Computed tomography assessment of hypodontia and crown size in hemifacial microsomia.

OBJECTIVE: Our aims were to assess the prevalence of hypodontia in unilateral hemifacial microsomia (HFM), and to compare tooth (crown) size between affected and unaffected sides. DESIGN: In a retrospective cross-sectional study of South Australians, computed tomography (CT) scans were used to assess hypodontia and crown size (mesiodistal length, buccolingual width and crown height). The inclusion criteria were the absence of other congenital anomalies and the availability of CT scans. The exclusion criteria were the lack of extraction history or reproducible landmarks for morphometric assessment. The final sample comprised 41 participants in both dentitions, including 32 children and 9 adults (median age 13.9 years, range 0.4 - 47.6 years; 19 males and 22 females). Hypodontia was assessed in all participants, and the permanent crown size in 30 (73.2%) participants. Linear mixed-effects models were performed to determine if crown size was significantly different between the two sides, controlling for sex, HFM severity, and tooth and jaw type. RESULTS: Hypodontia occurred in none of the participants in the primary dentition, but in 6/30 (20%) participants in the permanent dentition (3/30 each on the affected and unaffected sides). There was no significant difference in the mean crown dimensions between the two sides, but the crown size was larger in males (p < 0.05), except for mesiodistal length, and became progressively smaller with increased HFM severity (p < 0.05). CONCLUSIONS: Hypodontia spared the primary dentition but featured prominently in the permanent dentition. The permanent crown dimensions were unaltered between the two sides.

Prevalence and management of patients with hypodontia: A cross-sectional study.

BACKGROUND: Hypodontia is one of the most common anomalies in dentistry. Hypodontia has a negative impact on oral health-related quality of life with patients best seen in a multidisciplinary clinic to improve treatment outcomes. AIM: To investigate the prevalence of hypodontia and its association with other dental anomalies, as well as malocclusion, and to investigate the treatment planned for patients attending the clinic and whether the type of missing teeth affected the proposed treatment. MATERIALS AND METHODS: Analysis of consecutive patients attending the hypodontia clinic at a dental hospital between February and November 2020. A total of 100 patients who met the inclusion criteria were identified. Data collected included the following: age/sex; number and type of missing teeth; pre-treatment occlusion; presence of other dental anomalies; and planned treatment. RESULTS: A total of 100 patients (55% female; age range = 7-41 years; mean age = 18 years) were included. Of the cohort, 47% had a class I skeletal relationship and participants were significantly less likely to have a class III skeletal or incisor relationship; 45% had another dental anomaly with the most common being microdontia. Space opening was the preferred treatment option for those managed by orthodontic treatment with resin-bonded bridges most likely to be used for restoration of spaces, 86%. CONCLUSION: Lower second premolars were the most commonly missing teeth. Participants were significantly less likely to have a class III incisor or skeletal relationship than class I or II. Space opening was the favoured approach for orthodontic treatment, particularly for maxillary lateral incisors.

Prevalence of malocclusions and orthodontic treatment need in 8- to 12-year-old schoolchildren in Casablanca, Morocco.

OBJECTIVES: The purpose of this work was to evaluate the prevalence of malocclusions and orthodontic treatment need among schoolchildren in Casablanca, Morocco. MATERIALS AND METHODS: A sample of 1000 children aged between 8 and 12 years, with no history of orthodontic treatment, was chosen at random in state schools in different administrative areas of the city of Casablanca. Data was registered using the method of Bjork et al. (1964). Orthodontic treatment need was assessed with the index used by the Swedish National Board of Health (SweNBH). RESULTS: We found Angle Class I malocclusions in 61.4%, Class II in 24%, Class III in 10% and an indeterminate molar class with one or more missing molars in 4.6% of the children. Overjet was 1-4mm in 63.8%, 4-6 mm in 17.2% and >6 mm in 10%. Bite was normal in 65.4%, 23.6% presented an overbite greater than 4 mm, 1.7% an anterior open bite ≤3 mm, 1.2% an anterior open bite >3 mm and 0.2% a bilateral open bite. Half of the sample presented anterior crowding, while only 2.5% presented posterior crowding. In all, 84.2% of the subjects needed some orthodontic treatment, and 15.8% needed no treatment. No statistically significant difference was found between sex or age and orthodontic treatment need (P>0.05). CONCLUSIONS: This study found a strong need for orthodontic treatment, confirming the utility of implementing a programme of bucco-dental prevention and screening for malocclusion.

Radiographic assessment of agenesis of third molars andpara-radicular third molar radiolucencies in populationof age group 18-25 years old: a radiographic survey / Avaliação radiográfica da gênese e radiolucidezperirradicular de terceiros molares em população de faixaetária de 18-25 anos: um levantamento radiográfico

Introduction: Due to biological, cultural and evolutionary changes with time, humans have experienced adecreased dependency on all tooth types. Because of this, the number of certain teeth which are no longernecessary for function are either getting increasingly impacted or are not developing at all. This is especiallythe case where third molars are concerned. Objective: To assess the prevalence of agenesis of third molarsand para-radicular third molar radiolucencies in population of age group 18-25 years. Materials and methods:Five hundred patients of age ranging from 18 to 25 years old were selected randomly and subjectedto undergo conventional panoramic radiographic procedure. Results: 35.4% patients of our study populationrevealed agenesis of one of the third molars among the four third molars. Agenesis of right maxillarythird molar is quite significant as p = 0.030; and only 3.4% revealed the prevalence of para-radicular thirdmolar radiolucencies. Conclusion: As time goes by, agenesis of the third molars is increasing, so they canbe considered as vestigial. However, etiology of the para-radicular third molar radiolucencies is unknown.Hence, further research is needed to describe the nature as well as outcome of mandibular para-radicularthird molar radiolucencies.

Introdução: Em virtude de alterações biológicas, culturais e evolutivas com o tempo, os seres humanos têmexperimentado uma diminuição da dependência em todos os tipos de dentes. Por isso, os dentes que já nãosão necessários para a função estão ficando cada vez mais impactados ou não estão sequer se desenvolvendo.Este é especialmente o caso dos terceiros molares. Objetivo: Avaliar a prevalência de agenesia dos terceirosmolares e radiolucidez perirradicular em terceiros molares em uma população com faixa etária de 18-25 anos.Materiais e métodos: Quinhentos pacientes entre 18-25 anos foram selecionados aleatoriamente e submetidosa um exame radiográfico panorâmico convencional. Resultados: 35,4% dos pacientes da população deestudo revelaram agenesia de um dos terceiros molares entre os quatro terceiros molares. Agenesia do terceiromolar superior direito foi bastante significativa com valor p = 0,030 e apenas 3,4% revelaram a prevalência deradiolucidez perirradicular nos terceiros molares. Conclusão: Com o tempo, a agenesia dos terceiros molaresestá aumentando, de modo que podem ser considerados vestigiais. Porém, a etiologia da radiolucidez perirradicularnos terceiros molares é desconhecida. Portanto, mais pesquisas são necessárias para descrever a natureza,bem como as consequências de radiolucidez perirradicular em terceiros molares inferiores.

Referral mode and pattern of malocclusion among patients attending the Lagos University Teaching Hospital, Lagos, Nigeria.

BACKGROUND: In Nigeria, the awareness of the dentition and its role in the overall facial beauty is increasing, especially in the urban areas. The purpose of this study was to assess the demand for orthodontic treatment and the pattern of malocclusion in patients attending the Lagos University Teaching Hospital, Lagos, Nigeria. METHOD: A 5-year retrospective study of 633 patients, 288 males (45.5%) and 345 females (54.5%) attending the orthodontic unit of the hospital. RESULTS: The patients seen ranged from 1 to 50 years with the most frequent age group being that of 12-17 years constituting 37.5% of the total patients seen. Adult patients made up 30.7% of attending patients. Self-referred patients constituted 64.1% of this population. Class I molar relationship was predominantly occurring seen in 76.7% of patients. Anterior segment crowding was recorded in 38.7% and 43.2% of the patients for the upper and lower arch respectively. Marked increase in overjet was observed in 32.2%. Overbite discrepancies were recorded with 26.2% of patients with deep bite and 11.2% of patients with anterior open bite. A history or ongoing oral habit was recorded in 61.8% of patients.

Oligodontia and associated characteristics: assessment in view of prosthodontic rehabilitation.

Bibliographic evidence regarding oligodontia was reviewed to extract information necessary for a systematic review for a prosthodontic approach to management. Syndromic oligodontia, appearing as a symptom of many syndromes, was distinguished from isolated, or non-syndromic, which is an independent trait. Although a rare disorder, oligodontia has always been considerably researched, especially concerning its prevalence and genetic background. Non-syndromic oligodontia has been associated with the presence of small and misshapen natural teeth, orofacial clefting and reduced saliva secretion. A typical maxillofacial morphology has also been reported, which seems to result from the lack of dental and functional compensation and not from an altered growth pattern. Syndromic oligodontias also exhibit the above basic features but are complicated by each syndrome's specific characteristics. Prosthodontic treatment of individuals with oligodontia must anticipate the dental and oral clinical characteristics and provide with continuing support and preservation of proper maxillofacial relationships.

Modern restorative management of patients with congenitally missing teeth: 1. Introduction, terminology and epidemiology.

The management of patients with congenitally missing teeth can be a challenge and, in many cases, requires multidisciplinary care. In this four-part series, a contemporary approach to managing this group of patients is discussed. This first paper examines the terminology, epidemiology and restorative challenges that such patients can exhibit.

Orthodontic treatment need and demand in 12-14-year-old north Jordanian school children.

This study was undertaken to assess the need and demand for orthodontic treatment among 12-14-year-old north Jordanian school children. In total, 1002 students randomly selected to represent five geographical areas of Irbid were examined. The examinations were carried out twice, first on the pupils in the school premises and then using study models taken from each student. The dental health (DHC) and aesthetic (AC) components of the Index of Orthodontic Treatment Need (IOTN) were used as an assessment measure of the need for orthodontic treatment. The demand for orthodontic treatment was measured by asking the students 'if it was necessary, would they like to have their teeth straightened by an orthodontist'. The results showed that approximately one-third (34 per cent) of the children examined had a definite need for orthodontic treatment. Within this group, 73.5 per cent were in need of orthodontic treatment according to the DHC, 23.5 per cent had both DHC and AC great need scores, and 3 per cent were in need according to the AC only. Severe contact point displacement of more than 4 mm was the most common occlusal feature in the definite treatment need group, followed by impeded eruption of teeth, hypoplasia of a single tooth and increased overjet of more than 6 mm but less than or equal to 9 mm. The demand for orthodontic treatment among the students was 49 per cent. Approximately half of them (54 per cent) had a definite need for orthodontic treatment. This study provides baseline data on the need and demand for orthodontic treatment among a Jordanian population, which is important for planning public orthodontic and dental services.

Radiographic assessment of congenitally missing teeth in orthodontic patients.

OBJECTIVE: To estimate the prevalence of congenitally missing teeth (CMT) in patients evaluated for orthodontic care. A sample of 668 panoramic radiographs from Mexican population was reviewed from orthodontic healthy patients, 9-20 years old. METHOD: Statistical tests were used to compare maxillary and mandibular hypodontia in right and left quadrants between males and females. RESULTS: Prevalence was 27% when all teeth were included, and was 2.7% when third molars were excluded. A significant difference was found between maxillary and mandibular symmetrical CMT in third maxillary molars, lateral incisors and second premolars (P < 0.001), and in mandibular third molars and central incisors (P < 0.001). CONCLUSIONS: We confirmed that occurrence of CMT in the permanent dentition of a Mexican population most often affects third molars, followed by maxillary lateral incisors and then mandibular second premolars.

Hypodontia in 9-year-old Norwegians related to need of orthodontic treatment.

The present study reports on the prevalence of hypodontia in a Norwegian population and classifies children with hypodontia according to need of orthodontic treatment. Orthopantomograms of 1953 children (960 girls and 993 boys) at the age of 9 were available for examination. Of the boys registered with hypodontia of second premolars at the age of 9, 11.3% showed late mineralization between the ages of 9 and 12. Only 2.9% of the girls showed late mineralization. The corrected prevalence of hypodontia, excluding third molars, in the girls was 7.2%, in the boys 5.8%, and in both sexes combined 6.5%, the difference between sexes not being statistically significant. Of the children with hypodontia, 86.6% lacked only one or two permanent teeth. The most frequently missing teeth were the mandibular second premolars, the maxillary second premolars, and the maxillary lateral incisors, in that order. Classification of children with hypodontia according to need of orthodontic treatment showed that about two-thirds had hypodontia only of single posterior teeth with a moderate need of treatment. About one-third had hypodontia involving anterior teeth, and only 3.1% had hypodontia of two or more teeth in the same quadrant with a great need of treatment.

[The clinico-radiological assessment of dental anomalies with real and apparent numerical defects]. / Valutazione clinico-radiologica delle anomalie dentarie di numero in difetto reali ed apparenti.

Dental anomalies involving real shortfall in the number of teeth (agenesis) or apparent deficiency (impaction) have been studied in a population sample including 700 national servicemen aged between 19 and 26, in the period April-August 1989. The study was carried out by means of careful objective examination and the systematic performance of orthopantomography showed that 5.14% of the population examined is affected by dental agenesis. The tooth most often involved in agenesis is the lateral maxillary incisor followed by the third mandibular molar, the second mandibular premolar and the second maxillary premolar. As regards apparent agenesis, the upper and lower wisdom teeth were the most frequently involved in physiological or pathological bone impaction (this event occurs in almost 50% of third molars). The maxillary cuspid is also impacted with some frequency. The data obtained were compared with those in the world literature.

Prevalence of malocclusion and need for orthodontic treatment in Saudi Arabia.

The prevalence of different malocclusion features was investigated in 500 14-yr-old male Saudi Arabian children, using a modification of the registration method described by Björk et al. (3). Most of the children were in dental stage DS4 (all permanent teeth anterior to the first molars erupted). Totally 62.4% of the children had one or more malocclusion features related to dentition, occlusion, or space. The treatment need was evaluated according to the guidelines used in the Norwegian Health Service. About 40% were found to need treatment with fixed appliances, and for 33% extraction of permanent teeth would be part of the treatment. Only about 2.5% would benefit from treatment with simple removable appliances.