Effect of low-level laser therapy after rapid maxillary expansion: a clinical investigation.

To evaluate the effectiveness low-level laser therapy (LLLT) on the repair of the mid palatal suture, after rapid maxillary expansion (RME). A single-operator, randomized single-blind placebo-controlled study was performed at the Orthodontic Department at the Dental Hospital of Bellvitge. Barcelona University, Hospitalet de Llobregat, Spain. Thirty-nine children (range 6-12 years old), completed RME and were randomized to receive active LLLT (n = 20) or placebo (n = 19). The laser parameters and dose were 660 nm, 100 mW, CW, InGaAlP laser, illuminated area 0.26 cm(2), 332 mW/cm(2), 60 s to four points along midpalatal suture, and 30 s to a point each side of the suture. A total of seven applications were made on days 1, 7, 14, 28, 42, 56, and 70 of the retention phase RME. A cone beam computed tomography (CBCT) scan was carried out on the day of the first laser treatment, and at day 75, a second CBCT scan was performed. Two radiologists synchronized the slices of two scans to be assessed. P = 0.05 was considered to be statistically significant. At day 75 of the suture, the irradiated patients presented a greater percentage of approximate zones in the anterior (p = 0.008) and posterior (p = 0.001) superior suture-and less approximation in the posterior superior suture (p = 0.040)-than the placebo group. LLLT appears to stimulate the repair process during retention phase after RME.

Microleakage in Class V cavities with self-etching adhesive system and conventional rotatory or laser Er,Cr:YSGG.

OBJECTIVE: To analyse microleakage in Class V cavity preparation with Er;Cr:YSGG at different parameters using a self-etching adhesive system. BACKGROUND: Several studies reported microleakage around composite restorations when cavity preparation is done or treated by Er;Cr:YSGG laser. We want to compare different energy densities in order to obtain the best parameters, when using a self-etching adhesive system. METHODS: A class V preparations was performed in 120 samples of human teeth were divided in 3 groups: (1) Preparation using the burr. (2) Er;Cr:YSGG laser preparation with high energy 4W, 30 Hz, 50% Water 50% Air and (3) Er;Cr:YSGG laser preparation lower energy 1.5 W, 30 Hz, 30% Water 30% Air. All the samples were restored with self-etching adhesive system and hybrid composite. Thermocycling (5000 cycles) and immersed in 0.5% fuchsin. The restorations were sectioned and evaluated the microleakage with a stereomicroscope. RESULTS: Lower energy laser used for preparation showed significant differences in enamel and dentin. To group 3, the microleakage in the enamel was less, whilst the group 1, treated with the turbine, showed less microleakage at dentin level. Group 2 showed the highest microleakage at dentin/cement level. CONCLUSION: Burr preparation gives the lowest microleakage at cement/dentin level, whilst Er;Cr:YSGG laser at lower power has the low energy obtains lowest microleakage at enamel. On the contrary high-energy settings produce inferior results in terms of microleakage.

El surco de desarrollo radicular como causa de fracaso endodóncico: a propósito de un caso / Root development sulcus as a cause for endodontic treatment failure: a case report

El surco de desarrollo radicular es una anomalía dentaria de origen embriológico presente en el 8,5% de la población que se localiza principalmente en la cara palatina de los incisivos laterales superiores. Este surco se origina en la fosa central y atravesando el cíngulo se dirige hacia el ápice, siendo su longitud variable. A través de él, los microorganismos penetran en el ligamento periodontal, causando una destrucción ósea localizada. Clínicamente los dientes afectados por esta anomalía pueden ser asintomáticos o bien presentar patología periodontal, pulpitis o necrosis pulpar por afectación secundaria de la pulpa. Presentamos el caso de una paciente que acudió a nuestro Servicio para realizarse la cirugía periapical del 1.2. En el examen físico se detectó y se exploró el surco. Asimismo, también se observó que el tratamiento de conductos era correcto y no existía patología a nivel periapical. Se decidió efectuar una cirugía exploratoria donde se comprobó la presencia de un surco de desarrollo radicular. El tratamiento final efectuado fue la exodoncia. El pronóstico de estos dientes es incierto, dependiendo de la profundidad y de la extensión apical del surco radicular, así como de la higiene bucal del paciente. Diversos autores han intentado el tratamiento mediante la eliminación del tejido de granulación, odontoplastia y la aplicación de ácido cítrico, el sellado del surco con amalgama, o el uso de hidroxiapatita y técnicas de regeneración tisular guiada pero en la mayoría de los casos el tratamiento de elección continúa siendo la exodoncia

The radicular growth groove is an embriologic dental anomaly that affects the 8,5 % of the population. It is located in the palatal face of the maxillary lateral incisors. This groove begins in the central fossa, runs through the cingulum and arrives to the apex, having a variable length. The microorganisms can penetrate to the ligament periodontal through the groove, causing local bone destruction. These teeth can be asymptomatic, can present periodontal patology, pulpitis or pulp necrosis due to the secondary affectation of the pulp. We present the case of a patient that came to our clinic to do the periapical surgery of the right maxillary lateral incisor. We detected and explored the groove in the physic exam. We observed that the endodontic treatment was correct too and it didn't exist periapical patology. We decided to do an exploratory surgery where we saw the radicular growth groove. The final treatment was the extraction of the tooth. The prognosis of these teeth is uncertain and it depends on the depth and length of the radicular growth groove and on the oral hygiene of the patient. Some authors have attempted the treatment removing the inflamatory tissue, doing an odontoplasty and applying citric acid, sealing the groove with amalgam or using hidroxiapatite and guided tissular regeneration technics, but in most of the cases the extraction of the tooth is the election treatment