Ispitivanje kermetskih namenskih ispuna na retencionim zubima pokretne parcijalne skeletirane proteze

The aim of the study was to describe the clinical process of setting the purpose filling on abutment teeth, after finishing the removable partial dentures. The aim was also to investigate the use of cermet glass-ionomer cement for the purpose filling in the abutment teeth for removable partial dentures, as well as to investigate the surface of the purpose filling. For the clinical evaluation of purpose filling slightly modified criteria according to Ryg's were used in 20 patients with different type of edentulousness. Changes occurring on the surface of purpose filling have been experimentally established by the method of scanning electron microscopy on the half-grown third molars in seven patients. It could be concluded that cement glass-ionomer was not the appropriate material for the purpose fillings in abutment teeth for removable partial dentures.Cilj rada je bio da se opiše klinički postupak postavljanja namenskih ispuna na retencione zube posle izrade parcijalne skeletirane proteze i klinički proceni stanje, a takođe analiziraju promene nastale na spoljašnjoj površini namenskih ispuna od doziranog kermet glas-jonomer cementa preko kojih su se nalazili elementi parcijalne skeletirane proteze. Za kliničku procenu stanja namenskih ispuna korišćeni su nešto izmenjeni kriterijumi po Ryge-y kod 20 osoba različitog tipa krezubosti. Promene nastale na površini ispuna eksperimentno su utvrđene metodom skenirajuće elektronske mikroskopije na poluimpaktiranim trećim molarima kod 7 osoba. Za namenske ispune neophodno je koristiti samo materijale koji imaju visoku otpornost na mehanička opterećenja i abrazivnost. Kermet glas-jonomer cementi su nepouzdan materijal za upotrebu na retencionim zubima usled progresivnog opadanja kvaliteta ispuna i pojave destruktivnih promena na površini sa uočenim pukotinama i defektima posle opservacionog perioda od 36 meseci

Ispitivanje kermetskih namenskih ispuna na retencionim zubima pokretne parcijalne skeletirane proteze

The aim of the study was to describe the clinical process of setting the purpose filling on abutment teeth, after finishing the removable partial dentures. The aim was also to investigate the use of cermet glass-ionomer cement for the purpose filling in the abutment teeth for removable partial dentures, as well as to investigate the surface of the purpose filling. For the clinical evaluation of purpose filling slightly modified criteria according to Ryg's were used in 20 patients with different type of edentulousness. Changes occurring on the surface of purpose filling have been experimentally established by the method of scanning electron microscopy on the half-grown third molars in seven patients. It could be concluded that cement glass-ionomer was not the appropriate material for the purpose fillings in abutment teeth for removable partial dentures

Opravdanost formiranja aktivnih protetskih segmenata

The aim of this paper was to examine the justification of forming active prosthetic segments on the abutment teeth for the incline of the elements of removable partial denture. Methods. The investigation was performed during 3-years observational period, at the Prosthodontic Clinics of Belgrade University Dental School, and the Military Medical Academy (MMA). During the mentioned observation period two groups of 200 patients with different kinds of edentulousness were analyzed, indicated for the design of metal frame removable partial dentures (MFRPD) with cast clasps. A total of 400 patients represented 50% of the sample chosen by random choice method for the determined observational period and dental institutions. Results. The evaluation of justification of the abutment teeth preparation was done during the analysis of the requirement of forming: guide planes, planes for occlusal rests, vestibular under cut, oral under cut. Conclusion. Upon the evaluation of the performed analyses the following can be concluded: during the composition of every MFRPD it is necessary to use at least two or more guide planes, depending on the type edentulousness of patients' teeth; formation of guide planes is performed in excessively high number of the abutment teeth (over 95%); during the composition of each particular MFRDP it is necessary to use as more occlusal rests as possible, at least 3, or more, which also depends on the type of patients' edentulousness; composition of the planes for occlusal rest has to be performed in almost all the patients (over 95% of the abutment teeth); vestibular planes of the abutment teeth should be prepared in over 50% of the used teeth; oral planes are prepared within the preparation of the abutment teeth for other active prosthetic segments. Conclusion. It is necessary to perform the composition of active prosthetic segments according to the plan established for the study models, both if the preparation of teeth for the adoption of MFRDP elements with clasps represents the use of an uninvasive, or an invasive dental method.Cilj rada predstavlja ispitivanje opravdanosti formiranja aktivnih protetskih segmenata na retencionim zubima za prihvatanje elemenata parcijalnih skeletiranih proteza. Metode. Ispitivanje je obavljeno u okviru opservacionog perioda od tri godine na Klinikama za stomatološku protetiku Stomatološ kog fakulteta Univerziteta u Beogradu i Vojnomedicinske akademije( VMA). Analizirano je po dve stotine pacijenata različitih vrsta krezubosti, sa postavljenim indikacijama za izradu parcijalne skeletirane proteze (PSP) sa livenim kukicama. Svih četiri stotine pacijenata predstavljaju 50% uzorak odabran metodom slučajnog izbora za dati opservacioniu period i stomatološke ustanove. Rezultati. Procena opravdanosti pripreme retencionih zuba, izvršena je u okviru analiziranja potrebe formiranja: vodećih površina, ležišta za okluzalne naslone, vestibularne podminiranosti i oralne podminiranosti. Prilikom izrade svake PSP neophodno je korišćenje najmanje dve ili više vodećih površina. Formiranje vodećih površina vrši se kod izuzetno velikog broja retencionih zuba (preko 95%). Pri izradi PSP neophodno je korišćenje što većeg broja okluzalnih naslona, (najmanje tri i više), što svakako takođe zavisi od vrste krezubosti pacijenta. Formiranje ležišta za okluzalne naslone mora se izvesti kod skoro svih pacijenata (preko 95% retencionih zuba), a vestibularne površine retencionih zuba trebalo bi pripremiti kod preko 50% korišćenih zuba. Oralne površine se pripremaju u okviru pripreme retencionih zuba za ostale aktivne protetske segmente. Zaključak. Bez obzira da li priprema zuba za prihvatanje elemenata PSP sa livenim kukicama predstavlja korišćenje jedne od neinvazivnih ili invazivnih stomatoloških metoda, obavezno je izvršiti formiranje aktivnih protetskih segmenata i to prema planu postavljenom na modelu za studije

Dedicated composite fillings − inlays

Background. The aim of the study was to evaluate the quality and persistance of esthetics of dedicated inlay by clinical methods. Methods. The paper reviews the clinical significance and technique of preparing particular composite inlays before and after the construction of the metallic framework partial denture. On the basis of indications the total of 30 inlays were placed into cavities under relatively dry working conditions. Six, twelve eighteen and twenty-four months after the placement of filling, control check-up was carried out by Ryge criteria. Results. After two years marginal discoloration as well as the change of the colour occured in 3.3% of inlays. There was neither detectable secondary caries, nor the symtoms of pulpal damage. The requirements to be fulfilled concerning the composite materials in order that they can be implemented for this purpose, were also discussed. Conclusion. From the clinical point of view, purpouse inlays from Herculite XRV lab C8B in combination with Opti Bond System and composite cement Porcelite Dual Cure showed high functional and esthetic values in the observational period of two years