Influence of interimplant distances and placement depth on papilla formation and crestal resorption: a clinical and radiographic study in dogs.

Among the factors that contribute to the papilla formation and crestal bone preservation between contiguous implants, this animal study clinically and radiographically evaluated the interimplant distances (IDs) of 2 and 3 mm and the placement depths of Morse cone connection implants restored with platform switch. Bilateral mandibular premolars of 6 dogs were extracted, and after 12 weeks, the implants were placed. Four experimental groups were constituted: subcrestally with ID of 2 mm (2 SCL) and 3 mm (3 SCL) and crestally with ID of 2 mm (2 CL) and 3 mm (3 CL). Metallic crowns were immediately installed with a distance of 3 mm between the contact point and the bone crest. Eight weeks later, clinical measurements were performed to evaluate papilla formation, and radiographic images were taken to analyze the crestal bone remodeling. The subcrestal groups achieved better levels of papillae formation when compared with the crestal groups, with a significant difference between the 3 SCL and 3 CL groups (P = .026). Radiographically, the crestal bone preservation was also better in the subcrestal groups, with statistically significant differences between the 2SCL and 2CL groups (P = .002) and between the 3SCL and 3CL groups (P = .008). With the present conditions, it could be concluded that subcrestal implant placement had a positive impact on papilla formation and crestal bone preservation, which could favor the esthetic of anterior regions. However, the IDs of 2 and 3 mm did not show significantly different results.

The bone formation capabilities of the anorganic bone matrix-synthetic cell-binding peptide 15 grafts in an animal periodontal model: a histologic and histomorphometric study in dogs.

BACKGROUND: The aim of this study is to verify the regenerative potential of particulate anorganic bone matrix-synthetic peptide-15 (ABM-P-15) in class III furcation defects associated or not with expanded polytetrafluoroethylene membranes. METHODS: Class III furcation defects were produced in the mandibular premolars (P2, P3, and P4) of six dogs and filled with impression material. The membranes and the bone grafts were inserted into P3 and P4, which were randomized to form the test and control groups, respectively; P2 was the negative control group. The animals were sacrificed 3 months post-treatment. RESULTS: Histologically, the complete closure of class III furcation defects was not observed in any of the groups. Partial periodontal regeneration with similar morphologic characteristics among the groups was observed, however, through the formation of new cementum, periodontal ligament, and bone above the notch. Histologic analysis showed granules from the bone graft surrounded by immature bone matrix and encircled by newly formed tissue in the test group. The new bone formation area found in the negative control group was 2.28 + or - 2.49 mm(2) and in the test group it was 6.52 + or - 5.69 mm(2), which showed statistically significant differences for these groups considering this parameter (Friedman test P <0.05). There was no statistically significant difference among the negative control, control, and test groups for the other parameters. CONCLUSIONS: The regenerative potential of ABM-P-15 was demonstrated through new bone formation circumscribing and above the graft particles. The new bone also was accompanied by the formation of new cementum and periodontal ligament fibers.

Aumento de coroa estético associado ao reposicionamento labial com cimento ortopédico / Aesthetic crown lengthening combined with lip repositioned using bone cement

O sorriso gengival é uma das queixas mais comuns dos pacientes em relação à estética. De acordo com as diferentes etiologias diversos tipos de tratamento são propostos. O objetivo deste relato de caso é descrever uma técnica de tratamento desorriso gengival, utilizando o aumento de coroa estético, associado ao reposicionamento do lábio com o uso de cimento ortopédico. Concluiu-se que o aumento de coroa estético associado ao reposicionamento labial com cimento ortopédico é uma técnica inovadora e adequada para tratamento de sorriso gengival por falta de suporte labial.

The gummy smile is one of the most common complaints of patients regarding aesthetics. According to the different etiologies, several treatments are sought to resolve this complaint. This report describes a different technique to increase crown aesthetic associated with the repositioning of the lip with the use of orthopedic cement. It was concluded that is an innovative and suitable technique for treatment of gummy smile due to lack of lip support.

Retalho posicionado lateralmente e enxerto de tecido conjuntivo subeptelial no tratamento das recessões teciduais marginais / Laterally positioned flap and subepithelial connective tissue graft for marginal tissue recession treatment

Introdução: As cirurgias mucogengivais têm sido amplamente utilizadas para o tratamento de problemas periodontais. Nos casos de recobrimento radicular diversas são as técnicas utilizadas, dentre elas, o retalho posicionado lateralmente (RPL) e o enxerto de tecido conjuntivo subepitelial (ETCS). Objetivo: Apresentar um caso clínico de recobrimento radicular no qual foram utilizadas conjuntamente as técnicas de RPL e ETCS. Relato: Paciente procurou tratamento periodontal com queixa principal de sensibilidade dental. Foram observadas recessões classe I de Miller nos dentes 23, 24 e 25 e faixa de tecido queratinizado de 1 mm na região dos dentes em questão. A técnica escolhida para tratamento das recessões foi o enxerto de tecido conjuntivo associado ao retalho posicionado lateralmente. Resultados: Após 35 dias observou-se completa cobertura da superfície radicular e ganho de tecido queratinizado de 4 a 5 mm.

Introduction: Mucogingival surgeries have been widely used for the treatment of periodontal problems. In cases of root coverage many techniques are used, among them, the laterally positioned flap (LPF) and subepithelial connective tissue graft (SCTG). Objective: To present a clinical case of root coverage in which was used together the techniques of LPF and SCTG. Report: The patient sought for periodontal treatment complaining of tooth sensitivity. It was observed Miller Class I recessions on teeth 23, 24 and 25 and 1 mm of keratinized tissue track in the region of these teeth. The technique used for treatment of recessions was the connective tissue graft associated with the laterally positioned flap. Results: After 35 days was observed complete coverage of the root surface and keratinized tissue gain 4 to 5 mm.