Alternative treatment to orthognatic surgery by the application of digital smile planning.

Through the use of the application of a mathematical proportion and a digital golden ratio compass associated with computer software, Digital Smile Planning (DSP) can assist clinicians to achieve the fundamentals of esthetic treatment. The present clinical report describes the application of this technique to propose an alternative and more conservative treatment for a patient who refused the option of orthognathic surgery. To address the diagnosis of a gingival smile with vertical maxillary excess, the alternative treatment comprised crown lengthening surgery, ceramic veneers on the maxillary teeth, and the application of botulinum toxin to reduce lip hyperactivity. Considering the successful resolution of the patient's situation from the perspective of both the dentist and the patient, the application of DSP was considered to be useful to achieve predictable harmony between the face and the dental structures.

Effect of thermocycling on the tensile and shear bond strengths of three soft liners to a denture base resin

STATEMENT OF PROBLEM: In clinical practice, loss of adhesion between the silicone-based denture liner and the denture base resin is always an undesirable event that might cause loss of material softness, water sorption, bacterial colonization and functional failure of the prosthesis. PURPOSE: This study evaluated the effect of thermocycling on tensile and shear bond strengths of three soft liner materials to a denture base acrylic resin. MATERIAL AND METHODS: Three resilient liners (Mucopren-Soft, Mollosil-Plus and Dentusil) and a heat-polymerized acrylic resin (QC-20) were processed according to manufacturers' directions. Sixty specimens (14 x 14 mm cross-sectional area) per bond strength test (20 for each liner) were fabricated and either stored in water at 37°C for 24 hours (control groups; n=10) or thermocycled 3,000 times in water between 5°C and 55°C (test groups; n=10). The specimens were tested in tensile and shear strength in a universal testing machine until fracture. Bond strength means were compared between water-stored and thermocycled groups for each material, as well as among materials for each treatment (water storage or thermocycling). Failure mode (adhesive, cohesive and mixed) after debonding was assessed. Data were analyzed statistically by paired Student's t-test and ANOVA at 5 percent significance level. RESULTS: The water-stored groups had statistically significant higher bond strengths than the thermocycled groups (p<0.05). Without thermocycling, Mucopren-Soft (2.83 ± 0.48 MPa) had higher bond strength than Mollosil-Plus (1.04 ± 0.26 MPa) and Dentusil (1.14 ± 0.51 MPa). After thermocycling, Mucopren-Soft (1.63 ± 0.48 MPa) had the highest bond strength (p<0.05). CONCLUSION: The bond strength of the three soft denture liners tested in this study changed with their chemical composition and all of them exhibited higher bond strengths than those usually reported as clinically acceptable. CLINICAL IMPLICATIONS: All soft ...

Effect of thermocycling on the tensile and shear bond strengths of three soft liners to a denture base resin.

STATEMENT OF PROBLEM: In clinical practice, loss of adhesion between the silicone-based denture liner and the denture base resin is always an undesirable event that might cause loss of material softness, water sorption, bacterial colonization and functional failure of the prosthesis. PURPOSE: This study evaluated the effect of thermocycling on tensile and shear bond strengths of three soft liner materials to a denture base acrylic resin. MATERIAL AND METHODS: Three resilient liners (Mucopren-Soft, Mollosil-Plus and Dentusil) and a heat-polymerized acrylic resin (QC-20) were processed according to manufacturers' directions. Sixty specimens (14 x 14 mm cross-sectional area) per bond strength test (20 for each liner) were fabricated and either stored in water at 37 degrees C for 24 hours (control groups; n=10) or thermocycled 3,000 times in water between 5 degrees C and 55 degrees C (test groups; n=10). The specimens were tested in tensile and shear strength in a universal testing machine until fracture. Bond strength means were compared between water-stored and thermocycled groups for each material, as well as among materials for each treatment (water storage or thermocycling). Failure mode (adhesive, cohesive and mixed) after debonding was assessed. Data were analyzed statistically by paired Student's t-test and ANOVA at 5% significance level. RESULTS: The water-stored groups had statistically significant higher bond strengths than the thermocycled groups (p<0.05). Without thermocycling, Mucopren-Soft (2.83 +/- 0.48 MPa) had higher bond strength than Mollosil-Plus (1.04 +/- 0.26 MPa) and Dentusil (1.14 +/- 0.51 MPa). After thermocycling, Mucopren-Soft (1.63 +/- 0.48 MPa) had the highest bond strength (p<0.05). CONCLUSION: The bond strength of the three soft denture liners tested in this study changed with their chemical composition and all of them exhibited higher bond strengths than those usually reported as clinically acceptable. CLINICAL IMPLICATIONS: All soft lining materials tested in this study showed a significant decrease in the bond strength to an acrylic denture base resin after thermocycling. In spite of thermocycling, though, the silicone-based liners had satisfactory bond strengths for clinical application.

O efeito da termociclagem na resistência adesiva entre materiais reembasadores resilientes de silicone com resina acrílica termopolimerizável / Thermocycling effect in the bond strength between resilient material of silicon-based with hot cure acrylic resin

Avaliou-se e comparou-se o efeito da termociclagem na resistência à tração e ao cisalhamento da interface de união de três materiais resilientes à base de silicone (Mucopren Soft, Dentusil, Mollosil Plus) com resina acrílica termopolimerizada indicada para base prótese total. A resina selecionada foi a QC-20 (DENTSPLY). As amostras foram divididas em dois grupos: o primeiro foi submetido ao teste no termociclador, onde foram realizados 3.000 ciclos térmicos, alternando banhos de um minuto em água destilada a 5°±1°C e um minuto em a 55°±1°C. Já o segundo grupo de amostras foram armazenadas em água a 37°C durante 24 horas. Para os ensaios mecânicos, empregou-se a máquina de ensaio universal EMIC DL -10.000 com velocidade constante de 5mm/min. Os resultados obtidos indicam que, em relação à resistência à tração e ao cisalhamento; à resistência da união, independentemente do tratamento recebido (com ou sem termociclagem), o material Mucopren Soft apresentou os maiores valores nos dois tipos de ensaio de resistência; e o Mollosil Plus (o menor na tração) e o Dentusil (o menor no cisalhamento); além disso, todos os materiais neste estudo tiveram uma diminuição em sua adesão à base de resina acrílica após os testes de termociclagem

Utilização da técnica Zanetti em implantodontia associada à técnica de moldeira individual aberta. Relato de caso clínico / The zanetti technique an alternative open tray transfer impression procedure in implant dentistry

O presente trabalho apresenta um caso clínico de reabilitação oral do arco superior por intermédio de implantes associados à prótese-fixa. A moldagem de transferência foi realizada utilizando-se a Técnica Zanetti para montagem em articulador semi-ajustável. Este procedimento objetivou demonstrar que essa técnica auxilia a montagem do arco superior em uma só etapa, evitando, desta forma, a incorporação de possíveis erros associados à sequência de montagem convencionais