Blanca Liliana Torres León

Effect of a denture cleanser on weight, surface roughness, and tensile bond strength of two resilient denture liners

STATEMENT OF PROBLEM Denture cleansers used in clinical practice can damage resilient denture lining materials. PURPOSE This study evaluated the effects of a denture cleanser on weight change, roughness, and tensile bond strength on 2 denture resilient lining materials. MATERIAL AND METHODS Forty specimens of microwave acrylic resin (Onda-Cryl), 30 mm in diameter and 4 mm thick, were prepared to verify weight change and surface roughness. The specimens were divided into 4 groups consisting of 10 specimens each, relined with a resilient liner (Coe Soft or Dentusoft), and treated (Polident or tap water). To evaluate tensile bond strength, 12 specimens were used for each group. All specimens were stored in artificial saliva for 15 days, immersed once a day in Polident or tap water, and evaluated at 0 hours and after 24 hours and 7 and 15 days. Roughness was evaluated by use of a profilometer. Weight changes were recorded in milligrams and expressed as the percentage of weight difference between the periods of evaluation. Tensile bond strength was determined with a universal testing machine. The specimens were placed under tension until failure by a cross-speed of 5 mm/min with a 500 Kg load cell. The type of failure was determined by use of stereoscopic microscopy at original magnification x8. The data were submitted to analysis of variance and compared by Tukeys test (alpha=.05). RESULTS Specimens immersed in Polident showed higher and significant (P<.05) weight changes (%) than those immersed in water between 24 hours and 7 days (Coe Soft-Polident: 0.48 +/- 0.09; Coe Soft-water: 0.28 +/- 0.09; Dentusoft-Polident: 0.44 +/- 0.16; Dentusoft-water: 0.22 +/- 0.15) and between 7 and 15 days (Coe Soft-Polident: 0.08 +/- 0.04; Coe Soft-water: -0.17 +/- 0.05; Dentusoft-Polident: 0.01 +/- 0.04; Dentusoft-water: - 0.24 +/- 0.03). There was significant difference (P<.05) in roughness (in micrometers), between treatments after 7 days (Coe Soft-water: 4.07 +/- 0.22; Coe Soft-Polident: 3.36 +/- 0.52; Dentusoft-water: 3.68 +/- 0.72; Dentusoft-Polident: 3.26 +/- 0.41) and 15 days (Coe Soft-water: 4.88 +/- 0.29; Coe Soft-Polident:3.53 +/- 0.61; Dentusoft-water: 4.42 +/- 1.12; Dentusoft-Polident: 3.68 +/- 0.37). Tensile bond strength was highest (P<.05) after 15 days (Coe Soft-water: 5.19 +/- 0.93; Coe Soft-Polident: 4.40 +/- 0.38; Dentusoft-water: 4.42 +/- 1.15; Dentusoft-Polident: 4.84 +/- 1.14). Most failures were cohesive (Coe Soft: 76.04% and Dentusoft: 82.29%). CONCLUSION Within the limitations of this in vitro study, specimens immersed in Polident demonstrated increased weight changes of resilient liners when compared with tap water, but surface roughness and tensile bond strength were unaffected.

Reabilitação Protética em Paciente com Displasia Ectodérmica Hipohidrótica: Caso Clínico

Resumo A Displasia Ectodermica e uma anomalia determinada por fatores geneticos, capaz de alterar as estruturas ectodermicas como os dentes, pele, cabelo, unhas, glândulas sudoriparas e sebaceas. Existem muitas variacoes da Displasia Ectodermica, sendo que, a Displasia Ectodermica Hipohidrotica ou Anidrotica ligada ao cromossomo X e a forma mais conhecida e uma das quais o cuidado odontologico e uma etapa muito importante do tratamento. Este trabalho teve como objetivo relatar um caso clinico de um paciente do sexo masculino, 06 anos de idade, portador de Displasia Ectodermica Hipohidrotica, em que seu tratamento consistiu na confeccao de uma Protese Total, em ambas as arcadas, com a intencao de melhorar suas condicoes esteticas, funcionais e psicologicas. Esse paciente procurou, junto a mae, a disciplina de Estomatologia II da Escola Bahiana de Medicina e Saude Publica com a queixa principal de “falta dos dentes desde o nascimento”. Apos a anamnese, exame clinico e radiografico foi estabelecido o diagnostico de Displasia Ectodermica Hipohidrotica e o paciente foi encaminhado para a disciplina de Protese Total com a finalidade de confeccionar duas Proteses Totais (superior e inferior). O resultado foi o resgate das condicoes esteticas, funcionais e psicologicas do paciente. Frente ao exposto, concluiu-se que o diagnostico e tratamento precoces sao fatores importantes para melhorar as condicoes esteticas, funcionais e psicologicas da crianca, permitindo seu desenvolvimento fisico, emocional e social. Alem disso, a instalacao da Protese Total permitiu uma melhor alimentacao e suspensao do habito de succao digital, constituindo uma alternativa satisfatoria para o tratamento reabilitador.