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BMC Oral Health Oct 2023The aim of this study was to determine whether there is any association between molar incisor hypomineralization and developmental dental anomalies.
BACKGROUND
The aim of this study was to determine whether there is any association between molar incisor hypomineralization and developmental dental anomalies.
METHODS
Two pediatric dentists evaluated panoramic radiographs of 429 children aged 8-14 years with molar incisor hypomineralization (study group) and 437 children without molar incisor hypomineralization (control group) in terms of developmental dental anomalies. Twelve different developmental dental anomalies were categorized into four types: size (microdontia, macrodontia); position (ectopic eruption of maxillary permanent first molars, infraocclusion of primary molars); shape (fusion, gemination, dilaceration, taurodontism, peg-shaped maxillary lateral incisors); and number (hypodontia, oligodontia, hyperdontia) anomalies.
RESULTS
No significant difference was observed in the frequencies of developmental dental anomalies between the study and control groups in total, females, and males (p > 0.05). A statistically significant difference was found between the distribution of developmental size, position, shape, and number anomalies between the study and control groups (p = 0.024). The most common anomaly in both groups was hypodontia (6.3% and 5.9%, respectively). There was a significant difference between the study and control groups in terms of subtypes of shape anomaly in all children and females (p = 0.045 and p = 0.05, respectively).
CONCLUSIONS
While a significant difference was observed between the distributions of types of developmental dental anomalies between individuals with and without molar incisor hypomineralization, there was no difference in terms of the frequency of developmental dental anomalies.
Topics: Male; Child; Female; Humans; Anodontia; Case-Control Studies; Molar Hypomineralization; Tooth Abnormalities; Tooth, Supernumerary; Molar; Prevalence; Dental Enamel Hypoplasia
PubMed: 37865729
DOI: 10.1186/s12903-023-03540-8 -
The Journal of Contemporary Dental... Apr 2022The aim of this study was to evaluate clinical features that might be related to success rates of autotransplantation of molars with complete root formation.
AIM
The aim of this study was to evaluate clinical features that might be related to success rates of autotransplantation of molars with complete root formation.
MATERIALS AND METHODS
A group of 60 patients with completely formed third molars autotransplanted to a different molar socket was followed for a medium period of 5 years and 5 months. Extreme care was used in order to preserve the vitality of the periodontal ligament cells. The same technique was applied for all teeth despite different anatomies. Descriptive statistics was performed. The association of the various factors with failures was assessed by using the Fisher's exact test and a -value of 0.05 was considered as significance threshold.
RESULTS
Autotransplantation was found to be a reliable method to replace extracted molar teeth with closed apices. The two major factors that positively influenced the outcomes were fixation with splint and a periodontal probing pocket depth less than 4 mm after the initial healing period. The technique resulted in a suitable well-conserved socket and donor tooth, after the extraction.
CONCLUSION
An accurate case evaluation was critically important in order to identify the risks prior to surgery and to select the right patients for this procedure. Autotransplantation of third molar teeth is a feasible approach to replace compromised mature molars. Proper stabilization of the transplanted tooth is strategical for the success of this procedure. A conservative approach to unerupted wisdom teeth is also recommended.
CLINICAL SIGNIFICANCE
Dental implants and fixed prostheses have been utilized to replace missing teeth, and orthodontic space closure can be sometimes an effective treatment option. Tooth autotransplantation can be a reliable and less invasive clinical alternative when an appropriate donor site is available.
Topics: Humans; Molar; Molar, Third; Periodontal Pocket; Tooth Extraction; Tooth Socket; Transplantation, Autologous
PubMed: 35945841
DOI: No ID Found -
PloS One 2022Dental prostheses, which aim to replace missing teeth and to restore patients' appearance and oral functions, should be biomimetic and thus adopt the occlusal morphology...
BACKGROUND
Dental prostheses, which aim to replace missing teeth and to restore patients' appearance and oral functions, should be biomimetic and thus adopt the occlusal morphology and three-dimensional (3D) position of healthy natural teeth. Since the teeth of an individual subject are controlled by the same set of genes (genotype) and are exposed to mostly identical oral environment (phenotype), the occlusal morphology and 3D position of teeth of an individual patient are inter-related. It is hypothesized that artificial intelligence (AI) can automate the design of single-tooth dental prostheses after learning the features of the remaining dentition.
MATERIALS AND METHODS
This article describes the protocol of a prospective experimental study, which aims to train and to validate the AI system for design of single molar dental prostheses. Maxillary and mandibular dentate teeth models will be collected and digitized from at least 250 volunteers. The (original) digitized maxillary teeth models will be duplicated and processed by removal of right maxillary first molars (FDI tooth 16). Teeth models will be randomly divided into training and validation sets. At least 200 training sets of the original and the processed digitalized teeth models will be input into 3D Generative Adversarial Network (GAN) for training. Among the validation sets, tooth 16 will be generated by AI on 50 processed models and the morphology and 3D position of AI-generated tooth will be compared to that of the natural tooth in the original maxillary teeth model. The use of different GAN algorithms and the need of antagonist mandibular teeth model will be investigated. Results will be reported following the CONSORT-AI.
Topics: Artificial Intelligence; Dental Prosthesis; Humans; Molar; Molar, Third; Prospective Studies; Randomized Controlled Trials as Topic
PubMed: 35653388
DOI: 10.1371/journal.pone.0268535 -
Pediatric Dentistry May 2023The purpose of this randomized clinical trial was to evaluate the clinical and radiographic success of the premixed bioceramic (NeoPUTTY®) as pulpotomy medicament in... (Randomized Controlled Trial)
Randomized Controlled Trial
PURPOSE
The purpose of this randomized clinical trial was to evaluate the clinical and radiographic success of the premixed bioceramic (NeoPUTTY®) as pulpotomy medicament in primary molars in comparison to NeoMTA® 2.
METHODS
Seventy primary molars indicated for pulpotomy in 42 children were randomly allocated into two groups: (1) a mineral trioxide aggregate (MTA) group (NeoMTA® 2); and (2) a premixed bioceramic group (NeoPUTTY®). Clinical and radiographic examinations of the molars following pulpotomy were conducted by two independent evaluators at six and 12 months. The data were analyzed using Fishe`s exact tests.
RESULTS
At 12 months, the clinical and radiographic success for the MTA group were 100 percent (34 out of 34) and 94.1 percent (32 out of 34), respectively. For the NeoPUTTY® group, the clinical and radiographic success were 97.1 percent (34 out of 35) and 92.8 percent (32 out of 35), respectively. No significant differences were found between the two materials.
CONCLUSIONS
NeoPUTTY® showed a comparable success to mineral trioxide aggregate in primary molar pulpotomies over 12 months. Further clinical trials with larger sample sizes and longer follow-up periods are recommended.
Topics: Child; Humans; Pulpotomy; Molar
PubMed: 37381123
DOI: No ID Found -
American Journal of Orthodontics and... Jun 2021Rarely is the extraction of the four first molars the ideal choice in the course of orthodontic treatment, particularly in older patients. Although this approach can...
Rarely is the extraction of the four first molars the ideal choice in the course of orthodontic treatment, particularly in older patients. Although this approach can offer distinct advantages in carefully selected patients, it is also associated with a number of well-recognized problems, including the extension of treatment times, anchorage management, and control of second molars during space closure. However, by careful use of contemporary materials and techniques, a high standard of treatment can be achieved, even in patients with complex malocclusions. This is illustrated in a report of a case that highlights both the challenges and some of the solutions this treatment modality can offer.
Topics: Aged; Humans; Malocclusion; Molar; Orthodontic Anchorage Procedures; Orthodontic Space Closure; Tooth Movement Techniques
PubMed: 33771431
DOI: 10.1016/j.ajodo.2020.11.035 -
Clinical and Experimental Dental... Dec 2021The shapes of gubernaculum tracts (GTs) in molars as accessional teeth remain unidentified. To elucidate imaging peculiarities of GTs in molars with aging on...
OBJECTIVES
The shapes of gubernaculum tracts (GTs) in molars as accessional teeth remain unidentified. To elucidate imaging peculiarities of GTs in molars with aging on multidetector-row computed tomography (MDCT).
MATERIAL AND METHODS
This retrospective study was conducted using CT images, including maxillary and mandibular molars, with no abnormal findings from 239 patients. Shapes of alveolar bone, GTs, and dental sacs of the maxillary and mandibular molars were analyzed multi-sectionally. Correlations between 2- and 3-dimensional imaging figures of GTs in molars and chronological age or stage of molar formation were analyzed.
RESULTS
Some forms of GTs in maxillary and mandibular third molars were observed. In the early stage, GTs were visualized as bone defect lines on the dentition and grooves on the mesial alveolar crest continuous with the dental sac to mesial tooth bud. GTs of the third molar formed a J-shape in maxillary teeth and Y-shape in mandibular teeth in the middle stage, as alveolar bone around the GT developed. In the mature stage, the course of the GT changed to straight and perpendicular. Some GT forms were also identified in first and second molars. Significant correlations were found between GT alterations and chronological age or stage of molar formation. Moreover, tracts continuing from the distal side of mandibular third molars were detected.
CONCLUSIONS
This paper describes the peculiarities and process of progression for GTs in molars, and the existence of tracts continuing from the distal side of mandibular third molars, unlikely dentition with deciduous predecessors. These preliminary data should prove beneficial for studies focusing on GTs in molars.
Topics: Gubernaculum; Humans; Molar; Molar, Third; Retrospective Studies; Tomography, X-Ray Computed
PubMed: 34137209
DOI: 10.1002/cre2.452 -
Dental Press Journal of Orthodontics 2023To explore the association between chronological, dental and skeletal ages and early diagnosis of third molars agenesis.
OBJECTIVE
To explore the association between chronological, dental and skeletal ages and early diagnosis of third molars agenesis.
MATERIAL AND METHODS
This retrospective radiographic study comprised a sample of 282 Portuguese patients (122 males and 160 females) who sought orthodontic treatment between 2007 and 2018. Each participant had panoramic and lateral cephalometric radiographs performed before and after the age of 14 years. The chronological age was categorized into three intervals between 11.0 and 13.11 years of age. The full eruption of the four-second molars was used as a criterion in determining dental age. Skeletal age was verified by the vertebral maturation method. The diagnosis of agenesis of third molars was initially performed by observation of the initial panoramic radiography undertaken before the age of 14 years. Subsequently, the diagnosis of agenesis of third molars was confirmed by visualizing the second panoramic radiography, obtained after the age of 14 years. The association between the accuracy of the diagnosis and the chronological, dental and skeletal ages was evaluated using the chi-square test, at a 5% significance level.
RESULTS
No significant association between chronological age and alterations in the diagnosis of third molar agenesis was identified. However, there was a significant association between third molar agenesis and both dental age (p<0.001) and skeletal age (p=0.006).
CONCLUSION
The eruption of the four-second molars and the peak of growth could be considered as criteria for early diagnosis of third molar agenesis, whereas chronological age is not a reliable diagnostic indicator.
Topics: Male; Female; Humans; Adolescent; Child, Preschool; Molar, Third; Retrospective Studies; Molar; Anodontia; Radiography, Panoramic; Early Diagnosis
PubMed: 37466505
DOI: 10.1590/2177-6709.28.3.e2321322.oar -
Journal of Oral and Maxillofacial... Aug 2020The aim of the present study was to evaluate the genetic and environmental factors influencing the localization of mandibular third molars by analyzing the panoramic...
PURPOSE
The aim of the present study was to evaluate the genetic and environmental factors influencing the localization of mandibular third molars by analyzing the panoramic radiographs of twins. We examined the mandibular third molars of Japanese monozygotic (MZ) and dizygotic (DZ) twins recruited by the Osaka University Center for Twin Research.
MATERIALS AND METHODS
The present study included 49 pairs (98 participants) of MZ twins and 11 pairs (22 participants) of DZ twins. Using panoramic radiography, we evaluated the degree of eruption of mandibular third molars according to the height of the alveolus bone and the third molar space/crown width ratio. Using co-twin control analysis and a generalized linear mixed model, we evaluated the effects of various factors, including gender, age, body height, number of teeth, length of the lower dental arch, existence of a second molar, bruxism, and previous orthodontic therapy.
RESULTS
Body height, third molar space/crown width ratio, and length of the mandibular dental arch were related to the degree of mandibular third molar eruption and were strongly influenced by genetic factors rather than common or unique environmental factors.
CONCLUSIONS
The degree of third molar eruption was more similar among MZ twins than among DZ twins; therefore, genetic factors can be expected to have more significant influence than will environmental factors. These results can help identify the trend of third molar eruption from a young age, allowing us to advise the early extraction of mandibular third molars for patients with a short stature, narrow retromolar space, or short mandibular dental arch. In addition, if the genes that influence the degree of eruption were identified, we would be better equipped to predict an individual's risk of impaction, and indications for extraction might change.
Topics: Humans; Mandible; Molar; Molar, Third; Radiography, Panoramic; Tooth Eruption; Tooth, Impacted
PubMed: 32315639
DOI: 10.1016/j.joms.2020.03.021 -
Journal of Endodontics Dec 2023This study aimed to assess the fracture resistance of mandibular first molars after preparation with 3 different access cavity designs and 2 rotary systems using finite...
INTRODUCTION
This study aimed to assess the fracture resistance of mandibular first molars after preparation with 3 different access cavity designs and 2 rotary systems using finite element analysis.
METHODS
Six 3-dimensionally printed mandibular first molars simulating natural teeth received traditional, conservative, and ultraconservative (truss) access cavity preparations. The root canals in each group were instrumented with either XP-Endo Shaper (FKG Dentaire, La Chaux-de-Fonds, Switzerland) or TruNatomy (Dentsply Sirona, Ballaigues, Switzerland) rotary files. The models were individually digitized, and micro-computed tomographic scans were transferred to Mimics software (Materialise NV, Leuven, Belgium) to create a geometric model of the tooth. The designed model was exported to 3-matic software (Materialise NV), and STL files were transferred to Geomagic Design X (3D Systems, Rock Hill, SC). Point cloud data were used for surfacing and transferred to ANSYS software (Ansys, Canonsburg, PA). A 200-N superficial force was applied vertically to the buccal cusps and central fossa, and the maximum and minimum equivalent von Mises stress values were calculated and reported.
RESULTS
The traditional and ultraconservative access cavity designs yielded the highest and the lowest von Mises stress values, respectively. In the ultraconservative cavity design, the stress values in pericervical dentin were lower in canal preparation with TruNatomy compared with XP-Endo Shaper. In the traditional and conservative cavity designs, stress was lower in the first 2 mm from the cementoenamel junction in the XP-Endo Shaper group and in the next 3 mm in the TruNatomy group.
CONCLUSIONS
Stress was lower in the ultraconservative and conservative cavity designs compared with the traditional design. Also, root canal preparation with TruNatomy yielded lower stress values in general compared with XP-Endo Shaper.
Topics: Dental Pulp Cavity; Finite Element Analysis; X-Ray Microtomography; Molar; Root Canal Preparation
PubMed: 37804945
DOI: 10.1016/j.joen.2023.09.014 -
BMC Oral Health Sep 2023This study aimed to assess the root canal morphology of primary molars using cone-beam computed tomography (CBCT).
BACKGROUND
This study aimed to assess the root canal morphology of primary molars using cone-beam computed tomography (CBCT).
METHODS
This cross-sectional study evaluated 60 maxillary and mandibular primary first and second molars on CBCT scans of patients retrieved from the archives of Hamadan School of Dentistry between 2018-2020. The teeth were evaluated regarding the number of roots and canals, canal type according to the Vertucci's classification, and root surface concavities. Data were analyzed descriptively and by independent t-test.
RESULTS
The most frequent number of canals and roots in the maxillary right and left first molars was 3 canals (60%) and 3 roots (80%). These values were 4 canals (80%) and 5 canals (50%) with 3 roots in the maxillary right and left second molars, respectively, 4 canals (100%) and 2 roots (50%), and 3 canals (60%) and 2 roots (50%) in mandibular right and left first molars, respectively, and 4 canals (92.3%) and 3 roots (61.5%) in mandibular right and left second molars. Vertucci's type IV was the most common canal type in mesial and distal canals, type I was the most common in mesiobuccal, mesiolingual, distobuccal, and distolingual, and types I and II were the most common in the palatal canal. The maximum and minimum concavities were noted in the buccal (26.7%) and mesial (8.3%) surfaces, respectively.
CONCLUSIONS
A wide variation exists in the number of roots and canals of maxillary and mandibular primary molars, which calls for further attention in treatment of such teeth.
Topics: Humans; Dental Pulp Cavity; Cross-Sectional Studies; Root Canal Therapy; Molar; Cone-Beam Computed Tomography
PubMed: 37749546
DOI: 10.1186/s12903-023-03414-z