The fate of teeth in mandibular fracture lines
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Keywords:
Interdental consonant
Mandibular fracture
The dental pulp is a complex organ with various functions that are reflected by its morphology. The angioarchitecture and nerve supply of deciduous and permanent teeth resemble one another. The morphologies of the pulp of deciduous and permanent teeth are similar, but some distinct differences can be found. The odontoblastic layer in deciduous teeth is thinner than in permanent teeth, which may reflect a reduced regenerative capacity. In deciduous teeth, many immature dental pulp stem cells can be isolated. The main difference in the biology of the pulp between deciduous and permanent teeth is that the lifetime of deciduous teeth is rather limited. Under the influence of the developing permanent tooth, odontoclasts differentiate and resorb root dentin. Pulp tissue is also resorbed. In permanent teeth, dental hard tissue and pulp tissue are only resorbed under pathologic conditions.
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Background and objectives: Impacted lower third molar has been blamed for lower incisor crowding. The aim of this study was to measure the amount of pressure exerted by lower third molar. Method: The study was conducted on 62 patients who underwent surgical removal of impacted lower third molars. The mean age of the subjects was 25.4 years with a range of 18-37 years. Interdental frictional strength was measured between posterior teeth, before and one week after lower third molar removal, using 0.05 mm stainless steel strip and digital force gauge. Results: No significant difference was noted in interdental frictional strength before and after lower third molar removal. The depth of impacted lower third molar and proximity of impacted tooth to the adjacent second molar has no significant influence on the interdental frictional strength. Conclusion: Impacted lower third molar does not exert any significant force on the teeth and should not cause lower incisor crowding.
Interdental consonant
Crowding
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Delayed eruption of the first permanent molar (M1) is a relatively rare finding. This report describes the occurrence of delayed development and eruption of a single M1 in Japanese child patients.Cases were identified by surveying 353 orthopantomograms taken of child patients attending a Dental Hospital. Dental age, crown morphology and the presence of third permanent molars (M3) were determined from radiographs and clinical examination.Osaka University Dental Hospital in Japan.Nine cases were identified from radiographs. The occlusal morphology of the affected molars showed a reduction of the distolingual cusp. Dental ages correlated more closely to chronological ages when the affected teeth were assumed to be second permanent molars (M2) than they did when the teeth were assumed to be M1. M3 proximate to the affected molar was congenitally absent in the orthopantomograms of all affected subjects.It is suggested that in the cases seen here the affected teeth were likely to have been second permanent molars that had migrated mesially in association with the congenital absence of M1, although congenital absence of M1 has been reported to be extremely rare.
Tooth eruption
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To evaluate the therapeutic efficacy of mandibular fracture treatment with combined interdental ligation with minimally invasive expansive compression screws.One hundred and sixty-eight patients received this treatment modality. The length of intraoral incision was 3-4 cm. An expansive compression screw was inserted and fixed on the fracture line, and two to three teeth anterior and posterior to the fracture line were ligated.The minimally invasive technique and expansive compression screw supplied continuous pressure with less periosteum stripping. This method led to direct fracture union rather than secondary fracture healing with callus formation.Combined interdental ligation with minimally invasive expansive compression screw the mandible fracture is easier to carry out than traditional treatment. This technique makes the patient suffer from less pain, with faster fracture healing and no sequela.
Interdental consonant
Mandibular fracture
Expansive
Mandible (arthropod mouthpart)
Expansive clay
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The mandibular fracture repair was done in 17-dogs, which were divided into three groups with five animals in group I and six animals each in group II and III. Three different techniques viz., interdental wiring, titanium mini plate fixation and gentamicin impregnated PMMA plate fixation were evaluated in these groups. The fracture site was most commonly located between 2nd and 3rd premolars followed by 3rd and 4th premolars on either side. Full free use of mandible on 2nd day onwards was observed in plated animals and it was observed by 7th day in animals treated with interdental wiring. The radiographic evaluation showed that fractures treated by PMMA plates healed by osteosynthesis, those treated with titanium mini plate healed by callus formation, and the animals treated with interdental wiring showed the problem of malocclusion and wire loosening and two animals showed uneventful recovery.
Interdental consonant
Mandibular fracture
Osteosynthesis
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Objective To report the causes and classification of mandibular fractures in dromedary camels and outcome after treatment. Animals Single‐humped camels (n = 116) with mandibular fracture. Methods At admission, cause, site, classification, and radiography of mandibular fractures were recorded. Factors affecting fracture healing were analyzed. Results Biting was the main cause of mandibular fractures in camels, which occurred more commonly in older males ( P = .001) than in females. Open fractures were more common than closed ones (92.2% versus 7.8%, P = .0001) and single fractures were more frequent (82%) than multiple and comminuted fractures (18%; P = .001). Fractures were treated by interdental wiring (91.2%) or U‐shaped aluminum bar (8.8%) and healing occurred in most (83.2%) fractures. Conclusions In dromedary camels, mandibular fracture is most commonly caused by bites and can be successfully repaired by interdental wiring or a U‐bar technique with good outcome.
Interdental consonant
Mandibular fracture
Biting
Mandible (arthropod mouthpart)
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Aim. To evaluate the applicability of pit and fissure sealing on the first permanent molars in young
schoolchildren according to the status of the occlusal surface of these teeth at the moment of the first visit
to the Pedodontics Department.
Materials and methods. The study group consisted of 126 children (62 boys) aged 6 to 9 years (8.02 ± 1.01).
The initial status (sound / stained pits and fissures / decayed or filled) of the occlusal surface of 501 first
permanent molars was recorded.
Results. 46.03% of the children had all occlusal surfaces of their first permanent molars caries-free.
63.46% of the studied molars had sound occlusal surfaces where a pit and fissure sealant could be applied
if needed. 9.78% had stained pits and fissures while 26.75 % had dentin caries, either treated or untreated.
Girls have significantly more decayed/filled occlusal surfaces on first permanent molars than boys
(27.45% versus 24.39%, p=0.05).
Conclusions. Early carious involvement of the first permanent molar represents a serious restraint for the
applicability of pit and fissure sealants even a short time after eruption. Early dental visits can increase
the possibilities of applying preventive measures on this tooth.
Paediatric dentistry
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Objective: To evaluate the prevalence of caries in second molar deciduous molar and adjacent first permanent molar in children. Study Design: Cross Sectional study. Setting: Dental Outdoor Department of Ibn-e-Siena Hospital. Period: March 2021 to August 2021. Material & Methods: A total of 1,250 patients between the age of 6-12 years were included in the study, who were free from the other dental issues. Consent was taken from the patients and parents after explaining the procedures. Examination was done by a senior Operative dentist. For diagnosis of the caries ICDAS criteria was undertook Results: A total of 1250 children between the age of 6-12 years were included in the study. Out of these 250 children had first permanent molar caries. Boys were effected more and second deciduous molar tooth caries were associated with development of caries first permanent molars as these are closely placed. Conclusion: Association between presence of caries in primary teeth is correlated with the development of caries in the permanent teeth. So caries in the primary teeth, predicts the development of caries in the permanent teeth.
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We hypothesized that the six-monthly application of silver diamine fluoride (SDF) can arrest the development of caries in the deciduous dentition of six-year-old schoolchildren and prevent caries in their first permanent molars. A prospective controlled clinical trial was conducted on the efficacy of a 38% SDF solution for caries reduction. Four hundred and twenty-five six-year-old children were divided into two groups: One group received SDF solution in primary canines and molars and first permanent molars every 6 mos for 36 mos. The second group served as controls. The 36-month follow-up was completed by 373 children. The mean number of new decayed surfaces appearing in primary teeth during the study was 0.29 in the SDF group vs. 1.43 in controls. The mean of new decayed surfaces in first permanent molars was 0.37 in the SDF group vs. 1.06 in controls. The SDF solution was found to be effective for caries reduction in primary teeth and first permanent molars in schoolchildren.
Permanent dentition
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AIM: To observe the electric pulp testing scores of permanent anterior teeth in children and study the relationship of the scores to the root development. METHODS: Digital Technology automatic pulp vitality tester was used to detect 256 permanent anterior teeth of children,and the scores were compared with the X-ray films of the teeth. RESULTS: For the underdeveloped permanent anterior teeth,there was no or a retarded pulp vitality score;and for the teeth which had developed completely in root,the pulp vitality score was usually normal;and the normal-reacted teeth number was increased with the root development. CONCLUSION: The permanent anterior teeth pulp vitality scores in children was related with the root developmental condition,and for the underdeveloped permanent teeth,the pulp vitality test score could not reveal the true condition of pulp vitality.
Vitality
Anterior teeth
Permanent tooth
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