ABSTRACT
Objetivo: Este estudo retrospectivo avaliou a perda dos segundos molares decíduos, por rizólise fisiológica ou patológica, em pacientes atendidos nas Clínicas de Odontopediatria I e II da Universidade Federal de Pernambuco. Foram examinados 112 prontuários, sendo os dados registrados em fichas individuais. Método: Foram analisadas as seguintes variáveis: gênero, faixa etária, tipo de tratamento (invasivo ou não invasivo), tipo de reabsorção dentária (patológica ou fisiológica) e arco dentário. Resultados: A reabsorção fisiológica foi mais frequente que a reabsorção patológica em ambos os arcos. Foi observado que existe associação estatisticamente significante entre a faixa etária de 2 a 4 anos e a reabsorção dentária (p<0,001). A média de idade dos pacientes para reabsorção fisiológica foi de 6,65 e 4,49 anos para a reabsorção patológica dos segundos molares decíduos. Conclusão: Houve perda precoce de segundos molares decíduos. Há grandes possibilidades de comprometimento da oclusão funcional do indivíduo.
Aim: This retrospective study evaluated the loss of the second deciduous molars either by physiological or pathological root resorption in patients enrolled at the Pediatric Dentistry Clinic I and II at the Federal University of Pernambuco. Methods: A review of 112 patient records were assessed and registered in a form. The following variables were analyzed: gender, age, type of treatment (invasive or no invasive), type of resorption (physiological or pathological) and region (maxillary or mandibular). Results: The physiological resorption was more observed than the pathological resorption in both arches. It was noted that there was a statistically significant association between the age group of 2-4 years old and the resorption (p<0.001). The mean age of patients for physiological resorption was 6.65 and 4.49 years old for pathological resorption of the second deciduous molars. Conclusion: It can be concluded that there was an early deciduous second molars loss. There are great possibilities of impaired functional occlusion of the individual.
ABSTRACT
AIM: Cone beam computed tomography (CBCT) was used to evaluate the ability of three NiTi rotary systems to maintain the original root canal anatomy. METHODS: Sixty mesiobuccal canals of human mandibular first molars were divided into three groups with 20 root canals each. All teeth were scanned by CBCT before instrumentation. The images were captured digitally for further analysis using the Image Tools Software. The images were sectioned in three points, located at 9 mm, 6 mm and 3mm from the apex. In Group 1, the root canals were instrumented with ProTaper UniversalTM rotary system; in Group 2, with Twisted FileTM rotary system; and in Group 3, with MtwoTM rotary system. Instrumented teeth were scanned again using CBCT and the images of the uninstrumented canals were compared with images of the instrumented canals. The results were statistically analyzed using the one-way ANOVA test. A level of significance of 0.05 was adopted. RESULTS: The means of D1 at distances of 9 mm, 6 mm, and 3 mm from the apex were, respectively: Group 1: 0.88±0.257, 1.00±0.000, and 1.00±0.000; Group 2: 0.79±0.745, 0.65±0.669, and 0.25±0; Group 3: 0.50±0.745, 0.33±0.472, and 0.03±0.104. The means of D2 at distances of 9 mm, 6mm, and 3mm from the apex were respectively: Group 1: 1.00±0.00, 1.00±0.00, and 1.00±0.00; Group 2: 0.41±0.299, 0.30±0.428, and 0.50±0.707; Group 3: 0.58±0.910, 0.85±1.857, and 0.31±0.643. CONCLUSIONS: The CBCT analysis revealed that the ProTaper UniversalTM produced centered preparations and while the Twisted FileTM and MtwoTM rotary systems produced canal deviation.