Radiographic evaluation of bone level changes around injection molded twopiece zirconia implants: 12-month results of a prospective study
Aluno: Paola Rebelatto Alcântara
Orientador(a): Prof. Dr. Rubens Moreno de Freitas
Área: Implantodontia
Ano: 2023
ABSTRACT
Purpose: The aim of this study was to report the 12-month results of a prospective study
regarding marginal bone level changes and survival rate around tapered injection-molded twopiece zirconia implants.
Methods: Patients who referred to Ilapeo College (Curitiba, Brazil) between October and
November 2020 presenting at least one healed single-tooth site, with natural adjacent and
antagonist teeth and sufficient bone width to allow insertion of a 4.3-diameter implant were
selected. All patients received at least one injection molded two-piece zirconia implant.
Immediate provisionalization was applied when primary stability of 32 N.cm was achieved,
and provisional acrylic prostheses were inserted. These were replaced after three months for
final monolithic zirconia crowns. Patients were followed and periapical radiographs were
obtained at all visits, up to 12 months after provisionalization.
Results: Thirty patients with a mean age of 46.1±9.5 years were included in the study for the
rehabilitation of one or more edentulous areas, resulting in a sample of 38 implants. The
majority of the implants were submitted to immediate provisionalization (n=31 / 81.6%).
Survival and success rates of 89.5% (34/38) and 84.4% (33/38), respectively, were observed in
a follow-up period of 12 months. Considering the surviving implants, the prosthesis survival
rate was 97.1%. Regarding marginal bone loss, it was noticed that greater bone loss happened
during the first 6 months (mean 0.24±0.20mm), whereas mean marginal bone loss was
0.30±0.22mm one year after provisionalization.
Conclusion: The present study suggests that two-piece zirconia implants produced by injection
molding, provide a successful treatment for the rehabilitation with single-unit prosthesis,
presenting good survival and success rates and excellent bone level maintenance up to 1 year
after provisionalization.