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The Anatomical Record Jun 1996The mechanisms of tooth eruption (i.e., the answer to the question of how and why teeth erupt) has been a matter of long historical debate. This review focuses on human... (Review)
Review
The mechanisms of tooth eruption (i.e., the answer to the question of how and why teeth erupt) has been a matter of long historical debate. This review focuses on human and other mammalian teeth with a time- and spacewise limited period of eruption and analyzes recent observations and experimental data on dogs, rats, primates, and humans in a framework of basic biological parameters to formulate a guiding theory of tooth eruption. Acknowledging basic parameters (i.e., that teeth move in three-dimensional space, erupt with varying speed, and arrive at a functional position that in inheritable) eliminates a number of previously held theories and favors those that accommodate basic parameters, such as alveolar bone remodeling in association with root elongation, with possible correction factors in the form of cementum apposition and periodontal ligament formation. We have critically analyzed, summarized, and integrated recent findings associated with preeruptive movements of developing teeth, the intraosseous stage of premolar eruption in dogs, molar eruption in rodents, and premolar and molar eruption in primates. The variable speeds of eruption are particularly important. We conclude with basic principles of tooth eruption--that is, the type of signals generated by the dental follicle proper, the conditions under which teeth are moved and the clinical understanding to be derived from this knowledge.
Topics: Animals; Dogs; Humans; Molar; Natal Teeth; Primates; Rodentia; Species Specificity; Tooth Eruption; Tooth Migration; Tooth Root
PubMed: 8769674
DOI: 10.1002/(SICI)1097-0185(199606)245:2<374::AID-AR18>3.0.CO;2-M -
Children (Basel, Switzerland) May 2021Analyze defects in the state of maturation of the enamel result in an adequate volume of enamel, but in an insufficient mineralization, which can affect both deciduous... (Review)
Review
Assessment of Genetical, Pre, Peri and Post Natal Risk Factors of Deciduous Molar Hypomineralization (DMH), Hypomineralized Second Primary Molar (HSPM) and Molar Incisor Hypomineralization (MIH): A Narrative Review.
OBJECTIVES
Analyze defects in the state of maturation of the enamel result in an adequate volume of enamel, but in an insufficient mineralization, which can affect both deciduous teeth and permanent teeth. Among the most common defects, we recognize Deciduous Molar Hypominerlization (DMH), Hypomineralized Second Primary Molar (HSPM), and Molar Incisor Hypomineralization (MIH). These, in fact, affect the first deciduous molars, the second deciduous molars and molars, and permanent incisors, respectively, but their etiology remains unclear. The objective of the paper is to review studies that focus on investigating possible associations between genetic factors or prenatal, perinatal, and postnatal causes and these enamel defects.
MATERIALS AND METHODS
A comprehensive and bibliometric search for publications until January 2021 was conducted. The research question was formulated following the Population, Intervention, Comparison, Outcome strategy. Case-control, cross-sectional, cohort studies, and clinical trials investigating genetic and environmental etiological factors of enamel defects were included.
RESULTS
Twenty-five articles are included. For genetic factors, there is a statistical relevance for SNPs expressed in the secretion or maturation stage of amelogenesis (16% of studies and 80% of studies that investigated these factors). For prenatal, perinatal, and postnatal causes, there is a statistical relevance for postnatal factors, such as the breastfeeding period (2%), asthma (16%), high fever episodes (20%), infections/illnesses (20%), chickenpox (12%), antibiotic intake (8%), diarrhea (4%), and pneumonia (4%).
CONCLUSIONS
The results are in agreement with the multifactorial idea of the dental enamel defects etiology, but to prove this, further studies enrolling larger, well-diagnosed, and different ethnic populations are necessary to expand the investigation of the genetic and environmental factors that might influence the occurrence of DMH, HPSM, and MIH.
PubMed: 34064138
DOI: 10.3390/children8060432 -
Children (Basel, Switzerland) Apr 2022The objective of this study was to characterize natal and neonatal teeth using micro-computed tomography. A total of 4 natal and 11 neonatal teeth were used for the...
The objective of this study was to characterize natal and neonatal teeth using micro-computed tomography. A total of 4 natal and 11 neonatal teeth were used for the analysis. The reconstructed scans were assessed for the maximum enamel/dentin thickness and mineral density (MD). The scanned specimens were 3D reconstructed to qualitatively determine the surface topography. The dentin thickness was two-fold greater than enamel thickness for both natal and neonatal teeth (p < 0.05). The cervical third enamel MD remained undetermined in natal and neonatal teeth. The dentin MD at the cervical third for neonatal teeth was significantly lower than the incisal and middle third dentin (p < 0.05). Similarly, the dentin MD at the cervical third of neonatal teeth was significantly lower than the cervical third dentin MD of natal teeth (p < 0.05). Our qualitative analysis suggests that the cervical thirds of both natal and neonatal teeth are peculiar of an anomalous structure, with neonatal teeth showing an irregular outline. Under the conditions of the present study, it can be concluded that the neonatal teeth studied exhibited a distinguishable aberrant structure compared to the natal teeth. Therefore, the natal teeth unfold as a more organized, three-dimensional structure compared to the neonatal teeth.
PubMed: 35455604
DOI: 10.3390/children9040560 -
BMC Oral Health Oct 2022This non-inferiority randomised clinical trial aimed to evaluate the survival of direct bulk fill composite resin restorations in primary molars using different methods... (Randomized Controlled Trial)
Randomized Controlled Trial
BACKGROUND
This non-inferiority randomised clinical trial aimed to evaluate the survival of direct bulk fill composite resin restorations in primary molars using different methods of moisture control: rubber dam isolation (RDI-local anaesthesia and rubber dam) and cotton roll isolation (CRI-cotton roll and saliva ejector). Secondary outcomes included baseline and 2-year incremental cost, self-reported child's pain scores and patient behaviour during the restorative procedure.
METHODS
A total of 174 molars (93 children) with dentine caries lesions were randomly allocated to study groups (RDI or CRI) and restored with bulk fill composite resin by trained operators. Two blinded examiners assessed the restorations for up to 24 months. Wong-baker faces and Frankl's behaviour rating scales were used for accessing the child's pain and behaviour, respectively. The primary outcome (restoration survival) was analysed using the two-sample non-inferiority test for survival data using Cox Regression (non-inferiority/alternative hypothesis HR > 0.85; CI = 90%). Bootstrap Linear regression was used for cost analysis and logistic regression for pain and behaviour analysis (α = 5%).
RESULTS
After 2-years, 157 restorations were evaluated (drop-out = 9.7%). The survival rate was RDI = 60.4% and CRI = 54.3%. The non-inferiority hypothesis was accepted by the Cox Regression analysis (HR = 1.33; 90% CI 0.88-1.99; p = 0.036). RDI was 53% more expensive when compared to the CRI group. No differences were found between the groups regarding pain (p = 0.073) and behaviour (p = 0.788).
CONCLUSION
Cotton roll isolation proved to be non-inferior when compared to rubber dam for composite restorations longevity in primary molars. Furthermore, the latest presented the disadvantage of higher cost and longer procedure time. Clinical Significance The moisture control method does not influence the longevity of composite restorations in primary molars. Cotton roll isolation proved to be non-inferior to rubber dam isolation and is a viable option for restoring primary molars. Clinical trial registration registered NCT03733522 on 07/11/2018. The present trial was nested within another clinical trial, the CARies DEtection in Children (CARDEC-03-NCT03520309).
Topics: Child; Composite Resins; Dental Caries; Dental Restoration, Permanent; Humans; Molar; Pain; Rubber Dams
PubMed: 36217147
DOI: 10.1186/s12903-022-02449-y -
ISRN Pediatrics Aug 2013The occurrence of natal and neonatal teeth is an uncommon anomaly, which for centuries has been associated with diverse superstitions among different ethnic groups.... (Review)
Review
The occurrence of natal and neonatal teeth is an uncommon anomaly, which for centuries has been associated with diverse superstitions among different ethnic groups. Natal teeth are more frequent than neonatal teeth, with the ratio being approximately 3 : 1. It must be considered that natal and neonatal teeth are conditions of fundamental importance not only for a dental surgeon but also for a paediatrician since their presence may lead to numerous complications. Early detection and treatment of these teeth are recommended because they may induce deformity or mutilation of tongue, dehydration, inadequate nutrients intake by the infant, and growth retardation, the pattern and time of eruption of teeth and its morphology. This paper presents a concise review of the literature about neonatal teeth.
PubMed: 24024038
DOI: 10.1155/2013/956269 -
Journal of International Society of... 2018Forensic odontology is the subdiscipline of dentistry which analyses dental evidence in the interest of justice. Oral pathology is the subdiscipline of dentistry that... (Review)
Review
Forensic odontology is the subdiscipline of dentistry which analyses dental evidence in the interest of justice. Oral pathology is the subdiscipline of dentistry that deals with the pathology affecting the oral and maxillofacial regions. This subdiscipline is utilized for identification through oral and maxillofacial pathologies with associated syndromes, enamel rod patterns, sex determination using exfoliative cytology, identification from occlusal morphology of teeth, and deoxyribonucleic acid profiling from teeth. This subdiscipline is also utilized for age estimation studies which include Gustafson's method, incremental lines of Retzius, perikymata, natal line formation in teeth, neonatal line, racemization of collagen in dentin, cemental incremental lines, thickness of the cementum, and translucency of dentin. Even though the expertise of an oral pathologist is not taken in forensic investigations, this paper aims to discuss the role of oral pathology in forensic investigation.
PubMed: 29629322
DOI: 10.4103/jispcd.JISPCD_435_17 -
Medical Journal, Armed Forces India Apr 2021Teeth present at the time of birth are called natal teeth while the teeth which erupt within 30 days of birth are neonatal teeth. The natal and neonatal teeth are an...
BACKGROUND
Teeth present at the time of birth are called natal teeth while the teeth which erupt within 30 days of birth are neonatal teeth. The natal and neonatal teeth are an uncommon occurrence causing extreme anxiousness among the parents because of various myths related to their occurrence in our society.
METHODS
A retrospective analysis of 12 patients who reported to the dental center between 2012 and 2015 with natal or neonatal teeth was carried out.
RESULTS
Our study sample comprised of 12 patients. The age group ranged from 4 to 27 days in which there were eight male and four female infants. Out of 12 cases, eight cases had history of a physiologic delivery, while four were delivered by C-section. All the teeth were white to yellowish white in color, grade III mobile, and were devoid of roots. Except difficulty in feeding, only one case had a complication because of the tooth which was the development of a small lingual ulcer. Eleven cases were managed by extraction of the natal or neonatal teeth, and in one case, the parents did not consent for extraction. Six infants below 10 days of age were administered inj Vit K prior to the extraction. On follow-up of all the patients families reported that the child was feeding much better after the treatment and there were no complications.
CONCLUSION
Natal and neonatal teeth have been causing dilemmas in the minds of pediatricians and dentists world over. Thus, it is important to know the basics about such teeth so that proper guidance can be given to parents and a suitable case specific treatment plan can be formulated.
PubMed: 33867630
DOI: 10.1016/j.mjafi.2018.07.001 -
Contemporary Clinical Dentistry 2018Presence of teeth in a neonate is a rare occurrence due to the disturbance in the biological chronology of teeth. Although uncommon, these teeth if present are found to...
BACKGROUND
Presence of teeth in a neonate is a rare occurrence due to the disturbance in the biological chronology of teeth. Although uncommon, these teeth if present are found to have several clinical implications.
AIMS
This study aimed to describe the clinical characteristics and the treatment outcome of natal and neonatal teeth from a hospital setting.
MATERIALS AND METHODS
This retrospective study was carried out by reviewing the hospital records of babies with natal or neonatal teeth in a tertiary hospital in Tamil Nadu between January 1, 2012, and December 31, 2014. Babies with complete clinical data along with their follow-up records were selected and results were analyzed.
RESULTS
Complete clinical data of 33 babies with a total of 52 teeth were included, of which 28 teeth were natal and 24 teeth were neonatal. All the teeth were located in the mandibular primary incisor region and majority were in pairs. A positive family history was present in eight cases. Extractions were carried out only in cases where the teeth were found to be extremely loose or interfering with feeding. The only local complication noted in this study was Riga-Fede disease.
CONCLUSIONS
The findings of this study suggest that natal and neonatal teeth may have a possible hereditary basis. All the teeth were noted to be prematurely erupted primary teeth rather than supernumerary teeth. Both dentists and pediatricians need to be aware of the clinical implications of these teeth and that they should be retained unless they are symptomatic.
PubMed: 29875564
DOI: 10.4103/ccd.ccd_814_17 -
Journal of the Formosan Medical... Mar 2017Since there is no comprehensive research of natal and neonatal teeth in Taiwan, careful investigation of natal or neonatal teeth is worthy of being studied. This...
BACKGROUND/PURPOSE
Since there is no comprehensive research of natal and neonatal teeth in Taiwan, careful investigation of natal or neonatal teeth is worthy of being studied. This retrospective study investigated the prevalence and clinical characteristics of natal or neonatal teeth in a hospital setting, and analyzed the possible relationships between investigated variables of the natal or neonatal teeth.
METHODS
All of the 12,019 infants born at an assigned hospital between January 1, 2008 and December 31, 2014 were investigated for natal or neonatal teeth. The identified individuals were reviewed for systemic diseases. Dental examinations included the location, clinical appearance, and degree of mobility. A positive family history of natal or neonatal teeth and mother's physical condition before delivery were also investigated. The collected data were analyzed using Fisher's exact test.
RESULTS
Thirty infants were identified with a total of 43 natal or neonatal teeth (females, 19; males, 11). Most of the teeth were in the mandibular primary incisor position (97.6%). A radiographic examination confirmed that not all of the natal or neonatal teeth were supernumerary. No significant differences were observed between males and females in tooth morphology, positive family history, and treatment methods (p > 0.05) or between normal and conical shapes in positive family history, premature infant, mother's physical condition before delivery, and treatment methods (p > 0.05).
CONCLUSION
Most of the natal or neonatal teeth were in the mandibular primary incisor position and not all of them were supernumerary. No gender differences were found in tooth morphology, positive family history, and treatment methods. The tooth morphology was not significantly related to a positive family history, premature delivery, or the mother's physical condition before delivery.
Topics: Female; Humans; Incisor; Infant; Infant, Newborn; Male; Mandible; Natal Teeth; Prevalence; Radiography, Dental; Retrospective Studies; Taiwan; Tooth Eruption; Tooth Extraction; Tooth Mobility; Tooth, Supernumerary
PubMed: 27133183
DOI: 10.1016/j.jfma.2016.03.009 -
Case Reports in Dentistry 2015The presence of teeth at birth (natal teeth) or within a month after delivery (neonatal teeth) is a rare condition. Natal and neonatal teeth are conditions of...
The presence of teeth at birth (natal teeth) or within a month after delivery (neonatal teeth) is a rare condition. Natal and neonatal teeth are conditions of significant importance to pediatric dentists and pediatricians. This report discusses a case in which a five-day-old infant required extraction of a mobile mandibular natal tooth to avoid the risk of aspiration and interference with feeding. Also, a review of the literature was conducted to discuss the etiology, clinical features, complications, and management of natal and neonatal teeth.
PubMed: 25722895
DOI: 10.1155/2015/147580