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

Study Overview
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Brief Summary
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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.

Detailed Description
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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.

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

Conditions
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Partial Edentulism, Tooth Loss

Intervention / Treatment
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* Other: Short implants Treatment
* Other: Regular implants Treatment


Participation Criteria
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Eligibility Criteria
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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: -

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Short implants Treatment<br>Group 2 (G2; n=15 patients) had short implants (OsseoSpeed ™ L6mm Ø4 mm) [DENTSPLY Implants, Waltham, MA, USA] placed without sinus lift and augmentation procedure. | Other: Short implants Treatment<br>* Short implants are placed in the alveolar bone and a clinical Ostell and Periotest evaluation of the implants after a period of time is done. Analysis of periapical radiographs and CBCT images after a period of time. Bone around the implant was measured, marginal bone level loss is determined.<br>|
| Active Comparator: Regular Implants Treatment<br>Group 1 (G1; n=15 patients) had conventional dental implants (OsseoSpeed ™ L11 Ø4 mm and L13 Ø4 mm) [DENTSPLY Implants, Waltham, MA, USA] placed, preceded by the sinus lift procedure from a lateral window approach with the application of the xenogeneic bone graft Geistlich Bio-Oss® [Geistlich AG, Wolhusen, Switzerland]. The lateral window approach sinus lift surgery was performed 6 weeks prior to the implant placement by the same surgeon. | Other: Regular implants Treatment<br>* Sinus lift procedure is done and regular implants are placed in the alveolar bone and a clinical Ostell and Periotest evaluation of the implants after a period of time is done. Analysis of periapical radiographs and CBCT images after a period of time. Bone around the implant was measured, marginal bone level loss is determined.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Clinical measurement of implant stability | Evaluation of implant secondary stability in both groups. Stability measured and evaluated with Periotest(R) device - after 36 months. | 36 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Radiological measurement of marginal bone loss around implant | Evalation if there is difference in marginal bone level around the implants in both groups. Periapical radiographs and CBCT images taken and the begining and at the end of the observation period will be compared and bone level will be measured. Loss of marginal bone will be calculated. | 36 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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implant, dental implant