The Influence of the Crown-implant Ratio on the Crestal Bone Level and Implant Secondary Stability

The Influence of the Crown-implant Ratio on the Crestal Bone Level and Implant Secondary Stability - 36 Months Clinical Study

The aim of the study was to determine whether implant length and the crown-to-implant (C/I) ratio influence implant stability and the loss of the surrounding marginal bone, and whether short implants can be used instead of sinus augmentation procedures.

The patients participating in the study (n=30) had one single tooth implant - a short (OsseoSpeed™ L6Ø4 mm, Implants) or a regular implant (OsseoSpeed™ L11 and L13Ø4 mm, DENTSPLY Implants) - placed in the maxilla. The evaluation was based on clinical and radiological examination.

The crown-to-implant ratio was determined by dividing the length of the crown together with the abutment by the length of the implant placed crestally. Mean crown-to-implant ratios were calculated separately for each group and its correlation with the MBL (marginal bone loss) and stability was assessed. The authors compared the correlation between the C/I ratio values, MBL and secondary implant stability.

Inclusion Criteria:

• Non-smoking patients with no systemic or local diseases were qualified.

Additional inclusion criteria were as follows:

• minimal apicocoronal height of the alveolar ridge of 6 mm in the region of the implant insertion in the pre-surgical qualification
• minimal width of the alveolar ridge of 6-7 mm in the region of interest
• HKT (height of the keratinized tissue) higher than 2 mm
• API ≤ 35 (Approximal Plaque Index)
• PI ≤ 25. (Plaque Index)
• Bone Type III or D2 were included in the study
• No graft procedures in the area of interest,

Exclusion Criteria:

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