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Objective: to report a rare case of impaction of a primary mandibular incisor due to the presence of a compound odontoma and describe its clinical management. Case report: a 4-year-old boy presented with a“missing” primary left mandibular lateral incisor. Radiographs showed impaction of the unerupted incisorby adjacent radiopaque structures consistent with a compound odontoma. The patient was recalled periodically for 2 years, at which time surgical excision was performed. The diagnosis of compound odontoma was confirmed histologically, and the permanent mandibular central incisors erupted uneventfully; the patient was referred for orthodontic treatment. Final considerations: this case report describes an unusual case of compound odontoma associated with an unerupted deciduous tooth; odontomas are rare in this age range, occurring predominantly in the second decade of life and in association with impaction of permanent teeth. We also propose a protocol for clinical management of such early-onset cases.

Objective: To investigate the prevalence of morphological and attachment variations of the maxillary labial frenum (MLF) and associated factors in preschool children. Study Design: A cross-sectional study was conducted with 1,313 children aged between zero and five years of age attending public nurseries in the city of Canoas in southern Brazil. Data were collected through a questionnaire addressing demographic, socioeconomic, and behavioral characteristics and a clinical examination of the MLF. Assessments of MLF morphology and attachment were based on the classification systems proposed by Sewerin and Mirko et al., respectively. Results: The most prevalent patterns were simple MLF (63.8%) and gingival attachment (51.1%). Morphological abnormalities were found in 21.6% of the preschoolers and 25.4% exhibited abnormal frenal attachment. Abnormalities in MLF morphology were more prevalent among girls (p = 0.003) and a significant reduction was found with the increase in age (p < 0.001). Attachment abnormalities were significantly more prevalent among girls (p < 0.001), the white ethnic group (p = 0.005), and children who used a pacifier (p = 0.007) and also reduced significantly with the increase in age (p < 0.001). Conclusion: Demographic and behavioral characteristics were associated with MLF morphology and attachment. The reduction in the prevalence of the outcomes with the increase in age suggests that surgical interventions in the first years of life may constitute overtreatment.

Estimate the prevalence of developmental defects of enamel (DDE) in the primary dentition, describe the distribution among tooth groups and investigate the association with birth weight. A cross-sectional study was conducted with a sample of 827 children aged 2–5 years representative of the city of Canela in southern Brazil. Demographic characteristics (gender and age) and birth weight were collected from vaccination cards. The diagnosis of DDE was performed by six trained examiners following the criteria of the Federation Dentaire International. DDE were described both jointly and separately as opacity and hypoplasia. Statistical analysis involved the Chi square test, Mann–Whitney test and Poisson regression with robust variance. The prevalence of DDE was 55.1% (95% CI 51.6–58.5%), with a mean of 3.0 ± 2.2 teeth affected. Opacity was the more frequent defect (50.4%), followed by hypoplasia (15.5%). Distribution of the defects was uneven, with opacity predominant on second molars and hypoplasia predominant on canines and second molars. Children with a low birth weight did not have a greater probability of opacity (PR: 1.13; 95% CI 0.91–1.41), hypoplasia (PR: 1.33; 95% CI 0.80–2.22) or DDE (PR: 1.11; 95% CI 0.91–1.37). The prevalence of DDE was high, predominant on second molars and not associated with birth weight. These findings indicate directions for future examination/diagnosis protocols and specific orientations.

The occurrence of hypodontia (absence of teeth) and hyperdontia (presence of supernumerary teeth) in the same patient is a rarely seen condition in dental practice. Early diagnosis and adequate treatment are very important when addressing this abnormality in the mixed dentition. The approach will depend on the severity of the case and the timing of diagnosis. This paper reports the case of an 11-year-old patient with absence of the permanent maxillary lateral incisors and the mandibular second premolars, with concomitant presence of a supernumerary tooth in the region of the right mandibular lateral incisor. Based on physical and radiographic examination findings, a diagnosis of hypo-hyperdontia was made. The diagnostic and therapeutic management of the case is discussed. The treatment adopted was surgical removal of the supernumerary teeth and esthetic restoration to transform the permanent mandibular canines into lateral incisors.

The aim of this study was to analyze the structural characteristics of the mineralized dental tissues - enamel,dentin and cementum - in primary teeth and to correlate the histological aspects observed in function of the dental type – single-rooted or multi-rooted. Method: Eighteen human primary noncarious teeth were sectioned in facial-lingual (single-rooted) and mesio-distal direction (multi-rooted). One to three samples from each tooth were obtained. The samples were prepared by the ground technique and analyzed under light microscopy at different magnifications. A quantitative and descriptive analysis of the morphology of the mineralized tissues was performed. Results: Spindles, tufts and lamellae were consistently observed mainly in the occlusal surface of the primary molars. The scalloped pattern of the dentinoenamel junction was not always present. The same was seen for zones of interglobular dentin. Dead tracts in dentin and tertiary dentin were observed mainly in single-rooted teeth below areas of dental attrition. Areas of cellular and acellular cementum were observed in the two dental types. Conclusions: Primary teeth have some structural peculiarities and these should be investigated concerning the clinical repercussion.

A erupção dentária depende de um equilíbrio fisiológico, sendo assim, um atraso ou uma erupção precoce podem indicar alguma alteração nesse processo. Diferentes são os fatores que alteram a cronologia normal de erupção, podendo ser estes de ordem local, sistêmicos ou relativos ao meio ambiente. OBJETIVOS: Neste artigo, apresenta-se o caso de uma paciente, de 11 anos de idade, com retenção prolongada de segundos molares decíduos inferiores e consequente erupção retardada dos sucessores permanentes. MÉTODO: Serão discutidos os aspectos mais relevantes desta alteração, enfatizando seu tratamento, possíveis fatores etiológicos, bem como sua resolução clínica. RESULTADOS: A abordagem do caso envolveu a exodontia dos segundos molares decíduos e teve como proposta uma melhor condução clínica, considerando-se o planejamento ortodôntico prévio. CONCLUSÃO: O correto diagnóstico, por meio da anamnese, exame clínico e radiográfico devem ser realizados, assim como também medidas para impedir a erupção retardada e a impactação dos dentes permanentes sucessores.

Resumen pt: Objetivo: Avaliar a eficacia de duas tecnicas de uso de fio dental na remocao da placa bacteriana interproximal e a ocorrencia de traumatismo na papila g...

Resumen pt: Objetivo: Avaliar as caracteristicas morfofuncionais da denticao decidua em pre-escolares matriculados nas Escolas Municipais de Educacao Infantil de Can...

O objetivo deste estudo foi avaliar a resistência de união à dentina de primeiros e segundos molares decíduos de sistemas adesivos baseados no condicionamento ácido total e autocondicionantes e analisar a interface de união adesiva sob microscopia eletrônica de varredura. Amostras de dentina de 35 a 65% de distância pulpar (dentina intermediária) foram obtidas do terço médio das faces vestibular e lingual/palatina de 108 molares decíduos, mediante corte com disco diamantado de dupla-face, sob refrigeração. Posteriormente, as superfícies dentinárias foram polidas com lixas de carboneto de silício de granulação 400 e 600. Cinco sistemas adesivos foram empregados nas amostras dos primeiros e segundos molares (n=15/grupo): Adper Single Bond; Prime & Bond NT; AdheSE; Clearfil SE Bond; Adper Prompt L-Pop. Os corpos de prova foram confeccionados com a resina composta Filtek Z250, com uma área de adesão de 2 mm de diâmetro. Após 24 hs de armazenagem em água destilada a 37ºC, fez-se o ensaio de tração a 0,5 mm/min. Na análise da interface de união adesiva entre sistema adesivo e dentina, 50 amostras foram preparadas com os mesmos materiais descritos acima (n=5/grupo). Não foram observadas diferenças estatisticamente significantes entre primeiros (16,02±5,23 MPa) e segundos (16,03±5,05 MPa) molares (ANOVA:p=0,2721). Os valores médios em MPa obtidos para os sistemas adesivos testados foram de 14,32±3,57 (Adper Single Bond), 15,65±3,70 (Prime & Bond NT), 19,47±7,09 (AdheSE), 17,14±5,35 (Clearfil SE Bond) e 14,22±3,20 (Adper Prompt L-Pop). O sistema adesivo AdheSE apresentou o maior valor e diferença estatisticamente significante com os demais grupos (Tukey=3,47), com exceção do Clearfil SE Bond, com o qual não diferiu estatisticamente. Nas demais comparações não foram encontradas diferenças estatísticas significativas. A análise ao microscópio eletrônico de varredura demonstrou a formação de camada híbrida e “tags" em todos os sistemas adesivos e nos dois tipos dentários The aim of this study was to evaluate bond strength of self-etching and total-etching adhesive systems to dentin of first and second primary molars and to analyze the adhesive interface under scanning electron microscopy. Dentin samples pulp distant 35% to 65% (intermediate dentin) were obtained from buccal and lingual surfaces at the middle third of the crown of 108 primary molars by sectioning with a diamond-impregnated disc under water cooling. Dentin surfaces were polished with 400 and 600-grit silicon carbide paper under running water. Five adhesive systems were tested on the first and second primary molar surfaces (n=15/group): Adper Single Bond; Prime & Bond NT; AdheSE; Clearfil SE Bond; Adper Prompt L-Pop. Inverted, truncated cones of resin composite (Filtek Z250) were built with a 2.0 mm bonding diameter. After 24-hour storage in distilled water at 37°C, the specimens were submited to the tensile test at a crosshead speed of 0.5 mm/min. To analyze adhesive interface 50 samples were prepared with the same protocol described above (n=5/group). No differences between first (16.02±5.23 MPa) and second (16.03±5.05 MPa) primary molars bond strength values could be observed (ANOVA:P=0.2721). Bond strength mean values registered in MPa obtained were 14.32±3.57 (Adper Single Bond), 15.65±3.70 (Prime & Bond NT), 19.47±7.09 (AdheSE), 17.14 ±5.35 (Clearfil SE Bond) and 14.22±3.20 (Adper Prompt L-Pop). AdheSE adhesive system presented the greatest bond strength values statistically different to the other groups (Tukey=3.47), while no statistically significant difference was observed for Clearfil SE Bond. In the other comparisons no differences were found. Scanning electron microscopy analysis showed the presence of hybrid layer and tags in all adhesive systems on both dentin types

The purpose of this article was to present a rare case of epidermoid cyst on the ventral region of the tongue in a 15-month-old child. During clinical examination, a sessile, yellowish lesion measuring approximately 0.5 cm was noticed. The lesion had existed since the child's birth and was causing discomfort due to friction of the tongue against the alveolar ridge during mastication. The chosen treatment was total removal of the lesion. The histopathological findings confirm the diagnosis of an epidermoid cyst, characterized by the presence of: (1) a cyst cavity lined by stratified squamous epithelium with keratinization on the surface; and (2) connective tissue with a mild inflammation. The proposed treatment was considered successful as the case was solved and there was no recurrence.

The aim of the present survey was to evaluate the dentin thickness of buccal, lingual, mesial and distal surfaces of first and second primary molars. These evaluations were done at the middle third of the crowns of twenty extracted non-carious primary teeth separated in two groups (first molars and second molars). Comparisons were performed within-groups and between-groups. The mean values of dentin thickness observed for first molars were 2430 mm (buccal), 1.869 mm (lingual), 1.655 mm (mesial) and 1.664 mm (distal). For second molars the dentin thickness presented 3.006 mm (buccal), 2730 mm (lingual), 2130 mm (mesial) and 2192 mm (distal). The dentin thickness was higher in the buccal surface in both groups (P0.05; Wilcoxon Test), except for the lingual surface of second molars (P0.05). No differences were observed between mesial and distal surfaces in both groups (P0.05). Comparisons between-groups showed that the dentin thickness was higher in all surfaces of second molars (P0.01; Mann-Whitney Test). It was concluded that there are differences in the dentin thickness between first and second primary human molars and within the different surfaces of such teeth.