The influence of vertical dimension of occlusion changes on the electroencephalograms of complete denture wearers

Matsuda, Ryozo; Yoneyama, Yoshikazu; Morokuma, Masakazu; Ohkubo, Chikahiro

doi:10.1016/j.jpor.2014.01.003

Cited by 17 publications

(15 citation statements)

References 21 publications

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“…4 Recently, a study examined how VDO can affect brain function in complete denture wearers, and also measured occlusal forces when there is a change in VDO in which electroencephalograms were used. 5 Many authors have pointed out the necessity of creating complete new dentures, or relining of the denture base, which is not a simple procedure and presents financial pressure for the patients. 6 So, finding the new combination of materials with improved mechanical properties, which include better wear resistance, would be helpful for many reasons for those patients.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of PMMA/ZnO nanoparticles composite used for resin teeth

Popović¹,

Bobovnik²,

Bolka³

et al. 2017

Mater. Tehnol.

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Wear resistance is one of the most important physical properties of the artificial teeth used in acrylic dentures. The goal of this research was to synthesize a new composite material made of matrix Poly-(methyl methacrylate)-PMMA with different percentages (2 % and 3 % of volume fractions) of zinc-oxide nanoparticles (ZnO NPs) as reinforcing elements, to improve its mechanical properties. The dynamic mechanical behaviour of this composite was studied through the DMA method in comparison to the pure PMMA supported by the characterization of their microstructures. Then the wear resistance was analysed on the samples, which were prepared in the form of teeth. In this context their vertical height loss was measured after 100,000 chewing cycles on a chewing simulator, before and after the artificial thermal ageing. Investigations showed that the PMMA/ZnO NP composites dampened the vibrations better than the pure PMMA, which could be assigned to the homogenous distribution of ZnO NPs in the PMMA matrix. It was found that the mean vertical height loss for the pure PMMA teeth was significantly higher (more than 4 times) compared to composite teeth made with ZnO NPs. Introducing the thermal artificial ageing led to the finding that there was no effect on the height loss by the composite material with 3 % of volume fractions of ZnO NPs. Based on this it was concluded that PMMA/ZnO NPs composites showed improved in-vitro wear resistance compared to acrylic-resin denture teeth, so this new composite material should be preferred when occlusal stability is considered to be of high priority. Keywords: poly-(methyl methacrylate)-PMMA, zinc-oxide nanoparticles, composite, resin teeth Odpornost proti obrabi je ena izmed najbolj pomembnih fizikalnih lastnosti umetnih zob pri akrilnih protezah. Cilj te raziskave je bil sintetiziranje novega kompozitnega materiala, izdelanega iz matrice poli-(metil meta akrilata)-PMMA z razli~nimi volumskimi odstotki (2 % in 3 %) nanodelcev cinkovega oksida (ZnO NPs), uporabljenimi kot oja~itveni element za izbolj{anje mehanskih lastnosti materiala. Dinami~no mehansko obna{anje teh kompozitov smo raziskali z metodo DMA v primerjavi s istim PMMA, ter s karakterizacijo njihovih mikrostruktur. Nato je bila analizirana odpornost proti obrabi na vzorcih, ki so bili pripravljeni v obliki zob. Izmerjena je bila njihova navpi~na izguba vi{ine po 100.000`ve~ilnih ciklih na`ve~ilnem simulatorju, pred in po umetnem toplotnem staranju. Preiskave so pokazale, da so PMMA/ZnO NPs kompoziti bolje bla`ili vibracije kot~isti PMMA, kar lahko pripi{emo homogeni porazdelitvi ZnO NPs v PMMA matrici. Ugotovili smo, da je bila povpre~na navpi~na izguba vi{ina za~isti PMMA zob znatno vi{ja (ve~kot 4×) v primerjavi s kompozitnimi zobmi z ZnO NPs. Umetno toplotno staranje ni imelo u~inka na izgubo navpi~ne vi{ine zoba iz kompozitnega materiala s 3 volumskimi % ZnO NPs. Na podlagi tega smo sklenili, da imajo kompoziti PMMA/ZnO NPs izbolj{ano in vitro odpornost proti obrabi, v primerjavi z zobno protezo iz akrilne smole, zato n...

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Section: Introductionmentioning

confidence: 99%

Synthesis of PMMA/ZnO nanoparticles composite used for resin teeth

Popović¹,

Bobovnik²,

Bolka³

et al. 2017

Mater. Tehnol.

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“…Chewing efficiency is only weakly correlated with maximum occlusal force in the so-called best biting position. 17,43,44 In addition, direct support by the tongue force might ensure denture stability in the opening phase by counteracting the lifting of the mandibular denture due to its being glued to the maxillary denture by food as well as by efficient bilateral food distribution on the occlusal surfaces of the teeth, as also in terms of support during bilateral biting of food. Additionally, brain activity is associated with tongue movements 45,46 and enhanced by the functional improvement in complete dentures.…”

Section: Discussionmentioning

confidence: 99%

Relevance of Tongue Force on Mandibular Denture Stabilization during Mastication

Żmudzki

Chladek

Krawczyk

2017

Journal of Prosthodontics

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Despite the lack of substantial improvement in stability with the addition of tongue forces, tongue action that contributes to a slight reduction in sliding may help reduce common frictional trauma resulting from cyclic movement during chewing. The beneficial impact of tongue force shown in earlier work under conditions of complete adherence of dentures to the foundation indicates a benefit of using adhesives.

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“…El mal estado protésico conlleva a una disminución de la eficacia masticatoria, alteración de la fuerza oclusal, fatiga de los músculos masticatorios y un desplazamiento mandibular; las fracturas pueden presentarse debido a una sobrecarga oclusal en las zonas de concentración de stress, por la pérdida de la oclusión balanceada bilateral o por defectos en la fabricación de las prótesis (3,4,6,9,10,11).…”

Section: Introductionunclassified

Estado De Conservación De Prótesis Totales De Pacientes De Una Clínica Dental Universitaria en Ecuador

Ordoñez¹,

Dávila²,

Ortiz³

et al. 2018

EOC

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Objetivos: Analizar el estado de las prótesis totales removibles en una muestra de pacientes edéntulos bimaxilares, atendidos en la Facultad de Odontología de la Universidad de Cuenca en el periodo 2012-2015. Material y Métodos: estudio descriptivo de corte transversal, que se realizó en 70 pacientes que consultaron y recibieron tratamiento. Se realizó un análisis de los siguientes aspectos: oclusión balanceada bilateral, dimensión vertical oclusal, pérdida de dientes, fracturas, desgaste y año de realización de la prótesis, por medio de un cuestionario y un examen clínico elaborados para el estudio. Resultados: El 97,1% de pacientes presentan alguna condición afectada en su prótesis, el desgaste fue la alteración de mayor frecuencia, con 57,1%, sin embargo la oclusión balanceada bilateral correcta fue, 86%; dimensión vertical correcta, 76%; no hubo pérdida de dientes protésicos en, 90%; y ausencia de fracturas, 84%. Conclusiones: el estado protésico de los pacientes estudiados fue malo, al presentar al menos una alteración en una de sus características, de los cuales, la mayor frecuencia fueron pacientes mujeres, mayores a 45 años y con dos años de haberse realizado sus prótesis

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The influence of vertical dimension of occlusion changes on the electroencephalograms of complete denture wearers

Abstract: Psychological condition and occlusal force were influenced by immediate changes in the VDO of the complete denture.

Cited by 17 publications

References 21 publications

Synthesis of PMMA/ZnO nanoparticles composite used for resin teeth

Synthesis of PMMA/ZnO nanoparticles composite used for resin teeth

Relevance of Tongue Force on Mandibular Denture Stabilization during Mastication

Estado De Conservación De Prótesis Totales De Pacientes De Una Clínica Dental Universitaria en Ecuador

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