Survival analysis of dental implants placed in horizontally severely resorbed maxillae after reconstruction with xenogeneic graft: a case series.

PURPOSE: To evaluate the survival rates of dental implants with a hybrid macrostructure and the surface biomimetically coated with nanohydroxyapatite, placed in horizontally atrophic maxillae previously submitted to the guided bone regeneration (GBR) procedure, associated with the use of a deproteinized bovine bone graft (DBB). METHODS: Twenty-five patients who received 196 implants were involved in this study. First, these patients were submitted to GBR procedures and maxillary sinus lift, where DBB was used as the grafting material. The dental implants were placed after a minimum period of 6 months of the grafting procedures. The patients were followed up every six months and clinical/radiographic examinations were performed to assess the implants, using the following indicators as a reference: (1) Absence of mobility; (2) Absence of pain. Data about the age, surgery time, smoking status, implant size, and time between the grafting procedure and implant placement were correlated with implant failures. RESULTS: Twelve implants failed, generating a survival rate of 94.23%. None of the variables analysed correlated with the implant failures. CONCLUSION: Implants with a hybrid macrostructure and surface biomimetically coated with nanohydroxyapatite present good survival rates in horizontally atrophic maxillae grafted with DBB.

Green tea and hyaluronic acid gel enhance fibroblast activation and improves the gingival healing post-third molar extraction.

This study evaluates the effects of a green tea (Camellia sinensis) and hyaluronic acid gel on fibroblast activity and alveolar bone repair following third molar extractions. By examining the gene expression related to cell survival, proliferation, and angiogenesis, the study bridges in vitro findings with clinical outcomes in a split-mouth randomized trial. Human fibroblasts were exposed to the treatment gel, analysing gene expression through RT-qPCR. Twenty participants undergoing bilateral third molar extractions received the test gel on one side and a placebo on the other. Assessments included patient-reported outcomes, professional evaluations, and radiographic analyses at multiple postoperative intervals. The test gel significantly enhanced AKT, CDKs, and VEGF gene expressions, indicating a positive effect on angiogenesis and cell proliferation. Clinically, it resulted in reduced exudate, swelling, and secondary interventions, with radiographs showing improved alveolar bone density after 90 days. The green tea and hyaluronic acid gel significantly improves soft tissue and bone healing post-extraction, offering a promising adjunctive therapy for enhancing postoperative recovery. This gel represents a novel adjuvant treatment option for facilitating improved healing outcomes after third molar extractions, highlighting its potential utility in clinical dental practice.

Effect of a gel containing green tea extract and hyaluronic acid on palate pain scores and wound healing after free gingival graft: a quasi-randomized controlled clinical trial.

OBJECTIVES: The aim of this study was to evaluate the effect of a gel containing green tea extract and hyaluronic acid (HA) on pain scores and wound healing in donor sites after free gingival graft (FGG). MATERIALS AND METHODS: Forty-two patients requiring FGG were included in three groups: (1) control group (n = 14), no material was placed in the donor area; only the clot was kept in position by sutures; (2) placebo group (n = 14), vehicle gel applied 3 times a day for 7 days; and (3) test group (n = 14), gel containing green tea extract and HA applied 3 times a day for 7 days. The wound size by clinical measurement (WS-CM) and photographic image (WS-PI), complete wound epithelialization (CWE), and palatal mucosa color were evaluated after 3 days and 1, 2, and 4 weeks postoperatively. The visual analog scale (VAS) for pain and analgesic consumption were used to assess participant's perception in the same postoperative periods. RESULTS: A similar progressive reduction in the wound size, associated with an improvement in the color pattern, was observed in all groups (p > 0.05). No significant differences were found for CWE and pain assessment between the examined groups (p > 0.05). CONCLUSION: The gel containing green tea extract and HA application in palatal wounds after FGG removal does not provide clinical healing benefits using this investigated protocol. CLINICAL RELEVANCE: This is the first clinical study evaluating the effect of gel containing green tea extract and HA on the palate postoperative pain control and wound healing after FGG. TRIAL REGISTRATION: http://clinicaltrials.gov : NCT05270161.

In vivo osseointegration evaluation of implants coated with nanostructured hydroxyapatite in low density bone.

OBJECTIVE: This in vivo study, aimed to biomechanically, histomorphometrically and histologically evaluate an implant surface coated with nanostructured hydroxyapatite using the wet chemical process (biomimetic deposition of calcium phosphate coating) when compared to a dual acid-etching surface. MATERIAL AND METHODS: Ten sheep (2-4 years old) received 20 implants, 10 with nanostructured hydroxyapatite coating (HAnano), and 10 with dual acid-etching surface (DAA). The surfaces were characterized with scanning electron microscopy and energy dispersive spectroscopy; insertion torque values and resonance frequency analysis were measured to evaluate the primary stability of the implants. Bone-implant contact (BIC) and bone area fraction occupancy (BAFo) were evaluated 14 and 28 days after implant installation. RESULTS: The HAnano and DAA groups showed no significant difference in insertion torque and resonance frequency analysis. The BIC and BAFo values increased significantly (p<0.05) over the experimental periods in both groups. This event was also observed in BIC value of HAnano group. The HAnano surface showed superior results compared to DAA after 28 days (BAFo, p = 0.007; BIC, p = 0.01). CONCLUSION: The results suggest that the HAnano surface favors bone formation when compared to the DAA surface after 28 days in low-density bone in sheep.

Rehabilitation of Atrophic Maxilla With Immediate Loading of Extrasinus Zygomatic Implant.

ABSTRACT: The aim of this case series was to evaluate the long-term success rate of immediate occlusal loading of extrasinus zygomatic dental implants after a 3-year follow-up. The sample consisted of 31 patients (mean age of 64 years) with atrophic maxillae rehabilitated with 1 to 4 extrasinus zygomatic implants, placed unilaterally or bilaterally. All the patients received complete implant-supported dental prostheses with immediate loading by associating zygomatic implants with conventional implants. None of the procedures were associated with bone grafts. During the 3-year period of follow-up in the present study, all the patients attended clinical sessions and underwent radiographic exams every 6 months. In total 55 zygomatic and 69 conventional implants were placed, where 1 zygomatic and 2 conventional implants were lost, representing success rates of 98.18% and 97.20%, respectively. None of the studied patients had signs of sinusitis or changes in the maxillary sinuses. All the patients showed occlusal contact on natural antagonist teeth or implant-supported dental prostheses. Therefore, it was concluded that the use of exteriorized zygomatic implants with immediate loading represented a feasible option with high success rates for the treatment of atrophic maxilla.

Osseodensification enables bone healing chambers with improved low-density bone site primary stability: an in vivo study.

Primary implant stability is a prerequisite for successful implant osseointegration. The osseodensification technique (OD) is a non-subtractive drilling technique that preserves the bone tissue, increases osteotomy wall density, and improves the primary stability. This study aimed to investigate the hypothesis that OD, through a wider osteotomy, produces healing chambers (HCs) at the implant-bone interface without impacting low-density bone primary stability. Twenty implants (3.5 × 10 mm) with a nanohydroxyapatite (nHA) surface were inserted in the ilium of ten sheep. Implant beds were prepared as follows: (i) 2.7-mm-wide using subtractive conventional drilling (SCD) technique (n = 10); (ii) 3.8-mm-wide using an OD bur system (n = 10). The sheep were randomized to two groups, with samples collected at either 14-(n = 5) or 28-days (n = 5) post-surgery and processed for histological and histomorphometric evaluation of bone-implant contact (BIC) and bone area fraction occupancy (BAFO). No significant group differences were found with respect to final insertion torque and implant stability quotient (p > 0.050). BIC values were higher for SCD after 14 and 28 days (p < 0.050); however, BAFO values were similar (p > 0.050). It was possible to conclude that the OD technique allowed a wider implant bed preparation without prejudice on primary stability and bone remodeling.

Monitoramento, manutenção e restabelecimento da saúde peri-implantar / Monitoring, maintenance and reestablishing of peri-implant health

O emprego dos implantes osteointegráveis (101) representa atualmente uma opção terapêutica viável para pacientes edêntulos parciais ou totais. Embora a ocorrência da osteointegração apresente previsibilidade comprovada por consistentes trabalhos, a instalação de doença peri-implantar inflamatória representa uma ameaça à estabilidade e à longevidade almejadas. Este trabalhose propôs a revisar na literatura aspectos importantes sobre o monitoramento e a manutenção da saúde peri-implantar, bem como apresentar condutas terapeuticas indicadas para a doença peri-implantar com base nesta revisão, foipossível observar a importância de monitoramento e manutenção e considerar a Terapia de Suporte Interceptativa e Cumulativa (TSIC) como uma forma racional e objetiva de conduzir casos de lOI, visando à manutenção da saúde.

Clinical analysis of the soft tissue integration of non-submerged (ITI) and submerged (3i) implants: a prospective-controlled cohort study.

AIM: The aim of this study was to compare the soft tissue integration of submerged and non-submerged implants by means of periodontal parameter assessments and analysis. MATERIAL AND METHODS: Thirty-one patients, who received 42 non-submerged implants (ITI) and 48 submerged implants (3i), participated in the study. There was no significant difference (P>0.05) between both groups considering gender; educational level; handedness; toothbrushing frequency; the number of auxiliary devices used; and smoking habits. The parameters assessed were gingival index (GI), plaque index (PII), retention index (RI), pocket probing depth (PPD) and keratinized mucosa index. RESULTS: At evaluation, 66.67% of all sites showed a GI of 0; 72.22% a PI of 0, and 93.33% the absence of calculus. The average PPD was 2.56 mm in the non-submerged and 2.70 mm in the submerged group. With regard to the width of keratinized mucosa, 100% of the ITI implants showed a band of keratinized gingiva around the implant, whereas 14.58% in the 3i group showed a complete absence of keratinized mucosa. The intra-examiner reproducibility was 90.96% for all parameters and the Kendall tau-b analysis showed a powerless correlation between the chosen parameters for both studied groups. CONCLUSIONS: The study material showed no major differences between submerged and non-submerged dental implants regarding GI, PII, RI and PPD, except the width of keratinized mucosa. Regarding the presence of keratinized mucosa, there is a need for further longitudinal studies to elucidate a possible benefit of one implant system over the other.

Early failure of dental implants and TNF-alpha (G-308A) gene polymorphism.

Tumor necrosis factor-alpha (TNF-alpha) is a potent inflammatory mediator with bone resorption activity. Polymorphisms in the promoter region of the human TNF-alpha gene have been shown to affect the levels of this cytokine and have been associated with a variety of diseases. The aim of this study was to investigate the possible relationship between early implant failure and a single nucleotide polymorphism (SNP) in the -308 promoter region of the TNF-alpha gene. A sample of 66 nonsmokers was divided into 2 groups: a test group comprising 28 patients (mean age, 52.7 years) with one or more early failed implants and a control group consisting of 38 individuals (mean age, 43.2 years) with one or more healthy implants. Genomic DNA from buccal mucosa was amplified by the polymerase chain reaction (PCR), analyzed by restriction fragment length polymorphism (RFLP), and submitted to polyacrylamide gel electrophoresis to distinguish allele G and allele A of the TNF-alpha (-308) gene polymorphism. Differences in the allele and genotype frequencies between control and test groups were assessed by chi-squared test (P <0.05). No significant difference was observed in the allele (P = 0.4635) and genotype (P = 0.4445) distribution of the polymorphism when control and failure groups were compared. The results indicate that the TNF-alpha (G-308A) gene polymorphism is not associated with early implant failure, suggesting that its presence alone does not constitute a genetic risk factor for implant loss in the Brazilian population.

Influência da interleucina: 1 Beta e de suas variaçöes genéticas na periodontite e periimplantite / The influence of interleukin - 1 Beta and their genetic variations on periodontitis and periimplantitis

As citocinas säo moléculas que possuem importante papel na regulaçäo da resposta inflamatória. Dentre elas, as interleucinas (IL) säo alvo de muitos estudos que tentam correlacioná-las com a doença periodontal. Este artigo tem o objetivo de realizar uma revisäo de literatura, abordando o papel da IL-1 na periodontite e na periimplantite, além de estabelecer a relaçäo de variaçöes genéticas associadas à produçäo desta citocina com a severidade da doença periodontal e com a perda de implantes osseointegráveis