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15 January 2020

Long-term behavior of PICN inlay and overlay CAD/CAM

Simona Chirico

Inlay and overlay are a good and right choice in case of large carious and restorative defects. The introduction of CAD/CAM system gives the possibilities to provide patients aesthetic, function and long-lasting reliable restorations in one single appointment.
Today we have several studies that give us results on the long term success of lithium disilicate and feldspathic ceramic. But in this last years another CAD/CAM material is used for partial indirect restorations: PICN (polymer infiltrated ceramic network).

How does it work?
The study conducted by Spitznagel et al. tried to answer to this question. They evaluated the long-term behavior of this material in their prospective 5-year study.  

Posterior teeth of 47 patients were restored with 103 restorations (45 inlays, 58 PCRs). After defect- oriented preparations, monolithic PICN restorations of VITA Enamic were fabricated with a CAD/CAM system (inEoS blue/ CEREC inLab MCXL) and adhesively bonded (Variolink II). Clinical reevaluations were so far performed at baseline and 6, 12, 24, and 36 months after insertion according to modified United States Public Health Service (USPHS) criteria. Absolute failures were demonstrated by Kaplan-Meier survival rate and relative failures by Kaplan-Meier success rate. A logistic regression model was adjusted for modified USPHS criteria to investigate time and restoration effects (p < 0.05).

After an observation time of 3 years, survival rates were 97.4% for inlays and 95.6% for PCRs. Three restorations had to be replaced due to clinically unacceptable fractures. Secondary caries and debonding were not observed. The 3-year Kaplan- Meier success rate was 84.8% for inlays and 82.4% for PCRs. The decrease in marginal adaption (p = 0.0005), increase in marginal discoloration (p < 0.0001), and surface roughness (p = 0.0005) over time were significant. Color match and anatomic form were excellent. No significant differences were found between both types of restorations for survival (p = 0.716) and success rate (p = 0.431).

PICN restorations are suitable treatment option for posterior inlays and overlay. They showed a favorable clinical performance, but clinical long-term data have to be waited.

(Photocredit: Dr. Simona Chirico)

For additional informations: Polymer-infiltrated ceramic CAD/CAM inlays and partial coverage restorations: 3-year results of a prospective clinical study over 5 years

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