Study of Anatomical Relationship between Posterior Teeth and Maxillary Sinus Floor in a Subpopulation of the Brazilian Central Region Using Cone-Beam Computed Tomography - Part 2.

This study evaluated the anatomical relationship between posterior teeth root apices and maxillary sinus floor (MSF) on 202 cone beam computed tomography (CBCT) exams. The distance between the root apices and the MSF, as well as the MSF thickness of the cortical bone closest to root apices and furcation regions were measured. The vertical and horizontal relationships of the MSF with the molar roots were classified into categories adapted from the criteria proposed by Kwak et al. (14). The shortest distances between MSF and the root apices were observed in the mesiobuccal root of the second molar (0.36±1.17 mm) and the palatal root of the first molar (0.45±1.10 mm) and the widest in buccal roots of the first premolars (5.47±4.43 mm). Significant differences were observed between the distance of MSF to the root apices of single-rooted first and second premolars. The cortical thickness ranged from 0.65±0.41 mm over the mesiobuccal root of the second molar to 1.28±0.42 mm over the buccal root of the first premolar. The most observed vertical and horizontal relationships were type II and 2H, respectively. The maxillary molar roots showed greater proximity to the MSF. The thickness of the MSF cortical bone closest to the apices and furcation regions was found to be similar only for premolars.

Study of Anatomical Relationship between Posterior Teeth and Maxillary Sinus Floor in a Subpopulation of the Brazilian Central Region Using Cone-Beam Computed Tomography - Part 2

Abstract This study evaluated the anatomical relationship between posterior teeth root apices and maxillary sinus floor (MSF) on 202 cone beam computed tomography (CBCT) exams. The distance between the root apices and the MSF, as well as the MSF thickness of the cortical bone closest to root apices and furcation regions were measured. The vertical and horizontal relationships of the MSF with the molar roots were classified into categories adapted from the criteria proposed by Kwak et al. (14). The shortest distances between MSF and the root apices were observed in the mesiobuccal root of the second molar (0.36±1.17 mm) and the palatal root of the first molar (0.45±1.10 mm) and the widest in buccal roots of the first premolars (5.47±4.43 mm). Significant differences were observed between the distance of MSF to the root apices of single-rooted first and second premolars. The cortical thickness ranged from 0.65±0.41 mm over the mesiobuccal root of the second molar to 1.28±0.42 mm over the buccal root of the first premolar. The most observed vertical and horizontal relationships were type II and 2H, respectively. The maxillary molar roots showed greater proximity to the MSF. The thickness of the MSF cortical bone closest to the apices and furcation regions was found to be similar only for premolars.

Resumo Avaliou-se a relação anatômica entre dentes posteriores e o soalho do seio maxilar (SSM) por meio da tomografia computadorizada de feixe cônico (TCFC) em 202 exames. A distância entre os ápices radiculares e o SSM, bem como a espessura do osso cortical do SSM próximo dos ápices radiculares e áreas de bifurcação foram medidas. As relações verticais e horizontais do SSM com as raízes dos molares foram classificados em categorias adaptadas a partir dos critérios propostos pelo Kwak et al. (14). A menor distância entre o SSM e os ápices dentários foi observada na raiz mesiovestibular do segundo molar (0,36±1,17 mm) e na raiz palatina do primeiro molar (0,45±1,10 mm), e a maior na raiz vestibular do primeiro pré-molar (5,47±4.43 mm). Diferenças significantes foram observadas entre a distância do SSM e os ápices dentários de primeiros e segundos pré-molares unirradiculares. A espessura da cortical óssea variou de 0,65±0,41 mm na região da raiz mesiovestibular do segundo molar a 1,28±0,42 na raiz vestibular do primeiro pré-molar. As relações vertical e horizontal mais prevalentes foram do tipo II e 2H, respectivamente. As raízes dos molares superiores apresentaram maior proximidade com o SSM. A espessura da cortical óssea do SSM nas regiões mais próximas dos ápices e área de furca foi similar apenas para os pré-molares.

Evaluation of Periapical Lesions and Their Association with Maxillary Sinus Abnormalities on Cone-beam Computed Tomographic Images.

INTRODUCTION: Periapical inflammation is often responsible for distinct maxillary sinus (MS) changes. This retrospective, cross-sectional study evaluated the association between the clinical characteristics of periapical lesions (presence, size, and distance) in maxillary posterior teeth and the presence of sinus abnormalities by evaluating cone-beam computed tomographic (CBCT) images obtained from an archived collection. Apart from sex, no other patient information was available. METHODS: The study sample was composed of CBCT images of 143 MSs of patients with at least 1 maxillary posterior tooth with a periapical lesion and 178 MSs of patients without periapical radiolucent lesions. Sinus abnormalities were classified as mucosal thickening, sinus polyp, antral pseudocyst, nonspecific opacification, periostitis, and antral calcification; periapical radiolucent areas were classified using the CBCT periapical index, and the distance between the periapical lesion edge and the MS floor was measured. Data were analyzed using chi-square tests at a level of significance set at α = 0.05. RESULTS: Most sinus abnormalities were associated with at least 1 maxillary posterior tooth with a periapical lesion (P > .05). The most frequent sinus abnormality in the presence of a periapical lesion was mucosal thickening. All teeth with a CBCT periapical index score of 5 were associated with sinus abnormalities. The highest frequency of abnormalities was found when the radiolucent area was subjacent to the sinus floor. CONCLUSIONS: Maxillary posterior teeth with periapical radiolucent lesions had the highest frequency of sinus abnormalities. The size of a periapical lesion was not associated with the frequency of sinus abnormalities. A close spatial relationship between periapical lesions and sinuses resulted most frequently in sinus abnormalities.