1. Title
2. Executive team
3. Research line
4. Summary
5. Research problem
6. Justification
7. Literature review
8. Objectives
9. Materials and methods
10. Dissemination of knowledge generated
11. Schedule of activities
12. Budget
13. References
14. Annexes

This is a clinical research study, characterized by a randomized, double-blind, placebo-controlled clinical trial. Background: Vitamin D replacement could aid in the osseointegration of dental implants. Objective: to evaluate the effect of vitamin D replacement on osseointegration of dental implants in humans. Materials and methods: Twenty individuals with hypovitaminosis D underwent dental miniimplants and randomized to two equal groups for treatment with vitamin D (5000 IU / day) or placebo for 2 months. After two months, the miniimplants will be removed and prepared for histomorphometric analysis, which will evaluate bone implant contact in percentage. Testing the hypothesis that the contact between bone and implant and the bone density in the threaded area in the test group is higher than in the control group. Test t will be used to compare the differences between the groups.

Inclusion Criteria:

• Patients of both sexes;
• No medical, temporary or intra-oral contraindications;
• Good general health;
• Need of implant in the maxilla in the posterior region (with a minimum of 5 mm of bone height visualized radiographically) or in mandible in posterior region;
• With vitamin D deficiency / deficiency (considering serum level of ≥ 15 ng / ml at ≤ 25 ng / ml).

Exclusion Criteria:

• Medical, temporary or intrabuccal contraindications;
• Smokers;
• Use of corticoid;
• Post-operative of bariatric surgery;
• Bone height less than 5mm;
• Need for maxillary sinus lift;
• Vitamin supplementation D.

The individual participants data (IPD) will be available in the dental records including complementary exams, allowing the access of other researchers during the research.

Masking for placebo or vitamin D use