Lower Deciduous Molar Research Articles

An innovative therapeutic alternative for correcting the direction of eruption of a lower mandibular cuspid: A mixed dentition case report

The use of miniscrews (MSs) as temporary anchorage devices in orthodontics has gained increased attention among researchers in recent years. However, these screws are usually used in permanent dentition. This case report discusses a patient for which an MS was used. An 11-year-old male with mixed dentition presented an ectopic eruption in his mandibular right canine had ectopic eruption. This altered pattern of eruption was corrected using surgical exposure and orthodontic traction with an elastic chain, assisted by a 2 mm × 10 mm interradicular MS placed between the patient's first and second lower deciduous molars. After 5 months with this traction, the patient's right lower cuspid ectopic guide was corrected. This use of an interradicular MS in mixed dentition was found to be both useful and safe.

Reassessment of the cranial and dental data from the Upper Paleolithic site of Kostenki 15

In the article we present new results of the study of the child skull found in a burial at the Upper Paleolithic site of Kostenki 15 (Gorodtsov site). While the CT analysis of the earlier reconstructed skull revealed high level of destruction of the morphologically important landmarks which prevents from using the conventional cranial metric characteristics of the individual in population studies, the analysis of its dental morphology was shown to be much more informative. Our study revealed that the upper incisors and lower molars of the sample display a specific complex of non-metric traits which combine European (4-cusped first molars) traits with such Asian characteristics as shovel-shaped upper lateral incisors, odontoglyphic patterns on the first lower molars, and morphology of the second lower deciduous molars. The results of the statistical analysis of the dental metrics does not match with the hypothesis on close biological affinities of the Kostenki 15 child with Předmostí and Dolní Věstonice populations put forward by Yakimov but again revealed intermediate European-Asian position of the Kostenki 15 sample. Several European samples including those from the Pavlov, Cap Blanc and Grotte de la Balauzière sites and one Siberian sample from the Malta settlement demonstrate the highest level of similarity with the Kostenki 15. Apparently, it can be argued that the results of our study suggest long distance migrations in Eurasia as early as the Upper Paleolithic.

Multidisciplinary oral rehabilitation of an adolescent suffering from juvenile Gorlin-Goltz syndrome \u2013 a case report

BackgroundThe Gorlin-Goltz syndrome is an autosomal dominant disorder characterized by keratocystic odontogenic tumors in the jaws, multiple basal cell carcinomas and skeletal abnormities. Frequently, the manifestation of the syndrome occurs in the adolescent years.Case presentationAn 11-year-old boy was referred to our clinic due to the persistence of the lower deciduous molars. The further diagnosis revealed bilateral keratocystic odontogenic tumors in the region of teeth 33 and 45 representing a symptom of a Gorlin-Goltz syndrome. This case of the oral rehabilitation of an adolescent with bilateral keratocystic odontogenic tumors shows the approach of a multidisciplinary treatment concept including the following elements: Enucleation and bone defect augmentation using a prefabricated bone graft; distraction osteogenesis to extend the graft-block vertically after cessation of growth; accompanying orthodontic treatment, guided implant placement and prosthetic rehabilitation. Six months after implant insertion, a new keratocystic odontogenic tumor in the basal part of the left sinus maxillaris had to be removed combined with the closure of the oroantral fistula. During the follow-up period of 18 months in semi-annual intervals, the patient showed no sign of pathology.ConclusionIn the presented case could be shown that distraction osteogenesis of prefabricated bone blocks is possible. With a multidisciplinary approach in a long-term treatment a sufficient oral rehabilitation of the patient suffering from extended keratocystic odontogenic tumors was possible.

Human teeth from securely stratified Middle Stone Age contexts at Sibudu, South Africa

The fossil record of early Homo sapiens in the African Pleistocene remains sparse. In contrast to its prominent position regarding the cultural evolution of our species, southern Africa plays a secondary role in narratives regarding human biological origins. Reasons for this are a limited and fragmentary fossil record from the Middle Stone Age (MSA), further complicated by a number of human remains coming from contexts lacking chronostratigraphic information. Similar to the southern African MSA overall, the rich archeological deposits of Sibudu stand in opposition to its scarce record of hominin fossils. Here, we report on three human teeth (SIB-1, 2, 3) from securely stratified MSA deposits at Sibudu dating between > 77 and 64 ka. The teeth include two lower deciduous molars (Ldm2) with heavy occlusal wear and one fragment. We focus on describing the find and archeological context, followed by an initial assessment of the fossils and their contextualization within the African record. The juvenile teeth derive from rich and well-stratified archeological deposits, associated with a Howiesons Poort industry at ~ 64 ka from PGS3 (SIB-3) and pre-Still Bay occupations in strata Casper and Danny at > 77 ka (SIB-1, 2). The latter constitute the oldest human fossils from Sibudu. Metric and morphological analyses of the Ldm2s (SIB-2, 3) find a combination of archaic traits (e.g., mid-trigonid crest) and crown dimensions that overlap with ranges of both Pleistocene and recent Homo sapiens. These results match with a population of Homo sapiens that lies chronologically between the earliest members of the species and recent humans.

2011 Dahlberg Award Winner Evaluation of the utility of deciduous molar morphological variation in great ape phylogenetic analysis

Non-metric dental traits are well-established tools for anthropologists investigating population affiliation and movement in humans. Nonetheless, similar traits in the great apes have received considerably less attention. The present study provides data on non-metric trait variability in the deciduous molars of great apes from museum context. Twenty-eight traits are observed in the upper and lower deciduous molars in specimens of Pan troglodytes, Pan paniscus, Gorilla gorilla, and Gorilla beringei. These groups are compared based on trait frequencies and mean measures of divergence. This study demonstrates the variability of non-metric traits in the deciduous molars of chimpanzees and gorillas. These traits could potentially be used in the same way that non-metric traits are in humans, namely group affiliation and population movements through time. Further, this study establishes scoring guidelines and methodology relevant to deciduous dental morphological characteristics found in the great apes, but not necessarily in humans.

Erupted rootless type III dense in dente (dilated odontoma) masquerading as peripheral gingival pathosis

Dense in dente, also known as dense invaginatus or dilated odontoma, is a developed malformed tooth and usually does not pose a diagnostic challenge. Described here is a unique case in which a rootless type III dense in dente (dilated odontoma) between the lower deciduous molars in a 2-year-old girl emerged through the gingiva mimicking a peripheral developing odontoma. At the time of examination, neither anchored in bone nor associated with an underlying un-erupted tooth. The small size, the superficial position in the growing mandible, the absence of the overlying bone and the physiologic eruptive movement of the neighbouring teeth may predispose the present rootless dense in dente to erupt in the gingiva.

The Lower Second Deciduous Molar

Abstract No Abstract Available. Read before the Eastern component of the Angle Society, 1962.

Predicting pain in children with carious primary teeth

Objective To provide a pain-predictive model for the non-operative management of carious deciduous teeth from the analysis of data from a retrospective analysis of clinical case notes of children regularly attending two general dental practices and receiving preventive care. Design A clearly defined protocol was used to determine the fate of deciduous teeth diagnosed as carious into dentine but symptomless and left unrestored from the sequential examination of the clinical records of 480 children attending at least annually. Results The age of the children at the first visit when carious teeth were diagnosed ranged from 0.8 to 12.3 years, with the majority of children (243/480) presenting by 6 years of age. In all, 250 teeth from 162 children were extracted because of pain or became painful and were treated. The remaining 318 children did not report pain on subsequent visits. The strongest predictor of pain was age on diagnosis, the other factors being tooth type and extent of the cavity when first seen. Data from the present study provides a model that enables a child with deciduous caries to be placed into one of six pain-predictive groups associated with a risk of pain or infection if the teeth are not restored but provided with preventive care only. Conclusion In these patients, the majority of unrestored carious deciduous teeth remain symptomless until shed. A higher risk of subsequent pain or infection was associated with the development of caries in younger patients, disease extending beyond single surfaces, and disease in lower deciduous molars. The results provide evidence to aid the treatment planning of carious deciduous teeth in children receiving regular preventive dental care.

Pain prediction for preventive non-operative management of dentinal caries in primary teeth in general dental practice.

To provide a pain-predictive model for the non-operative management of carious deciduous teeth from the analysis of data from a retrospective analysis of clinical case notes of children regularly attending two general dental practices and receiving preventive care. A clearly defined protocol was used to determine the fate of deciduous teeth diagnosed as carious into dentine but symptomless and left unrestored from the sequential examination of the clinical records of 480 children attending at least annually. The age of the children at the first visit when carious teeth were diagnosed ranged from 008 to 12.3 years, with the majority of children (243/480) presenting by 6 years of age. In all, 250 teeth from 162 children were extracted because of pain or became painful and were treated. The remaining 318 children did not report pain on subsequent visits. The strongest predictor of pain was age on diagnosis, the other factors being tooth type and extent of the cavity when first seen. Data from the present study provides a model that enables a child with deciduous caries to be placed into one of six pain-predictive groups associated with a risk of pain or infection if the teeth are not restored but provided with preventive care only. In these patients, the majority of unrestored carious deciduous teeth remain symptomless until shed. A higher risk of subsequent pain or infection was associated with the development of caries in younger patients, disease extending beyond single surfaces, and disease in lower deciduous molars. The results provide evidence to aid the treatment planning of carious deciduous teeth in children receiving regular preventive dental care.

乳臼歯に起因するろ胞性歯嚢胞の１例

Follicular cysts are frequently associated with a permanent tooth in the jaws, but rarely arise from deciduous teeth.We report on a 4-year-old boy with a follicular cyst of the second lower deciduous molar.On radiographic examination, an ovoid radiolucent area including a radiopaque mass considered to be the second deciduous molar was noted in the right mandibular region.The clinical diagnosis was a follicular cyst associated with the second lower deciduous molar, and the cyst and the second lower deciduous molar were removed.The final diagnosis was a follicular cyst originating from the second lower deciduous molar.

生後５か月の乳児に発生した乳臼歯ろ胞性歯嚢胞の１症例

A follicular cyst associated with a permanent tooth in the region of the jaws, is frequently encountered, but one originated from deciduous tooth is very rare.We presented a case of a 5-month-old infant with a follicular cyst of the first deciduous molar. The patient visited our hospital because of gingival swelling in the deciduous molar region of the left mandible on 7th May 1983.A hard bone like swelling (25×15×20mm) was seen from the gingiva of the left lower deciduous molar region to the left mandibular body, and in CT examination, an ovoid low density area was noticed in proximally contact with the high density mass considered to be the first deciduous molar in the left mandibular region. On the basis of clinical diagnosis of follicular cyst related with the first lower deciduous molar, marsupialization of the cyst was carried out under general anesthesia with Gas-Oxygen-Enflurance on 27 th May 1983.Histologically the cyst lining mainly consisted of cuboidal or squamous epithelium of mono-or double layer in major portion, and high coumnar epithelia were also observed both in the inner lining components and in the subconnective cyst wall.The final diagnosis was determined as follicular cyst from the first lower deciduous molar. The first deciduous molar with enamel hypoplasia erupted about one year later.

Cartesian Coordinate Analysis of the Hominoid Second Lower Deciduous Molar

Cartesian Coordinate Analysis of the Hominoid Second Lower Deciduous Molar

下顎乳臼歯の原始的形質に関する研究

下顎乳臼歯の原始的形質に関する研究

Growth of the human second lower deciduous molar

A biometric study of 99 germs of dm 2 extracted from foetuses of ages ranging from 12 weeks to term, using a similar method to that previously applied to dm 2, showed that the growth patterns of the two teeth were similar. However, it was found that if, instead of assuming allometry, the data were plotted directly without logarithmic conversion, many of the changes previously ascribed to an interphase are eliminated. The results are consistent with the view that tooth growth is additive rather than exponential, different parts of the tooth starting to grow at different times. After calcification of the first cusp (about 20 weeks), the relative size of the root openings becomes reduced, the cusps tilt apart and total growth decelerates progressively and not suddenly.

An alternative interpretation of the supposed giant deciduous hominid tooth from Olduvai.

DR. L. S. B. LEAKEY has reported1,2 the discovery at Olduvai of what he regards as a large second lower deciduous molar of a hominid exhibiting affinities with Sinanthropus and the Heidelberg jaw, but not with australopithecines. Associated with it was a worn deciduous canine. The purpose of this communication is to show that the molar is, in fact, a permanent upper tooth, probably of an australopithecine.