Machined versus roughened immediately loaded and finally restored single implants inserted flapless: Preliminary 6-month data from a split- mouth randomised controlled trial.
OBJECTIVE
To compare the outcome of immediately loaded single implants with a machined or a roughened surface.


METHODS
Fifty patients had two implant sites randomly allocated to receive flaplessplaced single Syra implants (Sweden & Martina), one with a machined and one with a roughened surface (sand-blasted with zirconia powder and acid etched), according to a split-mouth design. To be loaded immediately, implants had to be inserted with a torque superior to 50 Ncm. Implants were restored with definitive crowns in direct occlusal contact within 48 h. Patients were followed for 6 months after loading. Outcome measures were prosthetic and implant failures and complications.


RESULTS
Two machined implants and four roughened implants were not loaded immediately. Six months after loading no dropout occurred. One implant loaded late, which had a rough implant surface, failed 20 days after loading (P (McNemar test) = 0.625; difference in proportions = -0.04; 95% CI: -0.15 to 0.07). Three crowns had to be remade on machined implants and four on roughened implants (P (McNemar test) = 1.000; difference in proportions = -0.02; 95% CI: -0.12 to 0.08). Three machined and five roughened implants experienced complications (P (McNemar test) = 0.625; difference in proportions = -0.04; 95% CI: -0.15 to 0.07). There were no statistically significant differences between groups for crown and implant losses as well as complications.


CONCLUSIONS
Up to 6 months after loading both machined and roughened flapless-placed and immediately loaded single implants provided good and similar results, however, longer follow-ups are needed to evaluate the long-term prognosis of implants with different surfaces.
Gioacchino
G
Cannizzaro
Pietro
P
Felice
Ignazio
I
Loi
Paolo
P
Viola
Vittorio
V
Ferri
Michele
M
Leone
Matteo
M
Lazzarini
Anna
A
Trullenque-Eriksson
Marco
M
Esposito
D000134:Acid Etching, Dental / Q000379:methods; D000328:Adult; D003442:Crowns; D045662:Dental Etching / Q000379:methods; D059605:Dental Implant-Abutment Design; D019250:Dental Implants, Single-Tooth; D003764:Dental Materials / Q000737:chemistry; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D057893:Immediate Dental Implant Loading / Q000379:methods*; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications; D013499:Surface Properties; D016896:Treatment Outcome; D055815:Young Adult; D015040:Zirconium / Q000737:chemistry
D003764:Dental Materials; D015040:Zirconium; C028541:zirconium oxide