Avaliação da influência do Led/laser sobre diferentes concentrações de peróxido de hidrogênio no clareamento dental imediato

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências da Saúde, Programa de Pós-Graduação em Odontologia, Florianópolis, 2009O objetivo desta pesquisa foi avaliar a influência do sistema luminoso LED/LASER Whitening Lase Light Plus (DMC), com 6 LEDs de 470nm e 3 diodos laseres infravermelhos de 830nm de 0,2W de potência, aplicado com peróxido de hidrogênio 35% (Lase Peroxide 35% Sensy DMC Equipamentos) e 25% (Lase Peroxide 25% Sensy DMC Equipamentos) sobre o clareamento dental imediato. Os agentes clareadores foram aplicados, em 10 voluntários, com espessuras próximas a 1mm em cada arco de um mesmo paciente, sendo peróxido de hidrogênio 35% no arco superior e 25% no arco inferior. Nos hemi-arcos direitos, o conjunto LED/LASER foi aplicado 3 vezes durante 1 minuto cada uma, intercaladas com intervalos de 1 minuto sem irradiação luminosa. Após, 4 minutos de repouso, o gel foi substituído e o protocolo citado repetido por mais 2 vezes, totalizando 30 minutos, dos quais 9 irradiados. Nos hemi-arcos esquerdos o gel clareador não sofreu nenhuma irradiação luminosa, protegido por uma placa divisora de arcadas durante a irradiação dos hemiarcos direitos, permanecendo pelo mesmo tempo que nos hemi-arcos direitos (10 minutos por 3 vezes). Após 7 dias, os voluntários retornaram para avaliação da percepção do grau de clareamento e de sensibilidade. De acordo com a avaliação do pesquisador e dos pacientes, através do questionário, não houve diferença perceptível do grau de clareamento entre os hemi-arcos direitos e esquerdos (com e sem aplicação de sistema luminoso, respectivamente), em ambas concentrações de gel clareador (25 e 8 35%). Também foi relatada ausência de diferença no grau de ensibilidade entre as hemi-arcadas.The purpose of this research was to evaluate the influence of the LED/LASER Whitening Lase Light Plus bleaching system (DMC) with 6 LEDs of 470nm e 3 infra red lasers diodes of 830nm power of 0,2W over 35% and 25% hydrogen peroxide (Lase Peroxide 35% Sensy DMC Equipments) in 10 volunteers. The bleaching agents were applied in 1mm thickness to each arch. The LED/LASER set was applied for 1 minute, interpolated by 1 minute without luminous irradiation for 3 times, followed by 4 minutes break, then the bleaching agent was replaced. This protocol was repeated for 3 times in the right half arch. In the left half-archs the procedure was the same but without any luminous irradiation, through a dain protector plate of dental archs. After 7 days, the volunteers returned for a evaluation of sensibility and bleaching degree. According to the researcher and patients evaluation, through questionnaire, there wasnt noticeable difference in bleaching degree between the right and left half-archs (with and without luminous system application respectively), in both dental bleaching concentrations (25 and 35%). It was reported no difference in the sensibility degree between the half-archs, as well

Soft-tissue cone-beam computed tomography (ST-CBCT) technique for the analysis of skeletal, dental and periodontal effects of orthopedic rapid maxillary expansion

Orthopedic rapid maxillary expansion (RME) is a common treatment of choice for managing transverse deficiency of the maxilla. This approach may have desired and undesired skeletal, dental and periodontal effects that may be assessed clinically or through imaging techniques. This study aims to investigate the dental, skeletal and periodontal effects of orthopedic RME using the soft-tissue cone-beam computed tomography (CBCT) technique. The sample consisted of 10 patients (5males and 5 females) aged between 10 and 14 years (mean age: 12.5 years) treated with Hyrax orthopedic device. CBCT scans set for the registration of soft tissue (ST-CBCT) were taken from each patient before (T1) and 120 days after (T2) RME. Skeletal (n=10), dental (n=1) and periodontal (n=4) parameters measured in ST-CBCT were compared between T1 and T2 using t-test within a significance level of 5%. The skeletal parameters with statistically significant increase (p<0.05) in T2 were the width of the buccal alveolar bone crest, the external width of the dental arch at the level of buccal cusps, and the width of the dental arch at the level of most prominent dental surface contour. Representing the dental parameter, the inclination of the anchor teeth was statistically significant for premolars (p<0.05). The only statistically significant outcome in periodontal parameters was the decrease in buccal bone plate thickness of first molars (p<0.05). Dentists must be aware of the ST-CBCT technique for the analysis of hard and soft tissue after orthodontic and orthopedic treatments. This technique revealed that the RME reached optimal skeletal and dental effects with minimal periodontal side effects

Bolton ratio in subjects with normal occlusion and malocclusion

Aim: To verify the presence of Bolton anterior and total discrepancy in Brazilian individuals with natural normal occlusion and Angle’s Class I and Class II, division 1 malocclusions. Methods: The sample was divided in three groups (n=35 each): natural normal occlusion; Class I malocclusion; Class II, division 1 malocclusion. Of the 105 Caucasian Brazilian individuals, 24 were boys and 81 were girls aged from 13 to 17 years and 4 months. The mesiodistal width of the maxillary and mandibular teeth, from the left first molar to the right first molar, was measured on each pre-treatment dental plaster cast using a digital caliper accurate to 0.01 mm resolution. Values were tabulated and the Bolton ratio was applied. The Kolmogorov-Smirnov test was used to verify if data were normally distributed (p>0.2). For comparison between the values obtained and those from the Bolton standard, Student’s t test was used and one-way ANOVA was used for comparisons among the 3 groups, with a significance level of 5% (p<0.05). Results: For groups 1, 2 and 3, respectively, the total ratio found was 90.36% (SD 1.70), 91.17% (SD±2.58) and 90.76% (SD±2.45); and the anterior ratio was 77.73% (SD 2.39), 78.01% (SD 2.66) and 77.30% (SD 2.65). Conclusions: There was no significant difference among the groups regarding the values indicated in the Bolton ratio

Bolton ratio in subjects with normal occlusion and malocclusion

verify the presence of Bolton anterior and total discrepancy in Brazilian individuals with natural normal occlusion and Angles Class I and Class II, division 1 malocclusions. Methods: The sample was divided in three groups (n=35 each): natural normal occlusion; Class I malocclusion; Class II, division 1 malocclusion. Of the 105 Caucasian Brazilian individuals, 24 were boys and 81 were girls aged from 13 to 17 years and 4 months. The mesiodistal width of the maxillary and mandibular teeth, from the left first molar to the right first molar, was measured on each pre-treatment dental plaster cast using a digital caliper accurate to 0.01 mm resolution. Values were tabulated and the Bolton ratio was applied. The Kolmogorov-Smirnov test was used to verify if data were normally distributed (p>0.2). For comparison between the values obtained and those from the Bolton standard, Students t test was used and one-way ANOVA was used for comparisons among the 3 groups, with a significance level of 5% (p<0.05). Results: For groups 1, 2 and 3, respectively, the total ratio found was 90.36% (SD 1.70), 91.17% (SD±2.58) and 90.76% (SD±2.45); and the anterior ratio was 77.73% (SD 2.39), 78.01% (SD 2.66) and 77.30% (SD 2.65). Conclusions: There was no significant difference among the groups regarding the values indicated in the Bolton ratio

Time of guard of orthodontic records versus legal time for their prescription

INTRODUCTION: After promulgation and wider dissemination of the Code of Consumer Protection, there was an increase in the number of legal conflicts between patients and dentists, leading these health professionals to increasingly guard themselves from possible lawsuits. As such, it becomes critical the preparation of an adequate and complete clinical record, even though the keeping time remains uncertain. OBJECTIVE: To review the literature and discuss the keeping time of orthodontic records versus the legal time for their prescription, as well as to propose a model of a Term upon Completion of Dental Treatment. CONCLUSION: It is advised to return part of the clinical records to their rightful owners by means of an itemized receipt. The Term upon Completion reflects the patient's awareness and could be considered by the CCP as the initial term of the prescription time, because it implicates that the patient recognizes the quality of service provided and satisfactory results achieved

Assessment of torque angle of brackets from different brands

measure torque angle values of brackets designed for canines, comparing it to their prescription values. Methods: One hundred and sixty maxillary (-2o ) and mandibular (-11o ) canine brackets of Roth prescription from the following brands were selected: Abzil, Eurodonto, Morelli and Ormco. The brackets were set in wax and images were obtained by scanning. Reference points were determined over these images, lines drawn and the torque angle was measured. The Students t-test and the Wilcoxon signed-rank test were used at a significance level of 5%. Results: For maxillary canine brackets, the medium torque angle values were: Abzil - 0.93o (± 0.88o ); Eurodonto 0.13o (± 0.34o ); Morelli -2.56o (± 0.50o ), and Ormco -1.16o (± 1.27o ). For mandibular canine brackets, the values were: Abzil -11.76o (± 0.40o ); Eurodonto -10.40o (± 0.25o ); Morelli -11.18o (± 0.56o ), and Ormco -11.36o (± 0.30o ). For maxillary canine brackets, the brands Abzil, Morelli, and Ormco presented statistically diferente values from those indicated for prescription. For mandibular canine brackets, the brands Abzil, Eurodonto, and Ormco presented statistically different values from the prescribed ones. Conclusions: Some marketed brands present differences between the torque angle found in the brackets and those recommended in the prescription. However, these differences are clinically acceptable