A STUDY ON TEE CROWN MORPHOLOGY IN HUMAN PERMANENT MOLARS AND THE SECOND MILK MOLARS : Second Part Crown Morphology in The Teeth of Lower Jaw

Background/Aim. Developmental disorders of teeth are the problems that are becoming more present in pediatric dentistry, especially on first permanent molars and incisors. Molar Incisor Hypomineralization (MIH) is proposed term for this phenomenon. The aim of this study was to establish the MIH prevalence in children living in the Foca municipality (Bosnia and Herzegovina) as well as to assess characteristics and expression of hypomineralization within the tested population. Methods. A total of 141 children from the Foca municipality, 8 years of age, were included in this study. Criteria according to Weerhejm have been used for diagnosis of hypomineralization: demarcated opacity (DO), post-eruptive breakdown (PEB), atypical restoration (AR), extracted molars due to MIH (E-MIH) and unerupted tooth (UT). Level and the prominence of color changes have been determined for patients with DO, PEB and AR. Results. MIH in this area was present in 12.8% of children. The prevalence of MIH changes expressed in percentages was as follows: DO was at 9.2%, PEB in 3.5%, AR in 5.6%, while E-MIH was 5.6%. A total of 9.9% of the examinees had mild, 5.6% moderate, and 7.8% severe form of MIH. White form of MIH defects was found in 9.9% of the examinees, white-yellow one in 5.6% and yellow-brown color in 3.5% of the examined children. These changes were more often present in the lower jaw (60.3%). In total, 6.4% of children had these changes present only on molars, while 6.4% of them both on molars and incisors simultaneously. Conclusion. A total of 12.8% of the examinees with MIH is not to be disregarded. With timely diagnosis, prevention and therapy complications could be avoided or mitigated.

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X-RAY ANALYSIS OF THE MANDIBLE IN PATIENTS WITH CROSSBITE AND MANDIBULAR DISPLACEMENT

Wiadomości Lekarskie ◽

10.36740/wlek201905207 ◽

2019 ◽

Vol 72 (5) ◽

pp. 993-996

Author(s):

Lyubov V. Smahlyuk ◽

Nelia V. Kulish ◽

Alevtyna M. Bilous ◽

Olena V. Luchko

Keyword(s):

Facial Asymmetry ◽

Masticatory Muscles ◽

Clear Correlation ◽

Aim Analysis ◽

Lower Jaw ◽

The Face ◽

Permanent Molars ◽

Ethics Commission ◽

First Permanent Molars ◽

Mandible Structure

Introduction: Significant morphological and aesthetic disabilities of the face, observed during the formation of a cross bite in combination with the displacement of the mandible, prompt the doctors – orthodontists to study carefully the morphogenesis of this anomaly. The aim: Analysis of the mandible structure in patients with a cross bite and lower jaw displac ement based on the analysis of orthopantomograms. Materials and methods: For this study, the orthodontic examination of 20 patients, 18-22 years old, was made they complained about facial asymmetry, displacement of the lower jaw and a violation of the cosmetic centers. A diagnosis of the buccal cross bite form in combination with the displacement of the lower jaw was put according to the Uzhumeckiene classification. The methods used do not contradict the conclusions of the ethics commission. Results: The analysis of the obtained data indicates that the angle of the mandible has more variable (p ≤ 0,05). Go120,8º and 125,1º. Significant of the angles of the canines according to the basal arch of the lower jaw of 102,8º and 105,4º (p≤0.01) and the angle of inclination of the first permanent molars of 89,6º and 91,4º, respectively (p≤0.01). Conclusions: The obtained data indicate that there is no clear correlation between changes in the studied parameters and the localization of anomalies (left-sided, right-sided). Indicators of the angle of the lower jaw are significantly altered from the opposite direction of its displacement. The change in the angles of inclination of the canine and the first permanent molars, as occlusive compensation, is determined reliably. The more the angle of the mandible changes, the more the lower jaw moves in the transversal direction. Perhaps this is due to the asymmetric tone of masticatory muscles.

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Morphological Differences between the First and Second Permanent Upper Molars

Journal of Morphological Sciences ◽

10.1055/s-0039-1695756 ◽

2019 ◽

Vol 36 (04) ◽

pp. 303-308 ◽

Cited By ~ 2

Author(s):

Luis Eduardo Genaro ◽

Gabriely Ferreira ◽

Marcelo Brito Conte ◽

Marcela de Almeida Gonçalves ◽

Ticiana Sidorenko Oliveira Capote

Keyword(s):

Type I ◽

Complex Structures ◽

Type Ii ◽

Anatomical Features ◽

Permanent Molars ◽

Crown Morphology ◽

Similarities And Differences ◽

School Of Dentistry ◽

Morphological Differences

AbstractThe dental elements present similar and specific anatomical features, depending on the functions they have in the oral cavity. The permanent molars are the most complex structures, mainly the occlusal face, due to their function of food grinding. The aim of the present article is to present the upper first and second molars morphology, emphasizing the similarities and differences between them. Besides, the upper first and second molars of the collection of the Department of Morphology of Universidade Estadual de Paulista (UNESP), School of Dentistry, Araraquara, were evaluated regarding the presence of the oblique ridge, frequency and classification of the molar tubercle, and the crown morphology (upper second molars). In the 372 evaluated upper first molars, the molar tubercle was absent in most of the teeth. When present, the molar tubercle belonged to the mesiolingual cusp; 8.9% were classified as type I; 9.1% as type II; and 9.4% as type III. The oblique ridge was present in all upper first molars. The morphology of 401 upper second molars was also evaluated; 64.83% were tetracuspid; 35.16% tricuspid; and 17.02% presented compression morphology. In 100 tricuspid teeth, 50% presented oblique ridge, with it being prominent in 30%. No upper second molars presented molar tubercle. Although there are similarities between the upper first and second molars, we must always be aware of the features that differ between them, so their functionality can be restored.

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Taurodontism in 47,XXY Males: An Effect of the Extra X Chromosome on Root Development

Journal of Dental Research ◽

10.1177/00220345880670021401 ◽

1988 ◽

Vol 67 (2) ◽

pp. 501-502 ◽

Cited By ~ 28

Author(s):

J. Varrela ◽

L. Alvesalo

Keyword(s):

X Chromosome ◽

Root Development ◽

Root Formation ◽

Population Sample ◽

Third Molars ◽

Lower Jaw ◽

Mandibular Molar ◽

Permanent Molars ◽

Males And Females ◽

Normal Males

Effects of an extra X chromosome on root development were studied in males with a 47, XXY chromosome constitution. Occurrence of taurodontism in the permanent molars of the lower jaw was noted from orthopantomograms of 30 Finnish 47,XXY males, 16 of their first-degree relatives, and a sample of 157 normal males and females. Nine, or 30%, or the 47, XXY males had at least one mandibular molar which was classified as taurodont. Only hypotaurodont teeth were found, and the teeth affected were all either second or third molars. None of the control relatives showed taurodontism. In the population sample, four individuals, or 2.5%, had taurodont teeth. A change in the mitotic activity of the cells of the developing teeth is one possible factor that can affect root formation leading to the development of taurodontism.

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A STUDY ON THE CROWN MORPHOLOGY IN HUMAN PERMANENT MOLARS AND THE SECOND MILK MOLARS : First Part Crown Morphology in the Teeth of Upper Jaw

The Journal of the Kyushu Dental Society ◽

10.2504/kds.14.435 ◽

1960 ◽

Vol 14 (3) ◽

pp. 435-454 ◽

Cited By ~ 2

Author(s):

Keiichi Ozumi

Keyword(s):

Permanent Molars ◽

Crown Morphology ◽

Upper Jaw

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STUDYING THE RISK FACTORS OF CARIES IN THE FIRST PERMANENT MOLARS IN CHILDREN DEPENDING ON THEIR ODONTOGLIFICS

Wiadomości Lekarskie ◽

10.36740/wlek202106134 ◽

2021 ◽

Vol 74 (6) ◽

pp. 1475-1477

Author(s):

Julia I. Soloshenko ◽

Lyudmila F. Kaskova ◽

Olena V. Khmil ◽

Lyudmila I. Amosova ◽

Liliia I. Lyashencko ◽

...

Keyword(s):

Preventive Measures ◽

Complex Structure ◽

Frequency Of Occurrence ◽

Surface Type ◽

Lower Jaw ◽

Study Results ◽

Permanent Molars ◽

Caries Lesions ◽

First Permanent Molars

The aim: To study the prevalence of odontoglyphic variants of the first permanent molars of the lower jaw in children 6-7 years old, as well as the frequency of caries lesions in molars with the most common types of patterns on their chewing surface. Materials and methods: We studied 1092 mandibular molars in 564 children without background pathology at the age of 6-7 years. The dynamics of the occurrence of fissure caries was studied in 347 first permanent molars of the lower jaw for 2 years and 246 molars in 155 children from among those observed during 3 years of the study. Results: In the children examined by us, the most common types of the chewing surface of the first permanent molars of the lower jaw were Y5- and + 5 patterns. We did not find a difference in the frequency of occurrence of these types in the surveyed girls and boys (p > 0.05). Our study showed that most often the first permanent molars of the lower jaw were affected by caries in the first 2 years of follow-up. The incidence of affection of the lower molars, which had a more complex structure of the occlusal surface (type Y5 and +5), was significantly higher than that of molars with the type of chewing surface +4. Conclusions: It has been established that in children 6-7 years old, the first permanent molars of the lower jaw have a more complex structure of the chewing surface, and the intensity of their caries damage is maximally high in the first two years after eruption and require active additional preventive measures in the early terms after their eruption. KEY WORDS: odontoglyphic, fissure caries, prevention, intertubercular fissures Wiad Lek. 2021;74(6):-

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ASSESSMENT OF THE PARAMETERS OF THE INTEROCCLUSION RELATIONSHIP IN THE PROCESS OF MESIALIZATION OF THE LOWER MOLARS WITH THE USE OF T-SCAN

Ukrainian Dental Almanac ◽

10.31718/2409-0255.2.2020.15 ◽

2020 ◽

pp. 97-102

Author(s):

V.S. Melnyk ◽

O.Yu. Rivis ◽

L.F. Horzov ◽

M.V. Rivis ◽

Yu.M. Bun

Keyword(s):

Orthodontic Treatment ◽

Study Groups ◽

Study Group ◽

Force Load ◽

Occlusal Force ◽

Mini Implants ◽

Lower Jaw ◽

Before And After ◽

Permanent Molars ◽

Occlusal Load

The aim of the study. Conduct a digital analysis of the distribution of relative force occlusal load in the area of the second permanent mandibular molars before and after their mesialization. Research methods. In order to evaluate the distribution of inter-occlusal force load in the process of mesialization of molars on the mandible, two clinical study groups were formed. The first group consisted of 32 persons (18 women / 56.25% and 14 men / 43.75%) aged from 18 to 25 years, who had orthodontic treatment using braces and mini-implants. The second group included 30 people (19 women / 63.33% and 11 men / 36.67%), orthodontic treatment was performed using a brace system without additional intraosseous support on the mini-implants. T-scan apparatus investigated the distribution of relative force occlusal load in the area of the second permanent mandibular molars before and after orthodontic intervention. Results of the study. The use of the T-scan apparatus is an accurate and informative tool for analyzing the distribution of functional occlusal force load within the dentition. During the analysis of the parameters of the chewing load in the area of the second permanent molars on the mandible before orthodontic treatment, an increase of this index was found in almost all patients of both study groups. In the first group in 4 (12.5%) persons the maximum relative occlusive force load in the area of the second permanent molars on the mandible was 10–20%, which is the range of the norm; in 15 (46.9%) cases this indicator was 20–30. %, in 10 (31.2%) patients had 30-40%, and in 3 (9.4%) exceeded 40%. In the second group, the parameters of the relative force occlusal load in the area of the second permanent molar on the mandible were as follows: in 5 (16.7%) persons in the range of 10-20%, in 13 (43.3%) persons - 20-30%, in 10 (33.3%) patients - 30-40% and in 2 (6.7%) patients more than 40%. After treatment, normalization of the relative occlusal force load was observed in the area of the second permanent molars on the lower jaw in the majority of patients of both study groups. In particular, in the first group in 21 (65.6%) persons the parameters of occlusal load were in the range of 10–20%, in 11 (34.4%) persons were 20–30%. In the second study group, 17 (56.7) patients observed parameters of the occlusal load on the second molar in the range of 10-20%, in 12 (40%) persons - 20-30% and in one (3.3%) patient 30-40%. In addition, moving molars involves changing the usual occlusal ratios associated with the non-identity factor in the shape and size of the first and second molars. At the same time, occlusal contacts on all other teeth are altered due to their alignment with the orthodontic equipment and the appearance of new contact points that did not interact before the start of treatment. Conclusions. The analysis of the distribution of the relative occlusal load in the area of the second permanent molars on the lower jaw with the help of T-scan after orthodontic treatment revealed the normalization of this indicator in the majority of patients in both study groups. Specifically, in the first group, 21 (65.6%) subjects had parameters of relative occlusal load within the range of 10–20%, and in 11 (34.4%) individuals were 20–30%. In the second study group, 17 (56.7%) patients were in the range of 10–20%, 12 (40%) patients - 20–30% and one (3.3%) patients 30–40%. The data obtained in both the first and second study groups indicate the need to perform procedures of grinding after orthodontic intervention to achieve appropriate occlusive normalization, the volume of which in each clinical situation is determined individually under the control of the T-scan apparatus.

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Successful radiation therapy for primary cutaneous follicle center lymphoma

Journal of Case Reports in Medicine ◽

10.25149/jcrm.v8i2.198 ◽

2019 ◽

Vol 8 (2) ◽

Author(s):

Takashi Matsushita ◽

Tomoyasu Kumano ◽

Kazuhiko Takehara

Keyword(s):

Radiation Therapy ◽

Skin Biopsy ◽

B Cell ◽

B Cell Lymphomas ◽

Solitary Lesion ◽

Lower Jaw ◽

First Choice ◽

The Right

Primary cutaneous follicle center lymphoma (PCFCL) accounts for the majority of primary cutaneous B-cell lymphomas. We report a 60-year-old womanwith PCFCL. She had a red nodule (25 × 25 mm) on the right side of the lower jaw. She was diagnosed with PCFCL by skin biopsy. And then, she was treated with radiation therapy (total 30.6 Gy), which completely eliminated the nodule. Our case suggests that radiation therapy may be a first choice for PCFCL patients with a solitary lesion or localized lesions.

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