RESUMO
STATEMENT OF PROBLEM: The choice of soft materials for maxillofacial prostheses is important for covering extraoral defects after tumor surgery or radiation therapy. The use of cast commercially pure titanium as reinforcement seems to be a suitable option. PURPOSE: Making use of the advantages of titanium frameworks for maxillofacial prostheses requires exploring ways of combining it with soft materials. This study investigated such combinations and evaluated discoloration of the soft material to determine whether it was attributable to the titanium reinforcement. MATERIAL AND METHODS: Five soft materials used for maxillofacial prostheses and their bond strengths to cast titanium were tested. Different ways of conditioning the titanium surface and different adhesives were used. Plain mechanical retention was also studied. The Gretag SPM 100 was used to determine the potential effects on coloring after 24 hours of radiation in the Suntest rapid exposure unit. RESULTS: Suitable material combinations for bonding soft materials to titanium were found for all soft materials studied. Bond strength varied depending on the chemical basis of the soft material. Results indicated that maximal bond strengths were obtained by the combinations Supersoft with Super-Bond, Supersoft with subsequent silicoating, and bonding with Dentacolor connector. Few color shifts attributable to the titanium reinforcement were evident in the 2-mm layers of the soft materials applied. CONCLUSION: The results of this study showed that it is possible to combine a titanium framework and soft silicone materials.
Assuntos
Materiais Biocompatíveis/química , Colagem Dentária , Prótese Maxilofacial , Titânio/química , Resinas Acrílicas/química , Resinas Acrílicas/efeitos da radiação , Adesivos/química , Adesivos/efeitos da radiação , Materiais Biocompatíveis/efeitos da radiação , Bis-Fenol A-Glicidil Metacrilato/química , Bis-Fenol A-Glicidil Metacrilato/efeitos da radiação , Compostos de Boro/química , Compostos de Boro/efeitos da radiação , Cor , Dimetilpolisiloxanos/química , Dimetilpolisiloxanos/efeitos da radiação , Humanos , Metacrilatos/química , Metacrilatos/efeitos da radiação , Metilmetacrilatos/química , Metilmetacrilatos/efeitos da radiação , Ácidos Polimetacrílicos/química , Ácidos Polimetacrílicos/efeitos da radiação , Polimetil Metacrilato/química , Polimetil Metacrilato/efeitos da radiação , Polivinil/química , Polivinil/efeitos da radiação , Pigmentação em Prótese , Doses de Radiação , Cimentos de Resina/química , Cimentos de Resina/efeitos da radiação , Silanos/química , Silanos/efeitos da radiação , Silicones/química , Silicones/efeitos da radiação , Siloxanas/química , Siloxanas/efeitos da radiação , Estresse Mecânico , Luz Solar , Propriedades de Superfície , Titânio/efeitos da radiaçãoRESUMO
It is very difficult to prepare structures of heterogeneous materials, material interfaces, or sensitive biologic samples. The usual grinding, cutting, or fracturing methods are mostly material destructive because of resulting shear strengths. Ion beam slope cutting allows microcuts to be accurately placed into subsurface areas. The material reduction is based on the principles of ion sputtering, whereby atoms are removed in the area of ion incidence. The speed of removal depends on the sputtered material, amounting to several micrometers per hour. Approximately 40 biologic dental specimens of various origin were examined. Depending on the incidence angle of the ion beam, the typical structures of ion etching can be reduced or intensified. Both variants are used to obtain a precise judgment of morphologic details or an exact topography of failures.
