Manutenção da crista óssea alveolar a longo prazo em implantes cone-morse e hexagonal externo
: revisão sistemática

  • Samuele Fuda (Student)

Student thesis: Master's Thesis


Introduction: Peri-implant bone maintenance represents an interesting topic of debate as it is closely linked to the prognosis of implant-supported prosthetic rehabilitations. The implant structure as well as the type of implant-abutment connection are factors that can contribute to peri-implant bone loss and negatively affect treatment prognosis. The two most used implant-abutment designs today are the external hexagon connection and the morse-taper connection. Objective: Evaluate the level of scientific evidence on alveolar crestal bone maintenance and associated clinical parameters after placement of morse taper and external hexagon implants, to achieve clinical predictability on the topic addressed. Materials and methods: The literature considered for this systematic review is based on PRISMA guidelines and aims to answer the following specific question constructed in PICO (Population, Intervention, Control, Outcomes) format: "For patients treated with dental implants (P), either external connection (I) or morse taper (C), are there differences in bone crest maintenance after at least six months in function (O)? An electronic search in MEDLINE®/Pubmed, Embase and Wiley databases was performed to identify clinical studies comparing bone loss around external hexagon and morse taper implants with a minimum follow-up period of six months. The data obtained from the included studies were extracted and analyzed using a continuous random effects model meta-analysis. The variable used was marginal bone loss. Results: The initial search identified 110 articles. However, 6 articles were considered adequate after reading the full text and were included in the study. The literature reviewed revealed a difference in peri-implant bone loss in the two types of connections analyzed (p< .001). The secondary clinical parameters and implant survival associated with the two connection types revealed no significant differences. Conclusion: The results of the present systematic review suggest that bone maintenance is higher for implants with a cone-morse connection. However, due to the limited number of clinical studies included in this review, it is suggested to take care with the interpretation of the results. Further investigations are therefore needed, including a larger number of patients, a longer follow-up time and adequate control for confounding factors.
Date of Award19 Jul 2022
Original languagePortuguese
Awarding Institution
  • Universidade Católica Portuguesa
SupervisorAnna Moura (Supervisor) & Gustavo Fernandes (Co-Supervisor)


  • Dental implants
  • Marginal bone loss
  • Morse
  • External hexagon


  • Mestrado em Medicina Dentária

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