1,721,017 research outputs found
Impact of Concave/Convergent vs Parallel/ Divergent Implant Transmucosal Profiles on Hard and Soft Peri-implant Tissues: A Systematic Review with Meta-Analyses
No full textPurpose: To systematically review the literature comparing marginal bone loss (MBL) and pink esthetic scores of implants with convergent or concave transmucosal profiles vs divergent or parallel profiles. Materials and Methods: A PICO question was defined, and an electronic search was carried out in the MEDLINE/PubMed and Cochrane Oral Health Group databases. Studies documenting type of transmucosal profile (either tissue-level profiles or abutments) and soft and/or hard tissue outcomes of implants were considered eligible. Studies were selected on the basis of the inclusion criteria and quality assessments. A meta-analysis with subgroup analyses was performed. Results: Five papers fulfilled the inclusion criteria, and four were eligible for meta-analysis. Significantly less MBL was found in concave/convergent groups, with a mean difference of 0.772 (95% confidence interval [CI]: 0.450 to 1.095; P < .001). In the subgroup analyses for platform-switching and platform-matching connections, a significant effect in favor of concave/convergent was detected, with a standardized difference in means of 1.135 (95% CI: 0.688 to 1.583, P < .001) when platform switching was considered. No significant effects were found for platform-matching connections. Conclusion: Within the limitations of this review, it is suggested that concave/convergent implant transmucosal profiles result in less MBL. No statistically significant results were obtained for soft tissue-related outcomes or for the platform-matching connection subgroup
Effect of a new nano-hydroxyapatite dentifrice on tooth sensitivity: A preliminary randomized clinical trial.
No full textLabial frena and frenectomy: Clinica consideration [Frenuli labiali e frenulectomie: considerazioni cliniche]
No full textAbstract
Frenectomy is one of the most debated topic in dentistry. Its importance is due to the occurrence of many clinical conditions where a frenum may be considered pathological. The aim of this literature review is to establish clinical indications of frenectomy according to aesthetical, functional, orthodontic and periodontal evaluations. The Authors found that many studies showed sucb different conclusions so that it was impossible to draw specific guide lines for frenectomy. The Authors conclude that literature data can help clinicians in choosing treatment but any single case must be individually evaluated
Longitudinal Clinical Evaluation Of Bonded Composite Inlays: A Three-Year Study
No full textOBJECTIVE:
The aims of this prospective clinical study were (1) to evaluate the clinical performance of Signum composite inlays over a 3-year period; (2) to investigate the clinical efficacy of composite inlays in premolars versus molars; and (3) to evaluate differences between 1- or 2-surface inlays and multisurface inlays.
METHOD AND MATERIALS:
One hundred thirteen composite inlays were placed in 30 patients by a clinician. All the inlays were made by the same laboratory technician using only one composite material (Signum, Heraeus Kulzer). All the restorations were bonded with a 3-step bonding system and a composite luting cement. The restorations were assessed after placement by a clinician who had not been involved with the placement of the restorations, in accordance with the modified US Public Health Service criteria.
RESULTS:
Three of the 113 experimental restorations had to be replaced; the total failure rate was 2.6% after 3 years. At baseline, 88.5% to 100% of the inlay restorations were rated as excellent (Alpha). Statistically significant (P < .05) differences were observed during the study for surface roughness, anatomic form at the margin, marginal integrity, and inlay integrity. The comparison of the clinical outcome of inlays in premolars versus molars and with 1 or 2 surfaces versus multisurfaces showed no significant differences, except for the parameters anatomic form at the margin and marginal integrity.
CONCLUSION:
Composite inlays demonstrated a very high success rate (97.4%) after 3 years. Neither the size of the restorations nor the tooth type significantly affected the clinical outcome of the restorations
Minimally invasive prosthetic procedures in the rehabilitation of a bulimic patient affected by dental erosion
No full textThe population affected by dental erosion due to bulimia is generally very young. This population group has a high aesthetic requirement; the dentition in these patients is severely damaged, especially in the anterior maxillary quadrant. In terms of treatment, it is still controversial whether an adhesive rehabilitation is preferable to a longer-lasting but more aggressive conventional treatment, such as full-crown coverage of the majority of teeth. This case report describes the prosthetic rehabilitation of a young female patient previously affected by bulimia nervosa and presenting erosion of the maxillary teeth. The prosthetic rehabilitation was performed through indirect adhesive restorations of the anterior teeth and direct restorations of the posterior teeth. A clinical follow-up after 4 years showed that the occlusion remained satisfactorily restored. Posterior direct composite resin restorations and anterior indirect adhesive composite restorations proved to be an effective time and money-saving procedure to rehabilitate patients affected by dental erosion. Adhesive rehabilitation provides a functional and good aesthetic result while preserving tooth structure
A new bleaching technique with nano-hydroxyapatite and 6% Hydrogen peroxide
No full textIntroduction: Tooth sensitivity during whitening has been associated with microscopic surface defects and sub-surface pores in enamel. It has been theorized that these defects allow rapid ingress of the whitening agent to the pulp and this results in sensitivity. A product that encourages repair of these microscopic defects can reduce sensitivity. Laboratory studies have shown these microscopic pores can be repaired using a paste containing nano-sized hydroxyapatite (n-HAP).
This study evaluated color change, stability, and tooth sensitivity in patients submitted to a new bleaching technique with Nano-Hap and 6% Hydrogen peroxide, whereas the control group used a placebo.
Material and methods: 6 patients with intact natural maxillary incisors, free of restorations with a initial shade of A2 or darker according to a value-oriented Vita shade Guide (Vitapan Classical), which had not been subjected to any previous tooth bleaching were included in the study.
A spectrophotometer and a Vita shade guide (Vitapan Classical) were used to measure color change before the treatment and after 24 h, 1 week, and one month. A VAS questionnaire was used to evaluate tooth sensitivity before the treatment and following the treatment at 24 h, 1 week, and one month. At each color evaluation an investigator and a trained research assistant evaluated tooth color. Prior to the study research assistants and investigators underwent calibration exercises. For statistical analysis the tabs of the shade were arranged from B1 to C4 from the lightest to the darkest shade. The bleaching material was used according to the manufacturer instructions, Prevdent. (Baroniestraat, Amsterdam, The Netherlands)
Statistical Analysis: The change in VAS score before and after the treatment and at any following time point was compared using a Mann–Whitney rank sum test. The percentage of participants experiencing sensitivity before and after the treatment and at any time point was calculated using chi square tests. The color change was assessed before and after the treatment and at any time point using t-test. P-value of 0.05 was considered significant for all analyses.
Results and Discussion: The color change measures according to both spectrophotometer and Vita shade guide indicated that positive whitening took place. The teeth were brighter immediately after bleaching and 4 weeks following the end of bleaching. Using Vita shade guide, 4 weeks following the end of bleaching the mean tab changes from baseline were 1.5. There was no significant difference between the spectrophotometer and Vita shade guide for color change measurement before and after the treatment and at any time point. There was no significant difference between the VAS score before and after the treatment and at any time point.
Conclusions: Within the limits of the study it can be concluded that use of this new bleaching product containing nano-sized hydroxyapatite (n-HAP) and 6% Hydrogen peroxide is effective as tooth withening technique and does not increase tooth sensitivity during and after the bleaching treatment
Dental erosion treatment: Immediate provisionalization with aesthetic and functional rehabilitation. A case report
No full textOBJECTIVES. Dental erosion and wear are more and more diagnosed, especially in young patients. Occlusal Vertical Dimension (OVD) reduction is the extreme consequence of these conditions. The aesthetic and functional rehabilitation is of utter importance, with the use of minimally invasive and easy-to-do protocols ensuring stable results over time. MATERIALS AND METHODS. A case of OVD loss with anterior open bite treated with a removable provisional prosthesis and adhesive final prosthesis is reported. RESULTS. One year from the prosthetic fixed rehabilitation, the patient's aesthetics and function appear to be stable. CONCLUSIONS. The removable device used in this case allowed to better plan chair-side times and to maintain aesthetics and function during the provisional phase
Leader genes: a data mining approach for molecular genomics
No full textAbstract
A very large amount of genes is involved in each different cellular process, but only a few of them are supposed to play a central role. The leader gene approach is a data mining method, which may allow the identification of genes with potential highest importance in a given cellular process. We plan to use this method to shed new lights on molecular mechanisms of some complex oral diseases
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