Browsing by Author "Pereira, Dinis"
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- Assessment of the relationship between oral health-related quality of life (OHRQoL) and dental malocclusion in a Portuguese samplePublication . Pereira, Dinis; Machado, Vanessa; Botelho, João; Proença, Luís; Delgado, Ana; Mendes, José João
- Blood pressure and tooth loss : a large cross-sectional study with age mediation analysisPublication . Mendes, José João; Viana, João; Cruz, Filipe; Pereira, Dinis; Ferreira, Sílvia; Pereira, Paula; Proença, Luís; Machado, Vanessa; Botelho, João; Rua, João; Delgado, Ana SintraWe aimed to investigate the association between blood pressure (BP) and tooth loss and the mediation effect of age. A cross-sectional study from a reference dental hospital was conducted from September 2017 to July 2020. Single measures of BP were taken via an automated sphygmomanometer device. Tooth loss was assessed through oral examination and confirmed radiographically. Severe tooth loss was defined as 10 or more teeth lost. Additional study covariates were collected via sociodemographic and medical questionnaires. A total of 10,576 patients were included. Hypertension was more prevalent in severe tooth loss patients than nonsevere tooth lost (56.1% vs. 39.3%, p < 0.001). The frequency of likely undiagnosed hypertension was 43.4%. The adjusted logistic model for sex, smoking habits and body mass index confirmed the association between continuous measures of high BP and continuous measures of tooth loss (odds ratio (OR) = 1.05, 95% CI: 1.03–1.06, p < 0.001). Age mediated 80.0% and 87.5% of the association between periodontitis with both systolic BP (p < 0.001) and diastolic BP (p < 0.001), respectively. Therefore, hypertension and tooth loss are associated, with a consistent mediation effect of age. Frequency of undiagnosed hypertension was elevated. Age, gender, active smoking, and BMI were independently associated with raised BP.
- Bolton ratios in Portuguese subjects among different malocclusion groupsPublication . Machado, Vanessa; Botelho, João; Pereira, Dinis; Vasques, Mariana; Fernandes-Retto, Paulo; Proença, Luís; Mendes, José João; Delgado, AnaBACKGROUND: Several methods have been described to estimate inter-arch tooth size relationship, such as Bolton's ratios. The aims of this study were to verify the validity of Bolton indexes in a sample of untreated Portuguese subjects based on Angle classification and to evaluate the gender difference. MATERIAL AND METHODS: 168 pre-treatment dental casts of orthodontics Portuguese subjects (59 males and 109 females) with different occlusions were used, which were selected randomly from 541 consecutively treated orthodontic patients. The mesiodistal widths from first molar to first molar were measured on each pre-treatment cast to the nearest 0.01 mm using digital caliper, and Bolton's anterior and overall ratios were calculated. Descriptive statistics as mean, standard deviation and range were calculated. Moreover, the results were compared to Bolton's ratios and differences based on gender and occlusion groups were evaluated by statistical inference methods. RESULTS: The results reveal that the mean values, standard deviation and range were larger than Bolton's in normal occlusion group (78.3±3.5% in anterior ratio and 92.1±2.2% in overall ratio) and there were no differences between genders (p >0.05). Class I (anterior and overall ratios, p=0.001 and p<0.001, respectively), Class II/2 (anterior ratio, p=0.032) and Class III (overall ratio, p=0.041) were significantly different from Bolton's reference data. CONCLUSIONS: The results showed no differences between gender and no difference between normal occlusion and malocclusion groups. Moreover, in normal occlusion group, the anterior and overall tooth size ratios was equivalent to the original Bolton's ratios, although the mean and standard deviation were large.
- Comparison of pain perception between clear aligners and fixed appliances: a systematic review and meta-analysisPublication . Pereira, Dinis; Machado, Vanessa; Botelho, João; Proença, Luís; Mendes, José João; Delgado, Ana SintraWe aimed to compare the pain discomfort levels between clear aligners and fixed appliances at multiple time points. Four electronic databases (Pubmed, Medline, CENTRAL and Scholar) were searched up to May 2020. There were no year or language restrictions. Randomized clinical trials and case–control studies comparing pain perception through pain visual analog scale (VAS) in patients treated with clear aligners and with fixed appliances were included. Risk of bias within and across studies was assessed using Cochrane tool and Newcastle–Ottawa Scale (NOS) approach. Random-effects meta-analysis were conducted. VAS score and analgesic consumption were collected. Random-effects meta-analyses were used to synthesize available data. Following the review protocol, five articles met the inclusion criteria and were included, with a total of 273 participants (177 females, 96 males). Overall, clear aligners were associated with significantly less pain than fixed appliances during the first seven days of orthodontic treatment. Patients treated with clear aligners experience less pain discomfort than those treated with fixed appliances and consume less analgesics, with SORT A recommendation.
- Evaluation of the relationship between oral health-related quality of life (OHRQoL) and skeletal malocclusion : a pilot studyPublication . Pereira, Dinis; Machado, Vanessa; Botelho, João; Proença, Luís; Delgado, Ana; Mendes, José João
- Ortodontia plástica - conceito e diferentes sistemasPublication . Pereira, Dinis; Fernandes, Margarida; Gaudêncio, Filipa; Retto, Paulo Fernandes; Delgado, Ana SintraA necessidade de tratamento ortodôntico, na maioria dos pacientes, prende-se com a procura de alinhamento dentário ou de estética facial. A pouca popularidade dos aparelhos fixos tradicionais metálicos entre os pacientes deve-se ao reduzido sentido estético e receio de dor. Os aparelhos plásticos transparentes são uma boa alternativa (especialmente em jovens adultos com dentição permanente) para proceder ao tratamento ortodôntico, na medida em que não levantam tantas questões estéticas. Porém, há sistemas de ortodontia plástica que apresentam limitações e apenas tratam casos simples a nível anterior ou recidivas após tratamento ortodôntico. Existem assim vários sistemas que conseguem corrigir diversos tipos de maloclusões mais severas, mas o clínico tem que estar ciente sempre das limitações e decidir qual o sistema viável para proceder ao tratamento com ortodontia plástica.