Although immediate implantation has not been previously recommended in infected sites, it is now becoming a procedure
of choice in modern implant dentistry. We report a case of a 65-year-old male ...patient, who required multiple tooth
extractions in the lower jaw and fabrication of a new overdenture in the lower jaw and a complete denture in the upper
jaw. Immediate implantation in infected tooth sockets followed extraction. Two NobelReplace™ Tapered implants (Nobel
BioCare, Zürich, Switzerland), one 13 mm long and 4.3 mm wide and the other 13 mm long and 5.0 mm wide, were
placed in the position 33 and 43. The site was sutured and a temporary denture was fabricated by adjusting the old denture.
After a period of three months the implant site was reopened and healing abutments were placed. Impressions were
made using the Impregum Penta Soft (3M ESPE, St. Paul, Minn, USA) polyether material. Ball Abutment Titanium™
was used as a patrix attachment and a matrix was inserted into the denture. Clinical examination and x-ray analysis after
six months showed no significant changes of the implants. Bone resorption was within standard values. Although it
is still a controversial subject, immediate implantation in infected sites can be a safe and predictable procedure if surgical
protocols are followed. However, further research is needed to draw firm conclusions.
The aim of this study was to assess and observe the oral hygiene and gingival condition in patients before and after fixed prosthodontic therapy through a 12-month period in combination with oral ...hygiene instructions. It was also analysed how factors, such as type of fixed prosthodontic appliance, constructive material, the position of a fixed partial denture (FPD) in the mouth, age and gender influenced oral hygiene. The dental arches were divided into three segments each and teeth and gingiva were examined using the Plaque and Gingiva Index by Silness and Löe, and for the mineralized deposits assessment the Calculus Index by Green and Vermillion was employed. The preliminary examination was conducted before the prosthodontic therapy, and the reexaminations were carried out 14 days, 1, 6 and 12 months after crown and/or FPD placement. A total of 93 subjects from the original study group of 146 patients attended all clinical examinations, while the rest was excluded. The sample consisted of 60 women, 33 men at age between 21 and 95 (average 51.8). A total of 39 patients had single crowns (C), 50 FPDs and 5 C+FPD. The frequency of plaque found during the preliminary visit was higher than that found in the other periods (p<0.001). Patients with C showed better oral hygiene levels than patients with FPDs or C+FPDs (p=0.001). Our results revealed no significant difference in oral hygiene status among patients with FPDs made of different materials (p=0.083). The worst hygiene levels were found in patients with fixed prosthodontic appliances in both jaws (p=0.012). Younger patients showed better hygiene levels than the older ones (p=0.002). Our research showed that appropriate educational and motivational measures can lead to improved oral hygiene, even after FPD placement. Presumably, the oral health in a group of adult patients can be kept acceptable by providing a prophylactic oral hygiene program.
Purpose: Commercially pure titanium (CP Ti) has been recognized in dentistry for its biocompatibility, good mechanical properties and corrosion resistance. Conventional manufacturing processes can ...affect surface quality and result in poor bonding of dental ceramics to CP Ti. This is why powder metallurgy (P/M) and wire electro-discharge machining (WEDM) are being introduced in the manufacturing process. The aim of this study was to evaluate the effect of WEDM on the surface composition and microstructure of P/M CP Ti samples produced for bond strength testing according to ISO 9693. Materials and methods: Eight samples of P/M CP Ti, dimensions according to ISO 9693, were made using WEDM and divided in two groups (untreated and grinded). Microanalyses of chemical composition and microstructure of both groups were made using SEM, EDS and XDR. Results: SEM and EDS analysis of untreated samples showed a thin layer on surfaces with fractures in it. Grinded samples showed homogenous structure with no layer and no fractures. XDR analysis showed high level of oxides on the surface of untreated samples, while after grinding only pure a-phase was found. Conclusion: WEDM is a suitable method of sample production for ISO 9693 if accompanied by grinding with silicon carbide papers P320-P4000. Key words Titanium, WEDM, bond strength, powder metallurgy, Surface Properties Komercijalno cisti titanij (CP Ti) se koristi u dentalnoj medicini zbog biokompatibilnosti, dobrih mehanickih svojstava i otpornosti na koroziju. Konvencionalni proizvodni procesi izrade takvog titanija mogu utjecati na kvalitetu povrsine uzoraka i rezultirati slabim vezanjem CP Ti s dentalnom keramikom. Zato se uvode nove tehnologije proizvodnje titanija, primjerice metalurgija praha i oblikovanje na erozimatu s zicom (WEDM). Svrha ovog istrazivanja jest odrediti utjecaj WEDM-a na povrsinu uzoraka P/M CP Ti proizvedenih za ispitivanje vezne cvrstoce prema normi ISO 9693. Materijali i metode: Osam uzoraka P/M CP Ti dimenzija prema normi ISO 9693 proizvedeno je koristenjem WEDM-a i podijeljeno u dvije grupe--u neobradene i brusene. Povrsine obje grupe uzoraka analizirane su metodama SEM, EDS i XDR. Rezultati: Analize neobradenih uzoraka metodama SEM i EDS pokazuju tanki sloj razlicitog sastava i frakture. Bruseni uzorci imaju homogenu strukturu bez fraktura. Analiza metodom XDR pokazuje visoku koncentraciju titanijevih oksida na povrsini neobradenih uzoraka, a nakon brusenja dobivena je samo cista a-faza. Zakljucak: WEDM je metoda prikladna za proizvodnju uzoraka prema normi ISO 9693, ako se uzorci naknadno bruse. Kljucne rijeci titanij; erozimati sa zicom; vezna cvrstoca; metalurgija praha; svojstva povrsina
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