This project examined the effect of splinting adjacent dental implants of different designs [Sintered porous surface (SPS), Threaded dual acid etched (THR-DAE), Threaded sand-blasted large grit acid etched (THR-SLA)] placed in posterior sites and compared two intraoral radiographic techniques to assess peri-implant crestal bone levels. 799 implants located in 345 patients qualified and were examined retrospectively using an inclusion criteria of a minimum one year in function and having a recent periapical (PA) and vertical bitewing radiograph (vBW). SPS had less bone loss than THR-DAA and THR-SLA. PA views showed approximately 0.10 mm (Range 0.07-0.40 mm) less crestal bone loss than vBW (P<0.01). Splinted implants had more crestal bone loss (0.30 mm; range 0.16-0.38 mm) than non-splinted implants. 49 implants failed with an overall failure rate of 4.9% with a significant difference in the failure rate of SPS and THR-DAA (P<0.0005) and in the time to fail (P<0.0036).

This project examined the effect of splinting adjacent dental implants of different designs [Sintered porous surface (SPS), Threaded dual acid etched (THR-DAE), Threaded sand-blasted large grit acid etched (THR-SLA)] placed in posterior sites and compared two intraoral radiographic techniques to assess peri-implant crestal bone levels. 799 implants located in 345 patients qualified and were examined retrospectively using an inclusion criteria of a minimum one year in function and having a recent periapical (PA) and vertical bitewing radiograph (vBW). SPS had less bone loss than THR-DAA and THR-SLA. PA views showed approximately 0.10 mm (Range 0.07-0.40 mm) less crestal bone loss than vBW (P<0.01). Splinted implants had more crestal bone loss (0.30 mm; range 0.16-0.38 mm) than non-splinted implants. 49 implants failed with an overall failure rate of 4.9% with a significant difference in the failure rate of SPS and THR-DAA (P<0.0005) and in the time to fail (P<0.0036).

Purpose: To assess the role of photobiomodulation on bone healing around dental implants. Materials and Methods: 72 patients requiring 76 dental implants were included. All patients received dental implant(s.) Treatment group had also to apply LED to surgical sites. ISQ of implants was measured following implant placement and at 1, 2, 4, and 8 weeks postoperatively. Radiographs were taken after insertion and at 8 weeks postoperatively. Data were analyzed using SPSS and Stata. Results: Treatment group showed an increase in ISQ values over the follow-up period compared to control (p < 0.001). Primary effect of LED on ISQ values was seen over the first 2 weeks (p < 0.05). Treatment group showed less decrease in crestal bone height at 8 weeks (p = 0.05). Conclusions: Data suggest that photobiomodulation will allow for a continuous increase in ISQ value and may reduce crestal bone resorption following implant placement.

Purpose: To assess the role of photobiomodulation on bone healing around dental implants. Materials and Methods: 72 patients requiring 76 dental implants were included. All patients received dental implant(s.) Treatment group had also to apply LED to surgical sites. ISQ of implants was measured following implant placement and at 1, 2, 4, and 8 weeks postoperatively. Radiographs were taken after insertion and at 8 weeks postoperatively. Data were analyzed using SPSS and Stata. Results: Treatment group showed an increase in ISQ values over the follow-up period compared to control (p < 0.001). Primary effect of LED on ISQ values was seen over the first 2 weeks (p < 0.05). Treatment group showed less decrease in crestal bone height at 8 weeks (p = 0.05). Conclusions: Data suggest that photobiomodulation will allow for a continuous increase in ISQ value and may reduce crestal bone resorption following implant placement.

Este estudo teve como objetivo analisar e comparar o comportamento biomecânico de um implante de comprimento curto com um implante de comprimento padrão, no que diz respeito às tensões ósseas ao redor do implante. Foi considerado como variável o aumento da espessura óssea cortical, em dois tipos: fino e espesso. Os modelos de elementos finitos em três dimensões (3D) foram criados a partir de uma secção de mandíbula de 20 mm, referente ao segundo pré-molar, com um implante endósseo único inserido dentro do osso esponjoso com cortical fina de 0,5 mm e cortical espessa de 2,0 mm. Uma carga oclusal vertical de 100 N e uma carga oblíqua de 40 N foram aplicadas. Os ossos cortical e esponjoso foram considerados isotrópicos e linearmente elásticos e o critério de avaliação foi o de tensões de von Mises. O implante curto utilizado foi de 4,1 mm de diâmetro por 6,0 mm de comprimento, e o implante padrão de 4,1 mm de diâmetro por 10,0 mm de comprimento (ambos da marca Straumann®). A prótese sobre o implante foi composta por um pilar sólido de 5,5 mm de altura e por uma coroa de segundo pré-molar. Conforme as simulações pelo MEF, pôde-se concluir que: 1) O aumento da espessura óssea favoreceu uma melhor distribuição das tensões, registrando valores mais baixos na região cervical cortical. 2) O modelo de implante curto na situação de cortical espessa apresentou melhores resultados biomecânicos comparado com o modelo de implante padrão na situação de cortical fina. / The aim of this monograph was to analyze and compare the biomechanical behavior of a short length implant against a standard length implant, regarding stress distribution on the bone around the implant. Bone cortical thickness of the ridge was considered as thin and thick. The 3D finite element models were created of a 20-mm second premolar section of the mandible with a single endosseous implant embedded in cancellous bone with thin cortical of 0.5 mm and with thick cortical of 2.0 mm. A vertical occlusal load of 100 N and an oblique load of 40 N were applied. The cortical and cancellous bone were considered to be isotropic and linearly elastic Von Mises stress criterion was used for analysis. The short implant used was of 4.1 mm of diameter and 6 mm in length, and the standard implant was of 4.1 mm of diameter and 10 mm in length (both Straumann ®). The prosthesis on the implant consisted of a solid abutment of 5.5 mm in height and a crown of second premolar. Conclusions: 1) Increasing bone thickness favored a better stress distribution, showing lower values in the cervical cortical bone. 2) Short implants with thin cortical situations showed better biomechanical results compared to standard implants with thick cortical situations.

No description available.

Este estudo teve como objetivo analisar e comparar o comportamento biomecânico de um implante de comprimento curto com um implante de comprimento padrão, no que diz respeito às tensões ósseas ao redor do implante. Foi considerado como variável o aumento da espessura óssea cortical, em dois tipos: fino e espesso. Os modelos de elementos finitos em três dimensões (3D) foram criados a partir de uma secção de mandíbula de 20 mm, referente ao segundo pré-molar, com um implante endósseo único inserido dentro do osso esponjoso com cortical fina de 0,5 mm e cortical espessa de 2,0 mm. Uma carga oclusal vertical de 100 N e uma carga oblíqua de 40 N foram aplicadas. Os ossos cortical e esponjoso foram considerados isotrópicos e linearmente elásticos e o critério de avaliação foi o de tensões de von Mises. O implante curto utilizado foi de 4,1 mm de diâmetro por 6,0 mm de comprimento, e o implante padrão de 4,1 mm de diâmetro por 10,0 mm de comprimento (ambos da marca Straumann®). A prótese sobre o implante foi composta por um pilar sólido de 5,5 mm de altura e por uma coroa de segundo pré-molar. Conforme as simulações pelo MEF, pôde-se concluir que: 1) O aumento da espessura óssea favoreceu uma melhor distribuição das tensões, registrando valores mais baixos na região cervical cortical. 2) O modelo de implante curto na situação de cortical espessa apresentou melhores resultados biomecânicos comparado com o modelo de implante padrão na situação de cortical fina. / The aim of this monograph was to analyze and compare the biomechanical behavior of a short length implant against a standard length implant, regarding stress distribution on the bone around the implant. Bone cortical thickness of the ridge was considered as thin and thick. The 3D finite element models were created of a 20-mm second premolar section of the mandible with a single endosseous implant embedded in cancellous bone with thin cortical of 0.5 mm and with thick cortical of 2.0 mm. A vertical occlusal load of 100 N and an oblique load of 40 N were applied. The cortical and cancellous bone were considered to be isotropic and linearly elastic Von Mises stress criterion was used for analysis. The short implant used was of 4.1 mm of diameter and 6 mm in length, and the standard implant was of 4.1 mm of diameter and 10 mm in length (both Straumann ®). The prosthesis on the implant consisted of a solid abutment of 5.5 mm in height and a crown of second premolar. Conclusions: 1) Increasing bone thickness favored a better stress distribution, showing lower values in the cervical cortical bone. 2) Short implants with thin cortical situations showed better biomechanical results compared to standard implants with thick cortical situations.

Introduction : Afin de minimiser la morbidité postopératoire et les échecs du traitement dentaire, plusieurs schémas thérapeutiques antibiotiques ont été proposés. Cependant, l’utilisation intensive des antibiotiques dans les soins de santé a été débattue en raison des effets indésirables et la résistance bactérienne. De plus, l’impact des antibiotiques préopératoires sur le niveau osseux péri-implantaire n’est toujours pas clairement établi. Objectifs : L’objectif primaire de cette étude était d’évaluer si l’administration d’un antibiotique préopératoire (azithromycine 500 mg) avant la pose d’implant avait un impact sur les niveaux d’os crestal péri-implantaire après quatre mois chez les patients en bonne santé subissant une pose d’implant simple de type « platform-switching ». Les objectifs secondaires étaient d’évaluer la sévérité de la douleur postopératoire, la morbidité postopératoire associée à la chirurgie implantaire et le taux de survie des implants à quatre mois. Méthodes : Dix-neuf participants ont été recrutés dans un essai clinique randomisé à double insu en groupes parallèles. Les participants du groupe d’intervention ont reçu 500 mg d’azithromycine une heure avant la pose d’implant. Les participants du groupe contrôle ont reçu un placebo identique une heure avant la chirurgie implantaire. Les changements du niveau de l’os crestal péri-implantaire (résultat primaire) ont été mesurés quatre mois plus tard à l’aide de radiographies standardisées. La sévérité de la douleur et la morbidité postopératoire associées à la chirurgie (résultats secondaires) ont été évaluées par des examens cliniques et des questionnaires autoadministrés à une semaine et quatre mois postopératoires. Le taux de survie des implants et la santé péri-implantaire ont été évalués quatre mois après la pose d’implant, avant la mise en charge prothétique. Des analyses descriptives et bivariées ont été utilisées pour analyser les données. Une valeur de P ≤ 0,05 était considérée statistiquement significative. Résultats : Dix-huit participants ont complété l’étude (âge moyen : 52,8 ± 13,9ans). Les changements moyens du niveau osseux péri-implantaire pour le groupe intervention et le groupe contrôle étaient respectivement de -0,79 ± 0,57mm et de -0,35 ± 0,37mm. Il n’y avait pas de différences statistiquement significatives entre les deux groupes en ce qui concerne le remodelage osseux moyen péri-implantaire (-0,44mm (IC 95% : -0,94, +0,55)) et la sévérité de la douleur (P>0,05). Les interférences avec les activités quotidiennes, plus précisément, l’interférence de la chirurgie à ouvrir grand la bouche étaient significativement plus importante chez le groupe antibiotique comparativement au groupe intervention au cinquième jour postopératoire (P<0,05). Le taux de survie des implants était de 100% dans les deux groupes et la santé des tissus péri-implantaires était similaire entre les deux groupes quatre mois après la chirurgie. Conclusion : Les résultats préliminaires de cette étude clinique suggèrent qu’une dose préopératoire d’antibiotique chez les patients en bonne santé ayant une pose d’implant simple de type « platform-switching » n’apporte pas de bénéfice clinique. Des investigations additionnelles de plus grande envergure sont nécessaires afin de confirmer les résultats de cette étude. / Introduction: In order to minimise postoperative morbidity and failures of dental implant therapy, several antibiotic regimens have been proposed. However, the extensive use of antibiotics in health care has been debated due to the adverse effects and bacterial resistance. Furthermore, the impact of preoperative antibiotics on peri-implant bone level remains unclear. Objectives: The primary objective of this study was to assess whether giving a preoperative antibiotic (azithromycin 500mg) before implant placement would influence peri-implant crestal bone levels after four months in healthy patients undergoing straightforward platform-switched implant placement. The secondary objectives were to evaluate postoperative pain severity, surgery-associated morbidities, and four-month implant survival rate. Methods: Nineteen individuals were recruited in a double-masked two-arm randomised clinical trial. Participants in the intervention group received 500mg of azithromycin one hour before implant placement. Participants in the control group took one identical placebo one hour preoperatively. The changes in mesial and distal crestal bone level (primary outcome) were measured at baseline and four-month follow-up using standardised periapical radiographs. Pain severity and surgery-associated morbidities (secondary outcomes) were evaluated by clinical examinations and self-administered questionnaires at one-week and four-month follow-ups. Implant survival rate was assessed at the four-month follow-up. Descriptive and bivariate analyses were used to analyse the data. A P value ≤ 0.05 was considered statistically significant. Results: Eighteen participants completed the study (mean age: 52,8 ±13,9 years). The mean changes in peri-implant bone level for the intervention group and the control group were 0,79 ±0,57 mm and -0,35 ±0,37mm, respectively. There were no statistically significant differences between the two groups in mean change in peri-implant bone level (-0,44mm (95% CI: -0,94, +0,55)) and pain severity (P>0.05). Interferences with daily activities, more specifically the interference of surgery with opening the mouth larger was significantly higher in the antibiotic group compared to the control group (P<0.05) on the fifth postoperative day. The implant survival rate was 100% in both groups and peri-implant tissue health was similar between groups four months after surgery. Conclusion: The preliminary results of this clinical study demonstrates that giving one preoperative dose of antibiotic in healthy patients undergoing straightforward “platform-switching” implant placement does not provide any clinical benefit. Further larger controlled studies are needed to confirm the results of this study.