ABSTRACT
Objetivo: Analizar la resistencia de unión a dentina sana y desmineralizada, en forma inmediata y a los 6 meses, utilizando un pretratamiento de clorhexidina (CHX) 2%. Método: 40 terceros molares sanos con desarrollo radicular incompleto se desgastaron exponiendo dentina. Las piezas fueron sometidas a ciclado de pH. Se dividieron aleatoriamente en 2 grupos: con y sin CHX. En dentina se crearon 4 botones de resina utilizando adhesivo universal mediante autoacondicionamiento. Las muestras se almacenaron en agua destilada a 37ºC hasta su análisis. El microcizallamiento se ejecutó a las 24 horas y a los 6 meses de envejecimiento. Resultados: El grupo de dentina sana, sin CHX inmediato presentó mayor resistencia adhesiva (23,37±1,84). El grupo de dentina desmineralizada, sin CHX, envejecido presentó la menor resistencia adhesiva (8,87±1,51). Conclusiones: La CHX al 2% previo a la aplicación del adhesivo no mejora los valores de resistencia de unión a dentina sana ni desmineralizada a corto o largo plazo.
Objetivo: Analisar a resistência de união à dentina hígida e desmineralizada, imediatamente e após 6 meses, utilizando um pré-tratamento com (CHX) a 2%. Método: 40 terceiros molares hígidos com desenvolvimento radicular incompleto foram desgastados expondo a dentina. As peças foram submetidas a ciclagem de pH. Eles foram divididos aleatoriamente em 2 grupos: com e sem CHX. Em dentina, foram criados 4 botões de resina utilizando adesivo universal em modo autocondicionante. As amostras foram armazenadas em água destilada a 37ºC até a análise. O microcisalhamento foi realizado às 24 horas e aos 6 meses de envelhecimento. Resultados: O grupo de dentina saudável, sem CHX imediata apresentou maior resistência adesiva (23,37±1,84). O grupo de dentina desmineralizada, sem CHX , envelhecida apresentou a menor resistência adesiva (8,87±1,51). Conclusões : A CHX antes da aplicação do adesivo não melhoraria os valores de resistência de união em dentina saudável ou desmineralizada a curto ou longo prazo.
Objective: To analyze the bond strength to healthy and demineralized dentin, immediately and after 6 months, using a 2% chlorhexidine (CHX) pretreatment. Method : 40 healthy third molars with incomplete root development were abraded exposing dentin. The pieces were subjected to pH cycling. They were randomly divided into 2 groups: with and without CHX. In dentin, 4 resin buttons were created using universal adhesive in self-etching mode. The samples were stored in distilled water at 37ºC until analysis. Micro shearing was carried out at 24 hours and at 6 months of aging. Results: Healthy dentin group, without immediate CHX presented higher bond strength (23.37±1.84). (Demineralized dentin group, without CHX, aged) presented the lowest bond strength (8.87±1.51). Conclusions : CHX prior to adhesive application doesn't improve bond strength values to healthy or demineralized dentin in short nor long term.
ABSTRACT
OBJECTIVE@#To evaluate the clinical effect of root canal obturation therapy using cold flowable gutta-percha on young permanent teeth after apexification.@*METHODS@#Ninety cases of young permanent teeth with pulp necrosis or periapical periodontitis treated by apexification were randomly divided into two groups. The cases in each group were divided into single root canal and multiple root canal according to the number of the root canal, and divided into classifications Ⅰ, and Ⅱ/Ⅲ/Ⅳ according to Frank's classification of root development after apexification. Cold flowable gutta-percha and warm gutta-percha obturation techniques were used for root canal obturation of the two groups. The operation time was recorded, and the patients' therapy pain degree was evaluated by visual analog scale (VAS) immediately after operation. Periapical X-ray was performed after operation to evaluate the effect of the root canal filling. The total length of the root was divided into equal three parts on the X-ray film, and three-dimensional tightness of the apical, middle, and coronal region of the root canals were statistically analyzed respectively. Clinical examinations and X-ray examination were performed 6 and 12 months after the operation to evaluate the treatment success rate.@*RESULTS@#The operation time of cold flowable gutta-percha group was significantly lower than that of the control group, which were 51 s and 74 s (P < 0.05); The percentages of pain and discomfort in the two groups were 26.67% and 40.00%, respectively. There were two cases of underfilling and no overfilling in both groups. The percentages of proper filling and tight three-dimensional obturation in the experimental and control groups were 71.11% and 60.00% respectively; and the percentages of tight three-dimensional obturation in the apical third areas were 86.67% and 66.67%, the difference was significant (P < 0.05). There was no significant difference in the three-dimensional tightness between the two groups in the middle and coronal third areas. The percentages of tight three-dimensional obturation in classification Ⅰ groups were 86.67%, 83.33%, 93.33% and 76.67%, 90.00%, 96.67% in experimental and control group, respectively; The percentages of classification Ⅱ/Ⅲ/Ⅳ groups were 86.67%, 86.67%, 100.00% and 46.67%, 86.67%, 100.00%, respectively, and the difference was significant (P < 0.05). There were no apical lesions that occurred in either group during the one-year review period.@*CONCLUSION@#The application of cold flowable gutta-percha on young permanent teeth root canal obturation after apexification can achieve good obturation effect. The root obturation effect in the apical third area is significantly better than that of warm gutta-percha obturation techniques. Cold flowable gutta-percha can shorten the clinical treatment time and ameliorate the patients' therapy comfort.
Subject(s)
Humans , Apexification , Dental Pulp Cavity , Gutta-Percha , Radiography , Root Canal Filling Materials , Root Canal Obturation , Root Canal PreparationABSTRACT
La pulpa dental es un tejido conectivo laxo de características especiales que mantiene íntima relación con la dentina, la que la rodea y con la que constituye una unidad funcional denominada complejo pulpodentinario. La misma se ubica en el interior de las piezas dentarias y cumple funciones tales como: inducción, sobre todo durante la formación del diente induce a las células vecinas para que se generen los tejidos que rodean al mismo; formación, la pulpa forma dentina y la sigue formando durante toda la vida del diente; reparación, ya que reacciona ante agentes externos; función metabólica porque la dentina es un tejido vivo en permanente formación; y función sensitiva ya que está inervada con receptores de dolor. La capacidad para elaborar dentina es permanente y ello habilita a la pulpa para reaccionar y protegerse de los agentes agresores asi como para compensar en parte las pérdidas de esmalte o de dentina. La revascularización pulpar es el procedimiento basado en recuperar la vitalidad de un diente inmaduro con pulpa necrótica, permitiendo la reparación de tejidos dentarios, el desarrollo radicular, la deposición de tejido duro en las paredes del conducto, y la formación de un tejido funcional con características histológicas distintas a la pulpa dental. En el presente trabajo se describe un caso clínico de un paciente de 8 años de edad, con pieza dentaria permanente joven sin vitalidad que fue tratada con esta técnica. Durante el seguimiento, se observó la pieza dentaria asintomática, sin respuesta normal a la percusión, desarrollo radicular, aumento de espesor de las paredes dentinarias y de la longitud de la raíz, alcanzando el cierre apical. Por lo tanto, este caso se suma a la creciente evidencia de contar con la revascularización como una opción para el tratamiento de dientes permanentes jóvenes no vitales (AU)
The dental pulp is a connective tissue of special features that keeps intimate relationship with dentin, which surrounds and which constitutes a functional unit called complex pulpodentinario. It is located inside the teeth and performs functions such as induction, especially during tooth formation induces neighboring cells to the tissues surrounding the same are generated; formation, pulp and dentin form continues to form throughout the life of the tooth; repair, as it reacts to external agents; metabolic function because dentin is living tissue in lifelong learning; and sensory function as it is innervated with pain receptors. The ability to produce dentin is permanent and it enables the pulp to react and protect themselves from aggressive agents as well as to partially offset losses enamel or dentin. The pulp revascularization is based on restoring the vitality of an immature tooth with necrotic pulp process , allowing repair of dental tissues , root development , deposition of hard tissue in the canal walls , and the formation of a functional tissue features various histologic the dental pulp . In this work a clinical case of a 8-year- old with young permanent tooth without vitality that was treated with this technique is described. During follow-up, tooth asymptomatic without normal response to percussion, root development , increased thickness of the dentin walls and root length, reaching the apical closure was observed. Therefore, this case adds to the growing evidence of having revascularization as an option for the treatment of non-vital young adult teeth (AU)
Subject(s)
Humans , Female , Child , Dentition, Permanent , Tooth, Nonvital , Dental Pulp , Regenerative Medicine , Argentina , Tooth Fractures , Dental Pulp Necrosis , Dental Service, HospitalABSTRACT
Objective · To observe the effects of custom made fiber posts on the fracture resistance of young permanent teeth treated with calcium hydroxide for different time. Methods · Forty-five extracted human young permanent teeth (premolar) were selected and randomly assigned to 9 groups.One group was the control group and the rest 8 groups were treated with conventional root canal preparation. Of these 8 groups, 4 groups (F Ⅰ , F Ⅲ , F Ⅵ ,FⅨ ) were restored by custom made fiber posts after being treated with calcium hydroxide for 1, 3, 6, and 9 months respectively, and other 4 groups (C Ⅰ ,CⅢ , C Ⅵ , C Ⅸ ) were not restored by custom made fiber posts. All samples underwent fracture strength tests and their fracture modes were analyzed for the possibility of second repair. Results · The fracture load was decreased with the treatment time after being treated with calcium hydroxide for 1 month (P<0.01). The fracture loads in groups restored by custom made fiber posts were increased after being treated with calcium hydroxide for 6 and 9 months (P<0.05, P<0.01). After being treated with calcium hydroxide for 1 month, groups restored by custom made fiber posts were likely to have fracture modes that facilitate the second repair as compared with groups not restored by custom made fiber posts (P<0.05). Conclusion · The restoration by custom made fiber posts can increase the fracture resistance of young permanent teeth treated with calcium hydroxide for medium and long term ( ≥ 1 month).
ABSTRACT
This was a restrospective clinical study of 32 children with fractured anantierior tooth fragments. The teeth was reattached by dual cured resin composite (Panavia F), 3M Z350 resin and 3M siglebond-2 bonding agent for at least 6-month recall examination. Only 2 of the restorations were lost, resulting in a 93.75% overall retention rate. The retention teeth exhibited good esthetics and normal function. The high retention rate in this study suggests that reattachment of fractured anantierior tooth fragments offers a convenient viable restorative option for the clinician.