RESUMO
OBJECTIVE: The aim of this study was to compare the mandibular movements in older people with and without temporomandibular disorder (TMD) associated with rheumatoid arthritis (RA). STUDY DESIGN: Thirty partially or completely edentulous older adults (65.33 ± 4.7 years) were assigned to 2 groups: (1) with RA and TMD and (2) without RA and TMD. Chewing movements of the jaws during mastication of the test material (Optocal) and the range of mandibular movements were evaluated by using the JT-3-D kinesiographic device before and after new removable prosthesis insertion. Multiple comparisons were made with analysis of variance (ANOVA) and the Tukey-Kramer test. RESULTS: Comparisons between the 2 groups before and after new prosthesis insertion revealed that the RA and TMD group had reduced opening angles (P < .05) during chewing. After insertion of new prostheses, both groups showed increased opening and closing angles during chewing (P < .05). The mandibular range of motion results showed that patients with RA and TMD exhibited lower aperture and laterality movements (P < .05) compared with controls before and after new prosthesis insertion. However, there was an increase in aperture, lefty laterality, and protrusion values after new prosthesis insertion in both groups. CONCLUSIONS: TMD associated with RA may impair mandibular movements. Well-fitted prostheses may improve mandibular movements in older adults, especially those with RA.
Assuntos
Artrite Reumatoide/fisiopatologia , Mandíbula/fisiopatologia , Transtornos da Articulação Temporomandibular/fisiopatologia , Idoso , Brasil , Estudos Transversais , Feminino , Humanos , Arcada Edêntula/fisiopatologia , Arcada Parcialmente Edêntula/fisiopatologia , Masculino , Mastigação/fisiologia , Amplitude de Movimento Articular/fisiologiaRESUMO
OBJECTIVES: This study investigated chewing function in elderly individuals with Alzheimer's disease (AD) and correlated chewing function with cognitive status. MATERIALS AND METHODS: Sixteen elderly individuals with mild AD (mean age 76.7 ± 6.3 years; 8 men, 8 women) and 16 age and gender-matched healthy controls (mean age 75.23 ± 4.4 years; 8 men, 8 women) were included in this study. All volunteers wore removable prostheses: 11 were totally edentulous and five were partially edentulous in each group. Chewing function was evaluated via masticatory performance (MP) using Optocal chewable test material and a sieve fractionation method. Cognitive functioning was assessed by the Mini Mental State Exam (MMSE), administered by a trained examiner. Data were analyzed by non-paired t test and Pearson's correlation with α = 0.05. RESULTS: Compared to controls, mild AD patients had decreased MP (P < 0.01) and MMSE (P = 0.01). MP showed a moderate negative correlation with MMSE (r = -0.69). CONCLUSIONS: Mild AD was associated with impaired chewing function. CLINICAL RELEVANCE: Knowledge that mild AD has an impact on chewing is important for dental professionals in decision-making related to prosthetics and general dental treatment.
Assuntos
Doença de Alzheimer/fisiopatologia , Mastigação/fisiologia , Idoso , Estudos de Casos e Controles , Estudos Transversais , Feminino , Humanos , Arcada Edêntula/fisiopatologia , Arcada Parcialmente Edêntula/fisiopatologia , MasculinoRESUMO
The relationship between type 2 diabetes oral physiology, nutritional intake and quality of life has not been fully elucidated. We assessed the impact of type 2 diabetes - exclusive or associated with hypertension with beta-blockers treatment - on oral physiology, mastication, nutrition and quality of life. This cross-sectional study was performed with 78 complete dentate subjects (15 natural teeth and six masticatory units minimum; without removable or fixed prostheses), divided into three groups: diabetics (DM) (n = 20; 45·4 ± 9·5 years), diabetics with hypertension and receiving beta-blockers treatment (DMH) (n = 19; 41·1 ± 5·1 years) and controls (n = 39; 44·5 ± 11·7 years) matched for gender, age and socioeconomic status. Blood glucose, masticatory performance, swallowing threshold, taste, food intake, stimulated and unstimulated salivary flow, pH and buffering capacity of saliva were assessed. Glycemia was higher in DM than in controls (P < 0·01). No differences were observed between DM and controls for nutrition and quality of life. Both stimulated and unstimulated salivary flow rate were lower in DMH (P < 0·01), which also presented the lowest number of teeth and masticatory units (P < 0·0001), and reduction in the number of chewing cycles (P < 0·01). Controls showed lower Decayed Missing Filled Teeth index (DMFT) scores in comparison with DMH (P = 0·021). Masticatory performance and saliva buffering capacity were similar among groups. Exclusive type 2 diabetes did not alter oral physiology, nutrition or quality of life. However, when hypertension and beta-blockers treatment were associated with diabetes, the salivary flow rate, chewing cycles and number of teeth decreased.
Assuntos
Anti-Hipertensivos/uso terapêutico , Diabetes Mellitus Tipo 2/fisiopatologia , Hipertensão/fisiopatologia , Arcada Parcialmente Edêntula/fisiopatologia , Mastigação/fisiologia , Qualidade de Vida , Saliva/metabolismo , Adulto , Anti-Hipertensivos/farmacologia , Estudos Transversais , Índice CPO , Diabetes Mellitus Tipo 2/complicações , Diabetes Mellitus Tipo 2/psicologia , Feminino , Humanos , Hipertensão/complicações , Hipertensão/psicologia , Masculino , Mastigação/efeitos dos fármacos , Pessoa de Meia-Idade , Fatores de Risco , Saliva/efeitos dos fármacos , Xerostomia/fisiopatologiaRESUMO
The main goal of prosthetic treatment is to restore masticatory function. However, insufficient evidence supports the recommendation of one specific prosthetic intervention for partially edentulous patients. Function after the use of three different prostheses by the same partially edentulous subject. Mastication was assessed in 12 subjects (mean age 62.6 ± 7.8 years) after they had used removable partial dentures (RPDs), implant-supported partial dentures (IRPDs) and implant-fixed partial dentures (IFPDs). Masticatory ability (MA) was estimated by visual analogue scale questionnaire, while the mandibular chewing motion was evaluated by kinesiographic device, representing an objective measurement of masticatory function. Data were analysed by repeated-measures anova followed by Tukey-Kramer (P < 0.05). MA improved after IRPD and IFPD use (P < 0.05). Opening, closing and total cycle time duration were reduced after both IRPD and IFPD use (P < 0.05), irrespectively the implant prosthesis type. IFPDs and IRPDs restore the masticatory function of partially edentulous patients better than RPDs.
Assuntos
Prótese Dentária Fixada por Implante , Prótese Parcial Fixa , Prótese Parcial Removível , Arcada Parcialmente Edêntula/fisiopatologia , Mandíbula/fisiopatologia , Mastigação/fisiologia , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Arcada Parcialmente Edêntula/reabilitação , Cinesiologia Aplicada , Masculino , Pessoa de Meia-Idade , Inquéritos e Questionários , Resultado do TratamentoRESUMO
OBJECTIVES: This study measured swallowing threshold parameters and nutrient intake in partially dentate subjects rehabilitated by conventional free-end removable partial dentures (RPD) and by RPD over posterior implant retainers and ball attachments (BA). MATERIALS AND METHODS: Eight subjects (two men and six women; mean age 60.1 ± 6.6 years old) received conventional total maxillary dentures and free-end RPD in the mandible. Two months after denture insertion, swallowing threshold and nutrient intake assessments occurred, which included an evaluation of the number of masticatory cycles and medium particle size (X50) of a silicone test material (Optocal). A 3-day food diary verified nutrient intake based on a standard Brazilian Food Composition Table. Then, osseointegrated implants were placed bilaterally in the mandibular first molar region, followed by BA, which was fitted in the RPD bases after healing. After 2 months of the RPD over implants and BA use, variables were again assessed. Wilcoxon signed rank tests evaluated the data (P < 0.05). RESULTS: Masticatory cycles did not differ (P > 0.05); however, subjects showed decreased X50 values at the swallowing moment (P = 0.008) and increased daily energy (P = 0.008), carbohydrate (P = 0.016), protein (P = 0.023), calcium (P = 0.008), fiber (P = 0.016), and iron (P = 0.016) intake with RPD implants and BA inserts. No differences were found in fat consumption (P > 0.05). CONCLUSION: Implants and BA retainers over a free-end RPD resulted in smaller swallowed median particle size and improved nutrient intake.
Assuntos
Deglutição/fisiologia , Prótese Dentária Fixada por Implante , Prótese Total , Prótese Parcial Removível , Ingestão de Energia , Arcada Parcialmente Edêntula/fisiopatologia , Arcada Parcialmente Edêntula/reabilitação , Mastigação/fisiologia , Planejamento de Dentadura , Feminino , Humanos , Masculino , Mandíbula/fisiologia , Mandíbula/cirurgia , Pessoa de Meia-Idade , Osseointegração , Resultado do TratamentoRESUMO
UNLABELLED: Removable partial denture prostheses are still being used for anatomic, medical and economic reasons. However, the impact on chewing parameters is poorly described. OBJECTIVES: The objective of this study was to estimate the impact of removable partial denture prosthesis on masticatory parameters. MATERIAL AND METHODS: Nineteen removable partial denture prosthesis (RPDP) wearers participated in the study. Among them, 10 subjects were Kennedy Class III partially edentulous and 9 with posterior edentulism (Class I). All presented a complete and full dentate opposing arch. The subjects chewed samples of carrots and peanuts with and without their prosthesis. The granulometry of the expectorated boluses from carrot and peanuts was characterized by median particle size (D50), determined at the natural point of swallowing. Number of chewing cycles (CC), chewing time (CT) and chewing frequency (CF=CC/CT) were video recorded. RESULTS: With RPDP, the mean D50 values for carrot and peanuts were lower [Repeated Model Procedures (RMP), F=15, p<0.001] regardless of the type of Kennedy Class. For each food, mean CC, CT and CF values recorded decreased (RMP, F=18, F=9, and F=20 respectively, p<0.01). With or without RPD, the boluses' granulometry values were above the masticatory normative index (MNI) determined as 4,000 µm. CONCLUSION: RPDP rehabilitation improves the ability to reduce the bolus particle size, but does not reestablish fully the masticatory function. CLINICAL RELEVANCE: This study encourages the clinical improvement of oral rehabilitation procedure.
Assuntos
Prótese Parcial Removível , Mastigação/fisiologia , Adulto , Idoso , Feminino , Humanos , Arcada Parcialmente Edêntula/fisiopatologia , Arcada Parcialmente Edêntula/reabilitação , Masculino , Pessoa de Meia-Idade , Tamanho da Partícula , Estudos Prospectivos , Fatores de Tempo , Adulto JovemRESUMO
Removable partial denture prostheses are still being used for anatomic, medical and economic reasons. However, the impact on chewing parameters is poorly described. OBJECTIVES: The objective of this study was to estimate the impact of removable partial denture prosthesis on masticatory parameters. MATERIAL AND METHODS: Nineteen removable partial denture prosthesis (RPDP) wearers participated in the study. Among them, 10 subjects were Kennedy Class III partially edentulous and 9 with posterior edentulism (Class I). All presented a complete and full dentate opposing arch. The subjects chewed samples of carrots and peanuts with and without their prosthesis. The granulometry of the expectorated boluses from carrot and peanuts was characterized by median particle size (D50), determined at the natural point of swallowing. Number of chewing cycles (CC), chewing time (CT) and chewing frequency (CF=CC/CT) were video recorded. RESULTS: With RPDP, the mean D50 values for carrot and peanuts were lower [Repeated Model Procedures (RMP), F=15, p<0.001] regardless of the type of Kennedy Class. For each food, mean CC, CT and CF values recorded decreased (RMP, F=18, F=9, and F=20 respectively, p<0.01). With or without RPD, the boluses' granulometry values were above the masticatory normative index (MNI) determined as 4,000 µm. CONCLUSION: RPDP rehabilitation improves the ability to reduce the bolus particle size, but does not reestablish fully the masticatory function. CLINICAL RELEVANCE: This study encourages the clinical improvement of oral rehabilitation procedure. .
Assuntos
Humanos , Masculino , Feminino , Adulto , Pessoa de Meia-Idade , Idoso , Adulto Jovem , Prótese Parcial Removível , Mastigação/fisiologia , Arcada Parcialmente Edêntula/fisiopatologia , Arcada Parcialmente Edêntula/reabilitação , Tamanho da Partícula , Estudos Prospectivos , Fatores de TempoRESUMO
PURPOSE: The aim of this cross-sectional study was to investigate the relationship between body fat and masticatory function. MATERIALS AND METHODS: One hundred dentate and partially edentulous participants (33 male; mean age, 39.7 ± 16.6 years) were selected. Body fat was established through body mass index (BMI). Masticatory function was evaluated by quantifying occlusal pairs and determining masticatory efficiency and swallowing threshold with the sieving method. During the swallowing threshold test, chewing rate was registered. Masticatory ability was also evaluated with a 5-point Likert scale questionnaire. Data were analyzed with Spearman and chi-square tests, as well as binary logistic regression analysis for the presence of increased BMI (α= 0.05). RESULTS: Age (rho = 0.517), occlusal pairs (chi-square = 26.353), masticatory efficiency (chi-square = 30.935), masticatory ability (chi-square = 25.132; p < 0.001), and swallowing threshold (chi-square = 8.730; p < 0.005) were related to BMI. Age (odds ratio, OR = 1.048, 95% CI = 1.008 to 1.089) and lower masticatory efficiency (OR = 4.792, 95% CI = 1.419 to 16.183) were predictive of increased body fat (p < 0.05). Gender (chi-square = 0.402, p= 0.526) and chewing rate (rho =-0.158, p= 0.117) were not related to BMI. CONCLUSIONS: These results suggest that people with lower masticatory efficiency may be at risk for increased body fat.
Assuntos
Tecido Adiposo/anatomia & histologia , Mastigação/fisiologia , Adulto , Animais , Índice de Massa Corporal , Pão , Estudos Transversais , Deglutição/fisiologia , Dentição , Prótese Parcial Fixa , Feminino , Frutas , Humanos , Arcada Parcialmente Edêntula/fisiopatologia , Masculino , Carne , Pessoa de Meia-Idade , Obesidade/fisiopatologia , Sobrepeso/fisiopatologia , Tamanho da Partícula , Limiar Sensorial/fisiologia , Elastômeros de Silicone/química , VerdurasRESUMO
PURPOSE: The aim of this study was to determine the influence of occlusal support length (OSL) of free-end removable partial dentures (RPDs) on masticatory function. MATERIALS AND METHODS: Twenty-three subjects (mean age: 55.2 ± 8.4 years) who were edentulous in the maxilla and classified as Kennedy Class I in the mandible were selected. Subjects received new maxillary complete dentures and mandibular RPDs. Five OSL conditions were determined by RPD artificial tooth wear: full occlusal support (L1, control), OSL to first molar (L2), OSL to second premolar (L3), OSL to first premolar (L4), and absence of occlusal support (L5). Masticatory performance and efficiency were evaluated using the sieve method. Chewing rate was defined as the number of masticatory cycles per minute. Bolus selection opportunities and bolus breakage function were evaluated using the one-chew method. Qualitative and quantitative measurements of masticatory cycle patterns were recorded kinesiographically. Data were analyzed using repeated-measures analysis of variance and Friedman and Fisher exact tests (α = .05). RESULTS: Masticatory performance and efficiency decreased (P < .05) from L1 (5.46 ± 0.64 mm and 51.21% ± 19.44%, respectively) to L5 (6.24 ± 0.44 mm and 24.50% ± 15.98%, respectively). Chewing rate was higher for L4 than L1 (P < .05). Bolus selection chances and bolus breakage function decreased as OSL was reduced (P < .05); however, there were no differences in masticatory cycle pattern among the OSL conditions (P > .05). CONCLUSION: Reduction of OSL altered masticatory function, thereby decreasing masticatory performance and efficiency resulting from a lower capacity to select and break down food.
Assuntos
Planejamento de Dentadura , Prótese Parcial Removível , Arcada Parcialmente Edêntula/fisiopatologia , Mastigação , Oclusão Dentária , Desgaste de Restauração Dentária , Análise do Estresse Dentário , Prótese Total Superior , Feminino , Humanos , Masculino , Mandíbula , Pessoa de Meia-IdadeRESUMO
Mastication was evaluated in subjects presenting extremely shortened dental arches (ESDAs) rehabilitated with mandibular free-end removable partial dentures (RPDs). Subjects were divided into four groups (n = 10): those with a complete dentition, those with ESDAs, and those with ESDAs who were rehabilitated with an RPD, who were evaluated both with and without their prostheses. Mastication was measured through masticatory performance, time, and ability. RPD wearers showed higher masticatory performance (P < .01) and ability (P < .001) and lower masticatory time (P < .001) than when not wearing their prostheses as well as ESDA subjects who had not received RPD therapy. Those with a complete dentition showed the best results (P < .001). It can be suggested that RPDs improve mastication in ESDA subjects but without achieving normal mastication levels.
Assuntos
Prótese Parcial Removível , Arcada Parcialmente Edêntula/fisiopatologia , Mastigação , Adulto , Análise de Variância , Humanos , Arcada Parcialmente Edêntula/reabilitação , Masculino , Mandíbula , AutorrelatoRESUMO
Dental absence interferes in the physiological functioning of the masticatory system, promoting occlusal and functional alterations. The purpose of this study was to verify maximal bite force and maximal bite force correlated with electromyographic activity in 14 partially edentulous and 14 dentate individuals. Bite force in right and left molar and incisor regions were registered using a dynamometer with capacity of up to 1000N, adapted for oral conditions and at the same time electromyography was performed using Myosystem-Br1 with electrodes positioned on right and left masseter and temporalis muscles, and one reference electrode on the frontal bone. The highest value out of three recordings was considered the individual's maximal bite force. Statistical analysis of the bite force data was performed by means of t-test and Pearson's bivariate correlation test was used for the analysis between bite and electromyographic activity using SPSS 12.0 software. Dentate individuals showed greater maximal bite force in the three regions. Correlations between electromyographic activity and bite force in the dentate group obtained positive coefficients for every muscle in the right molar region, for the left temporalis in the left molar region, and for every muscle in the incisive region. For the partially edentulous group, only the left temporalis muscle presented a positive correlation in the right molar region, there was positive correlation for the right masseter and right and left temporalis in the left molar region, and, in the incisive region, every muscle presented negative correlation. These data evidence the strong influence of dental loss over the maximal bite force and small correlation between bite force and electromyographic activity.
Assuntos
Força de Mordida , Eletromiografia/instrumentação , Arcada Parcialmente Edêntula/fisiopatologia , Músculo Masseter/fisiopatologia , Dente Molar/fisiopatologia , Músculo Temporal/fisiopatologia , Adulto , Feminino , Humanos , Masculino , SoftwareRESUMO
Occlusion is a predisposing factor for Temporomandibular Dysfunctions (TMD) of the joint, whose first sign and/or symptom is usually joint sound. To verify the effect of occlusion on joint sounds, temporomandibular joints (TMJ) were analyzed in 78 asymptomatic individuals with various dental conditions. Electrosonography was used to determine the intensity of the vibration in the temporomandibular joint (TMJ) on opening and closing the mouth. Transducers (piezoelectric accelerometer) were placed on the right and left joints. Results were tabled and analyzed using the Kruskal-Wallis test (a=0.05). It was concluded that TMJ vibration in partly edentulous individuals from Kennedy classes I, II and III is statistically higher than in dentate and fully edentulous subjects.
Assuntos
Oclusão Dentária , Articulação Temporomandibular/fisiopatologia , Aceleração , Adolescente , Adulto , Fatores Etários , Idoso , Idoso de 80 Anos ou mais , Criança , Eletrodiagnóstico/instrumentação , Eletrodiagnóstico/métodos , Humanos , Arcada Edêntula/fisiopatologia , Arcada Parcialmente Edêntula/fisiopatologia , Pessoa de Meia-Idade , Amplitude de Movimento Articular/fisiologia , Fatores de Risco , Som , Espectrografia do Som/instrumentação , Espectrografia do Som/métodos , Transdutores , Vibração , Adulto JovemAssuntos
Humanos , Masculino , Adolescente , Adulto , Criança , Pessoa de Meia-Idade , Feminino , Articulação Temporomandibular/fisiopatologia , Oclusão Dentária , Arcada Parcialmente Edêntula/fisiopatologia , Eletrodiagnóstico/instrumentação , Eletrodiagnóstico/métodos , Amplitude de Movimento Articular , Fatores de Risco , Espectrografia do Som , Som , Fatores de Tempo , Transdutores , VibraçãoRESUMO
This study had as objective to analyze with computerized electromyography the masseter muscles bilaterally in twenty individuals with temporomandibular joint dysfunction (DTM), being: the group I consisting of ten individuals with complete dentition and group II constituted by ten individuals with posterior dental absences; comparing nine clinical activities: rest before and after exercises, maximum habitual intercuspation (MIH), right and left laterality, forced centric occlusion, protrusion, bilateral molar bite and chewing. It was utilized the Electromyography K6I-Myotronics, with eight canals and surface silver electrodes. By means of the results analysis, we verified significant differences between the groups (p < 0.01), being group I, presented greater electromyographic activity (32.98 microvolts), than the group II (22.31 microvolts), suggesting that this individuals presented low muscular activity. The interaction between the groups and the clinical activities was significant (p < 0.01), as well as between the groups, clinical activities and muscles (p < 0.05). To clarify which amongst the relative averages the clinical activities were different, calculated the critical value of Tukey, being that rest before and after exercises, MIH, right and left laterality, presented averages with similar distributions, with values below of the values of Tukey, as well as forced centric occlusion, protrusion, bilateral molar bite and chewing presented higher values than Tukey. Based on this research's data, we concluded that the electromyographical analysis of the masseter muscles in Individuals with TMD, dentulous and with dental absence showed that individuals with TMD, dentulous or not, presented elevated muscular activity in rest position and individuals with TMD, dentulous, presented higher electromyographical activity than the individuals with TMD and lacking posterior teeth.
Assuntos
Arcada Parcialmente Edêntula/complicações , Arcada Parcialmente Edêntula/fisiopatologia , Músculo Masseter/fisiopatologia , Transtornos da Articulação Temporomandibular/complicações , Transtornos da Articulação Temporomandibular/fisiopatologia , Adulto , Estudos de Casos e Controles , Oclusão Dentária , Eletromiografia , Feminino , Humanos , Masculino , Mastigação/fisiologia , Descanso/fisiologiaRESUMO
PURPOSE: The aim of this study was to investigate the changes in interocclusal distance during the pronunciation of /m/ and /s/ sounds in the Portuguese language, in partially edentulous patients before and after insertion of new dentures. MATERIALS AND METHODS: Subjects were divided into a control group consisting of 18 completely dentate patients and an experimental group consisting of 18 patients who were edentulous in the maxilla and classified as Kennedy Class I in the mandible. The experimental group had new dentures placed and the occlusal vertical dimension corrected. A magnetic jaw-tracking device measured the interocclusal distance during pronunciation of the /m/ and /s/ phonemes. Interocclusal distance evaluations were carried out in a single session for the control group. In the experimental group, the measurements were carried out before insertion of new dentures; immediately after insertion; and after 6 and 24 hours; 2 days; 1 and 2 weeks; 1, 2, 3, and 6 months; and 1 year. RESULTS: Comparison between groups revealed significant difference in interocclusal distance for the /m/ sound both before and after insertion of dentures up to 2 months. For the /s/ phoneme, there was no difference between the groups before prosthesis insertion, or after 3, 6, and 12 months of prosthesis use. There were significant differences for the /m/ sound only at 6 and 12 months after new denture insertion, and for the /s/ sound at all periods evaluated. CONCLUSION: Insertion of new dentures, with the vertical dimension corrected, changes the interocclusal distance of speech during phonation of /m/ and /s/ sounds.
Assuntos
Prótese Total , Prótese Parcial , Fala/fisiologia , Dimensão Vertical , Adulto , Idoso , Planejamento de Dentadura , Feminino , Seguimentos , Humanos , Arcada Edêntula/fisiopatologia , Arcada Edêntula/reabilitação , Arcada Parcialmente Edêntula/fisiopatologia , Arcada Parcialmente Edêntula/reabilitação , Masculino , Mandíbula/fisiologia , Pessoa de Meia-Idade , Movimento , Fonética , PortugalRESUMO
The mandible and maxilla of two edentulous women, treated during 25 weeks with oral pamidronate, were monitored by peripheral quantitative tomography (pQCT). Whole bone volumetric mineral density failed to show meaningful variations after treatment. However, an analysis of separated cortical and medullar areas disclosed focal bone loss at the right mandible cortex of patient #1 and at the left maxilla cortex of patient #2. These and other bone sub-regions were further studied by clustering the internal sites with a different degree of bone mineral density, resorting to the mineral threshold analysis provided by the system. Where bone loss was detected, it corresponded to increased loss of the most osteopenic sites, while medium and high-density portions tended to remain unchanged within the region. There were no significant variations in all other regions, or alternatively, minor losses at osteopenic sites were compensated by an increase at high-density portions. Hence, the pQCT system allowed monitoring volumetric bone mineral density at particular sites of interest, discriminating variations at portions with a dissimilar degree of bone volume. Further studies should confirm whether pamidronate exerts a protective effect on sub-regions with previous medium and high degrees of bone mineralization, as suggested by our present findings.
Assuntos
Densidade Óssea/efeitos dos fármacos , Doenças Ósseas Metabólicas/tratamento farmacológico , Difosfonatos/uso terapêutico , Arcada Edêntula/fisiopatologia , Mandíbula/efeitos dos fármacos , Maxila/efeitos dos fármacos , Tomografia Computadorizada por Raios X , Desmineralização Patológica Óssea/diagnóstico por imagem , Desmineralização Patológica Óssea/tratamento farmacológico , Doenças Ósseas Metabólicas/diagnóstico por imagem , Medula Óssea/diagnóstico por imagem , Medula Óssea/efeitos dos fármacos , Calcificação Fisiológica/efeitos dos fármacos , Feminino , Humanos , Processamento de Imagem Assistida por Computador , Arcada Edêntula/diagnóstico por imagem , Arcada Parcialmente Edêntula/diagnóstico por imagem , Arcada Parcialmente Edêntula/fisiopatologia , Mandíbula/diagnóstico por imagem , Maxila/diagnóstico por imagem , Pessoa de Meia-Idade , PamidronatoAssuntos
Prótese Parcial Removível , Arcada Parcialmente Edêntula/reabilitação , Reabilitação Bucal/métodos , Força de Mordida , Dente Suporte , Oclusão Dentária , Retenção em Prótese Dentária , Análise do Estresse Dentário , Arcada Parcialmente Edêntula/fisiopatologia , Mucosa Bucal/anatomia & histologiaRESUMO
Four techniques for interocclusal registrations of centric relation based on materials or combinations of materials usually utilized were tested by means of mounting of casts for a patient with partial lower edentulousness, without a free end saddle. To ensure the correct position of centric relation a Lucia jig was utilized. The following conditions for the record of posterior section were tested: registrations with wax, wax plus zinc oxide-eugenol paste, wax plus Duralay acrylic resin, and condensation silicone (putty). The evaluation was made by the measure of vertical distance between reference points in the base of the casts and calculation of variations occurring with each material. The combinations of wax plus zinc oxide-eugenol paste and wax plus Duralay acrylic resin showed the smallest variations in centric relation position.
Assuntos
Relação Central , Materiais Dentários , Registro da Relação Maxilomandibular/instrumentação , Resinas Acrílicas/química , Análise de Variância , Articuladores Dentários , Materiais Dentários/química , Humanos , Registro da Relação Maxilomandibular/métodos , Arcada Parcialmente Edêntula/fisiopatologia , Mandíbula , Metilmetacrilatos/química , Modelos Dentários , Polivinil/química , Siloxanas/química , Dimensão Vertical , Ceras/química , Cimento de Óxido de Zinco e Eugenol/químicaRESUMO
The possible alterations caused by occlusal modifications in mandibular head volume were studied in rats by morphometric techniques. The results permitted the authors to conclude that, within the conditions of the experiments, the total volume of the mandibular head was unchanged, although alterations in the direction of growth may occur.