Bond strength of composite resin/universal adhesive to dentin submitted to radiotherapy / Fuerza de unión de resina compuesta/adhesivo universal a dentina sometida a radioterapia

Aim: To evaluate the bond strength of a universal adhesive system to dentin submitted to radiotherapy. Materials and Methods: Sixty extracted human teeth were divided into two groups (n = 30): without radiotherapy (control); with radiotherapy, according to the adhesive protocol (n=15): ER-etch-and-rinse (acid + Single Bond Uni-versal); SE-self-etch (Single Bond Universal). The analyzes were shear bond strength (SBS) (n=10), failure pattern (n=10) and scanning electron microscopy (n=5). Data was analyzed by a two-way ANOVA (α =0.05). Results: The radiotherapy decreased SBS of the restorative material to dentin (p<0.0001). The ER protocol provided lower bond strength values (p<0.001). The predominant type of fracture without radiotherapy was mixed (SE), cohesive to the material (ER). Both protocols presented adhesive failures with radiotherapy. Teeth had a hybrid layer and long resin tags (without radiotherapy) and few tags (with radiotherapy). Conclusions: The SE adhesive mode favors the shear bond strength of resin to dentin in teeth submitted to radiotherapy.

Objetivo: Evaluar la fuerza de adhesión de un sistema adhesivo universal a la dentina sometida a radioterapia. Materiales y Métodos: Sesenta dientes humanos extraídos se dividieron en dos grupos (n = 30): sin radioterapia (control); con radioterapia, según protocolo adhesivo (n=15): ER-grabado y enjuague (ácido + Single Bond Universal); autograbado SE (Single Bond Universal). Los análisis ejecutados fueron resistencia al cizallamiento (SBS) (n=10), patrón de falla (n=10) y microscopía electrónica de barrido (n=5). Los datos se sometieron al test de ANOVA de dos vías (α =0,05). Resultados: La radioterapia disminuyó la SBS del material restaurador a la dentina (p<0,0001). El protocolo ER proporcionó valores de fuerza de unión más bajos (p<0,001). El tipo de fractura predominante sin radioterapia fue mixta (SE), cohesiva al material (ER). Ambos protocolos presentaron fallas adhesivas con radioterapia. Los dientes tenían una capa híbrida y colas de resina largas (sin radioterapia) o pocas colas de resina (con radioterapia). Conclusión: El modo adhesivo SE favorece la resistencia al corte de la resina a la dentina en dientes sometidos a radioterapia.

RUNX2 Nonsense Mutation Associated with Cleidocranial Dysplasia with Unusual Dental Features.

Purpose: The purpose of this case report is to describe a RUNX2 nonsense mutation associated with cleidocranial dysplasia (CCD) with unusual dental features. The patient was a 12-year-old Brazilian girl who sought dental care due to over-retention of primary teeth and absence of erupted permanent teeth. Clinical and radiographic examinations revealed multiple impacted permanent teeth, a prominent cingulum of the permanent impacted maxillary incisors and enamel defects (hypoplasia and hypomineralization) in addition to skeletal abnormalities. No supernumerary teeth were present. The diagnostic hypothesis of CCD was raised and the patient was refer- red to the genetic medical service, where the diagnosis was cofirmed. After RUNX2 genetic screening, including polymerase chain reaction and sequencing of both DNA strands, a heterozygous nonsense mutation was identified in exon 2 (c.193 C>T [Q65X]). This article reports unusual dental features in a patient with CCD.

Accuracy of Conventional Periapical Radiography in Diagnosing Furcation Repair after Perforation Treatment.

INTRODUCTION: Periapical radiography (PR) is a diagnostic tool to be used by professionals in clinical practice. The method presents limitations, and doubts still exist about its value to evaluate furcation perforation and the reparative process of hard or soft tissues after treatment. Thus, the aim of this study was to evaluate the accuracy of PR as a diagnostic method to detect both resorption of the furcation area after induced experimental perforation and repair after perforation treatment using histopathological findings as a gold standard. METHODS: Thirty teeth of beagle dogs with furcation perforation were filled with Biodentine (Septodont, Saint-Maur-des-Fossés, France), ProRoot White mineral trioxide aggregate (Dentsply Tulsa Dental Specialties, Tulsa, OK), or gutta-percha and examined using PR and histology. Sensitivity, specificity, predictive values, and accuracy were calculated. RESULTS: PR detected repair and reabsorption of furcation perforation in 55% and 48% of the teeth, respectively. Histologic analysis showed furcation perforation in 66% and 21% of the teeth, respectively. Sensitivity and specificity of PR for the detection of repair were 0.84 and 1, respectively, whereas for resorption detection, the values were 0.43 and 0.65, respectively. Diagnostic accuracy for PR was 0.89 and 0.72 for repair and resorption of furcation perforation, respectively. PR showed more accurate diagnostic (true positives + true negatives/total) in repair detection compared with resorption of furcation perforation. CONCLUSIONS: We conclude that PR is not adequate in detecting resorption progress after the treatment of furcation perforation, and we encourage the use of digital imaging when suspicious of a possible unsuccessful result after furcation perforation treatment.

Aspectos odontológicos en paciente portador del síndrome de Mobius: relato de caso / Dental aspects of a patient with Mobius syndrome: case report

El síndrome de Mobius se caracteriza por la parálisis congénita y no progresiva de los nervios craneanos facial y abducentes cuyas manifestaciones clínicas principales son la apariencia facial estática y poco expresiva, el estrabismo bilateral convergente y la hipoplasia de miembros, entre otras. En la cavidad bucal puede observarse micrognacia, implantación heterotrófica de la lengua, anquiloglosia, úvula bífida, fisura palatina y anomalías dentales. La etiología del síndrome de Mobius es poco conocida y algunos relatos de la literatura señalan, como la hipótesis más probable, una isquemia fetal transitoria, durante el período de formación de los núcleos craneanos. Los posibles factores causales de esta isquemia serian los de orden ambiental, los disturbios fisiopatológicos y genéticos, o el uso ilícito de drogas como el Misoprostol, durante la gestación. El presente trabajo relata el tratamiento odontológico realizado en una paciente portadora de este síndrome enfatizando las particularidades observadas durante la atención, en función de las características propias de esa entidad clínica

Mobius syndrome is characterized by congenital and non-progressive paralysis of the facial and abducent cranial nerves. The principal manifestations of this syndrome are lack of facial expression, convergent bilateral strabismus and hypoplastic members. The oral findings include micrognatia, heterotrophic implantation of the tongue, ankyloglossia, bifid uvula, cleft palate and dental anomalies. The etiology of Mobius syndrome is unknown and some reports relate, as a main cause, the transitory fetal ischemia during the formation of cranial nucleus. The factors that lead to this ischemia are from ambient, physiopathological or genetic disturbs and use of drugs like Misoprostol during the pregnancy. This paper reports the dental treatment of a female patient with Mobius syndrome, emphasizing the peculiarities observed due to the characteristics of this clinical entity

Ojal quirúrgico (ulectomía) ¿cuando y como realizarlo?: reporte de 3 casos clínicos / Ulectomy: when and how to apply?: three case reports

En este trabajo es descrita la técnica de la ulectomía en pacientes con erupción dental retardada debido a fibrosis de la mucosa gingival. Son relatados aspectos relacionados al diagnóstico e indicación precisa de la técnica, a los exámenes clínico y radiográfico de la región, y presentados tres casos con resultados exitosos, después de la realización deste procedimento quirúrgico

In this study we describe the ulectomy in patients with retarded dental eruption due the fibrosis of the encíal mucosa. After clinical and radiographic exams of the area, and the presentation of three successful cases obtained after that surgical procedure, aspects relation with diagnosis and precise indication of that technique were related