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Mastication is the very first step in digestion which facilitates digestion by grinding the food. Masticatory efficiency is regulated by a variety of factors such as health status of periodontium, occlusal contacts, oral musculature and bite force.METHODSA controlled parallel design interventional study was conducted. A total of 40 subjects (40-70 years) attending the Out-Patient Department of Saveetha Dental College and Hospitals, (SIMATS), Chennai, were recruited for the study. Group A or Test group consisted of patients with chronic periodontitis and Group B or Control group had patients with healthy periodontium. Using pre-weighted chewing gum which tend to change colour on mastication, Test and Control groups were asked to masticate for 20 chewing cycles. The chewing gums were then weighed again using the laboratory analytical balance. The above procedure was carried over at baseline, immediate, 1-week and 1-month post-periodontal therapy for every patient belonging to the Test group. The periodontal therapies that were performed were scaling, root planing and flap surgery. The masticatory efficiency was evaluated by comparing the mass of the chewing gum between the Test group and Control group and between each interval within the test group.
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BACKGROUND: There is no mature computer-aided design and manufacturing system for the preparation of removable partial denture in China so far. There is no report involving large sample size. Most of the existing studies only investigated the wear effect of a few cases, and there is a need to accumulate and enrich clinical data. OBJECTIVE: To explore the application value of intraoral scanning and 3D printing in the manufacture of removable partial dentures for patients. METHODS: Sixty-three patients with Kennedy class I dentition defect who received treatment in the Shanghai Ninth People’s Hospital, Shanghai JiaoTong University School of Medicine, China were included in this study. These patients consisted of 29 males and 34 females and were aged 44-63 years. In the study group, 23 patients were treated with denture scaffolds by intraoral scanning and three-dimensional printing, while in the control group, 40 patients were treated with denture scaffolds by traditional impression. The wear effect was compared between two groups after repair. The masticatory efficiency was compared between two groups before and 6, 12 and 24 months after repair. At the last follow-up, patients' satisfaction and complications were compared between the study and control groups. This study was approved by Shanghai Ninth People’s Hospital, Shanghai JiaoTong University School of Medicine (approval No. TJBDYY-2014-13-R1) in March, 2014. RESULTS AND CONCLUSION: The fitness (96% vs. 70%), retention (83% vs. 58%) and stability index (83% vs. 53%) of the study group were significantly higher than those of the control group (all P 0.05). At 12 and 24 months after repair, the masticatory efficiency in the study group was significantly higher than that in the control group (P 0.05). These results suggest that intraoral scanning and 3D printing could obtain a more accurate stent model in the manufacture of partial dentures compared with traditional impression, thereby has a higher application value.
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In elderly patients with few remaining teeth, overdenture is a good treatment option. Roots beneath the denture protect the alveolar ridge, offer proprioception and improve retention, stability and masticatory efficiency of dentures. Customization of attachments available is a viable alternative for some patients in which prefabricated attachments cannot be placed or in which cost is a factor; to improve the final outcome of the treatment. Due to competitive commercialization, implant treatment has become the norm in current dentistry and the concept of tooth supported overdentures has eclipsed, but with proper case selection, thorough treatment planning and modifications in the denture such as customization of attachments, amalgam stops, cross-linked teeth, and metallic mesh can be applied to prolong the longevity and success of the attachment overdenture prosthesis.
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Objetivo: evaluar la dureza de diferentes grupos de alimentos a la masticación. Métodos: se realizó un estudio descriptivo in vitro, en el que se evaluó la dureza de diferentes golosinas, chicharrón y carne bovina. Para ello se utilizó un texturómetro EZ-S Shimadzu. El análisis estadístico de los datos obtenidos fue realizado de manera individual utilizando las pruebas estadísticas Shapiro Wilk, Kruskal-Wallis y la de comparación de Mann Whitney. Resultados: de los grupos de alimentos estudiados, presentó una alta dureza a la masticabilidad la golosina Coffe Deligth® (dulce de café duro) con la mayor fuerza requerida de 268,25 N, seguida de otra golosina Bon Bon Bum® (chupeta) con un valor de 179,5 N y luego las mentas (dulce de menta duro) con 165,25 N. En el caso de la carne bovina y las rosquillas horneadas se encuentraron valores más bajos. Conclusiones: debido a las elevadas fuerzas que hay que aplicar para lograr la fracturabilidad y masticabilidad de los alimentos de alta dureza, el consumo de estos es un eventual factor de riesgo para las restauraciones dentales y para los mismos dientes, con lo que se puede inducir a fracturas en los materiales restauradores o en los propios órganos dentarios(AU)
Objective: evaluate the hardness of various food groups for mastication. Methods: an in vitro descriptive study was conducted to evaluate the hardness of various tidbits, fried pork rinds and beef using the texture meter EZ-S Shimadzu. Statistical analysis of the data obtained was conducted on an individual basis with Shapiro Wilk and Kruskal-Wallis statistical tests, and Mann Whitney comparison test. Results: of the food groups studied, the ones standing out for their hardness were the tidbit Coffee Delight® (hard coffee candy) with 268.25 N, followed by another tidbit, Bon Bon Bum® (lollipop) with 179.5 N and mints (hard mint candy) with 165.25 N. Beef and baked donuts exhibited lower values. Conclusions: due to the intense force that must be applied to fracture and grind very hard food, its consumption constitutes a risk factor for natural teeth and dental restorations alike, since fractures may occur in restorative materials and dental organs(AU)
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Humans , Bite Force , Eating , Hardness , Epidemiology, Descriptive , Data Interpretation, StatisticalABSTRACT
Objective:To study the maximum volume of oral cavity (MVOC) of the young adults with normal occlusion and to explore the correlation of MOVC with the height,weight,mouth opening degree and masticatory efficiency.Methods:100 volunteers with normal occlusion(50 for each sex) were enrolled.MVOC was measured by the maximum water capacity method,the height,weight,degree of mouth opening and masticatory efficiency value of the subjects were measured.Results:The average values of MVOC of the male and female were (117.63±15.31) ml and (92.08±14.06) ml respectively(P<0.01).MVOC was positively correlation with the height(r=0.67,P<0.01),weight(r=0.63,P<0.01),degree of mouth opening(r=0.47,P<0.01) and masticatory efficiency(r=0.45,P<0.01).Conclusion:MVOC is moderate-positively correlated and low-positively correlated with mouth opening degree and masticatory efficiency.
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Objective:To compare the masticatory efficiency of long-centric,semi-anatomical and cuspless occlusal complete den-tures.Methods:60 cases with flat or depressed residual ridges were randomly divided into 3 groups(n =20)and treated with long-centric,semi-anatomical and cuspless occlusal complete dentures,respectively.The masticatory efficiency was compared among 3 groups in different period(1,2,3 and 6 month)after wearing the dentures.SPSS 22.0 software package was used for data analysis. Results:There was no significant difference between long-centric occlusal and semi-anatomaical occlusal complete dentures(P >0.05)in 30 s chewing and for 40 times'chewing.The masticatory efficiency of the long-centric pattern was significantly higher than that of the cuspless pattern(P <0.05).Conclusion:Long centric occlusal complete denture can achieve satisfactory masticatory effi-ciency for edentulous patients with flat or depressed residual ridges.
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Objective To observe the effect of magnetic attachments application on oral denture restoration .Methods A to-tal of 50 patients with overdenture restoration treatment in this department from April 2012 to April 2014 were enrolled .Abutment tooth were given magnetic attachments restoration after preparations .The masticatory efficiency ,patient satisfaction and post-resto-ration complication were observed and recorded .Results The immediate masticatory efficiency after magnetic attachments restora-tion (0 .65 ± 0 .09) was significant higher than that before restoration(0 .22 ± 0 .04) ,t= 20 .812 ,P 0 .05) .There were 49 cases of immediate satisfaction and 1 case of satisfactory after restoration ,the patient satisfaction rate was 100% ,it was significant higher than that of before restoration(46% ) ,χ2 = 31 .815 ,P< 0 .05 .There were 45 ca-ses of satisfaction and 5 case of satisfactory after restoration ,the patient satisfaction rate was 100% ,it was significant higher than that of before restoration (χ2 = 31 .815 ,P< 0 .05) .Conclusion The masticatory efficiency could be improved significantly by mag-netic attachments to restore denture depletion or dentition defect ,compare with traditional denture ,it can significant shorten adapt time for patients ,and it can enhance patient satisfaction .It has wide prospect for future clinical application .
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Objective:To evaluate the subjective feeling and the objective chewing effect of the patients with the prosthesis made for upper jaw defect by altered cast impression technique.Methods:A self-control experiment was conducted for 30 patients with the pros-thesis made for upper jaw defect by specific tray impression technique and altered cast impression technique respectively.As soon as the impression was finished,the patients were required to finish 2 questionnaires,one was about their self-comfortable sensation and the other one was the STAI(State-Trait Anxiety Inventory)about their feeling of anxiety.Then the chewing-effect was tested.Data were analysed by SPSS 20.0 software (T-test and Rank-sum test).Results:Most prosthesis made by altered cast impression technique showed increased masticatory function(P <0.05).The subjective-felling evaluation indicated that the altered cast impression technique was more comfortable but there was no difference between the 2 methods in the whole course of the impression(P =0.051).STAI score showed that the patients suffered lower anxiety with altered cast impression.Conclusion:The altered cast impression technique can en-hance masticatory efficiency and increase the satisfaction of patients for preparation of the posthesis for upper jaw defect.
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<p><b>OBJECTIVE</b>This study was performed to investigate the electromyographic (EMG) activity of the masseter muscle and the anterior temporalis muscle, as well as the masticatory efficiency after insertion of the dentures in edentulous individuals whose maxillomandibular horizontal relationship records were obtained with three different methods.</p><p><b>METHODS</b>Ten edentulous individuals were enrolled in this study. Three types of complete dentures for these 10 edentulous patients were made according to their different maxillomandibular horizontal relationship records. The maxillomandibular horizontal relationship of complete dentures was recorded by three methods. In the first method (A), the maxillomandibular horizontal relationship was determined at the gothic arch tracing apex. In the second method (B), the relationship was 1 mm anterior to the tracing apex with the gothic arch. In the last method (C), the horizontal jaw relation was recorded by natural chewing. The muscular activities of the three complete dentures were examined by EMG. The masticatory efficiency was evaluated based on the absorbance. The differences among the dentures were statistically analyzed with SPSS 17.0.</p><p><b>RESULTS</b>The muscular activities of dentures B and C were much higher than that of denture A during clenching in the center occlusion and during chewing (P<0.05). The highest asymmetry index was found indenture C, which was significantly higher than those of dentures A and B (P<0.05). A statistically significant increase in the absorbance was observed between dentures B and C (P<0.05); otherwise, no statistically significant differences were observed (P>0.05) between B and C.</p><p><b>CONCLUSIONS</b>Given the limitations of this experimental design, in edentulous individuals the maxillomandibular horizontal relationship recorded at 1 mm anterior to the tracing apex with the gothic arch can improve the function of masticatory muscles and strengthen masticatory performance.</p>
Subject(s)
Humans , Dental Occlusion, Centric , Denture, Complete , Electromyography , Mastication , Mouth, Edentulous , Temporal MuscleABSTRACT
23 cases were treated with immediate full denture.The second base-remodeling or re-prosthodontic treatment was given 3 months later based on the oral condition.Masticatory efficiency (ME)was measured at each stage.About 30% patients participated in the second base-remodeling procedure with ME of 52.63%.
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When wearing complete dentures, patients want to function naturally within a physiologically stable range. To do this, recovery of esthetics, biologically stable arrangement and contour, and occlusal contacts with denture stability are necessary. In this case report, a complete denture patient of adverse conditions was presented. To increase stability of the dentures, functional impression was made by border molding using the neutral zone. The dentures were checked for physiological centric relations and stable occlusion. The clinical results showed satisfactory results on function and esthetics.
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Humans , Centric Relation , Denture Retention , Denture, Complete , Dentures , Esthetics , FungiABSTRACT
Rehabilitation of edentulous patients has been a constant concern in dentistry. Several studies have reported a reduction in the masticatory function in these patients. Osseointegrated implants have been used in order to obtain better masticatory efficiency, but more studies are needed to confirm these results. Aim: To evaluate the masticatory function of patients with conventional dentures and implant-supported dentures. Methods: A double-blinded controlled clinical study was conducted. The sample was composed of 60 patients divided into three groups: G1 with 20 patients with conventional upper (maxillary) and lower (mandibular) complete dentures, G2 with 20 patients with mandibular overdentures and upper (maxillary) complete dentures, and G3 with 20 patients with lower fixed implant-supported complete dentures (protocol). Objective data were collected through the masticatory efficiency test performed by the colorimetric method with the beads, in which capsules of a synthetic material enclosing fuchsine-containing granules were used. Results: A statistically significant difference was found for masticatory efficiency between groups G1 and G2 (pd"0.05) and between G1 and G3 (pd"0.05), and there was no statistically significant difference between G2 and G3 (pe"0.05). Conclusions: The results suggest that placement of osseointegrated implants in complete denture wearers improves their masticatory efficiency.
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Humans , Male , Female , Mouth, Edentulous , Denture, Complete , MasticationABSTRACT
Aim: The purpose of the present study was to evaluate the possible association between the oral stereognostic ability and masticatory efficiency at the time of denture insertion and after 6 months in complete denture wearers. Methods: Sixty edentulous patients were selected. The study was conducted in two parts. First, on the day of denture fit-in oral stereognostic ability test was conducted,followed by masticatory efficiency was carried out. The patients were recalled for check up after 6months and the same test was performed again. Data were tabulated and analyzed statistically by paired t-test and Pearsons correlation coefficient. Results: There was weak correlation between oral stereognosis and masticatory efficiency. Many opinions have been presented in the literature in the past regarding oral stereognosis. The issue whether oral stereognosis also helps inpatients adaptation towards complete denture prosthesis is still ambiguous. No consensus has been reached. This study is further an attempt to understand the basic physiology of oral stereognosis and whether there is any possible relation between oral stereognosis and masticatory efficiency.Conclusions: Within the limitation of this study, it can be concluded that oral stereognostic ability improves with time, which might be due to adaptation to the denture. As adaptation towardsdenture improves masticatory efficiency improves as well. This study showed that there might bea weak association between oral stereognosis and masticatory efficiency.
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Humans , Middle Aged , Denture, Complete , Mastication/physiology , Mouth/physiology , Stereognosis/physiology , Mouth Rehabilitation , Mouth, Edentulous/rehabilitation , Time FactorsABSTRACT
A variety of functional tooth contact patterns exist in population of young adult patients.The purpose of the present study is to find the relationship between different lateral tooth contact patterns and dental morphology and their effect on masticatory efficiency. Forty young dentulous subjects were selected and their impression with irreversible hydrocolloid was made. Polyvinyl silicone bite registration paste was used to record lateral tooth contact patterns in functional range of mandibular movement. Overjet and overbite including mesiodistal relation of tooth recoded with cast secured in the intercuspal position and masticatory efficiency was determined by calorimetric method by using raw carrot. Among all subjects 15% having canine protection, 55% group function, and 30% balance occlusion. There is positive correlation between age and masticatory efficiency [r=+0.656, p<.01] and negative correlation between overjet and masticatory efficiency [r=-0.409, p<0.01]. In the present study Canine protection occlusion had significantly lower mean masticatory efficiency than group function and balanced occlusion group. This signifies that the masticatory efficiency is dependent on lateral tooth contact patterns.
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The maintenance of masticatory function is especially important for patients wearing complete dentures due to their limitations. Thus, the bilateral balanced occlusal concept is used to achieve greater masticatory efficiency. However, a critical review of the literature reveals that there is not sufficient scientific evidence to support bilateral balanced occlusion as the most appropriate occlusal concept in complete dentures. Therefore, the aim of this study was to evaluate the masticatory efficiency in complete dentures wearers with bilateral balanced occlusion and canine guidance. A double-blinded controlled crossover clinical trial was conducted. The sample was composed by 24 edentulous patients who wore sets of complete dentures with both occlusal concepts during equal periods of 3 months. Objective data were collected through the masticatory efficiency test performed by the colorimetric method with the beads, in which capsules of a synthetic material enclosing fuchsine-containing granules were used. Subjective data were recorded by patient's ratings of their chewing function. No significant statistical difference was found for masticatory efficiency (p=0.095) between the two occlusal concepts studied. The results suggest that bilateral balanced occlusion does not improve the masticatory efficiency in complete denture wearers.
A manutenção da função mastigatória tem importância especial em pacientes portadores de prótese total devido às limitações inerentes a esse tipo de prótese. Nesse contexto, a oclusão balanceada bilateral (OBB) é empregada com o intuito de obter-se uma maior eficiência mastigatória. Entretanto, analisando-se a literatura criticamente, observa-se que não existem evidências científicas suficientes que suportem a aplicação da OBB como conceito oclusal ideal em prótese total (PT). Assim, o presente trabalho teve o objetivo de verificar se pacientes portadores de PT dupla com OBB apresentam maior eficiência e capacidade mastigatória que aqueles com desoclusão com guia canino (DGC). Com esse intuito, realizou-se um ensaio clínico controlado duplo-cego do tipo crossover. A amostra foi composta de 24 pacientes portadores de prótese total dupla, onde todos fizeram uso de ambos os conceitos oclusais por períodos iguais de 3 meses. A avaliação da eficiência mastigatória foi realizada através do método colorimétrico com o uso de cápsulas mastigatórias. Não se encontrou diferença estatística significativa para a eficiência (p=0,0952) entre os dois conceitos oclusais estudados. Dessa forma, pode-se concluir que usuários de PT dupla com OBB não apresentam maior eficiência mastigatória que aqueles com DGC.
Subject(s)
Aged , Humans , Middle Aged , Dental Occlusion , Denture Design , Denture, Complete , Jaw, Edentulous/rehabilitation , Mastication/physiology , Centric Relation , Cross-Over Studies , Cuspid , Dental Occlusion, Balanced , Dental Occlusion, Centric , Dental Restoration Wear , Double-Blind Method , Dental Arch/anatomy & histology , Functional Laterality , Treatment OutcomeABSTRACT
Objective:To explore a new method and it's clinical efficiency of porcelain technique on severe tooth wear and dentition defect.Methods:The transitional occlusal pad restored the vertical dimension and centric relation.decreased TMD symptoms.The porcelain technique was used to reconstruct the occlusal relationship,their prognoses and patients' satisfactory were recorded.Results:45 patients suffered from serious dental abrasion,whose clinical symptoms got much better and masticatory efficiency improved significantly.Conclusion:Porcelain is an aesthetic and comfortable technique to improve patients' masticatory efficiency significantly which is similar to real tooth.
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Objective:To make a within-subject comparison of masticatory function and pattern between complete denture(CD)and implant-supported overdneture(IOD).Methods: Three edentulous patients volunteered to take part in this test.Each of the patients was rehabilitated with lower CD first and lower IOD later,and with the upper denture of CD.The masticatory efficiency,mandibular movement trace and the surface electromyograph (EMG) of masseters,anterior temporlis and posterior temporlis were measured 3 month after the use of each set of the dentures.Results: With IOD,each patient increased masticatory efficiency,especially when chewing almond.The regulation of chewing cycle,centralization of end traces and occlusal slides of mandibular movement were significantly improved.The electricactivity of masseters,anterior and posterior temporlis all enhanced by means of increasing contract intensity and the rhythm of the mastication was more regular.The muscle activity pattern in two cases transformed from instable to stable,while that of the another patient changed from masseter preponderant pattern to temporlis preponderant pattern.Conclusion: Patients with IOD have a heigher masticatory efficiency,more regular mandibular movement pattern,more effective masticatory muscle contractive pattern and masticatory muscle coordinative pattern than those with CD.
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Objectives:To evaluate the effect of different teeth arrangement methods on the masticatory efficiency of complete dentures.Methods: Three complete dentures for each of ten edentulous patients were made respectively by using maxillary teeth arrangement,mandibular teeth arrangement and comprehensive teeth arrangement methods.After three months of wearing,the masticatory efficiency of the three complete dentures was tested by light absorption method,and was compared to that of dentulous subjects.Results:The masticatory stroke and masticatory efficiency in denture wearing group were fewer and weaker than those in dentulous group in either bilateral mastication or unilateral mastication. Good masticatory efficiency was gained after three months of wearing the complete dentures made by the three different teeth arrangement methods.There were no significant difference in the masticatory stroke and masticatory efficiency of complete dentures made by mandibular teeth arrangement and comprehensive teeth arrangement methods,but they were both higher than those made by maxillary teeth arrangement method.Conclusions:The complete dentures made by mandibular teeth arrangement method and comprehensive teeth arrangement method are feasible for restoration of masticatory efficiency of endentulous patients.
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Objective To evaluate the clinical effects of magnetic attachments in complete overdenture. Methods Casting method was used to fabricate Coping-Keepers for remained roots, and the patients were followed up for 6 months to check the effects of the overdentures retained with Magfit EX attachments. In the experimental group, 21 complete overdentures were made with 33 Magfit EX magnetic attachments for 18 patients. Eleven patients treated with traditional complete overdentures were selected to act as control. The retention force, aspect and comfortableness were subjectively evaluated by the patients of the both groups. Abutment status was observed and compared before and after cementation of the magnetic attachments by measuring periodontal index, including gingival index (GI), sulcus bleeding index (SBI) and bleeding on probing (BOP), etc. Masticatory function of patients in the both groups was measured at 3 time points: immediate, 3 months and 6 months after cementation. Results Patients in experimental group were more satisfied with complete overdentures made up of magnetic attachments than those in control group, especially in retention force and masticatory efficiency and aspect. Magnetic attachments can provide enough retention force for patients and greatly improved the masticatory efficiency and the abutment condition. The masticatory function was to be perfect and stable after 3-6 months. Furthermore, the mobility and periodontal index of most abutments improved after 6 months. Conclusion It is proved that magnetic attachments are effective to improve the function of complete overdentures, worthy to be used widely. It is suggested that the residual root and loosened tooth should be preserved furthest as possible in clinic.