Please select the eligibility criteria that correspond to the clinical trial below.
Title: Histological Comparison of Healing Following Tooth Extraction With Ridge Preservation Using Cortical Versus Cancellous Freeze Dried Bone Allograft
Brief Summary: The purpose of this study is to compare cortical and cancellous freeze-dried bone allograft (FDBA) materials in the preservation of alveolar bone following extraction of non-molar teeth. The primary objective is to histologically evaluate and compare the healing of extraction sockets of non-molar teeth grafted with cortical FDBA versus cancellous FDBA for ridge preservation.


Options:
A: Inclusion Criteria:

* Adult patients (\> 18 years old) requiring extraction (for caries, fracture, periodontitis, prosthetic reasons) and subsequent moderately rough implant-supported single crown of one upper or lower asymptomatic front tooth or premolar
* Systemically healthy patients not smoking more than 10 cigarettes/day.
* Oral healty patients with adequate oral hygiene (bleeding on probing \< 30%; Plaque index\< 30%).

Exclusion Criteria:

* Patients smoking more than 10 cigarettes per day.
* Patients with oral mucosa diseases
* Patients with insulin-dependent diabetes.
* Patients with a history of malignancy, radiotherapy, or chemotherapy for malignancy.
* Patient pregnant or intended to be pregnant or nursing
* Patients taking medications or having treatments with an effect on mucosal healing in general (e.g. steroids, large doses of antiinflammatory drugs).
* Patients with a disease affecting connective tissue metabolism.
* Patients allergic to collagen.
B: Inclusion Criteria:

* (1) Health patients, American Society of Anesthesiologists (ASA) I or II
* (2) Patients who need to submit tooth extraction (pre-molar, canine and incisor teeth - uniradicular teeth or teeth with fused roots) which present ideal conditions to receive dental implants after 3 months.

Exclusion Criteria:

* Smoking
* Systemic diseases related with healing disorders
* Poor oral hygiene
* Pregnant or lactating patient
* Use of flap elevation for dental extraction
C: Inclusion Criteria: Patients will be included in this study if they qualify the following inclusion criteria:

* Live within 50 miles from the School of Dentistry, University of Texas Health Science Center at San Antonio
* Are able to attend a minimum of 6 visits over a 4-5 month period, as required by the study protocol
* A single rooted tooth that has been identified as requiring extraction
* Desire a dental implant to replace the missing tooth
* Have adequate restorative space for a dental implant-retained restoration
* Have at least 10mm of alveolar bone height, without impinging on the maxillary sinus or inferior alveolar canal.
* Have a dehiscence of the buccal or lingual bony plate of the tooth socket extending no more than 50% of the total depth of the socket.
* Female patients who have undergone a hysterectomy, tubal ligation, or menopause, and non-pregnant women of child-bearing potential.
* Are nonsmokers or former smokers. Current smokers may only be included if they smoke \<10 cigarettes per day

Exclusion Criteria:

* Patients who live more than 50 miles from the School of Dentistry, University of Texas Health Science Center at San Antonio
* Patients who do not meet all the inclusion criteria or who will not cooperate with the required follow-up schedule.
* Patients will are mentally incompetent, prisoners, or pregnant.
* Pregnant women or women intending to become pregnant during the study period.
* Smokers who smoke \>10 cigarettes per day
* Clinical and/or radiographic determinations which will preclude inclusion in this study are: Active infection other than periodontitis; Inadequate bone dimensions or restorative space for a dental implant; Presence of a disease entity, condition or therapeutic regimen which decreases probability of soft tissue and bony healing, e.g., poorly controlled diabetes, chemotherapeutic and immunosuppressive agents, autoimmune diseases, history of bisphosphonate use or long-term steroid therapy; Positive medical history of endocarditis following oral or dental surgery.
* Sensitivity or allergy to Bacitracin, Gentamicin, Polymyxin B Sulfate, alcohol and/or surfactants
D: Inclusion Criteria:

* single rooted tooth requiring extraction with future dental implant placement

Exclusion Criteria:

* smoking \> 10 cigarettes per day poorly controlled diabetes

Answer: D