Impactação dentária de caninos permanentes - consequências e relação com ortopedia funcional dos maxilares

Clinical experience and knowledge of normal growth and development of children, as well as radiographic studies of the dental eruption evolution, are important to supervise the maxillary permanent canine eruption. Clinical observations of signs and symptons such as digital palpation of the permanent canine bulges above the primary canine apex, on children of about nine years old, is a very important step for the diagnosis of ectopic eruption. Dentist may find more help with the early diagnosis, to avoid complications that are not so frequent to happen, but are still a burden such as traction and adjacent root tooth resorption.

Hereditary gingival fibromatosis: A Case Report.

Introduction: Hereditary gingival fibromatosis is a rare disorder with a genetic component that may appear during tooth replacement. This condition can cause functional and aesthetic pro-blems such as malocclusions, diastemas, pain when chewing, dental caries, periodontal disease, delayed eruption, among others. Objective: To report the multidisciplinary treatment provided to a patient with hereditary gingival fibromatosis. Case Report: This report describes the treatment carried out in a thirteen-year-old male patient presenting generalized increase in gingival volume associated with functional and aesthetic compromise and delayed eruption of permanent teeth. After diagnosis, a multidisciplinary intervention was proposed, involving perio-dontal and pediatric dentistry procedures, which improved the quality of life of the patient both functionally and aesthetically. Conclusion: Hereditary gingival fibromatosis not only affects the dental eruption process, but also causes aesthetic and emotional alterations in the patient. The periodontal procedures significantly im-proved the appearance, function, and the psychological state of the patient.

Variation in Ontogenetic Facial Suture Fusion Patterns in Catarrhines

Timing of craniofacial suture fusion is important for the determination of demographics and primate ontogeny. There has been much work concerning the timing of fusion of calvarial sutures over the last century, but little comprehensive work focusing on facial sutures. Here we assess the relationships of facial suture fusion across ontogeny among select catarrhines. Fusion timing patterns for 5 facial sutures were examined in 1,599 crania of <i>Homo</i>, <i>Pan</i>, <i>Gorilla</i>, <i>Pongo</i>, Hylobatidae, <i>Papio</i>, and <i>Macaca</i>. Calvarial volume (early ontogeny) and dental eruption (late ontogeny) were used as indicators of stage of development. General linear models, test for homogeneity of slopes, and ANOVA were used to determine differences in timing of fusion by taxon. For calvarial volume, taxonomic groups segregated by regression slopes, with models for <i>Homo</i> indicating sutural fusion throughout ontogeny, <i>Pongo</i>, <i>Macaca</i>, and <i>Papio</i> representing earlier and more complete suture fusion, and <i>Pan</i>, <i>Gorilla</i>, and Hylobatidae indicating very early facial suture fusion. Similar patterns are observed when dental eruption is used for developmental staging. Only <i>Gorilla</i> and Hylobatidae are observed to, generally, fuse all facial suture sites in adulthood. Finally, <i>Homo</i> appears to be unique in its delay and patency of sutures into late ontogeny. The taxonomic patterns of facial suture closure identified in this study likely reflect important evolutionary shifts in facial growth and development in catarrhines.

Ectopic Eruption of Maxillary First Permanent Molars: Preliminary Results of Prevalence and Dentoskeletal Characteristics in Spanish Paediatric Population

The ectopic eruption of the maxillary first permanent molar (EEM) is a local alteration of dental eruption with a multifactorial aetiology. The aims of our study were to determine the prevalence of the EEM in children and to analyse whether there is a relationship between EEM and dento-skeletal characteristics. A total of 322 children were analysed with the Ricketts cephalometric study and descriptive and analytical statistical analysis was carried out. The prevalence of EEM was 8.7%, with no statistically significant differences regarding gender or location, but a higher prevalence in the 7-year-old age group (18.8%) and bilateral EEM was more prevalent than unilateral EEM (p < 0.05). The most frequent findings were a shortened anterior cranial base, a retroposition of the maxilla and a distal position of the upper permanent first molar in relation to the pterygoid vertical in children with EEM. No statistically significant differences were found regarding the cephalometric parameters except a decreased palatal plane in the bilateral EEM group and a distal upper incisor position in the EEM group (p < 0.05). In conclusion, the prevalence of the EEM was 8.7%, more frequently bilateral, and significantly in seven-year-old patients. Children with bilateral EEM have decreased palatal plane values and a more posterior position of the upper incisor.

Deciduous dentition and dental eruption sequence in Interatheriinae (Notoungulata, Interatheriidae): implications in the systematics of the group

Studies focused on deciduous dentition, ontogenetic series, and tooth eruption and replacement patterns in fossil mammals have lately increased due to the recognized taxonomic and phylogenetic weight of these aspects. A study of the deciduous and permanent dentition of Interatherium and Protypotherium (Interatheriinae) is presented, based mainly on unpublished materials. Deciduous cheek teeth are brachydont and placed covering the apex of the respective permanent tooth; in addition, some morphological and metrical differences are observed along the crown height. Five dental ontogenetic stages are distinguished among the juvenile specimens on the basis of the degree of wear, the replacement of the deciduous premolars, and the eruption of the molars. The crown height and the wear degree of different Interatheriinae taxa show: (1) eruption pattern of molars in an anterior–posterior direction (M/m1 to M/m3); (2) pattern of replacement of deciduous premolars and eruption of permanent premolars in a posterior–anterior direction (dP/dp4 to dP/dp2 and P/p4 to P/p2); and (3) eruption of M/m3 before the replacement of dP/dp4. Results allow evaluating the diagnostic dental characteristics used to describe some interatheriines, as well as reinterpreting some taxonomic assumptions: the holotype of Protypotherium diversidens Ameghino, 1891 is recognized as a juvenile of another species of the genus, and the species is not validated, considering it as Protypotherium sp.; the holotype of Eudiastatus lingulatus Ameghino, 1891 falls in the variability of Protypotherium, becoming P. lingulatus new combination, tentatively maintaining the species and implying the synonymy between Eudiastatus and Protypotherium; and the holotype of Eopachyrucos ranchoverdensis Reguero, Ubilla, and Perea, 2003 is reinterpreted as bearing deciduous premolars.

The Eruption Patterns of The Teeth of Nigerian Local Pigs. Part 1: Profile of Deciduous Teeth

Background: The pigs, domesticated about 6000 years ago, are highly prolific omnivores belonging to the Family Suidae and Order artiodactyla along with their other hooved counterparts. They qualify as models for various translational research studies (including dental studies) because of their anatomical and physiological similarities to humans. There is however a dearth of information as regards the deciduous dental eruption profile (sequence and timing of eruption) of the Nigerian local pigs (NLP). This study was designed to determine the deciduous eruption profile in the NLP to assist in the management of the breed and in a bid to making the NLP more obvious as suitable animal models in dental research. A total of 51 healthy piglets (from postnatal day 1) were used for this. Their oral cavities were examined every other day for 29 weeks for signs of dental eruption. Looking at Mandibular (Md) and Maxillar (Mx) eruptions for Incisors (I), Canines(C), Premolars (P) and Molars (M), the modular sequence in the NIP was Md/ Mx I3(at birth), C (at birth) →Md I1→Md P3→MxP3 →MxI1 → Md I2 →MdP4 →MxP4 →MxP2→ Md I2 →MxI2 . Result: It was observed that variations in eruption timing exist amongst individuals and sexes while variation in eruption sequence exists between NLP and various breeds of pigs based on the literature.Conclusion: The results of this study will be particularly important to farmers, and researchers into NLP especially those using pigs in Nigeria as a model for translation research.

Decompression and enucleation of a large dentigerous cyst in the mandible angle – a case report

Dentigerous cyst is the most prevalent lesion of odontogenic origin, commonly radiographically diagnosed, between the second and fourth decades of life, with a predilection for the male sex. The treatment of choice is enucleation; however, decompression is indicated for cysts that reach large proportions. The most frequent complications are expansion and resorption of the bone cortex, facial asymmetry, root resorption of adjacent teeth, migration or delay of dental eruption and compression of the lower alveolar nerve canal. Objective: To report a clinical case of a dentigerous cyst adjacent to an impacted mandibular third molar, treated with decompression and enucleation. Case report: A 39-year-old male, attended the Stomatology service with a history of a radiographic finding in the mandible. At the radiopraghic evaluation, it was possible to observe a radiolucent unilocular cystic tumor lesion, well delimited by a radiopaque, asymptomatic, intraosseous image in the region of the mandible right angle, extending from the left first pre molar to the left third molar, with the later included in a mesioangular position. The patient underwent a previous cystic decompression process, followed up regularly for 6 months, and referred for endodontic treatment of the left first and second molars to prepare for surgical enucleation and removal of the third molar. After removal, the material was sent to anatomopathological analysis, and the results confirmed the diagnosis of dentigerous cyst. The patient is being followed up without postoperative comorbidities. Conclusion: The chosen treatment allowed the maintenance of the teeth involved in the lesion, and mainly, the minimization of the enucleation procedure by previous decompression.

Evidence of Dental Lamina Preservation in the Development of Mice First Molars

The aim of this work was to analyse the behaviour of the dental lamina during the development process of first molar teeth. The offspring of female mice were analysed at the 16th day of intra-uterine life and since birth till 17 days old with the aim to evaluate the dental lamina evolution of upper and lower first molars. The animals were sacrificed, and the heads embedded in paraffin in order to get frontal or sagittal sections whose were stained by hematoxylin and eosin method. The results showed a very clear presence of the dental lamina in all periods under analysis, without the occurrence of its disorganization, in other words, it was permanently connecting the developing tooth germ to the oral epithelium until advanced dental eruption.

In vivo deciduous dental eruption in LuiKotale bonobos and Gombe chimpanzees

Existing data on bonobo and chimpanzee dental eruption timing are derived predominantly from captive individuals or deceased wild individuals. However, recent advances in noninvasive photographic monitoring of living, wild apes have greatly expanded our knowledge of chimpanzee dental eruption in relatively healthy individuals under naturalistic conditions. We employ similar methods to expand on this knowledge by reporting deciduous dental eruption ages in living, wild bonobos and chimpanzees from LuiKotale, Democratic Republic of the Congo and Gombe National Park, Tanzania, respectively. Deciduous dental eruption ages in our sample generally fall within the range of variation previously documented for captive chimpanzees. We also found substantial variation in deciduous canine eruption timing, particularly among bonobos. One bonobo had a deciduous canine present by 227 days old while another did not have a deciduous canine present at 477 days old. As more data accumulate from these populations, future studies should consider sources of variation in deciduous canine eruption timing and relationships with other aspects of life history.