RESUMO
This study described the prevalence of adults with shortened dental arches (SDA) in Brazil, specifically assessing the differences of oral health-related quality of life [the prevalence and severity of oral impacts on daily performance (OIDP)] by dentition status. We analysed data from the 2010 National Survey of Oral Health in Brazil, including home interviews and oral examinations. The assessment of SDA used two alternative definitions: having 3-5 natural occlusal units (OUs) in posterior teeth or having 4 OUs in posterior teeth. Both definitions included having intact anterior region and no dental prosthesis. The analysis was weighted, and a complex sampling design was used. Negative binomial regression models assessed associations as adjusted for socio-demographic conditions and dental outcomes. A total of 9779 adults (35-44 years old) participated in the study. A non-negligible proportion had SDA: 9·9% and 3·8% for the first and second definition, respectively. Individuals with SDA (first definition) ranked higher in OIDP prevalence [count ratio (CR) 1·22; 1·09-1·36, 95% confidence interval (CI)] and severity (CR = 1·43; 1·19-1·72, 95% CI) than those with more natural teeth. This difference was not statistically significant when adjusted for socio-demographic and dental covariates: OIDP prevalence (CR = 1·04; 0·92-1·17, 95% CI) and severity (CR = 1·09; 0·91-1·30, 95% CI). Analogous results were obtained when the second definition of SDA was adopted. These findings suggest that a considerable contingent of adults may function well without dental prostheses, despite having several missing teeth. This conclusion challenges the traditional approach of replacing any missing tooth and instructs the allocation of more dental resources to preventive, diagnostic and restorative services.
Assuntos
Arco Dental/fisiopatologia , Saúde Bucal/estatística & dados numéricos , Qualidade de Vida , Adulto , Brasil/epidemiologia , Feminino , Humanos , Masculino , Modelos Estatísticos , Prevalência , Análise de RegressãoRESUMO
The aim of this study was to analyze the effect of the separation of prosthetic crowns from fixed partial dentures by means of stress gradient evaluation. Three photoelastic models were created to examine contiguous implants with varying contact between the crowns (contact point [CP], contact surface [CS], splinted [SP]). The SP group presented the best results, followed by the CS group, indicating that the use of splinted prosthetic crowns and crowns with broad surface contacts is viable when considering the stress values.
Assuntos
Coroas , Prótese Dentária Fixada por Implante , Planejamento de Dentadura , Prótese Parcial Fixa , Algoritmos , Processo Alveolar/fisiopatologia , Fenômenos Biomecânicos , Força de Mordida , Arco Dental/fisiopatologia , Planejamento de Prótese Dentária , Análise do Estresse Dentário/instrumentação , Humanos , Mandíbula/fisiopatologia , Estresse Mecânico , Propriedades de SuperfícieRESUMO
One obstacle to placing artificial posterior teeth in manufacturing complete dentures is a reduction of the space between the maxilla and the mandible. Occasionally, second molar placement is not performed, as it does not affect aesthetics, phonetics or comfort. The aim of this study was to compare the masticatory efficiency between patients wearing maxillary and mandibular complete dentures with reduced dental arches (without second molars) (WSM) and with full dental arches (FDA). Twenty subjects were divided into two groups and randomly received new complete dentures. Patients in Group 1 were given dentures WSM, and those in Group 2 were given dentures with FDA. After the post-placement visits, an initial masticatory efficiency test was performed with Optocal, an artificial test food. Fifteen days later, second molars were placed in Group 1 and removed from Group 2, and a new test was performed. Comminuted material was treated and sieved under vibration. The mean and standard deviation of masticatory efficiency with FDA were 10.4 and 8.1, respectively. In the tests WSM, the mean and standard deviation were 8.4 and 3.3, respectively. After removing the second molars in Group 2 and adding them in Group 1, the mean and standard deviation were 15.7 and 14.7 for Group 1 and 12.5 and 10.4 for Group 2, respectively. Within the limitations of this study, placing artificial teeth up to the first molars can be performed when needed without compromising masticatory efficiency.
Assuntos
Arco Dental/patologia , Arco Dental/fisiopatologia , Prótese Total , Mastigação , Adaptação Fisiológica , Idoso , Estudos Cross-Over , Prótese Total/efeitos adversos , Feminino , Humanos , Masculino , Mandíbula/patologia , Mandíbula/fisiopatologia , Maxila/patologia , Maxila/fisiopatologia , Dente MolarRESUMO
The current study used finite element analysis to evaluate how the thickness of reline material and the area of its placement in conventional complete dentures affected the stress distribution in peri-implant bone during function in the healing period. For this study, three-dimensional models were created to simulate a severely resorbed mandible with two implants placed recently in the anterior region. Two of these models received a layer of soft liner material that covered the entire length of the denture base (1.5 mm or 3.0 mm); for the other sample models, soft liner material was placed (in thicknesses of 1.5 mm or 3.0 mm) in the implant region only. The models were exported to mechanical simulation software; two simulations were performed by placing a load in the mandibular right canine (35 N) and the mandibular right first molar (50 N). Data were quantitatively and qualitatively evaluated by means of maximum principal stress. In all cases, models that received 3.0 mm of soft liner material showed lower values of stress concentration than those receiving 1.5 mm of soft liner material. Likewise, localized application of soft liner in the implant region showed lower stress concentration compared with models in which the entire denture base was relined. These results indicate that the thickness and area of reline in conventional complete dentures has a direct effect on stress distribution in the peri-implant bone tissue during the healing period.
Assuntos
Implantes Dentários , Prótese Dentária Fixada por Implante , Reembasadores de Dentadura , Reembasamento de Dentadura , Prótese Total , Análise de Elementos Finitos , Imageamento Tridimensional , Mandíbula/fisiopatologia , Fenômenos Biomecânicos , Reabsorção Óssea/fisiopatologia , Simulação por Computador , Dente Canino , Arco Dental/fisiopatologia , Arco Dental/cirurgia , Materiais Dentários/química , Bases de Dentadura , Humanos , Arcada Edêntula/fisiopatologia , Teste de Materiais , Modelos Biológicos , Dente Molar , Estresse Mecânico , Propriedades de SuperfícieRESUMO
INTRODUCTION: The literature suggests that individuals with history of cleft lip and palate who present with midfacial growth deficiency are at higher risk of presenting lisping. The relationship between distortions during production of linguoalveolar fricative sounds and the severity of malocclusion, however, has not been established for the population with cleft. OBJECTIVE: To study the association between lisping and dental arch relationship. METHODOLOGY: Speech samples and dental arch casts were obtained from 106 children with operated unilateral cleft lip and palate (UCLP) during the stage of mixed dentition and before orthodontic treatment. Videotaped productions of the phrase /u saci saiw sedu/ were rated by speech-language pathologists for the identification of lisping during [s]. Dental arch casts were rated by orthodontists using the Goslon Yardstick and the Five-Year Index to establish dental arch relationship. RESULTS: Multiple logistic regression showed no significant association between lisping and dento-occlusal index (p â=â .802) and age (p â=â .662). Substantial interjudge agreement during auditory-perceptual ratings was found (kappa â=â .63). Almost perfect agreement was found between orthodontists while establishing the dental arch relationship (kappa â=â .81). DISCUSSION: This study failed to reveal an association between lisping and dental arch relationship in children with operated UCLP. Multiple variables may play a role in determining occurrence of lisping, warranting further investigation.
Assuntos
Fenda Labial/fisiopatologia , Fissura Palatina/fisiopatologia , Má Oclusão/fisiopatologia , Distúrbios da Fala/fisiopatologia , Criança , Arco Dental/fisiopatologia , Dentição Mista , Feminino , Humanos , Masculino , Modelos Dentários , Fatores de Risco , Gravação em VídeoRESUMO
OBJECTIVE: To describe the distribution of edentulism and estimate the prevalence of functional dentition and shortened dental arch among elderly population. METHODS: A population-based epidemiological study was carried out with a sample of 5,349 respondents aged 65 to 74 years obtained from the 2002 and 2003 Brazilian Ministry of Health/Division of Oral Health survey database. The following variables were studied: gender; macroregion of residence; missing teeth; percentage that met the World Health Organization goal for oral health in the age group 65 to 74 years (50% having at least 20 natural teeth); presence of shortened dental arch; number of posterior occluding pairs of teeth. The Chi-square test assessed the association between categorical variables. The Kruskal-Wallis and Mann-Whitney tests were used to assess differences of mean between number of posterior occluding pairs teeth, macro-region and gender. RESULTS: The elderly population had an average of 5.49 teeth (SD: 7.93) with a median of 0. The proportion of completely edentulous respondents was 54.7%. Complete edentulism was 18.2% in the upper arch and 1.9% in the lower arch. The World Health Organization goal was achieved in 10% of all respondents studied. However, only 2.7% had acceptable masticatory function and aesthetics (having at least shortened dental arch) and a mean number of posterior occluding pairs of 6.94 (SD=2.97). There were significant differences of the percentage of respondents that met the World Health Organization goal and presence of shortened dental arch between men and women. There were differences in shortened dental arch between macroregions. CONCLUSIONS: The Brazilian epidemiological oral health survey showed high rate of edentulism and low rate of shortened dental arch in the elderly population studied, thus suggesting significant functional and aesthetic impairment in all Brazilian macroregions especially among women.