Variation of Tooth Crown Size in Cleft Lip and Palate Patients.

AIM: This study aims to compare the mesiodistal (MD) and buccolingual (BL) tooth crown size (TCS) of adult patients with cleft lip and palate (CL/P) and patients without CL/P. MATERIALS AND METHODS: The sample of this study consisted of 146 adult patients, of both genders, of which 73 were included in the case group (with CL/P) and 73 were included in the control group (without CL/P). Data regarding gender and age and cleft type were collected. In addition, dental models were evaluated to obtain the TCS in the maximum distance of the MD and BL dimensions of all erupted permanent teeth (except third molars). The results were submitted to statistical analysis with a significance level of 0.05. RESULTS: In the upper arch, the central incisors (CI) were smaller in the case group for the MD and BL dimensions (p < 0.05). The lateral incisors (LI) and canine (C) were smaller only in the BL width (p < 0.05) and the second molars (SM), were smaller only in the MD dimensions. In the lower arch, there were significant differences only in the BL width between groups, the CI and LI presented smaller measurements in CL/P patients, while the left first molar (FM) and right first premolar (FPM) were larger (p < 0.05) than in patients without CL/P. CONCLUSION: Patients with CL/P have different sizes in certain teeth compared to patients without CL/P. CLINICAL RELEVANCE: Cleft lip and palate patients usually present important dental anomalies; thereby, the knowledge about trends in tooth size variations in CL/P patients can aid in dental and orthodontic treatment planning to obtain a stable, functional, and esthetic occlusion.

Avaliação da transmissão de temperatura da resina acrílica para os ossos cortical e medular por meio de redes de Bragg / Evaluation of the temperature transmission of the acrylic resin to the cortical and medullary bones through the Bragg's grating

O objetivo do estudo foi avaliar a alteração de temperatura nos ossos cortical e medular gerados pela resina acrílica na união dos transferentes por meio das redes de Bragg. Foram selecionados dois implantes cone morse Titamax (Neodent) 4 mm x 15 mm. Os implantes foram inseridos em um osso artificial da marca Sawbones, de acordo com as instruções do fabricante, cuja localização dos pilares foi referente aos dentes 44 e 46 com ausência do dente 45. Sobre os implantes foram instalados transferentes para a técnica aberta. Os transferentes foram esplintados por meio de um fio dental e aplicação de resina acrílica pela técnica de Nealon. Foram selecionadas duas resinas acrílicas: Duralay e GC Pattern LS. Dois sensores de fibra ótica foram posicionados, sendo um próximo à região cervical e outro na região apical do implante. Os sensores mensuraram a transferência de calor para o osso cortical e medular com o auxílio de uma pasta térmica (Implastec). Os dados foram submetidos à análise estatística por meio dos testes de normalidade de Shapiro-Wilk, ANOVA a dois critérios e teste de múltiplas comparações post hoc LSD (p<0,05). Foram encontradas diferenças significativas entre Duralay apical eGC Pattern LS cervical, GC Pattern LS cervical eGC Patternapical (p<0,05). As redes de Bragg apresentaram-se sensíveis para a mensuração da transferência de temperatura do transferente para os ossos cortical e medular. A partir dos resultados obtidos, pode-se afirmar que não há risco de necrose óssea (AU).

The purpose of the study was to evaluate the temperature change in the cortical and medullary bones generated by the acrylic resin in the union of transferents through the Bragg's grating. Two cone morse Titamax (Neodent) 4 mm x 15 mm implants were selected. The implants were inserted into a Sawbones artificial bone according to the manufacturer's instructions, abutment location were teeth 44 and 46 with absence of tooth 45. On the implants tranfers were installed for the open technique. The transfers were splined by means of a dental floss and acrylic resin application by the Nealon technique. Two acrylic resins were selected: Duralay and GC Pattern LS. Two fiber optic sensors were positioned, one near the cervical region and other at the implant apical region. The sensors measured the heat transfer to the cortical and medullary bones with the help of a thermal paste (Implastec). Data were submitted to statistical analysis using Shapiro-Wilk normality tests, two way ANOVA, and post hoc LSD multiple comparisons (p <0.05). Significant differences were found between Duralay apical and GC Pattern LS cervical, GC Pattern LS cervical and GC apical Pattern (p <0.05). The Bragg's grating were sensitive to temperature transference measurement from transfers to the cortical and medullary bones. From the results obtained, it is possible to ssure that there is no risk of bone necrosis (AU).