTO COMPOSITO E SUBSTRATO DENTINALE
No full textPrincipi di adesione applicati ai substrati dentali e relazionati alle moderne metodiche cliniche
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