3.20 COIR

Question 1

Describe hard and soft tissue changes when comparing the ridge preservation with vs. without primary closure in molar sites

Wei et al COIR

Answer 1

Periodontally hopeless molars were extracted.
Sites needed “at least 2 socket walls of ≥3 mm height, and at least 1 adjacent tooth

Control: Extraction + socket preservation with primary closure
Test: Extraction + socket preservation without primary closure

RESULTS:
NSSD in hard tissue changes
NSSD in most soft tissue changes
* However, at 6 months, the primary closure group lost more KT than the secondary intention group
* Primary closure: Lost 1 mm KT
* Secondary closure: Lost 0.4 mm KT

Question 1

What are the clinical outcomes of implant- versus abutment-level connection in screw-retained fixed dental prostheses? - 5-year RCT

Toia et al COIR

Answer 1

Compared the 5-year clinical results of “abutment level” versus “implant level” fixed prostheses

NOTE: Dr. Wang did not like the illustration or radiographs of the study, and says it was a ‘critical study design flaw’

RESULTS:
NSSD in Marginal bone loss, BOP, Plaque
SSD in PD
* Abutment level: 2.9mm ; Implant level = 3.5mm. (This is a 0.6mm difference)
SSD in KTW change
* Abutment level: 59%, Implant level 79%

Therefore: Abutment-level implants appeared to have better PD’s and less KT width change, compared to implant-level implants

Question 2

What is the clinical accuracy of partially guided implant placement in edentulous patients? - CBCT study

Baixiang Wang et al. COIR

Answer 2

Used guides and determined the accuracy of the guides via CBCT analysis

RESULTS: Average deviations were about 2 degrees
Authors conclude that guided implant surgery has “acceptible accuracy”