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At least 631 records · Page 35Linked to original sources
PubMed1993

In vivo measurements of maximal occlusal force and minimal pressure threshold on overdentures supported by implants or natural roots: a comparative study, Part 1.

Numerous investigations give evidence of improvement of masticatory performance when edentulous patients have had implants placed. A comparative study was carried out to investigate the oral function and tactile sensibility of patients restored with implant-supported overdentures. Twenty-six patients with ITI implants and 18 patients with natural-tooth roots were selected. The minimal pressure threshold perceived in vertical and horizontal directions was registered with dynamometers. Maximal occlusal force was recorded with a miniature bite recorder placed between each pair of antagonistic teeth on both jaw sides separately. All measurements were repeated three times and the average was calculated. The records of minimal perceived pressure revealed a significantly higher threshold (factor 100) for the implant group. In both test groups, values registered in the vertical direction were slightly increased. A tendency for test subjects with implants to reach higher maximal occlusal force was observed, but not at a statistically significant level. In both test groups, the average maximum was found on the second premolar. The minimal pressure threshold seems to depend on the presence of receptors in the periodontal ligament. The records of maximal occlusal force, which were similar in both test groups, lead to the assumption that the limitation in maximal occlusal capacity of overdenture wearers is multifactorial and does not depend on the presence of a periodontal ligament.

Aged↗
PubMed2006

Composite resin root coping with a keeper for magnetic attachment for replacing the missing coronal portion of a removable partial denture abutment.

Numerous methods for replacing missing removable partial denture abutments have been introduced, however, most of them are time consuming and require several visits to complete the procedure. Since magnetic attachments can provide support and bracing as well as retention for overdenture abutments, the remaining tooth root structure can be used to support the coping with the keeper. Through the use of composite resin and adhesive material, improved retention of the keeper to the root may be achieved, along with improved esthetics. This article describes a method for replacing the missing abutment of a removable partial denture with a magnetic attachment, and a composite resin coping with a keeper.

Composite Resins↗
PubMed1994

Comparison of the antibacterial effects on subgingival microflora of two different resorbable base materials containing doxycycline.

A study was conducted to evaluate the effects of local drug delivery on subgingival plaque flora using hydroxypropylmethylcellulose (HPMC) and methylcellulose (MC) base material containing 40% doxycycline (DOXY). Eleven patients who had at least four pockets exceeding 5 mm in depth associated with a single rooted tooth were selected from volunteers after an initial examination. Two of the pockets were chosen at random for insertion of the HPMC and MC strips twice a week for 6 w. One pocket received no treatment, and the other was debrided and root-planed only. Baseline and follow-up measurements at 0, 1, 3, 6, and 10w included probing depth, gingival shrinkage, bleeding on probing and crevicular fluid flow. Subgingival bacterial samples were also taken for dark-field microscopy. In vitro drug release from the HPMC strips was greater than that from MC. Significant improvements in many clinical parameters occurred in the pockets treated with HPMC or MC strips, or mechanical debridement. There was a marked decrease in the relative proportions of motile organisms during and after treatment.

Adult↗
PubMed2005

[Three-dimensional finite element analysis of the biomechanical effects of multiloop edgewise archwire (MEAW)].

This study is designed to theoretically evaluate the treatment effects of MEAW with tip back bends on the mandible dentition when used as a finishing archwire without elastic and with long class III elastics respectively, and to compare them with those of stainless-steel wire and shape-memory wire. The finite element analysis (FEA) method was adopted and the findings were as follows: (1) In the case of no elastics, the MEAW rotates the second premolar, the first molar and the second molar distally while rotating other teeth mesially, and depresses anterior teeth. However, the stainless-steel wire and the shape-memory wire rotate molars distally while rotating other teeth mesially. Furthermore, they extrude anterior teeth and depress posterior teeth. (2) The MEAW with tip back bends and long class III elastics inclines and rotates posterior teeth more distally than the MEAW with only tip back bends does. In the case of tip back bends and long class III elastics loaded together, the shape-memory wire inclines teeth in greater strength as compared with the stainless-steel wire. (3) The stress level of tooth root is the lowest with MEAW, the highest with stainless-steel wire, and is middle with the shape-memory wire. From these results, it is suggested that: (1) The MEAW therapy technique is effective for leveling the curve of Spee and regulating tooth respectively. (2) The MEAW therapy technique can transfer therapy force efficiently. (3) The MEAW is considered to be suitable for treating openbite malocclusion to make the posterior teeth upright because it effectively rotates teeth distally through the force of posterior bends and long class III elastics. (4) The loaded force on the teeth is more soft and permanent in the MEAW than in the stainless-steel wire and the shape-memory wire.

Biomechanical Phenomena↗
PubMed1989

[Root fracture and tooth luxation. Endo-orthodontic technic after 15 years].

The authors described a personal treatment method for the traumatic root fractures in the permanent incisors, and the review of their results after 15 years. The method consists in the good immobilisation and fixation of the injured teeth, with orthodontic bands and brackets and arch wire. They put this orthodontic contention for one-two months, and after x-ray control and pulp vitality checks, removed it. They presented also the use of the same technique in the luxations of permanent incisors, and compared the results. In the root fractures the authors obtain good long distance results, such as pulp vitality, good health, calcified tissue in the fracture zone, good stability of the tooth. Otherwise in the incisors luxations they frequently founded pulp necrosis, and root resorption in the long distance controls.

Child↗
PubMed2005

Subgingival topical doxycycline versus mechanical debridement for supportive periodontal therapy: a single blind randomized controlled two-center study.

PURPOSE: To evaluate the clinical effects of topical subgingival application of a doxycycline gel compared to conventional mechanical debridement in supportive periodontal therapy. METHODS: 37 patients with residual or recurring periodontitis after systematic periodontal treatment at two centers (Heidelberg, Frankfurt) participated in this study. They had to exhibit at least one single-rooted tooth with either a probing depth (PPD) = 5 mm and bleeding-on-probing (BOP) or with PPD > or = 6 mm. The patients were randomly assigned to one of the two different treatment regimes: DOXY (exclusively subgingival application of a 14% doxycycline gel) or SRP (scaling and root planing with a sonic scaler). Clinical examinations (plaque index [P1I], PPD, vertical relative attachment level [RAL-V], gingival index [GI]) were performed before, 3, and 6 months after therapy. RESULTS: In 37 patients (19 female), aged 30-76 years with a total of 168 teeth were treated (DOXY: 79; SRP: 89). Six months after therapy, both groups exhibited statistically significant (P< 0.001) reductions of PPD (DOXY: -1.43 +/- 0.22 mm; SRP: -1.14 +/- 0.18 mm) and gains of RAL-V (DOXY: 0.79 +/- 0.22 mm; SRP: 0.72 +/- 0.19 mm). Multilevel regression analyses, considering the therapy of different numbers of teeth in different patients, failed to show statistically significant differences concerning PPD reduction and RAL-V gain between both therapies (DOXY/SRP). For both therapies, PPD reduction was significantly better in deeper pockets (PPD > or = 7 mm) than in shallow pockets (PPD: 5-6 mm).

Adult↗
PubMed1998

Eruption of premolars subsequent to autotransplantation. A longitudinal radiographic study.

One-hundred-and-eighteen premolars transplanted at a stage with 3/4 to 4/4 root development with an open apical foramen were followed using a standardized clinical and radiographic technique for signs of periodontal ligament healing, root development, and tooth eruption. Root growth was unimpeded in 26 per cent, impaired in 55 per cent, and arrested in 19 per cent. Eruption of transplants occurred at the time of periodontal and alveolar healing, and before any significant root growth. Furthermore, autotransplanted premolars created growth of the alveolar process along with the eruption process.

Adolescent↗
PubMed2003

[Effects of dentine phosphoprotein on remineralization of demineralized dentine].

OBJECTIVE: To investigate the relationship between dentine phosphoprotein (DPP) and remineralization of demineralized dentine. METHODS: (1) Soluble DPP was extracted with 1 mol/L NaCl from demineralized dentine and was evaluated. (2) Soluble DPP was removed with 0.1 mol/L NaCl or was not removed from demineralized dentine sections in human tooth roots. Then all sections were subjected to remineralization treatment, and remineralization degrees were compared by atomic absorption spectrum, SEM and microradiography. RESULTS: (1) Soluble DPP was extracted with 1 mol/L NaCl. (2) Removal of soluble DPP resulted in significantly lower calcium concentration in remineralization solution (P < 0.01), less mean light-absorbed value in demineralized dentin sections by microradiography (P < 0.01). CONCLUSIONS: Soluble DPP may have an inhibiting effect on remineralization of demineralized dentine, this study suggests that the remove of soluble DPP from root caries lesions may enhance their remineralization potential.

Adolescent↗
PubMed1980

Effect of extraction in the late mixed dentition on the eruption of the first premolar in Macaca nemestrina.

The effect of deciduous tooth extraction in the late mixed dentition on the eruption of succedaneous teeth was studied in ten Macaca nemestrina. Nineteen deciduous teeth were extracted: nine maxillary and ten mandibular left deciduous first molars. Regardless of sex, arch, chronologic or dental age, all first premolars on the experimental side erupted before those on the control side and this pattern was statistically significant. Extraction of deciduous molars in the late mixed dentition is seen to accelerate eruption of first premolars in Macaca nemestrina. This could be the result of eliminating the need for deciduous tooth root resorption during the normal process of eruption.

Age Factors↗
PubMed2001

[Microcirculation in the periodontal tissues].

There is the microcirculation in the periodontal tissues with one characteristic vessel network with the periodontal membrane and the gingival. Two levels blood vessels network in the periodontal membrane surrounds the tooth root. The inner and outer marginal epithelium has two levels blood vessels network in the gingival, and the blood vessels network under the epithelium sends in a loop of capillary toward the epithelium. The blood vessels network of the periodontal tissues is subjugated to a injury of extraction of a tooth, orthodontic tooth movement and implant. And almost overcome it after the 30th day when received on injury.

English Abstract↗
PubMed1986

Current understanding of the aetiology and progression of periodontal disease.

There is overwhelming evidence that bacteria cause periodontitis and that they do so by extending apically along the surfaces of the tooth roots and creating pockets. A very complex mixture of microbial species, mostly although not exclusively gram-negative, anaerobic, and motile, is involved. Infection probably occurs in a progressive and sequential manner. The bacteria involved include various species of Bacteroides, Actinobacillus, Eikenella, Fusobacterium, Capnocytophaga, and Eubacterium. Local oral conditions such as tooth position play an aetiologic role by affecting plaque accumulation and retention. Host defence factors, particularly the phagocytic cells and the immune system, play a determinative role in the aetiology by monitoring, controlling, and regulating microbial colonization and infection. These diseases begin as an acute inflammation of the marginal gingiva, and they progress through orderly stages to the formation of a gingival pocket. Transition from gingivitis to periodontitis is not well-understood, but it probably involves colonization by additional microbial species or invasion of the periodontal tissue by species already present. Progression of periodontal destruction is episodic, possibly as a consequence of successful host defence. In most patients, periodontal destruction occurs more infrequently than previously suspected. In both treated and untreated patients, a small subgroup accounts for most of the disease activity. The most important problem we now face is to develop diagnostic methods to identify individuals in this subgroup and devise ways to prevent and control their diseases.

Bacteria↗
PubMedDate not supplied

Using 45S5 bioglass cones as endosseous ridge maintenance implants to prevent alveolar ridge resorption: a 5-year evaluation.

Bioglass cones acting as space fillers after removal of tooth roots delay the resorption of alveolar ridges. In 1987, 242 implants in 29 patients with a mean postimplantation interval of 19.9 months were reported by the authors. Bioglass cones had been fitted snugly at least 2 mm below the alveolar crest, and dentures were placed no sooner than 6 weeks following tooth removal; 2.9% had been lost and 3.7% developed dehiscences. The present report on 168 implants in 20 recalled patients (mean postimplantation interval of 63.2 months) revealed a loss of 14.3% of the implants and 7.7% of the implants requiring recontouring. Literature indicates highest survival rates for implants in the anterior mandible; however, the present data demonstrate a statistically significant retention rate in the anterior maxilla. With this high rate of Bioglass cone retention (85.7%) after 5 years, their placement into fresh sockets to maintain the alveolar ridge is recommended.

Adult↗
PubMed2006

Benign cementoblastoma: a case report.

In the past the benign cementoblastoma was recognized in the World Health Organization's classification of odontogenic tumours as one of the cementoma neoplasias. Recently the benign cementoblastoma is included into Mesenchyme and/or odontogenic ectomesenchyme, with or without odontogenic epithelium odontogenic tumours. Benign cementoblastoma has characteristic radiologic and microscopic features and it appears to be fused to the tooth roots. Symptoms may be totally absent, and when they do occur, pain and swelling are frequent findings. The final diagnosis is usually made histopathologically, but the clinical diagnosis is comparatively easy if it is examined radiographically. The tumour has unlimited growth potential. Most frequently tends to be associated with an erupted permanent tooth, most often the first molar: rarely has an association with an impacted or partial impacted tooth been reported. This case represents a case of benign cementoblastoma associated with a partially impacted mandibular third molar.

Humans↗
PubMed1997

Restoration of disturbed tooth eruption in osteopetrotic (op/op) mice by injection of macrophage colony-stimulating factor.

Osteopetrotic (op/op) mice show severe osteosclerosis caused by an inherited deficiency of osteoclast and resultant failure of tooth eruption, which can be cured by the injection of macrophage colony-stimulating factor (M-CSF). The present study revealed that consecutive injections of M-CSF in these mutant mice brought about a recovery of bone resorption resulting in the resumption of growth of tooth root and periodontal ligament. Bone resorption at the inner surface of bony crypts was noted on the 5th day after the start of M-CSF injections. This activity was reduced with the progress of root and periodontal ligament formation, being confined to the basal and crestal portion of bony crypts by the 15th day of the experiment. Second molars emerged into the oral cavity on the 15th day, but no eruption of first molars was observed until the 20th day. Throughout the experiment, first molars exhibited appreciable root deformity, which was less severe in second molars. Delayed eruption of first molars was thought to be related to the severity of the disturbance of root formation.

Age Factors↗
PubMed1999

Diagnosis and surgical treatment of periapical infection of the third mandibular molar in five horses.

Diagnosis and treatment of periapical infection of the third mandibular molar in 5 horses was assessed. In 4 of 5 horses, there was a recent history of dental work performed. Diagnosis required multiple imaging techniques. Radiography revealed evidence of periapical bone lysis or tooth root lysis of the third mandibular molar in 3 of 5 horses. Sonographic examination was effective in identifying abscesses within the masseter muscle and defects of the lateral cortex of the mandible in 4 of 5 horses. Nuclear scintigraphy was diagnostic in 1 of 2 horses examined. All horses were treated by repulsion of the affected tooth. The surgical approach involved elevating the masseter muscle from the caudal portion of the mandible. This approach provided excellent access to the affected tooth with minimal postoperative complications. All incisions healed with good cosmetic results.

Animals↗
PubMedDate not supplied

Periapical curettage: an alternative surgical approach to infected mandibular cheek teeth in horses.

OBJECTIVE: To evaluate an alternative surgical method for treating periapical infection of the mandibular cheek teeth of horses. DESIGN: Retrospective study. ANIMALS: Eleven horses (3-13 years) with periapical mandibular tooth infection. METHODS: Hospital records (1992-2002) of horses that had periapical curettage for the treatment of mandibular cheek tooth root infection were retrieved. Clinical signs, radiographic, and surgical reports were reviewed. Outcome was obtained by telephone questionnaire for 7 horses and by physical examination in 2. RESULTS: Eleven horses (14 infected mandibular molariform teeth) had periapical curettage. Two horses were lost to follow-up. Mean follow-up was 41 months; 2 horses had subsequent tooth repulsion, 7 (78%) horses healed completely although 2 horses still had some local mandibular swelling. CONCLUSION: Periapical curettage, which allows alveolar drainage, appears to be a viable treatment option for periapical infections of equine mandibular cheek teeth. CLINICAL RELEVANCE: Periapical curettage can be performed simply, without expensive imaging or surgical equipment, and thus is useful for both referral and first opinion practice.

Animals↗
PubMed1989

Eleven-year study of hydroxyapatite implants.

An 11-year clinical research study was conducted with both unloaded bulk hydroxyapatite implants and loaded hydroxyapatite-coated titanium implants. A total of 102 submerged bulk hydroxyapatite implants were placed after extraction of teeth to maintain the volume of the residual alveolar ridge by their physical presence. All 21 implants under fixed partial dentures and 51 of 81 implants under lower complete dentures remained submucosal. A total of 71 hydroxyapatite-coated titanium implants were connected with permucosal superstructures by use of a two-stage method. Modifications in design and in implantation technique were required. This long-term research indicates that cylindrical hydroxyapatite implants are reliable devices as natural tooth root substitutes that bond directly to bone instead of simply being osseointegrated.

Dental Abutments↗