Some studies show that different types of threads in tapered implants result in differences in primary stability. The aim of this study is to a perform a prospective, controlled, randomized clinical trial comparing primary and secondary stability between long and standard thread implants in the treatment of partial edentulous patients.

The study sample consists of 23 maxillary partial edentulous patients, where 32 implants were placed, with threads of 0.7 mm or 0.3 mm in the location of premolars and molars. The comparison, in terms of primary stability, is made by measuring the ISQ value (implant stability quotient), in four locations (buccal, palatal, mesial and distal). Statistical analysis was performed using the independent T-Test.

Inclusion Criteria:

• Minimum 18 years;
• No systemic conditions that contraindicate surgery;
• Periodontal health or periodontal disease treated as part of a periodontal support program and having a high level of plaque control;
• Partial edentulous patients, in the upper jaw, specifically in the location of premolars and molars;

Exclusion Criteria:

• Patients with insufficient quantity of bone for implant placement without bone regeneration procedures;
• Patients who underwent medication that could affect stability and osteointegration up to 3 months prior to study initiation;
• Patients with untreated periodontal pathology or who have not followed periodontal supportive treatment;
• Smokers, Pregnant or lactating women.