A 5-year prospective clinical study of submerged and nonsubmerged Paragon system implants in the edentulous mandible.
OBJECTIVE
The aim of this investigation was to evaluate the clinical outcome of two different surgical protocols in the edentulous mandible: submerged and nonsubmerged. Further, the Paragon dental implant with a titanium plasma-sprayed surface was evaluated.


METHODS
Twenty-nine consecutively treated patients with 168 implants supporting fixed prostheses were included. All but 3 patients were provided 6 implants, placed via nonsubmerged healing on one side and submerged healing on the other. Data were collected from patient records and radiographs. Twenty-four patients participated in the 5-year clinical follow-up examination.


RESULTS
After 5 years, all patients still had their mandibular fixed prostheses in function. Cumulative survival rates were 100% for prostheses and 99.4% for implants. However, 3 implants fractured in 1 patient. One submerged implant was lost before loading but no further implants were lost during follow-up. The radiographic bone loss was small for all implants with a mean of 0.14 mm (standard deviation [SD]: 0.37) at 1 year and 0.42 mm (SD: 0.48) at 5 years for nonsubmerged implants and 0.17 mm (SD: 0.32) at 1 year and 0.51 mm (SD: 0.33) at 5 years for submerged implants. Nineteen implants (including the 3 that fractured) presented annual bone loss exceeding 0.2 mm after the first year, yielding a cumulative success rate of 86.2% after 5 years.


CONCLUSIONS
Single-stage surgery was shown to have the same predictability as two-stage surgery in the anterior edentulous mandible. Paragon implants with a titanium plasma-sprayed surface showed a fracture rate of 2.2% and a success rate of 86.2% after 5 years.
Eliasson
Alf
A
Department of Prosthetic Dentistry, Postgraduate Dental Education Center, Orebro, Sweden. alf.eliasson@orebroll.se
Narby
Birger
B
Ekstrand
Karl
K
Hirsch
Jan
J
Johansson
Anders
A
Wennerberg
Ann
A
D000368:Aged; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging / Q000209:etiology; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D000044:Dental Abutments; D003758:Dental Implantation, Endosseous / Q000009:adverse effects / Q000379:methods*; D015921:Dental Implants; 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; D007575:Jaw, Edentulous / Q000534:rehabilitation / Q000601:surgery*; D008297:Male; D008334:Mandible / Q000601:surgery*; D016348:Osseointegration / Q000502:physiology; D010518:Periodontitis / Q000209:etiology; D011446:Prospective Studies; D011859:Radiography; D016019:Survival Analysis; D014025:Titanium / Q000737:chemistry; D016896:Treatment Outcome
D020099:Coated Materials, Biocompatible; D015921:Dental Implants; D003764:Dental Materials; D014025:Titanium