oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Study of position and eruption of lower third molars in adolescents
Eduardo Machado Vilela,Paula Amorim Vitoi
RSBO , 2011,
Abstract: Introduction: The occurrence of retained lower third molars (3M) is common. A careful analysis is necessary for proper clinical management and the radiographic examination is fundamental. The use of panoramic radiographs is extremely important for the analysis and classification of 3M position, allowing the diagnosis and the establishment of the treatment planning for the removal of these teeth. Objective: The aim of this study was to evaluate the changes in position and eruption state of lower 3M during a period of 3.6 years, as well as to identify factors that may be related with early diagnosis of dental retention of these teeth in adolescent patients. Material and methods: One hundred and one initial (T1) and final (T2) panoramic radiographs from patients treating at the university’s orthodontic clinics were analyzed. The distribution of 195 lower 3Ms was evaluated taking into account personal data, collected from clinical records. The data obtained in relation to the positioning of the teeth were based on the ratings of Winter and Pell & Gregory. Results: The results showed that vertical position was the most prevalent and the C level and class II positions were predominant. The changes occurring in 3M position during the study interval were not statistically significant. Conclusion: After the final evaluation (T2) it was concluded that unpredictable changes in lower 3Ms position and eruption may occur. The variables race (P = 0.03) and anterior border of the mandibular ramus (P = 0.007) seem to have influence on the level of eruption, also suggesting influence on this tooth retention within dental arches over the years.
Pattern of third molar impaction in a Saudi population
Ali H Hassan
Clinical, Cosmetic and Investigational Dentistry , 2010, DOI: http://dx.doi.org/10.2147/CCIDE.S12394
Abstract: ttern of third molar impaction in a Saudi population Original Research (4983) Total Article Views Authors: Ali H Hassan Published Date October 2010 Volume 2010:2 Pages 109 - 113 DOI: http://dx.doi.org/10.2147/CCIDE.S12394 Ali H Hassan1 1Department of Preventive Dental Sciences, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia Objective: To evaluate the current pattern of third molar impaction in a sample of Saudi patients. Methods: One thousand thirty-nine orthopantomograms (OPG) of patients ranging in age from 19 to 46 years (536 males and 503 females) were evaluated to determine the frequency of impacted third molars, their levels of eruption, and their angulations. Results: Four hundred twenty-two (40.5%) of the 1039 OPG showed at least one impacted third molar, with no significant difference between males (222; 52.6%) and females (200; 47.4%) (P = 0.284). The most common number of impacted third molars per OPG was one (72.5%). Impacted third molars were 1.64 times more likely to occur in the mandible than in the maxilla. The most common angulation of impaction in the mandible was the mesial (33.4%), while the most common angulation in the maxilla, was the vertical (49.6%). Level B impaction was the most common in both maxilla (48.2%) and mandible (67.7%). There was no significant difference in the frequency of impaction between the right and left sides in both jaws. Conclusion: The pattern of third molar impaction in the western region of Saudi Arabia is characterized by a high prevalence of impaction that is greater in the mandibles and with no sex predilection.
Pattern of third molar impaction in a Saudi population  [cached]
Ali H Hassan
Clinical, Cosmetic and Investigational Dentistry , 2010,
Abstract: Ali H Hassan11Department of Preventive Dental Sciences, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi ArabiaObjective: To evaluate the current pattern of third molar impaction in a sample of Saudi patients.Methods: One thousand thirty-nine orthopantomograms (OPG) of patients ranging in age from 19 to 46 years (536 males and 503 females) were evaluated to determine the frequency of impacted third molars, their levels of eruption, and their angulations.Results: Four hundred twenty-two (40.5%) of the 1039 OPG showed at least one impacted third molar, with no significant difference between males (222; 52.6%) and females (200; 47.4%) (P = 0.284). The most common number of impacted third molars per OPG was one (72.5%). Impacted third molars were 1.64 times more likely to occur in the mandible than in the maxilla. The most common angulation of impaction in the mandible was the mesial (33.4%), while the most common angulation in the maxilla, was the vertical (49.6%). Level B impaction was the most common in both maxilla (48.2%) and mandible (67.7%). There was no significant difference in the frequency of impaction between the right and left sides in both jaws.Conclusion: The pattern of third molar impaction in the western region of Saudi Arabia is characterized by a high prevalence of impaction that is greater in the mandibles and with no sex predilection.Keywords: third molar, impaction, prevalence, Saudi
Evaluation of the space available for eruption of maxillary second and third molars after distalization of maxillary first molars
Francisco Alexandre Baptista da Silva,Marco Antonio Scanavini
RSBO , 2010,
Abstract: Objective: The objective of this study was to evaluate cephalometrically the space available for eruption of maxillary second and third molars in the region of the maxillary tuberosity after distalization of maxillary permanent first molars.Material and methods: The sample consisted of 38 right lateral cephalograms obtained from 19 Brazilian patients,of Caucasian and African descent, with average age of 9 years and 5 months.Cephalograms were taken before and after distalization of maxillary permanent first molars. The space from the end of the maxillary tuberosity to the distal aspect of the maxillary permanent first molar was evaluated.Student’s t test was applied for the statistical analysis,and the correlation between space and angulation was analyzed by the Pearson correlation coefficient.Results and conclusion:The corresponding space between the distal aspect of maxillary permanent first molars and the end of the maxillary tuberosity, before and after distalization,is not enough for eruption of the maxillary second and third molars.The crowns revealed distal angulation before and after distalization.The correlation of angulation of crowns of maxillary second and third molars and the space for eruption revealed that the greater the distal angulation of crowns,the smaller will be the space available for eruption.
Clinical study of the lower third molars eruption level influence on incidence of acute infection  [PDF]
Matijevi? Stevo,Marjanovi? Marjan
Stomatolo?ki Glasnik Srbije , 2005, DOI: 10.2298/sgs0502083s
Abstract: The aim of this paper was estimate if there was correlation between clinically and radiographically evaluated eruption level of the lower third molar and incidence and severity of the acute infection, respectively. Methods and material: The study was conducted in 100 male examinees, age range from 18 to 25 years old, with clinical and radiographic diagnosis of partially erupted or non erupted third molars. Results: Total number of examinees with clinically registered partially erupted lower third molars was 75, of which 62 (82.6%) manifested infection. Non erupted third molars were in 25 examinees of which 11 (44%) had signs of infection. Partial eruption stage of the third molar was the most common cause of the light infection form (68.8%). Infective complications in over 60% of examinees were related to higher levels of teeth eruption. Higher eruption positions of lower third molars were causing light infections in 56.1%, and in 31.5% - severe forms of infection. Most frequently, lower third molar was related to occurrence and severity of the infection when positioned in occlusal plane level. Conclusion: Partially erupted lower third molar, when positioned in occlusal plane level, is the high risk tooth for an infection to occur.
Agenesis of third molars in students from the Dentistry Academic Program of Universidad del Valle, 16 to 25 years old
Sarmiento Pedro
Colombia Médica , 2004,
Abstract: Background: Third molars are the teeth reported in the literature, that present more variability in number, shape and size. There is no information reported in the Colombian literature concerning the agenesis of the third molar in Colombians. This data may changes constantly from one population to another. This study was looking for agenesis of the third molars and performed on dental students at the Universidad del Valle. Objectives: Determine dental agenesis of the third molars and describe characteristics such as gender, arcade, and dental quadrants. Method: A descriptive study using 1824 periapical radiographs of 456 people aged 16 to 25 years old. Results: The results showed that 96 students didn t developed some or none of third molars, which corresponds to 21% agenesis of the studied population. No significant statistical differences were found on gender, in the mandible and maxilla, neither in the left and right sides Conclusion: The percentage of agenesis in this study is consistent with most of the reports in the literature, in populations from different parts of the world.
Incidental Finding Of Paradental Cyst And Odontogenic Keratocyst In The Dental Follicles Of Lower Impacted Third Molars.-Report Of Two Cases
Monica Yadav
Oral & Maxillofacial Pathology Journal , 2012,
Abstract: The purpose of this article is to report on different aspects of two cases involving the dental follicle associated with impacted teeth This paper reports two cases who underwent surgical removal of unerupted lower third molars without clinical evidence of any follicular lesion one a 21-yearold,and another patient aged 30years who were diagnosed with paradental cyst and odontogenic keratocyst respectively in the dental follicles of the lower unerupted third molar. This case report raises the question as to whether histological examination of all dental follicular tissues removed along with impacted third molars should be mandatory.
Immunohistochemical Analysis of Human Homologue of Drosophila Patched (PTCH) in Dental Follicles of Impacted Third Molars
Oliveira,David Moraes de; Silveira,Márcia Maria Ferreira da; Andrade,Emanuel Sávio de Souza; Sobral,Ana Paula Veras; Martins-Filho,Paulo Ricardo Saquete; Santos,Thiago de Santana; Oliveira,Patrícia Leimig Amorim de; Peixoto,Aline Carvalho; Santos,Jadson Alípio Santana de Souza; Piva,Marta Rabello;
International Journal of Morphology , 2012, DOI: 10.4067/S0717-95022012000100018
Abstract: this study investigated the immunodetection of ptch in epithelial components of dental follicles associated with impacted third molars without radiographic signs of pathosis. one hundred and five specimens of dental follicles associated with impacted third molars with incomplete rhizogenesis (between nolla's stage 6 and 9) were surgically removed from 56 patients. epithelial cell proliferation was determined by using immunohistochemical labeling. statistical analysis was performed using fisher exact test and a level of significance of 5%. of the 105 dental follicles collected, 3 were ptch-positive. the specimens with squamous metaplasia and epithelial hyperplasia had higher rates of positivity for ptch, as well as those with active remnants of odontogenic epithelium. this study suggests that the odontogenic cells of the dental follicle might be proliferating during the rhizogenesis, while the squamous metaplasia and hyperplasia of the epithelial lining and proliferative odontogenic epithelial rests show the differentiation potential of dental follicles.
Immunohistochemical Analysis of Proliferating Cell Nuclear Antigen (PCNA) in Dental Follicles of Impacted Third Molars
Oliveira,David Moraes de; Silveira,Márcia Maria Ferreira da; Andrade,Emanuel Sávio de Souza; Sobral,Ana Paula Veras; Martins-Filho,Paulo Ricardo Saquete; Santos,Thiago de Santana; Oliveira,Patrícia Leimig Amorim de;
International Journal of Morphology , 2011, DOI: 10.4067/S0717-95022011000200037
Abstract: this study investigated the immunodetection of pcna in epithelial components of dental follicles associated with impacted third molars without radiographical and morphological signs of pathosis. a total of 105 specimens of dental follicles associated with impacted third molars with incomplete rhizogenesis (between nolla's stage 6 and 9) were surgically removed from 56 patients. epithelial cell proliferating was determined by using immunohistochemical labeling. statistical analysis was performed using the fisher exact test. of the 105 dental follicles collected, 6 were pcna-positive ( 6%). the specimens with squamous metaplasia and epithelial hyperplasia had higher rates of positivity for pcna, as well as those with proliferative remnants of odontogenic epithelium. in conclusion, this study shows that dental follicles at this stage of development have low proliferative potential, but suggests that squamous metaplasia, hyperplasia of the epithelial lining and presence of proliferative odontogenic epithelial rests in the connective tissue may be early signs of developing lesions of odontogenic origin.
Bone resorption in incompletely impacted mandibular third molars and acute pericoronitis  [cached]
Minoru Yamaoka,Yusuke Ono,Masahiro Takahashi,Ryosuke Doto
Clinical, Cosmetic and Investigational Dentistry , 2009,
Abstract: Minoru Yamaoka, Yusuke Ono, Masahiro Takahashi, Ryosuke Doto, Kouichi Yasuda, Takashi Uematsu, Kiyofumi FurusawaMatsumoto Dental University, School of Dentistry, Shiojiri, Nagano, JapanAbstract: Acute pericoronitis (AP) arises frequently in incompletely impacted mandibular third molars, but it remains unknown whether bone resorption in aging is associated with acute inflammation of the third molar. We conducted an experiment to compare the ratio of bone resorption to root length in the distal surface of the second molar (A), the proximal surface (B), and distal surface (C) in mesio-angular, incompletely impacted third molars in 27 young and 58 older adults with AP and 77 young and 79 older adults without a history of AP. Bone resorption in A, B, and C in older adults with AP demonstrated a significantly higher ratio when compared to those without AP, whereas there was no difference between those with and without AP in young adults except for B in women. However, there were no differences between bone resorption in B with AP in young and older women, and between bone resorption in C with AP in young and older adults. These indicate that AP and bone resorption are associated with incompletely impacted mandibular third molars in older adults.Keywords: bone resorption, pericoronitis, mandible, acute inflammation, elderly
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.