BACKGROUND This study evaluated the effect of different polymerization modes and duration on the degree of conversion (DC) of resin cement under different types of ceramics. METHODS Ceramic materials were divided into 3 groups (n=60): Group 1; CERASMART, Group 2; Vita Enamic and Group 3; Vita MARK II. Each group was then divided into three subgroups (n=20) according to the polymerization mode (A; low-intensity, B; high-intensity, and C; soft-start). Subgroups were then divided into two further groups according to the polymerization time (I; 10 s and II; 20 s). DC of light-cured resin cement beneath different kinds of ceramics was tested using FTIR spectroscopy. Results were compared to a control group cured without overlying ceramic. RESULTS While the type of ceramic and mode of polymerization showed a significant effect on the DC of resin cement, polymerization duration did not. Vita Mark II group showed significantly the highest DC of resin cement, followed by Vita Enamic and Cerasmart. High and low intensity polymerization modes did not show significant difference but both showed significantly lower DC when compared to soft start mode. CONCLUSIONS Type of ceramic and polymerization mode showed a direct effect on the DC of resin cement.

Objective Odontogenic keratocyst (OKC) can be classified as an oral lesion representing the third most common cyst of the jaws characterized by a high rate of recurrence. OKC was accepted as a neoplastic lesion in the 2005 WHO classification and it was called keratocystic odontogenic tumor (KCOT). However, in the 2017 classification of odontogenic tumors, OKC was moved back into the cyst category. This study aims to evaluate clinically, radiographically and through the histological examination the healing of a patient with OKC who underwent surgery with a marsupialization approach. Design An 83-year-old female patient, presented deformation of the right hemi-mandibular region and paresthesia of the right hemi-labium, during intraoral examination it was possible to detect an eggshell crackle on palpation of the anterior edentulous mandible, moreover, the patient reported a growth of the lesion over time that prevented her from using the removable prosthesis. Methods At the OPT it was possible to appreciate a unilocular area that extended from the parasymphyseal region to the right hemi-mandible. The CT scan showed massive erosion that only partially spared the lower cortex and involvement of the mental foramen. Results Checks following surgery show healing also confirmed by instrumental check-ups. Conclusions Surely this study offers a valid alternative to more invasive and debilitating surgical treatments.

The patients' request for treatment with clear aligners is constantly increasing. The aligners permit to the clinicians a valid way to solve a lot of orthodontic cases but the patients' compliance and the clinicians' capabilities and knowledge of the technique is fundamental for the outcome. Seventy-two digital models of 18 consecutive patients treated with Invisalign and Smart Track aligners for 14 weeks were analyzed. The operator positioned 24 points on each model and were obtained the values of arch depth and perimeter of arch before and after the treatment. The variations of measurement were calculated with t student test. A decrease of arch depth and perimeter was found from t0 to t1 and the most relevant difference was observed in the upper arch depth with a decrease of 1.3 mm and in the upper arch perimeter with a difference of 1.1 mm. There was always a decrease of the values of arch depth and arch perimeter at the end of the treatment, especially in the upper arch. These changes must be considered by the clinicians to perform a better treatment to obtain the most predictable results and a patient's higher satisfaction.

One to 6 months after implant placement is a critical time/period responsible for crestal bone loss that may affect implant osseointegration. The study aims to explore the effectiveness of provisional adhesive Maryland-bridge (AMB) applied to prevent marginal bone level (MBL) around implants placed in edentulous crestal bone in posterior area during osseointegration period. Healthy, non-smoker patients (N.=18) were included in the study. Titanium implants were placed nonsubmerged (i.e. tissue-level) with cover screws at gingival level in edentulous crestal bone with flapless technique. Nine patients randomly received an AMB, while 9 patients did not receive any AMB. Each AMB remained in place for 3 months and removed before impression. After 3 months abutments were applied, and provisional resin crowns cemented and definitive metal-ceramic crowns were cemented after 2-3 months. Periapical Rx were taken using paralleling technique before and after implant insertion, at 1, 3 months (pre-loading time) and after 6 months (post-loading time). MBL was evaluated in double-blind on scanned periapical radiographs and assessed at mesial and distal side of implants (M-MBL and D-MBL). Area of bone loss on mesial and distal side of implants (Area-M and Area-D) and Cervical Enamel Junction migration of mesial and distal adjacent teeth were also measured (CEJ-M and CEJ-D). Linear regression models were fitted to evaluate the existence of any significant difference. Two drop-out was observed in AMB group. A total of 16 patients completed the study. After 6 months, all implants were safe and free from complications. AMB group showed the most stable MBL at 1-6 months, statistically different from non-AMB and resulted in a reduced crestal bone loss from baseline compared to Non AMB group. Area-M and Area-D were not statistically different between the groups. CEJ-M and CEJ-D were stable in both groups. The use of Adhesive Maryland Bridge to protect non-submerged post-extractive implants is a safe procedure that prevents bone loss around implants and preserve the 3D architecture of crestal bone ridge.

Currently in dentistry, scientific research has been conducted in the study of dental implants. Being able to optimize dental implants, in all its mechanical and biological components, is the main objective of the research. The purpose of this article was to evaluate the structure and the molecular features of dental implant titanium alloy. Two different internal hexagonal connection systems belonging to FDS76® have been used as sample. Beyond the literature search, fixture and abutment surface through an X-Ray Fluorescence (XRF) method have been analyzed. The surfaces have achieved an excellent level of quality and low impurity, according to commercial pure titanium alloy. This information will surely bring useful information to evaluate the quality of this type of alloy and possibly improve its features.

Background The infraorbital foramen (IOF) is an essential anatomical structure for maxillary block anesthesia in dental practice and maxillofacial surgery. The literature also reports the importance of knowing the morphometric characteristics of the IOF because it can be damaged. The aim of our study is to determine anthropometric characteristics of infra orbital foramen in Senegalese population in relationship with the sex. Material and methods A total of 87 CT-Scan of patients were included in our sample and data collected from patient's cerebral CT-Scan. The transverse and vertical diameters of the IOF and its distance to the nearest point of the infraorbital margin, lateral nasal border and lower border of the maxillary were measured and the shape determined. Results 87 CT-scan of patients were be analyzed. This research showed that the transverse diameter of the left IOF in female was 5.05 mm ± 0.205 and 4.97 mm ± 0.22 in male. The mean vertical diameter of the right foramen found in our study was 5.30 mm ± 0.191 for the female subject and 5.28 mm ± 0.137 for the men foramen was located at 46% on the line above the 2nd premolar. The right IOF was round in 52% of subjects. An accessory IOF was found in 20% of female subjects. Conclusions Knowledge of the precise anatomical location of IOF is important in surgical procedures and reduce the relative risks during clinical procedures.This study showed many differences in the location of the IOF with caucasians measurments done.

Ahead of Print article withdrawn by publisher.

Purpose The aim of this review was to assess efficacy and acceptance of aesthetic Zirconia Crowns (ZCs) compared to the traditionally employed Stainless Steel Crowns (SSCs) for primary teeth restoration. Methods A comprehensive literature search was completed for the relevant keywords in Scopus and Medline databases. Resulting article abstracts and full texts were screened to determine final inclusion. Results Eighteen articles were included from the initial search. There is still little evidence to support the use of one type of crowns over another for primary teeth, in particularly for ZCs, lately introduced in paediatric restoration. The gold standard for restoring decayed primary teeth is still represented by SSCs, despite the growing importance of the aesthetic issue related to their use. Aesthetic ZCs resulted in having adequate properties to be employed for the treatment of decayed primary teeth, such as mechanical resistance, limited plaque adhesion, wear behaviour and natural appearance. Conclusions There is still a paucity of literature clinically evaluating the efficacy of ZCs for primary teeth restoration, but they can be considered a promising alternative to SSCs. This field of research has to be more deeply explored to improve dental care in children affected by early childhood caries.

Background Most nasal cutaneous malignancies occur on the caudal third of the nose. Commonly, following resective surgery, the surgeon is requested to reconstruct the ala. Small skin defects of the nose may be left healing by secondary intention, although this may sometimes create an unpleasant scar. In the present paper we describe a 1-step reconstruction of the distal area of nasal ala, alar facial sulcus and cheek, with a segmented melolabial interpolated flap. Methods A 59-year-old man was operated for basal cell carcinoma involving the distal area of nasal ala and alar-cheek sulcus. The reconstruction was performed in 1-stage with a segmented melolabial interpolated flap used to reconstruct the anatomical missing subunits. Results Tumor-free margin was larger than the infiltrating region. No postoperative complications were observed. Conclusions The melolabial flap is a suitable option for the reconstruction of the nose, although the reconstruction of nasal ala is usually performed in 2-steps: the first one is performed to transfer the tissue and close the defect; the second, is performed to reshape the convexity of the ala and the concavity of the alar facial sulcus. In the present case, we do not perform a 2-steps reconstruction, we just reshaped the flap to perfectly fit the defect in 1-stage. The flap, supplied by collateral arteries from the facial and angular arteries, could be segmented for a better surgical outcome also during the harvesting stage if multiple anatomical subunits have to be reconstructed, with no need of a second surgical step that could be frustrating for the patient.