Evaluation of three different processing techniques in the fabrication of complete dentures

Abstract

Aims and Objectives:The objective of the present study is to compare the effectiveness of three different processing techniques and to find out the accuracy of processing techniques through number of occlusal interferences and increase in vertical dimension after denture processing.Materials and Methods:A cross-sectional study was conducted on a sample of 18 patients indicated for complete denture fabrication was selected for the study and they were divided into three subgroups. Three processing techniques, compression molding and injection molding using prepolymerized resin and unpolymerized resin, were used to fabricate dentures for each of the groups. After processing, laboratory-remounted dentures were evaluated for number of occlusal interferences in centric and eccentric relations and change in vertical dimension through vertical pin rise in articulator. Data were analyzed using statistical test ANOVA and SPSS software version 19.0 by IBM was used.Results:Data obtained from three groups were subjected to one-way ANOVA test. After ANOVA test, results with significant variations were subjected to post hoc test. Number of occlusal interferences with compression molding technique was reported to be more in both centric and eccentric positions as compared to the two injection molding techniques with statistical significance in centric, protrusive, right lateral nonworking, and left lateral working positions (P < 0.05). Mean vertical pin rise (0.52 mm) was reported to more in compression molding technique as compared to injection molding techniques, which is statistically significant (P < 0.001).Conclusions:Within the limitations of this study, injection molding techniques exhibited less processing errors as compared to compression molding technique with statistical significance. There was no statistically significant difference in processing errors reported within two injection molding systems.

Efecto de combinación de materiales de inclusión a diferentes presiones sobre movilidad de dientes artificiales durante el procesamiento protésico

“…Las prótesis completas constituyen una estructura artificial con base acrílica y dientes artificiales, alternativa para recuperar las funciones masticatoria, fonética y estética facial 1,2 perdidas 3,4,6 exigiendo considerar en su construcción variaciones anatómicas [31][32][33] e inclusive psicológicas del paciente 28,29 . La colocación de los dientes artificiales constituye un paso fundamental 30 cuyas modificaciones se encuentran asociadas al desplazamiento de sus bases protésicas 6 , composición del acrílico y de procesamiento 12,18,25 que se traducen en alteraciones oclusales 28 evidenciadas en aumento de la dimensión vertical 34 .…”

“…Tras fijar los modelos en el articulador semiajustable (Bio Art A7 Plus, Brasil), mediante el arco facial y el registro de mordida, fue establecida la forma, tamaño y color de los dientes artificiales (66, tamaño 3D, 34L; Duratone, Colombia) que fueron adaptados y enfilados siguiendo protocolos establecidos 26 ; con un esquema oclusal balanceado bilateral, cuyas características fueron el contacto de todos los dientes en máxima intercuspidación y durante los movimientos mandibulares excéntricos, así las fuerzas oclusales propiciadas por los movimientos son compartidas por todos los dientes y en conjunto con las articulaciones temporomandibulares mejorando la estabilidad de la prótesis total, proporcionando una menor reabsorción del reborde alveolar 27,28 .…”

Assessment of Hardness, Flexural Modulus, and Bond Strength of Acrylic Denture bases Fabricated by 3D Digital Methods

“…Fabrication of the acrylic denture bases from heat-cured polymethyl methacrylate (PMMA) by compression molded technique still the most popular choice for clinicians in the dental office (1) . The popularity of this fabrication method in denture bases construction is gained due to its simplicity, as well as this technique needs only simple processing equipment (2) . Moreover, its low cost, ease of repair, relative higher mechanical properties, low density, and acceptable esthetic favored their popularity over other processing techniques (2,3) .…”

“…The popularity of this fabrication method in denture bases construction is gained due to its simplicity, as well as this technique needs only simple processing equipment (2) . Moreover, its low cost, ease of repair, relative higher mechanical properties, low density, and acceptable esthetic favored their popularity over other processing techniques (2,3) . However, the recent fabrication methods were introduced in the dental practice such as the injection-molded method and the revolutionized computer-aided design and computer-aided manufacturing (CAD/CAM) digital method (4,5) .…”

Effect of Thermal Cycling on Flexural Properties of Microcrystalline Cellulose‐Reinforced Denture Base Acrylic Resins

“…Poly (methyl methacrylate) (PMMA) has been the material of choice for conventional dentures 2,3 for the past 8 decades. The advantages of this material include the ease in processing and equipment use, 4 costeffectiveness, 5 and its ability to mimic the color and appearance of oral tissues. 6 With use, the denture base is subjected to many different influences, such as biting forces, thermal changes, exposure to saliva, food, and water, and mechanical blows, that may result in denture failure and/or fracture.…”