OBJECTIVES: To study the clinical effect of the L-shape technique combined with concentrated growth factor on the horizontal bone defects of maxillary anterior teeth. METHODS: Twenty-five implants from 25 patients who underwent single maxillary anterior tooth implantation with simultaneous bone grafting were selected as the study subjects. Based on the bone grafting techniques, the patients were divided into a test group (L-shaped technique with guided bone regeneration combined with concentrated growth factor, 11 cases) and a control group (traditional guided bone regeneration combined with concentrated growth factor, 14 cases). The early discomfort and wound healing conditions in the two groups at two weeks after surgery were compared. The horizontal bone thickness, vertical bone thickness, and grayscale values in the augmentation area were measured immediately postsurgery and six months after surgery. Implant stability, hard tissue resorption within six months, and grayscale values were compared between the two groups. RESULTS: Differences in early discomfort, wound healing, implant stability, and grayscale values between the two groups were not statistically significant (P>0.05). Vertical bone thickness in the test group was significantly better than that in the control group at six months after surgery (P<0.05). The variation in horizontal bone thickness in the test group was significantly higher than that in the control group (P<0.05). CONCLUSIONS The application of the L-shape technique with concentrated growth factor for horizontal bone defects in the anterior maxillary area yielded satisfactory short-term results in terms of bone augmentation, early discomfort, wound healing, and implant stability at six months after surgery.
Humans ; Maxilla/diagnostic imaging* ; Intercellular Signaling Peptides and Proteins/therapeutic use* ; Wound Healing ; Bone Transplantation/methods* ; Dental Implantation, Endosseous/methods* ; Bone Regeneration ; Male ; Female ; Adult ; Dental Implants, Single-Tooth ; Middle Aged

Objective This study aimed to evaluate the clinical outcomes of immediate implantation of single maxil-lary central incisor and explore factors affecting post-implant bone volume.Methods Clinical data and imaging records from pre-surgery,the day of surgery,and 6 months post-surgery of 100 patients(100 implants)with non-salvageable maxillary central incisors who underwent immediate implantation were collected.Bone thickness at the cervical,middle,and apical regions of the implant's labial and palatal sides were measured immediately post-surgery and at 6 months,and bone volume changes were observed.A regression analysis model was used to assess predictive factors for labial and pal-atal bone plate thickness.Results At 6 months post-surgery,the labial bone thicknesses at the cervical,middle,and api-cal regions were 2.35,2.29,and 3.28 mm,respectively,and those of the palatal side were 0.00,2.40,and 6.05 mm,re-spectively.The cervical region had the highest alveolar crest collapse rates,with 32.87%on the labial side and 62.20%on the palatal side.The regression model indicated that factors influencing the thickness of bone at the cervical labial side of the implant included initial bone thickness,the implant center to adjacent tooth center angle,implant diameter,and the type of implant closure(P<0.05).The initial bone thickness on the palatal side was the sole predictor for bone thickness on the palatal side(P<0.05).Conclusion Immediate implantation of single maxillary central incisors yields effective clinical results.The thickness of new bone around the implant is influenced by multiple factors.A comprehensive consideration of these factors in the plan-ning of immediate implantation is necessary to achieve optimal therapeutic outcomes.

Maintaining the stemness of the transplanted stem cell spheroids in an inflammatory microenvironment is challenging but important in regenerative medicine. Direct delivery of stem cells to repair periodontal defects may yield suboptimal effects due to the complexity of the periodontal inflammatory environment. Herein, stem cell spheroid is encapsulated by interfacial assembly of metal-phenolic network (MPN) nanofilm to form a stem cell microsphere capsule. Specifically, periodontal ligament stem cells (PDLSCs) spheroid was coated with Fe^III/tannic acid coordination network to obtain spheroid@[Fe^III-TA] microcapsules. The formed biodegradable MPN biointerface acted as a cytoprotective barrier and exhibited antioxidative, antibacterial and anti-inflammatory activities, effectively remodeling the inflammatory microenvironment and maintaining the stemness of PDLSCs. The stem cell microencapsulation proposed in this study can be applied to multiple stem cells with various functional metal ion/polyphenol coordination, providing a simple yet efficient delivery strategy for stem cell stemness maintenance in an inflammatory environment toward a better therapeutic outcome.
Anti-Bacterial Agents/pharmacology* ; Capsules/pharmacology* ; Cell Differentiation ; Cell Encapsulation ; Cells, Cultured ; Ferric Compounds/pharmacology* ; Osteogenesis/physiology* ; Periodontal Ligament ; Polyphenols/pharmacology* ; Stem Cells ; Tannins/pharmacology*

Objective To detect the total colon transit time (CTT) and segmental CTT of patients with chronic constipation and explore the clinical significance. Methods Colon transit study and defecography(DFG) were performed on 60 patients with chronic constipation. These patients were divided into 3 groups: group Ⅰ, 19 patients with slow transit constipation based on low stool frequency and normal DFG, group Ⅱ, 22 patients with rectal intussusception diagnosed by DFG and group Ⅲ, 19 patients with external rectal prolapse or puborectal muscle syndrome based on the results of DFG. Results Group Ⅰ showed increased total CTT (mean, 96.2 h) and segmental CTT, right colon, 35.3 h (36.7%), left colon, 30.8 h (32.0%), rectosigmoid, 30.1 h (31.3%). Group Ⅱ had normal mean total CTT (57.8 h) and a relative decrease in rectosigmoid CTT [mean, 13.8 h (23.9%)]. In group Ⅲ, patients showed elevated total CTT(mean, 175.1 h) and rectosigmoidal CTT [mean, 115.8 h(66.1%)]. There were significant differences in mean total CTT and rectosigmoidal CTT among the 3 groups ( P

Objective To study the morphologic and structural changes of the pelvic floor and corresponding visceras in patients with outlet obstructive constipation (OOC). Methods We used simultaneous pelvicography and colpocystodefecography (PCCD), including pelvicography, vaginal opacification, voiding cystography and defecography in 38 patients with OCC and 12 healthy volunteers. Anorectal angle, the level of perineum, and bladder were measured. Results Internal rectal prolapse (IRP) in 37 cases, rectocele (RC) in 5 cases and spastic pelvic floor syndrome (SPFS) in 5 cases were diagnosed by PCCD. While common physical examination alone detected only 12 cases, 4 RC cases and one SPFS case, which were confirmed by PCCD. Moreover, PCCD found 9 cases of pelvic floor hernia or peritoneoceles, 6 cases of cystoceles, 3 cases of descending perineum syndromes, and 10 cases of uterine prolapses. Compared with controls, OOC patients had a larger anorectal angle during defecation, abnormal descending of perineum at rest and defecation, and a deep pouch of Douglas during defecation. Some patients with urinary system symptoms have an abnormal descent of bladder during rest and defecation. Conclusion PCCD has a higher detection rate than common physical examination in diagnosing IRP and RC, and provides information for diagnosis of pelvic floor hernia or peritoneocele, cystocele or uterine prolapse. PCCD helps in the selection of a proper surgical procedure for OOC patients.

Objective To evaluate operative effect on internal rectal prolapse. Methods Sixty-two patients with internal rectal prolapse who underwent operation were studied by retrospectively analyzing the treatment and followed up results. Results The total success rate of surgical treatment for internal rectal prolapse is 73%. The rate of symptoms improvement as difficulty in defecation,anal aboating, incomplete defecation,asistation with fingers,and defecating dependent on laxatives were 77%,80%,71%,86%,97% respectively. Conclusion the operative indications of internal rectal prolapse should be strictly controlled. Only those who received standard conservative treatment and failed to improve should be a candidate for surgery.